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Groundwater Modeling Study case : Central Plain of Thailand

Groundwater Modeling Study case : Central Plain of Thailand. December 16, 2009. Werapol Bejranonda Department of Geohydraulics and Engineering Hydrology University of Kassel, Germany. Contents. Study Area / Groundwater hydro. Methodology Groundwater Modeling Application of the model.

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Groundwater Modeling Study case : Central Plain of Thailand

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  1. Groundwater ModelingStudy case : Central Plain of Thailand December 16, 2009 WerapolBejranonda Department of Geohydraulics and Engineering Hydrology University of Kassel, Germany

  2. Contents • Study Area / Groundwater hydro. • Methodology • Groundwater Modeling • Application of the model

  3. Geological Map of Thailand Study Area • Upper Central GW Basin • of great central basin • Agricultural Bangkok (Capital) *The first upper central regional GW Model • Lower Central GW Basin • of great central basin • Industrial • Agricultural Hydrogeological map of upper central GW basin GW Basins

  4. Study Area Study Area Boundary • 4 Main Streams • Yom Rive • Nan River • Ping River • Sakaekrang River cover 5 main surface-water basins Surface Water

  5. Study Area UTD SKT PSL KPP PCT 47,000 km2 NKS Project study area covers 6 Provinces

  6. Existing Conjunctive Use • Irrigation area • Rainfed area • Personal GW pumps

  7. Study flowchart

  8. GW use ??Field data collection (pumping behavior)

  9. Layer Classification Flood Deposit & Low Terrain High Terrain

  10. GW Model (MODFLOW) 2 Layers Conceptual Model 10 km. Upper : 320 grids Lower : 346 grids 10 km Upper Layer(Semi-confined) Lower Layer(Confined)

  11. Recent Flood Plain Deposits Low Terrace Deposits High Terrace Deposits Rock Upper Layer thickness 40-100 m. Lower Layer thickness 100-300 m.

  12. Calculation Method • Steady Calibration : 2003 • Transient Calibration : 1993-2003 • Model Verification :2003-2005 1.Steady Statefor Hydraulic Conductivity 2.Transient State for Specific Storage 1993 2003 2005 3.Verification

  13. Calibration & Verification Steady Transient

  14. Space Dimension GW Use Ratios Time Dimension

  15. Surface and Groundwater Use Conjunctive Use Patterns Ratio of Groundwater Use to total water demand

  16. Different GW Level from Calculation Approach

  17. Application#1 : GW Level in pilot areaGW yield awareness Agricultural well yield Simulated as Drought year

  18. 2005 Application#2 :Regional GW table 2018 Simulatedgroundwater table using conjunctive use ratio 2003 2026

  19. Questions & Answers

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