Yenigul, N.B., Elfeki, A.M.M. (2002). Influence of Subsurface Heterogeneity on Detection of Landfill Leakage. Published at 14th International Conference Computational Methods in Water Resources “CMWR2002”, Developments in Water Science No. 47, Elsevier Publisher, The Netherlands, pp. 1323-1330. Eds. SM Hassanizadeh, RJ Schotting, WG Gray, and GF Pinder.
INFLUENCE OF UNCERTAINTY IN LEAK LOCATION ON DETECTION OF CONTAMINANT PLUMES ...Amro Elfeki
Contaminants are introduced in groundwater by planned human activities rather than by the natural phenomena. Landfills, represent a widespread and significant threat to groundwater quality. Therefore monitoring well networks at these sites are of vital importance in detecting plumes. However, it is often difficult to ensure a specific network which will detect all of the contaminants released from the landfill because of the numerous significant uncertainties that are involved.
Presentation given at the 2nd SILTFLUX workshop on 19/05/2015 at UCD. Authors: Michael Bruen, Mary Kelly-Quinn, John O'Sullivan, Jonathan Turner, Elizabeth Conroy, Anna Rymszewicz, Damian Lawler, John Wallace
Presentation given at the 2nd SILTFLUX workshop on 19/05/2015 at UCD. Authors: Elizabeth Conroy, Jonathan Turner, Michael Bruen, John O'Sullivan, Anna Rymszewicz, Mary Kelly-Quinn
INFLUENCE OF UNCERTAINTY IN LEAK LOCATION ON DETECTION OF CONTAMINANT PLUMES ...Amro Elfeki
Contaminants are introduced in groundwater by planned human activities rather than by the natural phenomena. Landfills, represent a widespread and significant threat to groundwater quality. Therefore monitoring well networks at these sites are of vital importance in detecting plumes. However, it is often difficult to ensure a specific network which will detect all of the contaminants released from the landfill because of the numerous significant uncertainties that are involved.
Presentation given at the 2nd SILTFLUX workshop on 19/05/2015 at UCD. Authors: Michael Bruen, Mary Kelly-Quinn, John O'Sullivan, Jonathan Turner, Elizabeth Conroy, Anna Rymszewicz, Damian Lawler, John Wallace
Presentation given at the 2nd SILTFLUX workshop on 19/05/2015 at UCD. Authors: Elizabeth Conroy, Jonathan Turner, Michael Bruen, John O'Sullivan, Anna Rymszewicz, Mary Kelly-Quinn
Progressive Web Apps w kontekście proximity marketinguPiotr Rytel
Progressive Web Apps w kontekście proximity marketingu - czy całkowite wyeliminowanie aplikacji jest możliwe?
Prezentacja pokazana 14 października w czasie 4 edycji konferencji Marketing Progress we Wrocławiu.
design by Klaudyna Bańczerowska -> https://www.behance.net/cloudy88
Prediction of Contaminant Plumes (Shapes, Spatial Moments and Macro-dispersio...Amro Elfeki
Elfeki, A. M. (2006). Prediction of Contaminant Plumes (Shapes, Spatial Moments and Macro-dispersion) in Aquifers with insufficient Geological Information. Journal of Hydraulic Research, vol. 44 (6), pp 841-856.
İnovatif Kimya Dergisi Sayı-28 Anlatılan Konu Başlıkları
Öldükten Sonra Vücudumuzda Neler Oluyor?
Keskin Sirke Küpüne Zarar
pH Metre İpuçları
DNA Onarımı
Elektrokimyasal Biyosensörler
Nanosensör ve Bizlere Faydaları
Falling Number Analizi
Türkiye’de Kimya
Ayın Web Sitesi, Kimya Sektöründen Haberler, Kimya Sözlüğü, Kimya Bulmacası ile Kükürt Elementi
İyi okumalar dileriz.
Open Trip Pulau Harapan, Kepulauan Seribu UtaraTour de Java
Explore Pulau Harapan selama 2 hari 1 malam adalah Paket Wisata Gabungan atau Sharing Trip di Pulau Harapan dan sekitarnya.
Satu orang bisa langsung mendaftar dan bergabung dengan rekan dan teman perjalanan dari seluruh Nusantara.
