An algorithm for simulation of achemical transport equation in an aquifer fin...Alexander Decker
This document describes an algorithm developed to simulate chemical transport in an aquifer. The algorithm discretizes and solves the governing chemical transport and groundwater flow equations using an integrated finite difference method. The algorithm is implemented in a computer code to generate predictions about chemical fate and transport processes in the aquifer. Simulation results demonstrate how transport processes, decay, and hydraulic properties influence chemical concentration levels over time.
Improving the Reliability of Synthetic S-Wave Extraction Using Biot-Gassman F...IJERA Editor
Usage of Castagna’s relation by mean the P-wave log directly in estimation of the S-wave log gives a large error
to the original S-wave log so that the result is not reliable for further analysis. This paper offers new method for
S-wave log estimation based Castagna’s relation which is combined with fluid replacement modeling method
based on Biot-Gassman substitution and the use of petro physical data as input. The S-wave log result of the
offered estimation method has a small error to the original S-wave log so that more reliable and accurate for
further analysis. The offered method could be used for S-wave log estimation in various litology such as sand,
limestone, dolomite and shale. The S-wave log result of the offered estimation method has successfully used for
cross plot analysis of Vp/Vs ratio as function of acoustic impedance and Gamma Ray for delineation of
sandstone bearing hydrocarbon from two different field.
Residence time distribution studies in flow through tubular electrochemical r...IJERD Editor
International Journal of Engineering Research and Development is an international premier peer reviewed open access engineering and technology journal promoting the discovery, innovation, advancement and dissemination of basic and transitional knowledge in engineering, technology and related disciplines.
The document presents an analytical solution for modeling groundwater flow in a multi-aquifer system considering vertical flow in the wellbore and well loss due to friction. It extends a previous single aquifer solution to consider two interconnected aquifers separated by an aquiclude. Simultaneous equations are formulated using Bernoulli's theorem under hydrostatic conditions to compute water flow between the two aquifers and well for both steady and unsteady well water level conditions. The solution technique aims to more scientifically and economically characterize parameters in multi-aquifer systems compared to previous approaches that treated interconnected aquifers as isolated.
This document summarizes a numerical study of the structure and thermodynamics of colloidal suspensions using the variational method and integral equation theory. The interactions between colloid particles are modeled using either a Yukawa or Sogami potential. Results from the integral equation theory using a Sogami potential are found to be in good agreement with Monte Carlo simulation results and experimental data. The variational method and integral equation theory are used to calculate structural properties like the pair correlation function and thermodynamic properties.
This paper presents a rock physics model to calculate synthetic porosity logs as functions of pressure and gas saturation. The model uses the Krief and Gassmann equations to calculate compressional and shear velocities from which density and neutron responses are derived. Pseudo logs are generated for varying gas/water saturations and pressures. The model incorporates matrix, shale, and fluid properties. Changes in synthetic seismic data with depleting reservoir pressure are also estimated using changes in velocity and density with pressure. The modeling has applications for reservoir characterization, stimulation design, and sand control.
Basics of Contaminant Transport in Aquifers (Lecture)Amro Elfeki
This is a basic lecture on contaminant transport in aquifers. It covers various aspects. Types of transport in aquifers. Reactive and non-reactive, governing equations of solute transport. Method of solutions and simulations.
1) The document analytically solves the nonisothermal Buckley-Leverett problem for two-phase immiscible flow in porous media including a tracer component and temperature effects.
2) Mass balances for the fluids and tracer and a convective heat balance equation are formulated and solved using the method of characteristics.
3) The solutions can be used to analyze pressure transients, interpret formation testing, calculate temperature front propagation during waterflooding, and benchmark simulators.
An algorithm for simulation of achemical transport equation in an aquifer fin...Alexander Decker
This document describes an algorithm developed to simulate chemical transport in an aquifer. The algorithm discretizes and solves the governing chemical transport and groundwater flow equations using an integrated finite difference method. The algorithm is implemented in a computer code to generate predictions about chemical fate and transport processes in the aquifer. Simulation results demonstrate how transport processes, decay, and hydraulic properties influence chemical concentration levels over time.
Improving the Reliability of Synthetic S-Wave Extraction Using Biot-Gassman F...IJERA Editor
Usage of Castagna’s relation by mean the P-wave log directly in estimation of the S-wave log gives a large error
to the original S-wave log so that the result is not reliable for further analysis. This paper offers new method for
S-wave log estimation based Castagna’s relation which is combined with fluid replacement modeling method
based on Biot-Gassman substitution and the use of petro physical data as input. The S-wave log result of the
offered estimation method has a small error to the original S-wave log so that more reliable and accurate for
further analysis. The offered method could be used for S-wave log estimation in various litology such as sand,
limestone, dolomite and shale. The S-wave log result of the offered estimation method has successfully used for
cross plot analysis of Vp/Vs ratio as function of acoustic impedance and Gamma Ray for delineation of
sandstone bearing hydrocarbon from two different field.
Residence time distribution studies in flow through tubular electrochemical r...IJERD Editor
International Journal of Engineering Research and Development is an international premier peer reviewed open access engineering and technology journal promoting the discovery, innovation, advancement and dissemination of basic and transitional knowledge in engineering, technology and related disciplines.
The document presents an analytical solution for modeling groundwater flow in a multi-aquifer system considering vertical flow in the wellbore and well loss due to friction. It extends a previous single aquifer solution to consider two interconnected aquifers separated by an aquiclude. Simultaneous equations are formulated using Bernoulli's theorem under hydrostatic conditions to compute water flow between the two aquifers and well for both steady and unsteady well water level conditions. The solution technique aims to more scientifically and economically characterize parameters in multi-aquifer systems compared to previous approaches that treated interconnected aquifers as isolated.
This document summarizes a numerical study of the structure and thermodynamics of colloidal suspensions using the variational method and integral equation theory. The interactions between colloid particles are modeled using either a Yukawa or Sogami potential. Results from the integral equation theory using a Sogami potential are found to be in good agreement with Monte Carlo simulation results and experimental data. The variational method and integral equation theory are used to calculate structural properties like the pair correlation function and thermodynamic properties.
This paper presents a rock physics model to calculate synthetic porosity logs as functions of pressure and gas saturation. The model uses the Krief and Gassmann equations to calculate compressional and shear velocities from which density and neutron responses are derived. Pseudo logs are generated for varying gas/water saturations and pressures. The model incorporates matrix, shale, and fluid properties. Changes in synthetic seismic data with depleting reservoir pressure are also estimated using changes in velocity and density with pressure. The modeling has applications for reservoir characterization, stimulation design, and sand control.
