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# DSD-SEA 2019 Mathematical Modelling for Enhancement of Water Management and Monitoring of Coastal Polders-Islam

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Presentation by Mr. Md. Saiful Islam, Bangladesh University of Engineering & Technology (BUET), at the Seminar Hydro Software to support policy development and real-time decision making, during the Deltares Software Days South-East Asia 2019. Wednesday, 27 November 2019, Bangkok.

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### DSD-SEA 2019 Mathematical Modelling for Enhancement of Water Management and Monitoring of Coastal Polders-Islam

1. 1. MATHEMATICAL MODELLING FOR ENHANCEMENT OF WATER MANAGEMENT AND MONITORING OF COASTAL POLDERS November 2019 Md. Saiful Islam Associate Specialist Coast, Port and Estuary Management Division (CPE) Institute of Water Modelling (IWM) Email: mds@iwmbd.org Dr. Kymo Slager Expert in Climate Adaptation and Risk Deltares Email: kymo.slager@deltares.nl
2. 2. ❑Understand the Physical Process of the Existing Water Management System ❑Development of Low-Cost Water Monitoring System ❑Prioritization of Local needs for the Improved Water Management System ❑Development of WaterApps for the betterment of the Water Management of coastal community ❑Capacity Building of the Local Community ❑Up-Scalling Planning of Water Management Knowledge and Innovation Program (WMKIP)
4. 4. Components of Polder ❑Infrastructure ❖Peripheral River; ❖Embankment; ❖Khal; ❖Regulators (Drainage and Flushing); ❖Pipe Inlet; ❖Road; ❖Bridges; ❖Culvert; ❑Agriculture; ❑Fish Culture; Components of a Coastal Polders
5. 5. Concept for Development of Proper Water Management System ❑ Multiple Interaction Meetings ❑ Implementation of Unique Low-cost Monitoring Network ❑ Extensive Surveys and Data collection of Water System ❑ Water system analysis and Hydrodynamic Modelling ❑ Training of apps use to WMGs ❑ Develop Model for Upscaling Community ConsultationDecision making by WMGs Community Participation Community Training Mobile Distribution Community MappingMethodology
6. 6. Sluice gate operator Staff gauge reader Participatory Water Monitoring System WMG Capacity Building
7. 7. Weather station Multiflexmeter o Cross Sections of all internal Drainage Channels o Structure Information o Road Crest Level Monitoring Network Extensive Survey Work Staff Gauge and Pressure divers Pressure divers
8. 8. Development of Mathematical Model by SOBEK 2 Hydrological Model & Hydrodynamic Model
9. 9. Calculations ❖Mean Aerial Rainfall ❖Mean Aerial Evaporation Outcome ➢ Runoff at each Catchment Runoff at Amkhola Development of Hydrological Model for Polder 43/2B Data Requirement ❑Rainfall ❑Evaporation ❑Catchment Area ❑Rainfall Station influence factor ❑Soil Characteristics Rainfall Evaporation Catchment Hydrological Model
10. 10. Input Parameters ❑Network ❑Cross Sections ❑HD Parameters ❑HD Boundaries ❑Rainfall-Runoff Development of Hydrodynamic Model for Polder 43/2B Drainage Channel Network Drainage Channel Cross Sections Typical Cross Section of Amkhola Channel Hydrodynamic Parameters ❑Initial Condition ❑Bed Resistance (calibration parameter)
11. 11. Boundary Conditions Two Open Boundaries ❑Downstream Boundaries Time Series Water Level at Galachipa River Time Series Rainfall-Runoff o contribution of Rainfall-Runoff ❑Upstream Boundaries (Flow) o Constant Discharge Development of Hydrodynamic Model for Polder 43/2B