Hanya dengan mengeluarkan kocek sebesar IDR 370.000 per orang anda sudah bisa menikmati pesona pulau Harapan, Kepulauan Seribu Utara dan sekitarnya lengkap dengan semua fasilitas wisata mulai dari penginapan homestay, makan selama wisata dan tiket kapal dari Kali Adem Muara Angke ke Pulau Harapan
Unsteady state series CSTR modeling of removal of ammonia nitrogen from domes...IJECEIAES
This work shows simulation results for subsurface vertical flow constructed wetland (VFCW) using a series CSTR model. The VFCW considered received the outflow from a domestic wastewater treatment plant. In addition, it was planted with Cyperus sp. and filter media was unsaturated. The model was based on an unsteady state mass balance for ammonia, nitrites, and nitrates, using one to three series CSTRs. Nitrogen transformation mechanisms considered were ammonification, nitrification, plant uptake and denitrification. The following effects were evaluated: the number of reacting CSTRs from one to three; the occurrence of the reaction in second and third CSTRs for the case that three CSTRs hold; the use of either equal or different values of reaction rate parameters between CSTRs; and the discretization of the reaction rate parameters. The inflow and outflow measurements of ammonium, nitrites, and nitrates were used for model calibration. The estimated parameters included the reaction rate coefficients and reactor water volume. The coefficient of determination (R ) evidenced a satisfactory capability of simulating outlet pollutant concentrations. Two and three reacting CSTRs achieved similar R value (0.54-0.55), whereas one reacting CSTR achieved an R 2 of 0.39, and three CSTRs with reaction only in the first tank achieved an R of 0.42. Discretization of the nitrification rate for the case of two reacting CSTRs led to an R 2 of 0.94. The parameter sensitivity analysis revealed a significant effect of model parameters on the R 2 value. 2 2 2
Progressive Web Apps w kontekście proximity marketinguPiotr Rytel
Progressive Web Apps w kontekście proximity marketingu - czy całkowite wyeliminowanie aplikacji jest możliwe?
Prezentacja pokazana 14 października w czasie 4 edycji konferencji Marketing Progress we Wrocławiu.
design by Klaudyna Bańczerowska -> https://www.behance.net/cloudy88
Prediction of Contaminant Plumes (Shapes, Spatial Moments and Macro-dispersio...Amro Elfeki
Elfeki, A. M. (2006). Prediction of Contaminant Plumes (Shapes, Spatial Moments and Macro-dispersion) in Aquifers with insufficient Geological Information. Journal of Hydraulic Research, vol. 44 (6), pp 841-856.
İnovatif Kimya Dergisi Sayı-28 Anlatılan Konu Başlıkları
Öldükten Sonra Vücudumuzda Neler Oluyor?
Keskin Sirke Küpüne Zarar
pH Metre İpuçları
DNA Onarımı
Elektrokimyasal Biyosensörler
Nanosensör ve Bizlere Faydaları
Falling Number Analizi
Türkiye’de Kimya
Ayın Web Sitesi, Kimya Sektöründen Haberler, Kimya Sözlüğü, Kimya Bulmacası ile Kükürt Elementi
İyi okumalar dileriz.
Open Trip Pulau Harapan, Kepulauan Seribu UtaraTour de Java
Explore Pulau Harapan selama 2 hari 1 malam adalah Paket Wisata Gabungan atau Sharing Trip di Pulau Harapan dan sekitarnya.
Satu orang bisa langsung mendaftar dan bergabung dengan rekan dan teman perjalanan dari seluruh Nusantara.