Basics of Contaminant Transport in Aquifers (Lecture)Amro Elfeki
This is a basic lecture on contaminant transport in aquifers. It covers various aspects. Types of transport in aquifers. Reactive and non-reactive, governing equations of solute transport. Method of solutions and simulations.
1) The document analytically solves the nonisothermal Buckley-Leverett problem for two-phase immiscible flow in porous media including a tracer component and temperature effects.
2) Mass balances for the fluids and tracer and a convective heat balance equation are formulated and solved using the method of characteristics.
3) The solutions can be used to analyze pressure transients, interpret formation testing, calculate temperature front propagation during waterflooding, and benchmark simulators.
Pakistan; Adsorption of Heavy Metals In Slow Sand Filters SystemsV9X
1. The document discusses batch adsorption tests conducted to establish adsorption isotherms for heavy metals like copper, chromium, lead, and cadmium onto sand in slow sand filters.
2. The tests aimed to confirm that adsorption was one of the mechanisms for heavy metal removal in slow sand filters. Results showed the adsorption followed both the Langmuir and Freundlich adsorption isotherm models.
3. Maximum adsorption capacities from the Langmuir isotherm were highest for lead, followed by copper, chromium, and cadmium. The Freundlich constant was highest for copper, possibly due to its higher initial concentration. Values exceeded 1, indicating good adsorption of
This document summarizes research on the structure and phase behavior of Cu-Ni nanoalloys. It uses thermodynamic modeling to predict how the phase diagrams and mixing/demixing behavior depend on nanoparticle size, shape, and temperature. The modeling indicates Cu-Ni nanoalloys can form either mixed particles or Janus particles, depending on the synthesis temperature, with nickel preferentially segregating to surfaces. Phase maps are provided to guide experimentalists on controlling particle structure.
Mesoscopic simulation of incompressible fluid flow in porous mediaeSAT Journals
Abstract
Lattice Boltzmann method is used to simulate cavity driven fluid flow in porous media. A square cavity is considered with the top
lid moving with uniform velocity and other sides kept stationary. Simulation is carried out for values of Darcy number ranging
from 10-6 to10-2 at Reynolds number 10 and 100. Influence of Darcy number and Reynolds number is investigated on velocity
profiles and the streamline plots. Half-way bounce back boundary conditions are employed in the numerical simulation. The
numerical code is first verified with the results available in the literature and then used to simulate the Newtonian fluid flow in
porous media. The Darcy number and the Reynolds number were observed to have great influence on the flow properties and the
location of the primary vortex. Simulation was carried out for a 100100 mesh grid and a fine agreement is established theories
in incompressible fluid flow.
Keywords: Lattice Boltzmann method, incompressible flow, porous media
On Similarity of Differential Capacity and Capillary Pressure FractalKhalid Al-Khidir
On Similarity of Differential Capacity and Capillary Pressure Fractal Dimensions for Characterizing Shajara Reservoirs of the Permo-Carboniferous Shajara Formation, Saudi Arabia
ANALYSIS OF POSSIBILITY OF GROWTH OF SEVERAL EPITAXIAL LAYERS SIMULTANEOUSLY ...ijoejournal
We analyzed nonlinear model with varying in space and time coefficients of growth of epitaxial layers
from gas phase in a vertical reactor with account native convection. We formulate several conditions to
increase homogeneity of epitaxial layers with varying of technological process parameters.
This document summarizes a study that used lattice Boltzmann methods to simulate fluid flow through porous media. The study varied the Darcy number from 10-6 to 10-2 and the Reynolds number at 10 and 100 to observe their effects. Velocity profiles and streamline plots were produced from the simulations. Decreasing the Darcy number, which represents permeability, was found to significantly influence the flow properties and location of primary vortices within the porous media. The numerical simulations agreed well with existing theories on incompressible fluid flow.
This document summarizes various models and theories of drug dissolution. It discusses diffusion layer theory, which involves drug dissolving from the solid into a saturated film and then diffusing into the bulk solution. The Noyes-Whitney and Nerst-Brunner equations are presented to model this. Other models covered include zero-order and first-order release kinetics, the Hixson-Crowell cube root model accounting for changing surface area, Danckwert's surface renewal theory, and the interfacial barrier/limited solvation theory involving an energy barrier to dissolution. Theories of dissolution aim to quantitatively understand and interpret in vitro dissolution results.
An Analytical Approach for One-Dimensional Advection-Diffusion Equation with ...IRJET Journal
This document presents an analytical solution to a one-dimensional advection-diffusion equation with time-dependent variable coefficients in a semi-infinite porous medium. The dispersion parameter and seepage velocity are modeled as hyperbolically decreasing functions of time. Analytical solutions are obtained using Laplace transforms. Numerical solutions are compared to validate the analytical solution. The effect of various physical parameters on contaminant concentration is illustrated graphically.
Aligned magnetic field, radiation and chemical reaction effects on unsteady d...Alexander Decker
This document summarizes a study that analyzes the laminar convective flow of a dusty viscous fluid with non-conducting walls in the presence of an aligned magnetic field, considering effects of volume fraction, radiation, heat absorption, and chemical reaction. The governing equations for the fluid velocity, dust particle velocity, temperature, and concentration are presented and non-dimensionalized. The equations are then solved using a perturbation technique. Boundary conditions are also specified.
International Journal of Engineering Research and Applications (IJERA) is an open access online peer reviewed international journal that publishes research and review articles in the fields of Computer Science, Neural Networks, Electrical Engineering, Software Engineering, Information Technology, Mechanical Engineering, Chemical Engineering, Plastic Engineering, Food Technology, Textile Engineering, Nano Technology & science, Power Electronics, Electronics & Communication Engineering, Computational mathematics, Image processing, Civil Engineering, Structural Engineering, Environmental Engineering, VLSI Testing & Low Power VLSI Design etc.
The document discusses environmental modeling and transport phenomena. It covers topics like Fick's laws of diffusion, the transport equation, and dimensionless formulations. Numerical methods for solving transport equations like the finite difference method are presented. Case studies on models for river water quality and biodegradation kinetics are analyzed. Redox sequences and their importance in environmental systems are also introduced.