12. 12. Simulation of Water Control Structures Amkhola Regulator 2V-1.5x1.8 (Operation) Mushurikhati Regulator 2V-1.5x1.8 (Broken) Bauria Regulator 2V-1.5x1.8 Masuakhali Regulator 2V-1.5x1.8 (Closed) Badura Regulator 2V-1.5x1.8 (Drainage) Nosaishing Regulator 2V-1.5x1.8 (Closed) -1.90 1.85 -0.05 US WL DS WL Drainage Operation -2.00 -1.80 -1.60 -1.40 -1.20 -1.00 -0.80 -0.60 -0.40 -0.20 0.00 0.20 0.40 -10 -9 -8 -7 -6 -5 -4 -3 -2 -1 0 1 2 3 4 5 6 7 8 9 10 GateLevel(mPWD) Head Difference (m) Gate Level (function as Drainage Regulator) Sill Level Drainage Regulator -1.74 1.85 +0.11 US WL DS WL Open Regulator -2.00 -1.80 -1.60 -1.40 -1.20 -1.00 -0.80 -0.60 -0.40 -0.20 0.00 0.20 0.40 -10 -9 -8 -7 -6 -5 -4 -3 -2 -1 0 1 2 3 4 5 6 7 8 9 10 GateLevel(mPWD) Head Difference (m) Gate Level (function as Open Regulator) Sill Level Broken Regulator Development of Hydrodynamic Model for Polder 43/2B
13. 13. Simulation of Water Control Structures Amkhola Regulator 2V-1.5x1.8 (Operation) Mushurikhati Regulator 2V-1.5x1.8 (Broken) Bauria Regulator 2V-1.5x1.8 Masuakhali Regulator 2V-1.5x1.8 (Closed) Badura Regulator 2V-1.5x1.8 (Drainage) Nosaishing Regulator 2V-1.5x1.8 (Closed) Time Step Gate Operation Level Time Step Gate Operation Level Time Step Gate Operation Level Time Step Gate Operation Level 1920.5 -0.64 2040.5 -1.56 2040 0.29 2040 0.29 3168 -0.64 3455.5 -1.56 3119.5 0.29 3119.5 0.29 3168.5 -0.64 3456 0.29 3120 -1.56 3120 -1.56 3455.5 -0.64 3600 0.29 3455.5 -1.56 3455.5 -1.56 3456 0.29 3600.5 -1.56 3456 0.29 3456 0.29 3600 0.29 3911.5 -1.56 3623.5 0.29 3623.5 0.29 3600.5 -0.64 3624 -1.56 3624 -1.56 3936 -0.64 3911.5 -1.56 3911.5 -1.56 Amkhola River Side-1 Amkhola River Side-2 Amkhola Polder Side-1 Amkhola Polder Side-2 -1.8 -1.6 -1.4 -1.2 -1 -0.8 -0.6 -0.4 -0.2 0 0.2 0.4 0.6 0.8 1 0 500 1000 1500 2000 2500 3000 3500 4000 4500 5000 5500 6000 6500 InvertLevel(mPWD) TIme Step (Hrs) Amkhola Gate Operation Amkhola River Side-1 Amkhola River Side-2 Amkhola Polder Side-1 Amkhola Polder Side-2 Amkhola Regulator Operation by Real Time Control
14. 14. Simulation of Culverts Simulation of Earthen Cross Dams Simulation of Local Effects (Cross Dams, Water Withdrawal, Gate Operation) Simulation of Cross Dams with flowing channel Simulation of Gate Operation Development of Hydrodynamic Model for Polder 43/2B
15. 15. With Gate Operations Calibration of Hydrodynamic Model Calibration of Water Level ❑ Gate Operation Rule ❑ Cross Dam Operation ❑ Water Withdrawal Effects ❑ Functioning of Culverts With all Local Effects Simulation of Local Effects
16. 16. Calibration of Water Level at Staff Gauges and Multiflexmeter Locations Calibration of Multiflexmeters Measurements Calibration of Staff Gauge Measurements Calibration of Hydrodynamic Model
17. 17. Developmed of Proper Water Management Concept Community Consultation Decision making by WMGs
18. 18. Regulator Manager: to support decision- making on optimal timing to operate the sluice gate (based on Crop Water Curve) Multiflexmeter Development of Concept for Developing Mobile Apps (Regulator Manager)
19. 19. Polder Planner Apps Polder Water Planner: to support decision-making on the implementation of measures Potential Measure ❑ Remove Cross Dams ❑ Khal Excavation ❑ Gate Culvert Season ❑ Dry ❑ Average ❑ Wet
20. 20. Development of Concept for Developing Mobile Apps (Khal Excavator) Khal Excavator: to estimate labour demands and cost for excavating khals Upstream Middle Downstream Lengthkhal a. b. c. Khal width
21. 21. THANK YOU FOR YOUR TIME