Hanya dengan mengeluarkan kocek sebesar IDR 370.000 per orang anda sudah bisa menikmati pesona pulau Harapan, Kepulauan Seribu Utara dan sekitarnya lengkap dengan semua fasilitas wisata mulai dari penginapan homestay, makan selama wisata dan tiket kapal dari Kali Adem Muara Angke ke Pulau Harapan
Unsteady state series CSTR modeling of removal of ammonia nitrogen from domes...IJECEIAES
This work shows simulation results for subsurface vertical flow constructed wetland (VFCW) using a series CSTR model. The VFCW considered received the outflow from a domestic wastewater treatment plant. In addition, it was planted with Cyperus sp. and filter media was unsaturated. The model was based on an unsteady state mass balance for ammonia, nitrites, and nitrates, using one to three series CSTRs. Nitrogen transformation mechanisms considered were ammonification, nitrification, plant uptake and denitrification. The following effects were evaluated: the number of reacting CSTRs from one to three; the occurrence of the reaction in second and third CSTRs for the case that three CSTRs hold; the use of either equal or different values of reaction rate parameters between CSTRs; and the discretization of the reaction rate parameters. The inflow and outflow measurements of ammonium, nitrites, and nitrates were used for model calibration. The estimated parameters included the reaction rate coefficients and reactor water volume. The coefficient of determination (R ) evidenced a satisfactory capability of simulating outlet pollutant concentrations. Two and three reacting CSTRs achieved similar R value (0.54-0.55), whereas one reacting CSTR achieved an R 2 of 0.39, and three CSTRs with reaction only in the first tank achieved an R of 0.42. Discretization of the nitrification rate for the case of two reacting CSTRs led to an R 2 of 0.94. The parameter sensitivity analysis revealed a significant effect of model parameters on the R 2 value. 2 2 2
New Approach for Groundwater Detection Monitoring at Landfills. Amro Elfeki
Yenigul, N.B., Elfeki, A. M. and den Akker, C. (2006). New Approach for Groundwater Detection Monitoring at Landfills. Journal of Groundwater Monitoring and Remediation, 26, no. 2/Spring 2006/pp. 79-86.
Reducing Concentration Uncertainty in Geological Structures by Conditioning o...Amro Elfeki
Reducing Concentration Uncertainty in Geological Structures by Conditioning on Boreholes Using the Coupled Markov Chain Approach. 29th Colloquium “ Recent Advances in Subsurface hydrology”, Sept 25, 2003, Dept of Hydrology, Faculty of Civil Engineering, Delft university of Technology, Delft, The Netherlands.
http://www.hyd.citg.tudelft.nl/work/news/news250903.html
This talk was given for Saudi Company Maaden. Different idea why uncertainty quantification in geology, mine business, reservoir description is important.
Sensoring Leakage Current to Predict Pollution Levels to Improve Transmission...Yayah Zakaria
Pollution insulator is a serious threat to the safety operations of electric power systems. Leakage current detection is widely employed in transmission line insulators to assess pollution levels. This paper presents the prediction of pollution levels on insulators based on simulated leakage current and voltage in a transmission tower.The simulation parameters are based on improved transmission line model with leakage current resistance insertion between buses. Artificial neural network (ANN) is employed to predict the level of pollution with different locations of simulated leakage current and voltage between two buses. With a sufficient number of training, the test results showed a significant potential for pollution level prediction
with more than 95% Correct Classification Rate (CCR) and output of the ANN showed high agreement with Simulink results.
Sensoring Leakage Current to Predict Pollution Levels to Improve Transmission...IJECEIAES
Pollution insulator is a serious threat to the safety operations of electric power systems. Leakage current detection is widely employed in transmission line insulators to assess pollution levels. This paper presents the prediction of pollution levels on insulators based on simulated leakage current and voltage in a transmission tower.The simulation parameters are based on improved transmission line model with leakage current resistance insertion between buses. Artificial neural network (ANN) is employed to predict the level of pollution with different locations of simulated leakage current and voltage between two buses. With a sufficient number of training, the test results showed a significant potential for pollution level prediction with more than 95% Correct Classification Rate (CCR) and output of the ANN showed high agreement with Simulink results.
The dosimetry was carried out for radiotherapy patients, and measurements were performed using LiF and thermoluminescent dosimeters (TLDs). Evaluations were done for water-equivalent (effective) thicknesses and target dose with transmission data. Considerations were made for the accuracy of the parameter for the ratio of measured to expected value for each quantity. The entrance dose was estimated as 1.01 ± 0.07. The mean ratio of effective to contour depth was 1.00 ± 0.13, showing a wide distribution reflecting the influence of contour inaccuracies. The mean ratio of the measured contour dose prescription was 1.00 ± 0.07. The difference in depths that is patient and effective depth is a reflection of target dose discrepancies. Graphical simulations were done using Monte-Carlo Simulations and presented.
Similar to Influence of Subsurface Heterogeneity on Detection of Landfill Leakage (20)
Simulation of Tracer Injection from a Well in a Nearly Radial FlowAmro Elfeki
This is a result of Simulation of Tracer Injection from a well in a nearly radial flow using finite difference and particle tracking Radom walks.