In this paper, linear graphical method, moment method and inverse function method are first applied in the laboratory test of one dimensional sand column device, determining the longitudinal dispersion coefficient. The longitudinal dispersions for five groups of sand taken from 20cm below the ground surface in the Oil Refinery of China Petroleum Ningxia Filial are obtained. On this basis, the problems within the calculation process when the three kinds of methods are applied into actual data were discussed. It can be readily concluded that the three values of dispersion coefficients are approximate, and the errors caused by the subjective factors of artificial mapping and numerical reading were avoided. The inverse function method is recommended to apply for the high accuracy, sample calculation process, less known conditions and better linearity.
- Permeability is a property of porous rocks that measures their ability to transmit fluids. Higher permeability means fluids can flow more easily through the rock.
- Darcy's law states that for laminar flow through a permeable medium, the flow rate is proportional to the permeability of the medium and the pressure gradient, and inversely proportional to the fluid viscosity.
- There are different units used to measure and describe permeability, including darcies and millidarcies. Permeability is a key parameter in evaluating reservoir performance and fluid flow.
This document discusses dual-frequency resistivity logging, a well logging method that uses different current frequencies to measure formation resistivity. It introduces the principle that reservoirs exhibit a dispersion phenomenon where resistivity values differ between low and high frequencies due to the capacitive effect of oil. This allows distinguishing oil and water layers based on the ratio of low to high frequency resistivity. The document provides an example application in a Chinese oil field where dual-frequency logging accurately identified oil and water zones. It concludes that dual-frequency logging has good adaptability to different lithologies and salinities and is a promising technique for reservoir evaluation.
Removal of cadmium from aqueous solution using cobalt silicate precipitation ...IJSIT Editor
This document discusses the removal of cadmium from aqueous solutions using cobalt silicate precipitation tubes (CoSPT) as an adsorbent. CoSPT was synthesized through a "silica garden" process and found to be an effective adsorbent for cadmium. Batch adsorption studies were conducted to determine the effect of contact time, adsorbent dose, initial cadmium concentration, temperature, and pH. Experimental data fit the Langmuir and Freundlich isotherm models well. Kinetic studies showed that the pseudo-second order model provided the best fit. The maximum adsorption capacity of CoSPT for cadmium was estimated to be 319 mg/g based on
Exact Solutions of Axially Symmetric Bianchi Type-I Cosmological Model in Lyr...IOSR Journals
In this paper we have obtained axially symmetric Bianchi type-I cosmological models for perfect
fluid distribution in the context of Lyra’s manifold. Exact solutions of the field equations are obtained by
assuming the expansion in the model is proportional to the shear . This leads to the condition
A Bn
where A and B are scale factors and n( 0) is a constant. Some kinematical and physical parameters of the
model have been discussed. The solutions are compatible with recent observations.
This document contains 19 multiple choice questions regarding mechanical properties of fluids. The questions cover topics such as pressure, density, buoyancy, and their relationships. Key details assessed include the definitions of fluid, gauge pressure, factors that influence pressure in liquids, and applications of fluid properties such as hydraulic jacks.
International Journal of Computational Engineering Research (IJCER) is dedicated to protecting personal information and will make every reasonable effort to handle collected information appropriately. All information collected, as well as related requests, will be handled as carefully and efficiently as possible in accordance with IJCER standards for integrity and objectivity
The document discusses different ways of representing water budgets and fluxes between reservoirs in a conceptual hydrological model. It proposes using a formalized set of symbols to represent different types of reservoirs, fluxes, inputs, outputs, and relationships in a clear and standardized way. This is aimed at building an "algebra of objects" to concisely capture the key interactions and mass balances governing a reservoir system. Examples are provided of simple reservoir models represented with this symbolic notation.
This document describes a graphical language for representing reservoir systems using time-continuous Petri nets (TCPN).
Places in the TCPN represent water storages such as volumes of groundwater or energy/momentum contents. Transitions represent fluxes between storages. The TCPN uses colors to distinguish different types of quantities (mass, energy, etc.) and storages. Connections between places and transitions represent differential equations governing the system.
An example TCPN represents a system of three differential equations with three storages, inputs, and both linear and nonlinear fluxes. Additional information like parameter values can be provided in tables. Adjacency matrixes describe the connections between places and transitions. TCPNs provide an algebraic framework for conceptual
Pakistan; Adsorption of Heavy Metals In Slow Sand Filters SystemsV9X
1. The document discusses batch adsorption tests conducted to establish adsorption isotherms for heavy metals like copper, chromium, lead, and cadmium onto sand in slow sand filters.
2. The tests aimed to confirm that adsorption was one of the mechanisms for heavy metal removal in slow sand filters. Results showed the adsorption followed both the Langmuir and Freundlich adsorption isotherm models.
3. Maximum adsorption capacities from the Langmuir isotherm were highest for lead, followed by copper, chromium, and cadmium. The Freundlich constant was highest for copper, possibly due to its higher initial concentration. Values exceeded 1, indicating good adsorption of
This document summarizes research on the structure and phase behavior of Cu-Ni nanoalloys. It uses thermodynamic modeling to predict how the phase diagrams and mixing/demixing behavior depend on nanoparticle size, shape, and temperature. The modeling indicates Cu-Ni nanoalloys can form either mixed particles or Janus particles, depending on the synthesis temperature, with nickel preferentially segregating to surfaces. Phase maps are provided to guide experimentalists on controlling particle structure.
Mesoscopic simulation of incompressible fluid flow in porous mediaeSAT Journals
Abstract
Lattice Boltzmann method is used to simulate cavity driven fluid flow in porous media. A square cavity is considered with the top
lid moving with uniform velocity and other sides kept stationary. Simulation is carried out for values of Darcy number ranging
from 10-6 to10-2 at Reynolds number 10 and 100. Influence of Darcy number and Reynolds number is investigated on velocity
profiles and the streamline plots. Half-way bounce back boundary conditions are employed in the numerical simulation. The
numerical code is first verified with the results available in the literature and then used to simulate the Newtonian fluid flow in
porous media. The Darcy number and the Reynolds number were observed to have great influence on the flow properties and the
location of the primary vortex. Simulation was carried out for a 100100 mesh grid and a fine agreement is established theories
in incompressible fluid flow.
Keywords: Lattice Boltzmann method, incompressible flow, porous media
On Similarity of Differential Capacity and Capillary Pressure FractalKhalid Al-Khidir
On Similarity of Differential Capacity and Capillary Pressure Fractal Dimensions for Characterizing Shajara Reservoirs of the Permo-Carboniferous Shajara Formation, Saudi Arabia
ANALYSIS OF POSSIBILITY OF GROWTH OF SEVERAL EPITAXIAL LAYERS SIMULTANEOUSLY ...ijoejournal
We analyzed nonlinear model with varying in space and time coefficients of growth of epitaxial layers
from gas phase in a vertical reactor with account native convection. We formulate several conditions to
increase homogeneity of epitaxial layers with varying of technological process parameters.
