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A Case Study of Finite-Element Numerical Modeling on Salt Water Intrusion for the Ping-Tung Plain

A Case Study of Finite-Element Numerical Modeling on Salt Water Intrusion for the Ping-Tung Plain Jing-Yea Yang, Ph.D., P.E. Stanley Consultants Inc. A. A '. A '. ▀. #2. ▀. B '. #1. ▀. #3. B. ▀. #4. #5. ▀. Major Streams Showing Gaining, Losing, and Neutral Boundary Types.

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A Case Study of Finite-Element Numerical Modeling on Salt Water Intrusion for the Ping-Tung Plain

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  1. A Case Study of Finite-Element Numerical Modeling on Salt Water Intrusion for the Ping-Tung Plain Jing-Yea Yang, Ph.D., P.E. Stanley Consultants Inc.

  2. A A' A' ▀ #2 ▀ B' #1 ▀ #3 B ▀ #4 #5 ▀ Major Streams Showing Gaining, Losing, and Neutral Boundary Types

  3. Conceptual Cross Section through Proposed Dam/Reservoir at Mei Nanu

  4. Conceptual Cross Section through Proposed Dam/Reservoir at Ma Chia

  5. PROJECT OVERVIEW GOAL Development of Numerical Model as a tool for Strategic Long-Term Management of both Groundwater and Surface Water Resources.

  6. PHASED SCOPES PHASE I: CONCEPTUAL MODELING PHASE II: DEVELOPMENT OF NUMERICAL MODEL PHASE III: SIMULATION OF RESERVOIR/WEIR CONSTRUCTION EFFECTS PHASE IV: SIMULATION OF SALTWATER INTRUSION

  7. Aquifer Hydraulic Conductivities in the Upper Aquifer, Including Both Unconfined and Confined

  8. Fence Diagram

  9. FEMWATER 9070 triangular elements 5291 nodes Mesh extended offshore to include shelf area Visualized in 3D Using GMS developed by US DOD Finite-Element Numerical Model

  10. Soil Types

  11. Numerical Model Mesh and Boundary Conditions

  12. Constant Concentrations Constant Heads Rainfall Pumping Boundary Conditions

  13. Model Water Levels

  14. Chloride Extent in Groundwater

  15. Calibrated Chloride Concentrations

  16. Simulation Results

  17. CONCLUSION • The advancing chloride front will move North. • Deeper aquifers in the areas near the mouths of the Kaoping and Tung Kang Creeks will experience increases in Cl¯. • Shallow Aquifers already have significant damage. • The rate of increase in Cl¯ is lower in SE part. • Cl¯ will increase with well depth. • The fisheries industry is the major cause of seawater intrusion.

  18. Questions…. ?

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