To observe the animation of the plume progress in time, one has to download the file.
Aquifer recharge from flash floods in the arid environment: A mass balance ap...Amro Elfeki
Estimation of the infiltration/natural recharge to groundwater from rainfall is an important issue in hydrology, particularly in arid regions. This paper proposes the application of The Natural Resources Conservation Service (NRCS) mass balance model to develop infiltration (F)–rainfall (P) relationship from flash flood events. Moreover, the NRCS method is compared with the rational and the Ф-index methods to investigate the discrepancies between these methods. The methods have been applied to five gauged basins and their 19 sub-basins (representative basins with detailed measurements) in the southwestern part of Saudi Arabia with 161 storms recorded in 4 years. The F–P relationships developed in this study based on NRCS method are: F = 39% P with R2 = 0.932 for the initial abstraction factor, λ = 0.2. However, F = 77% P with R2 = 0.986 for λ = 0.01. The model at λ = 0.01 is the best to fit the data, therefore, it is recommended to use the formula at λ = 0.01. The results show that the NRCS model is appropriate for the estimation of the F–P relationships in arid regions when compared with the rational and the Ф index methods. The latter overestimates the infiltration because they do not take λ into account. There is no significant difference between F–P relationships at different time scales. This helps the prediction of infiltration rates for aquifer recharge at ungauged basins from monthly and annual rainfall data with a single formula.
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.
This is a lecture on well hydraulics. The basics of flow towards the well in confined and unconfined aquifers. Well interactions. Method of images. Flow nets in case of multiple wells. Superposition theory for multiple wells.
This is a lecture on the hydraulics of gradually varied flow in open channels. It shows the profiles common in the open channels and some numerical examples using numerical integration.
Two Dimensional Flood Inundation Modelling In Urban Area Using WMS, HEC-RAS a...Amro Elfeki
This research presents a two-dimensional flood inundation modelling in urbanized areas when some features such as roads, buildings, and fences have great effect on flood propagation. Wadi Qows located in Jeddah City, Saudi Arabia was chosen as case study area because of the flood occurrence of 2009 causing lots of losses either economic or loss of life. The WMS and HEC-RAS program were used for a hydraulic simulation based on channel geometry built by incorporating urban features into DEM using GIS effectively. A resampling method of DEM 90 × 90 m become 10 × 10 m grid cell sizes was conducted to produce a higher resolution DEM suitable for urban flood inundation modelling. The results show that a higher resolution leads to increasing the average flood depth and decreasing the flood extent. Although the change of the grid cell sizes does not affect its elevation values, this approach is helpful to perform flood simulations in urban areas when high resolution DEM availability is limited. In addition, the integration of WMS, HEC-RAS and GIS are powerful tools for flood modelling in rural, mountainous and urban areas.
https://www.researchgate.net/publication/330004725_Two_Dimensional_Flood_Inundation_Modelling_in_Urban_Areas_Using_WMS_HEC-RAS_and_GIS_Case_Study_in_Jeddah_City_Saudi_Arabia_IEREK_Interdisciplinary_Series_for_Sustainable_Development
Representation of of Stochastic Processes in Stochastic Processes in Real and Spectral Domains Real and Spectral Domains and and Monte Monte-Carlo sampling
Development of Flash Flood Risk Assessment Matrix in Arid Environment: Case S...Amro Elfeki
Risk indices and risk matrix have been used among governmental agencies for assessing risks and ranking alternatives protection measures. The popularity of risk matrices can be associated with its characteristics to quick assessing risk and providing inexpensive solutions. The risk assessment is associated with flood protection as: economic, environmental, and life-safety. Economic risks are reasonably well dealt with by the well-known traditional cost-benefit analysis, insurance, and financial markets. Environmental risks are difficult to assess by traditional methods in flood project evaluation. Environmental consequences cannot be directly measured, while social risks represent the most challenge to quantify. It may be possible to estimate the number of fatalities, and cost of damaged infrastructures, while the social aspects cannot be measured. This paper is proposing a flood risk matrix technique for assessing risks in urban arid and extreme arid regions demonstrated through case-study application on the catchment of Taibah University (TU) and Islamic University (IU) in Medina, KSA. The study focused on assessing the geographical impacts of the flash flood inundated depths for different frequencies from 5 to 100 years return periods leading to identification of the flood channels, and its floodplains that may be vulnerable to different degrees of flood hazards.