This document summarizes a study that used lattice Boltzmann methods to simulate fluid flow through porous media. The study varied the Darcy number from 10-6 to 10-2 and the Reynolds number at 10 and 100 to observe their effects. Velocity profiles and streamline plots were produced from the simulations. Decreasing the Darcy number, which represents permeability, was found to significantly influence the flow properties and location of primary vortices within the porous media. The numerical simulations agreed well with existing theories on incompressible fluid flow.
This document summarizes various models and theories of drug dissolution. It discusses diffusion layer theory, which involves drug dissolving from the solid into a saturated film and then diffusing into the bulk solution. The Noyes-Whitney and Nerst-Brunner equations are presented to model this. Other models covered include zero-order and first-order release kinetics, the Hixson-Crowell cube root model accounting for changing surface area, Danckwert's surface renewal theory, and the interfacial barrier/limited solvation theory involving an energy barrier to dissolution. Theories of dissolution aim to quantitatively understand and interpret in vitro dissolution results.
An Analytical Approach for One-Dimensional Advection-Diffusion Equation with ...IRJET Journal
This document presents an analytical solution to a one-dimensional advection-diffusion equation with time-dependent variable coefficients in a semi-infinite porous medium. The dispersion parameter and seepage velocity are modeled as hyperbolically decreasing functions of time. Analytical solutions are obtained using Laplace transforms. Numerical solutions are compared to validate the analytical solution. The effect of various physical parameters on contaminant concentration is illustrated graphically.
Aligned magnetic field, radiation and chemical reaction effects on unsteady d...Alexander Decker
This document summarizes a study that analyzes the laminar convective flow of a dusty viscous fluid with non-conducting walls in the presence of an aligned magnetic field, considering effects of volume fraction, radiation, heat absorption, and chemical reaction. The governing equations for the fluid velocity, dust particle velocity, temperature, and concentration are presented and non-dimensionalized. The equations are then solved using a perturbation technique. Boundary conditions are also specified.
International Journal of Engineering Research and Applications (IJERA) is an open access online peer reviewed international journal that publishes research and review articles in the fields of Computer Science, Neural Networks, Electrical Engineering, Software Engineering, Information Technology, Mechanical Engineering, Chemical Engineering, Plastic Engineering, Food Technology, Textile Engineering, Nano Technology & science, Power Electronics, Electronics & Communication Engineering, Computational mathematics, Image processing, Civil Engineering, Structural Engineering, Environmental Engineering, VLSI Testing & Low Power VLSI Design etc.
The document discusses environmental modeling and transport phenomena. It covers topics like Fick's laws of diffusion, the transport equation, and dimensionless formulations. Numerical methods for solving transport equations like the finite difference method are presented. Case studies on models for river water quality and biodegradation kinetics are analyzed. Redox sequences and their importance in environmental systems are also introduced.
In this paper, linear graphical method, moment method and inverse function method are first applied in the laboratory test of one dimensional sand column device, determining the longitudinal dispersion coefficient. The longitudinal dispersions for five groups of sand taken from 20cm below the ground surface in the Oil Refinery of China Petroleum Ningxia Filial are obtained. On this basis, the problems within the calculation process when the three kinds of methods are applied into actual data were discussed. It can be readily concluded that the three values of dispersion coefficients are approximate, and the errors caused by the subjective factors of artificial mapping and numerical reading were avoided. The inverse function method is recommended to apply for the high accuracy, sample calculation process, less known conditions and better linearity.
- Permeability is a property of porous rocks that measures their ability to transmit fluids. Higher permeability means fluids can flow more easily through the rock.
- Darcy's law states that for laminar flow through a permeable medium, the flow rate is proportional to the permeability of the medium and the pressure gradient, and inversely proportional to the fluid viscosity.
- There are different units used to measure and describe permeability, including darcies and millidarcies. Permeability is a key parameter in evaluating reservoir performance and fluid flow.
This document discusses dual-frequency resistivity logging, a well logging method that uses different current frequencies to measure formation resistivity. It introduces the principle that reservoirs exhibit a dispersion phenomenon where resistivity values differ between low and high frequencies due to the capacitive effect of oil. This allows distinguishing oil and water layers based on the ratio of low to high frequency resistivity. The document provides an example application in a Chinese oil field where dual-frequency logging accurately identified oil and water zones. It concludes that dual-frequency logging has good adaptability to different lithologies and salinities and is a promising technique for reservoir evaluation.
Removal of cadmium from aqueous solution using cobalt silicate precipitation ...IJSIT Editor
This document discusses the removal of cadmium from aqueous solutions using cobalt silicate precipitation tubes (CoSPT) as an adsorbent. CoSPT was synthesized through a "silica garden" process and found to be an effective adsorbent for cadmium. Batch adsorption studies were conducted to determine the effect of contact time, adsorbent dose, initial cadmium concentration, temperature, and pH. Experimental data fit the Langmuir and Freundlich isotherm models well. Kinetic studies showed that the pseudo-second order model provided the best fit. The maximum adsorption capacity of CoSPT for cadmium was estimated to be 319 mg/g based on
Exact Solutions of Axially Symmetric Bianchi Type-I Cosmological Model in Lyr...IOSR Journals
In this paper we have obtained axially symmetric Bianchi type-I cosmological models for perfect
fluid distribution in the context of Lyra’s manifold. Exact solutions of the field equations are obtained by
assuming the expansion in the model is proportional to the shear . This leads to the condition
A Bn
where A and B are scale factors and n( 0) is a constant. Some kinematical and physical parameters of the
model have been discussed. The solutions are compatible with recent observations.
This document contains 19 multiple choice questions regarding mechanical properties of fluids. The questions cover topics such as pressure, density, buoyancy, and their relationships. Key details assessed include the definitions of fluid, gauge pressure, factors that influence pressure in liquids, and applications of fluid properties such as hydraulic jacks.
International Journal of Computational Engineering Research (IJCER) is dedicated to protecting personal information and will make every reasonable effort to handle collected information appropriately. All information collected, as well as related requests, will be handled as carefully and efficiently as possible in accordance with IJCER standards for integrity and objectivity
The document discusses different ways of representing water budgets and fluxes between reservoirs in a conceptual hydrological model. It proposes using a formalized set of symbols to represent different types of reservoirs, fluxes, inputs, outputs, and relationships in a clear and standardized way. This is aimed at building an "algebra of objects" to concisely capture the key interactions and mass balances governing a reservoir system. Examples are provided of simple reservoir models represented with this symbolic notation.
This document describes a graphical language for representing reservoir systems using time-continuous Petri nets (TCPN).
Places in the TCPN represent water storages such as volumes of groundwater or energy/momentum contents. Transitions represent fluxes between storages. The TCPN uses colors to distinguish different types of quantities (mass, energy, etc.) and storages. Connections between places and transitions represent differential equations governing the system.
An example TCPN represents a system of three differential equations with three storages, inputs, and both linear and nonlinear fluxes. Additional information like parameter values can be provided in tables. Adjacency matrixes describe the connections between places and transitions. TCPNs provide an algebraic framework for conceptual
The Effect of Geometry Parameters and Flow Characteristics on Erosion and Sed...Dr. Amarjeet Singh
One of the most critical problems in the river
engineering field is scouring, sedimentation and morphology
of a river bed. In this paper, a finite volume method
FORTRAN code is provided and used. The code is able to
model the sedimentation. The flow and sediment were
modeled at the interception of the two channels. It is applied
an experimental model to evaluate the results. Regarding the
numerical model, the effects of geometry parameters such as
proportion of secondary channel to main channel width and
intersection angle and also hydraulic conditionals like
secondary to main channel discharge ratio and inlet flow
Froude number were studied on bed topographical and flow
pattern. The numerical results show that the maximum
height of bed increased to 32 percent as the discharge ratio
reaches to 51 percent, on average. It is observed that the
maximum height of sedimentation decreases by declining in
main channel to secondary channel Froude number ratio. On
the assessment of the channel width, velocity and final bed
height variations have changed by given trend, in all the
ratios. Also, increasing in the intersection angle accompanied
by decreasing in flow velocity variations along the channel.
The pattern of velocity and topographical bed variations are
also constant in any studied angles.
IJRET : International Journal of Research in Engineering and Technology is an international peer reviewed, online journal published by eSAT Publishing House for the enhancement of research in various disciplines of Engineering and Technology. The aim and scope of the journal is to provide an academic medium and an important reference for the advancement and dissemination of research results that support high-level learning, teaching and research in the fields of Engineering and Technology. We bring together Scientists, Academician, Field Engineers, Scholars and Students of related fields of Engineering and TechnologyIJRET : International Journal of Research in Engineering and Technology is an international peer reviewed, online journal published by eSAT Publishing House for the enhancement of research in various disciplines of Engineering and Technology. The aim and scope of the journal is to provide an academic medium and an important reference for the advancement and dissemination of research results that support high-level learning, teaching and research in the fields of Engineering and Technology. We bring together Scientists, Academician, Field Engineers, Scholars and Students of related fields of Engineering and Technology
Comparison of flow analysis of a sudden and gradual change of pipe diameter u...eSAT Journals
Abstract This paper describes an analytical approach to describe the areas where Pipes (used for flow of fluids) are mostly susceptible to damage and tries to visualize the flow behaviour in various geometric conditions of a pipe. Fluent software was used to plot the characteristics of the flow and gambit software was used to design the 2D model. Two phase Computational fluid dynamics calculations, using K-epsilon model were employed. This simulation gives the values of pressure and velocity contours at various sections of the pipe in which water as a media. A comparison was made with the sudden and gradual change of pipe diameter (i.e., expansion and contraction of the pipe). The numerical results were validated against experimental data from the literature and were found to be in good agreement. Index Terms: gambit, fluent software.
Applying the “abcd” monthly water balance model for some regions in the unite...Alexander Decker
This document describes applying the "abcd" monthly water balance model to three catchment regions in the United States to assess the model's feasibility in different climate regions. The model was able to adequately simulate streamflow for two catchments in warm, humid regions but was not able to simulate a catchment dominated by snowfall. Model parameters were calibrated for one catchment and applied successfully to another similar catchment, demonstrating potential for regionalization. However, the model requires modifications to account for snow dynamics to be effective in snow-dominated regions.
The International Journal of Engineering & Science is aimed at providing a platform for researchers, engineers, scientists, or educators to publish their original research results, to exchange new ideas, to disseminate information in innovative designs, engineering experiences and technological skills. It is also the Journal's objective to promote engineering and technology education. All papers submitted to the Journal will be blind peer-reviewed. Only original articles will be published.
The papers for publication in The International Journal of Engineering& Science are selected through rigorous peer reviews to ensure originality, timeliness, relevance, and readability.
Heat and Mass Transfer Hydromagnetic Radiative Casson Fluid Flow over an Expo...inventionjournals
The present paper examines the hydromagnetic two-dimensional boundary layer flow of a nonNewtonian fluid accompanied by heat and mass transfer towards an exponentially stretching sheet in the presence of chemical reaction and thermal radiation. Casson model is used to characterize non-Newtonian fluid behavior. Using the similarity transformations, the governing partial differential equations are transformed into self-similar ordinary differential equations is solved by using Matlab bvp4c package. The effects of pertinent parameters are presented in both graphical and tabular form.
Heat and Mass Transfer Hydromagnetic Radiative Casson Fluid Flow over an Expo...inventionjournals
The present paper examines the hydromagnetic two-dimensional boundary layer flow of a nonNewtonian fluid accompanied by heat and mass transfer towards an exponentially stretching sheet in the presence of chemical reaction and thermal radiation. Casson model is used to characterize non-Newtonian fluid behavior. Using the similarity transformations, the governing partial differential equations are transformed into self-similar ordinary differential equations is solved by using Matlab bvp4c package. The effects of pertinent parameters are presented in both graphical and tabular form.
SUBMERGED HORIZONTAL PLATE FOR COASTAL RETREATING CONTROL: THE CASE OF POLIGN...marmar83
Many sites along the Apulian coast (SE Italy) are composed of weathered and fractured carbonate rocks, affected by intense erosion and frequent sliding. A detailed research of the University of Bari (Andriani and Walsh, 2007) highlighted that from 1997 through 2003, the cliff retreat rate varied from 0.01 to 0.1 myr-1, mostly as a consequence of wave action. In the case of Polignano a Mare, a small town 30 km far from Bari, the erosive process seems to be seriously affecting the stability of buildings. Here, because of the bathymetry, the traditional rubble mound breakwaters are not suited. As an alternative, a rigid horizontal submerged plate on piles is here considered. Since there is no universally accepted theory nor formula to calculate the hydraulic performance of such kind of structure physical models have been constructed at HR Wallingford and subjected to random wave attacks. This paper discusses results of those tests.