Derivation of unit hydrograph of Al-Lith basin in the south west of saudi ar...Amro Elfeki
Mohammad Albishi, Jarbou Bahrawi and Amro Elfeki (2016). Derivation of the Unit Hydrograph of Allith Basin in the South West of Saudi Arabia. 7 International Conference on Water Resources and the Arid Environments (ICWRAE 7): 621-628 4-6 December 2016, Riyadh, Saudi Arabia.
Abstract:
Most studies on unit hydrograph theory is developed for temperate regions and to the best of the authors’ knowledge, there is no studies on this topic in arid regions because of the lack of runoff measurements. This paper presents the derivation of a unit hydrograph of a Allith basin and its S-curve in the south western part of Saudi Arabia to be used to predict flash flood more accurately in this region. The derivation is based on the method of stream flow data that has been collected from measured rainfall and runoff storms in the region. The study resulted in the unit hydrograph of 1 hr duration and the S-curve that is used to transfer the hydrograph to any other durations. This unit hydrograph can be used to predict flash floods in Allith basin and similar watersheds.
Empirical equations for flood analysis in arid zonesAmro Elfeki
Mohammad Albishi, Jarbou Bahrawi, and Amro Elfeki (2016). Empirical Equations for Flood Analysis in Arid Zones. Published in the book of abstracts at IWC 2016 International Water Conference 2016 on Water Resources in Arid Areas: the Way Forward.
Empirical equations for estimation of transmission lossesAmro Elfeki
Transmission losses is caused by infiltration into the streambed in ephemeral streams. The conventional methods for flood routing in wadis is impossible to achieve due to transmission losses. The Muskingum routing procedure in its basic form has two parameters, the channel time lag, Km, and the weighting parameter, x. However, both parameters do not consider transmission losses of floods in channels. O’Donnell 1985 introduced a third parameter, α, in the continuity equation to allow for the lateral movement of floodwater. Elfeki et. Al (2014) carry some modifications of the assumptions such that the negative sign of the parameter α represents transmission losses. In this research, the third-parameter α has been investigated as a tool for estimation of transmission losses using data from Yiba catchment in the Kingdom of Saudi Arabia. A spreadsheet model will be developed to deduce the equations.
Proceedings of the Second International Symposium on Flash Floods in Wadi Systems: Disaster Risk Reduction and Water Harvesting in the Arab Region (2016): 166-170
Representative elementary volume (rev) in porousAmro Elfeki
This presentation shows the concept of Representative elementary volume known in porous media. The presentation is the results of an excel spreadsheet prepared to generate hypothetical porous media in 2D. It calculates the porosity of the medium at different scales until it reaches the rev value.
Industrial Training at Shahjalal Fertilizer Company Limited (SFCL)MdTanvirMahtab2
This presentation is about the working procedure of Shahjalal Fertilizer Company Limited (SFCL). A Govt. owned Company of Bangladesh Chemical Industries Corporation under Ministry of Industries.
Final project report on grocery store management system..pdfKamal Acharya
In today’s fast-changing business environment, it’s extremely important to be able to respond to client needs in the most effective and timely manner. If your customers wish to see your business online and have instant access to your products or services.
Online Grocery Store is an e-commerce website, which retails various grocery products. This project allows viewing various products available enables registered users to purchase desired products instantly using Paytm, UPI payment processor (Instant Pay) and also can place order by using Cash on Delivery (Pay Later) option. This project provides an easy access to Administrators and Managers to view orders placed using Pay Later and Instant Pay options.
In order to develop an e-commerce website, a number of Technologies must be studied and understood. These include multi-tiered architecture, server and client-side scripting techniques, implementation technologies, programming language (such as PHP, HTML, CSS, JavaScript) and MySQL relational databases. This is a project with the objective to develop a basic website where a consumer is provided with a shopping cart website and also to know about the technologies used to develop such a website.
This document will discuss each of the underlying technologies to create and implement an e- commerce website.
Welcome to WIPAC Monthly the magazine brought to you by the LinkedIn Group Water Industry Process Automation & Control.
In this month's edition, along with this month's industry news to celebrate the 13 years since the group was created we have articles including
A case study of the used of Advanced Process Control at the Wastewater Treatment works at Lleida in Spain
A look back on an article on smart wastewater networks in order to see how the industry has measured up in the interim around the adoption of Digital Transformation in the Water Industry.