Austin Journal of Hydrology is an open access, peer reviewed, scholarly journal dedicated to publish articles in all areas of Hydrology.
The aim of the journal is to provide a platform for engineers, scientists and academicians all over the world to endorse, discuss and share various new issues and developments in diverse areas of hydrology.
Austin Journal of Hydrology accepts original research articles, review articles, case reports, commentaries, clinical images and rapid communication on all the aspects of Hydrology.
This document summarizes key concepts about wave deformation, including refraction, diffraction, and breaking. It discusses how wave refraction causes wave crests to bend toward depth contours as waves propagate into shallower water. Diffraction causes wave energy to spread laterally around barriers. Wave breaking occurs when the wave steepness exceeds certain thresholds and depends on beach slope. It classifies breakers as spilling, plunging, or surging based on wave and slope characteristics. Refraction diagrams and formulas are presented to analyze wave behavior near coastal structures.
1. The document is an exam for a transport phenomena course covering topics like boundary layers, pressure gradients, and flow in conical tubes.
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A synthetic review of contraceptive supplies in punjabAlexander Decker
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A synthesis of taylor’s and fayol’s management approaches for managing market...Alexander Decker
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A survey paper on sequence pattern mining with incrementalAlexander Decker
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A survey on data mining and analysis in hadoop and mongo dbAlexander Decker
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This document surveys trust architectures that leverage provenance in wireless sensor networks. It begins with background on provenance, which refers to the documented history or derivation of data. Provenance can be used to assess trust by providing metadata about how data was processed. The document then discusses challenges for using provenance to establish trust in wireless sensor networks, which have constraints on energy and computation. Finally, it provides background on trust, which is the subjective probability that a node will behave dependably. Trust architectures need to be lightweight to account for the constraints of wireless sensor networks.
This document discusses private equity investments in Kenya. It provides background on private equity and discusses trends in various regions. The objectives of the study discussed are to establish the extent of private equity adoption in Kenya, identify common forms of private equity utilized, and determine typical exit strategies. Private equity can involve venture capital, leveraged buyouts, or mezzanine financing. Exits allow recycling of capital into new opportunities. The document provides context on private equity globally and in developing markets like Africa to frame the goals of the study.
This document discusses a study that analyzes the financial health of the Indian logistics industry from 2005-2012 using Altman's Z-score model. The study finds that the average Z-score for selected logistics firms was in the healthy to very healthy range during the study period. The average Z-score increased from 2006 to 2010 when the Indian economy was hit by the global recession, indicating the overall performance of the Indian logistics industry was good. The document reviews previous literature on measuring financial performance and distress using ratios and Z-scores, and outlines the objectives and methodology used in the current study.
Digital Marketing Trends in 2024 | Guide for Staying AheadWask
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How to Interpret Trends in the Kalyan Rajdhani Mix Chart.pdfChart Kalyan
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What will you get from this session?
1. Insights into integrating generative AI.
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3. Practical demonstrations
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Test Automation with generative AI and Open AI.
UiPath integration with generative AI
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Cosa hanno in comune un mattoncino Lego e la backdoor XZ?Speck&Tech
ABSTRACT: A prima vista, un mattoncino Lego e la backdoor XZ potrebbero avere in comune il fatto di essere entrambi blocchi di costruzione, o dipendenze di progetti creativi e software. La realtà è che un mattoncino Lego e il caso della backdoor XZ hanno molto di più di tutto ciò in comune.
Partecipate alla presentazione per immergervi in una storia di interoperabilità, standard e formati aperti, per poi discutere del ruolo importante che i contributori hanno in una comunità open source sostenibile.
BIO: Sostenitrice del software libero e dei formati standard e aperti. È stata un membro attivo dei progetti Fedora e openSUSE e ha co-fondato l'Associazione LibreItalia dove è stata coinvolta in diversi eventi, migrazioni e formazione relativi a LibreOffice. In precedenza ha lavorato a migrazioni e corsi di formazione su LibreOffice per diverse amministrazioni pubbliche e privati. Da gennaio 2020 lavora in SUSE come Software Release Engineer per Uyuni e SUSE Manager e quando non segue la sua passione per i computer e per Geeko coltiva la sua curiosità per l'astronomia (da cui deriva il suo nickname deneb_alpha).
For the full video of this presentation, please visit: https://www.edge-ai-vision.com/2024/06/building-and-scaling-ai-applications-with-the-nx-ai-manager-a-presentation-from-network-optix/
Robin van Emden, Senior Director of Data Science at Network Optix, presents the “Building and Scaling AI Applications with the Nx AI Manager,” tutorial at the May 2024 Embedded Vision Summit.
In this presentation, van Emden covers the basics of scaling edge AI solutions using the Nx tool kit. He emphasizes the process of developing AI models and deploying them globally. He also showcases the conversion of AI models and the creation of effective edge AI pipelines, with a focus on pre-processing, model conversion, selecting the appropriate inference engine for the target hardware and post-processing.
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Salesforce Integration for Bonterra Impact Management (fka Social Solutions A...Jeffrey Haguewood
Sidekick Solutions uses Bonterra Impact Management (fka Social Solutions Apricot) and automation solutions to integrate data for business workflows.
We believe integration and automation are essential to user experience and the promise of efficient work through technology. Automation is the critical ingredient to realizing that full vision. We develop integration products and services for Bonterra Case Management software to support the deployment of automations for a variety of use cases.
This video focuses on integration of Salesforce with Bonterra Impact Management.
Interested in deploying an integration with Salesforce for Bonterra Impact Management? Contact us at sales@sidekicksolutionsllc.com to discuss next steps.
Webinar: Designing a schema for a Data WarehouseFederico Razzoli
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#MongoDB #VectorSearch #AI #SemanticSearch #TechInnovation #DataScience #LLM #MachineLearning #SearchTechnology
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Monitoring and Managing Anomaly Detection on OpenShift
Overview
Dive into the world of anomaly detection on edge devices with our comprehensive hands-on tutorial. This SlideShare presentation will guide you through the entire process, from data collection and model training to edge deployment and real-time monitoring. Perfect for those looking to implement robust anomaly detection systems on resource-constrained IoT/edge devices.