Student information management system project report ii.pdfKamal Acharya
Our project explains about the student management. This project mainly explains the various actions related to student details. This project shows some ease in adding, editing and deleting the student details. It also provides a less time consuming process for viewing, adding, editing and deleting the marks of the students.
Immunizing Image Classifiers Against Localized Adversary Attacksgerogepatton
This paper addresses the vulnerability of deep learning models, particularly convolutional neural networks
(CNN)s, to adversarial attacks and presents a proactive training technique designed to counter them. We
introduce a novel volumization algorithm, which transforms 2D images into 3D volumetric representations.
When combined with 3D convolution and deep curriculum learning optimization (CLO), itsignificantly improves
the immunity of models against localized universal attacks by up to 40%. We evaluate our proposed approach
using contemporary CNN architectures and the modified Canadian Institute for Advanced Research (CIFAR-10
and CIFAR-100) and ImageNet Large Scale Visual Recognition Challenge (ILSVRC12) datasets, showcasing
accuracy improvements over previous techniques. The results indicate that the combination of the volumetric
input and curriculum learning holds significant promise for mitigating adversarial attacks without necessitating
adversary training.
Influence of Subsurface Heterogeneity on Detection of Landfill Leakage
1. Optimum Design of Groundwater
Monitoring Networks at Landfill
Sites
Nusin Buket Yenigul
Prof. Dr. C. van den Akker
Dr. A.Elfeki
Dr. J.C.Gehrels
Faculty of Civil Engineering & Geosciences
Department of Hydrology and Ecology
2. Content
Research Outline
Influence Of Uncertainty In Leak Location On Detection
of Contaminant Plumes Released At Landfill Sites
Objectives
Hypothetical Test Cases
Results of the analysis
Motivation and Objectives
Influence Of Subsurface Heterogeneity On Detection of
Landfill Leakage
Objectives
Hypothetical Test Cases
Results of the analysis
Concluding Remarks
Future Plan
3. Formulation of a methodology for the design
of an optimum monitoring well network at a
landfill site.
Motivation and Objectives
Highest probability of
contaminant detection
Cost effectiveEarly detection
4. Research Outline
Effects due to spatial heterogeneity of the subsurface
GROUNDWATER FLOW AND TRANSPORT MODEL
STOCHASTIC CHARACTERIZATION & SENSITIVITY ANALYSIS
Influences related to the uncertainties in contaminant source location
Steady state uniform flow
Transient flow
Random walk transport model
Influence of number of wells, on the detection probability
Influence of dimension of the source & detection limit on the detection probability
Influence of dispersivity of medium on the detection probability
Influence of pumping & sampling frequency on the detection probability
OPTIMIZATION
trade-off among the maximum detection probability, early detection and minimum cost.
APPLICATION OF METHODOLOGY
Application to a real case study.
FORMULATION OF GUIDELINES
5. Cooperation With
TNO
GEODELFT
TAUW
TU DELFT MATHEMATICS DEPARTMENT
Publication
Influence of Uncertainty In leak Location On Detection of
Contaminant Plumes Released at Landfill Sites
Modelcare 2002, 4th International Conference on Calibration And Reliability In
Groundwater Modelling, Praque, Czech Republic, 17-20 June 2002”
Influence of Subsurface Heterogeneity on Detection of Landfill
Leakage
CMWR 2002, 14th International Conference on Computational Methods in Water
Resources, Delft, The Netherlands, 23-28 June 2002”
6. Influence Of Uncertainty In Leak Location
On Detection Of Contaminant Plumes
Released At Landfill Sites
“Presented in Modelcare 2002”
7. uncertainties due to subsurface heterogeneity
Objectives
To Analyze The Influence Of :
uncertainties due to contaminant leak location
dispersivity of medium
number of wells in monitoring system
the initial contaminant source size
9. Steady state groundwater flow
2000 particles with a total mass of 1000 gram
Zero flux and constant head
Hydraulic gradient is 0.001
Confined aquifer
Y= ln (K) is modeled as a Gausian stationary
distribution
2
Y is set to “0”, “1” and “2” and x= x =5 m
Monte Carlo method is used to generate leak locations
Hypothetical Test Model
10. Random leak locations follow a uniform distribution
Failure is modeled as a point and a small areal source
Detection limit corresponds the detection of the first
particle hits the well
L= 0 m, T= 0 m (advection); L= 0.5 m, T= 0.15 m;
L= 1.5 m T= 0.15 m
porosity = 0.25
contaminant are assumed to be conservative
Hypothetical Test Model
11. 0
5
10
15
20
25
30
35
40
0 1 2 3 4 5 6 7 8 9 10 11
number of the wells
detectionprobability(%)
0
1
2
L=0T=0
x=y= 5 m
2
Y=
Influence of 2
Y On Monitoring Systems of 3, 5
& 10 wells for Point Contaminant Source
12. 0
5
10
15
20
25
30
35
40
0 1 2 3 4 5 6 7 8 9 10 11
number of the wells
detectionprobability(%)
0
1
2
L=0T=0
x=y= 5 m
2
Y=
Influence of 2
Y On Monitoring Systems of 3, 5
& 10 wells for Areal Contaminant Source
13. 0
10
20
30
40
50
60
70
80
90
100
0 1 2 3 4 5 6 7 8 9 10 11
number of the wells
detectionprobability(%)
L=0,T=0
L=0.5,T=0.05
L=1.5,T=0.15
Influence of Dispersivity On Monitoring Systems of
3, 5 & 10 Wells for Areal Contaminant Source
(2
Y=0)
14. Subsurface heterogeneity detection probability
Number of wells detection probability
Dispersivity of medium detection probability
Current practice (3 wells) is not sufficient.
Initial size contamination source detection probability
Results of The Analysis
15. Influence Of Subsurface Heterogeneity On
Detection Of Landfill Leakage
“Presented in CMWR 2002”
16. To analyze the spatial variability of hydraulic
conductivity on contaminant plume detection
Purpose
To characterize the subsurface heterogeneity based on
Gaussian and Non-gaussian models
The comparison of the results of two approaches
17. Hydraulic conductivity is assumed to be the major contributor to
the uncertainty
Logarithm of hydraulic conductivity (ln K) is modeled;
1) as a Gaussian stationary distribution with mean, variance and a
correlation length,
2) as a non-Gaussian distribution using a coupled Markov chain
model (CMCM).
A Monte Carlo method is used to generate multiple random hydraulic
conductivity field.
Steady state groundwater flow model
random walk transport model
Contaminants are assumed to be conservative.
L=0 m, T=0 m; L=0.5 m, T=0.05 m; L=1.5 m, T=0.15 m.
4 geological units are considered in coupled CMCM
Hypothetical Test Model
19. Unit
Color in
Figure 1
Wi Low Contrast High contrast
1 yellow 0.24 80 m/day 100 m/day
2 blue 0.25 50 m/day 10 m/day
3 red 0.31 20 m/day 1 m/day
4 green 0.20 10 m/day 0.1 m/day
Parameter Low Contrast High Contrast
Km(m/day) 39.9 26.8
K 26.7 41.2
Y=lnK 3.5 2.68
Y 0.61 1.1
x 25.0 m 25.0 m
y 2.0 m 2.0 m
Hydraulic conductivity values of the units in non-Gaussian (Markovian) field.
Estimated simulation parameters for generation of statistically equivalent
Gaussian fields.
23. Results of The Analysis
Detection probabilities in non-Gaussian and Gaussian
cases are slightly different.
Less discrete variation Gaussian stationary distribution.
Complex geology with particular features Markov model
Dispersivity of medium detection probability
24. Concluding Remarks
Detection probability of contaminant plumes highly
depends on:
subsurface heterogeneity
size of the plume
number of the wells in a monitoring system
Efficiency of 3 well system particularly in medium with
relatively low dispersivity is quite dubious
in case of less discrete variation between the
geological units, subsurface heterogeneity can be
modeled based on a Gaussian stationary distribution.
25. Future Plan of Work (2003)
Continue Calculations for Stochastic Characterization
and Sensitivity Analysis
• To create test models representing hydrogeological conditions in
east and west part of The Netherlands
• Designing of various monitoring networks to be utilized in
formulation of guidelines
• Developing an analytical approach that can provide compatible
results with the simulation model
• Analyzing the detection probability of each network to be used
in optimization model in far steps of the research
Literature study
Publications