Key Topics Covered
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- Understand the fundamentals of anomaly detection and its importance in identifying unusual behavior or failures in systems.
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12. Jupyter Notebooks with Code Examples
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Threats to mobile devices are more prevalent and increasing in scope and complexity. Users of mobile devices desire to take full advantage of the features
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National Security Agency - NSA mobile device best practices
Enhanced one dimensional modeling for predicting
1. Journal of Natural Sciences Research www.iiste.org
ISSN 2224-3186 (Paper) ISSN 2225-0921 (Online)
Vol.2, No.5, 2012
Enhanced One Dimensional Modeling for Predicting
Concentration of BOD in rivers
Babita Tyagi1* Ritu Kapoor2 Deepa Sinha3 Devendra Swaroop Bhargava4
1. Department of Mathematics, Galgotias University, Greater Noida,India
2. Department of Mathematics,Gurgaon Institute of Techology and Management, Maharishi Dayanand
University, Rohtak,India
3. Department of Mathematics Banasthali University, Rajasthan, India
4. Former Professor,Department of Civil Engineering, Roorkee University (Now IIT Roorkee), U.P., India
* E-mail of the corresponding author: babita40@gmail.com
Abstract
To maintain the river water quality it is necessary to predict the concentration of biochemical oxygen demand
(BOD) in rivers. Various one dimensional models that are developed so far are applicable only after complete
mixing of the pollutant across the cross-section is over which may take longer time for rivers with large width.
Such type of situations is not represented effectively by the existing one dimensional model. Moreover, many of
these one dimensional models do not account for the settle able part of BOD that invariably takes place when
partially treated/ untreated waste enters these water bodies. A model is developed that is not more complicated
than a one dimensional model but rationally predict the transport of BOD causing pollutant in almost 80% of
initial period. The presented model can be used in conditions when partially treated/untreated waste is discharged
in rivers with large width.
Keywords: Mathematical Model, BOD, Water Pollution
1. Introduction
It has been a common practice throughout the world to discharge waste material into the streams. In order to
control contamination of a stream and predict the levels of accidental pollution an understanding is required of a
rate at which a stream is capable of transporting pollutant. The contamination of organic matter into the river is
determined by a non conservative parameter known as BOD. The first developed model by Streeter and Phelps
in 1925[13], for the formulation of BOD includes only the dissolved part of BOD and does not account for the
settleable part of BOD. Bhargava presented a model in 1983 [2] for accurate prediction of transport of organic
matter containing both types of BOD settleable as well as dissolved. The model suggested that BOD was seemed
to be removed in two forms, settleable part is removed by the linear settling law and non-settleable i.e. dissolved
part follows the usual first order kinetics with a decay constant ‘k’. Moreover the assumption of Streeter and
Phelps that advection is the only relevent transport mechanism unnecessarily restricts the model’s validity in the
present era of digital computers
Various one dimensional models ( [1],[3],[4],[7],[9],[11],[12],[14] ) developed to date are valid only when
mixing length is over i.e. they are not valid in the initial period but the fact is that mixing takes some time to
complete which may be longer for rivers with large width and this fact is ignored while using these models to
predict the BOD immediately after the point of discharge of pollutant.
Tyagi et. al.[15] developed a one dimensional model that takes into consideration the transport of both type of
BOD( settleable as well as dissolved) into the rivers but this model is also applicable only after mixing length is
over. Various two dimensional models ( [5],[6],[8] and[16] ) are available but they need a considerable amount
of hydraulic data which in many cases in not available and has to be estimated or assumed which may lead to a
partial loss of accuracy gained through multidimensional models.
An Enhanced one dimensional model is proposed by Reichert, P. and Wanner, O. [10] that is capable of
predicting substance distribution for about 80% of the initial period. In the present work, the model suggested by
Reichert, P. and Wanner O.[10] is modified to predict transport of BOD conditions in the river due to discharge
of partially treated or untreated organic matter containing both types of BOD namely settleable and dissolved.
2. Physical problem
Consider the portion of river with a large width to length ratio. Let the partially treated/untreated waste is
disposed into the river through a point source (such as disposal through a single drain). The entire BOD in
25
2. Journal of Natural Sciences Research www.iiste.org
ISSN 2224-3186 (Paper) ISSN 2225-0921 (Online)
Vol.2, No.5, 2012
this case consists of two parts viz. dissolved and settleable. Let the source strength vary with time at the
outfall itself, which represents the case of malfunctioning of equipment or accidental spill of pollutant. It is
required to predict the DO conditions in river due to the discharge of organic waste in the above stated
situations.
The following velocity profile (in lateral direction) is assumed
u(y) = 0 ; 0 ≤ y < p.α/2
v α
; p.α/2 ≤ y ≤ p 1 −
1−α 2
α
0 ; p 1 − < y≤ p
2
Where u(y) = Depth –averaged velocity(L/T);p = width of river (L);y = space co-ordinate transverse to the
flow direction (L);v = Cross-section mean velocity (L/T);α = Fraction of the wetted crossectional area
where u is assumed to be zero.
denoted by γ
Advective Zone
Stagnant Zone
α(x).A [1- α(x)].A
Figure1Conceptual model of crossectional velocity profile in the advective and stagnant zone of river.
3. Model Development
The cross-section of the river is divided into two zones namely advective zone in the centre of the river and
stagnant zone along the two banks where the velocity is almost zero. A mathematical model is developed for the
above stated river system based on the following assumptions:
• The entire BOD is in two forms namely settleable as well as dissolved forms. The dissolved part of
BOD is decaying according to first order kinetics while the settleable part is being removed by linear
law.
• The size of stagnant zone is αAT and it consists of two parts located near the river banks while the
size of advective zone is (1-α) AT, where AT is the of cross-section of the river and α is fraction of
wetted cross-sectional area of the stagnant zone however for the sake of simplicity we are taking αAT
= As and (1-α) AT = A.
• No transverse gradient exists within any of the two zones but there is exchange of mass between the
two zones (viz. advective and stagnant) which is related to the difference in the respective
concentration.
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3. Journal of Natural Sciences Research www.iiste.org
ISSN 2224-3186 (Paper) ISSN 2225-0921 (Online)
Vol.2, No.5, 2012
• In stagnant zone, only exchange of mass with the advective zone and reaction are considered.
• In advective zone, advection, reaction and exchange of mass are considered.
• The whole pollutant is being released into the advective zone only.
On the basis of the above assumptions the following equations representing the BOD mass balance equation in
advective zone and stagnant zones are developed as follows:
3.1 Advective Zone
v x
Lo 1 − . ; x < x1
L = d u .................................................................................. (1)
0 ; x ≥ x1
∂Bd γ
0 = −u − kBd − (Bd − B') ................................................................................................. (2)
∂x A
3.2 Stagnant Zone
γ
0= (Bd − B') − kB' .................................................................................................... (3)
As
3.3 Boundary Conditions
The associated boundary conditions reflecting the release of the pollutants according to
assumption mentioned at point 7:
Bd = Bo − d at x = 0
4. Model Development
Equation 1 is solved independently with known values of Lo , v, d, u to get the values of L at various
distances downstream. To solve Equation 2 we need the values of B ' which is obtained from Equation 3 which
gives the value of B ' in terms of Bd . The values of B ' when substituted in Equation 2 gives a first order
differential equation in Bd which is solved by variable separable method. The procedure is explained in the
following steps.
Solving Equation 3, we get
γ
As
B' = Bd
γ +k
A
s
or
β '' γ
B' = Bd , whereβ ' =
(β '+ k ) As
.................................................................... (4)
Using Equation 4 in Equation 2, We get
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4. Journal of Natural Sciences Research www.iiste.org
ISSN 2224-3186 (Paper) ISSN 2225-0921 (Online)
Vol.2, No.5, 2012
∂Bd β' γ
0 = −u + [− kB d ] − β Bd −
Bd whereβ =
∂x (β '+ k ) A
Or
∂Bd k +δ βk
=− Bd , where δ =
∂x u (β '+ k )
Or
∂Bd k +δ
= − µBd , where µ = .................................................................... (5)
∂x u
Solving with the boundary condition Bd = Bo − d at
x = 0, Equation.7 can be solved as
Bd = Bo − d exp (− µx) .................................................................. (6)
The total BOD in the advective zone is then calculated by the following equation:
B = Bd + L x ≤ x1
.................................................................... . (7)
= Bd x > x1
Using Equation.6 in Equation.4 , we get
β'
B ' = ηBo − d exp(− µx) where η = ..................................................................... (8)
β '+ k
The total BOD (TB) at any point x are then calculated by Equation 9 as follows:
TB = (1 − α ) B + αB ' ............................................................ (9)
5. Case Study
5.1
To analyse the capabilities of the presented model, it is applied to Uvas Creek for which the physical parameters
estimated by Bencala and Walter for Uvas Creek California with their values are outlined in Table1, however,
the total area of cross section is divided into two parts for the application of presented model. Some kinetic and
chemical parameters are appropriately taken from the literature and their values are given in Table 2. A
Comparison of concentration of BOD predicted by one dimensional model [11] and presented model is shown in
Figure 2
Table 1. Parameter estimated by Bencala and Walter for Uvass Creek, California
Sr. Parameter Values Units
No.
1 Q 0.013 m3/s
2 A 0.36 m2
3 As 0.64 m2
4 u 2800 m/day
Table 1 represents the values of flow rate denoted by Q,area of crossection of advective and stagnant zone
denoted by A & As respectively and velocity of river in longitudinal direction denoted by u
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5. Journal of Natural Sciences Research www.iiste.org
ISSN 2224-3186 (Paper) ISSN 2225-0921 (Online)
Vol.2, No.5, 2012
Table 2. Chemical and Kinetic Parameters
Sr. Parameter Values Units
No.
1 k 3 day-1
2 kr’=kr=m 10 day-1
3 Bd 16 mg/L
4 Lo 12 mg/L
5 γ 8957.95 L2/day
Table 2 contains the values decay coefficient of BOD denoted by k, coefficient of reaeration in advective and
stagnant denoted by kr and kr’ ,rate of degradation of settleable BOD part denoted by m,initial settleable BOD
denoted by Lo, initial dissolved BOD denoted by Bo-d and exchange rate coefficient denoted by γ
Figure 2 Concentration of BOD predicted by present model & one dimensional model in advective zone.
Figure 2. represents a comparison of BOD predicted by presented model and one dimensional model. It is
observed that concentration of BOD obtained from present model is less than that predicted by one dimensional
model. Since the settleable part is removed faster in present model, it assimilates more BOD and consequently
the remaining BOD would be less with distance downstream.
5.2
To analyse the robustness of model, the values of BOD predicted by the present model are compared with the
observed values of BOD in river Ganges along Kanpur summer is shown in Figure 3.
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6. Journal of Natural Sciences Research www.iiste.org
ISSN 2224-3186 (Paper) ISSN 2225-0921 (Online)
Vol.2, No.5, 2012
Figure 3 Comparison of predicted BOD by the present model with the observed values.
Figure 3 represents a comparison of BOD as predicted by the present model with the observed BOD values.
A fair agreement of observed and predicted values of BOD establishes the robustness of model in the
situation when partially treated and untreated waste is discharged into the river.
6. Conclusion
The presented model can effectively represent the situation and accurately predict the concentration of BOD
in rivers with large width when partially treated or untreated waste is discharged into the river. The robustness of
the model is established by comparing the predicted values of BOD with the observed values for a real river
data. The accurate prediction of BOD values by the presented model may assist engineers and planners in the
formulation of strategies for pollution control caused by BOD containing pollutant in the above stated
conditions.
References
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ASCE, Vol.109, No.1, , 174-188.
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[9] Nemerow, N.L. (1974) “Scientific Stream Pollution Analysis”. McGraw Hill Book Company.
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[11] Rinaldi, S. et.al, 1979 “Modeling and Control of river quality”, McGraw Hill Book Co.
[12] Runkel, R.L. (1998) “One dimensional transport with inflow and storage (OTIS): A solute transport model for streams and rivers”, U.S.
Geological Survey, Water Resources, Investigation Report 98-4018, p 73,.
[13] Streeter, M.W. Phelps, E.B. (1925) “A study of the pollution and natural purification of the Ohio River”, Public Health Service
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[14] Thomann, R.V. and Mueller, J.A. (1987) “Principles of surface water quality modeling and control”, New York, DC: Harper and Row
publishers,
[15] Tyagi, B Gakkar, S. and Bhargava, D.S.(1999) “Mathematical Modeling of stream DO-BOD accounting for settle able BOD and
periodically varying BOD source,” U.K. Journal of Environmental Modeling and Software, Elsevier, vol.5, no.14, pp 461-471.
[16] Yotsukura, N. and Sayre, W. (1976) “Transverse mixing in natural channels”, Water Resource. vol.4, no 12, pp 695-704.
30
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