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HEC-HMS

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  1. HEC-HMS Hydrologic Modeling on Lower Colorado Basin Ki-Weon Seo

  2. Study Area-Lower Colorado Basin

  3. Real data • Nov/01/2000 ~ Nov/06/2000 (Hourly data) • 4 Precipitation gages (1) Town lake near Longhorn dam (2) Buckners creek near muldoon (3) Colorado river above LaGrange (4) Colorado river at Wharton

  4. Real data • 3 Discharge gages (1) Onion creek at US Hwy 183 (2) Colorado river above LaGrange (3) Colorado river at Wharton • Source Town lake near Longhorn dam

  5. Working with Project

  6. Basin Model

  7. Basin Model 1. Loss Rate - Initial and Constant - SCS Curve Number 2. Transform - Snyder’s Unit Hydrograph 3. Base flow - No base flow 4. Routing - Lag and Muskingum

  8. Basin Model

  9. Basin Model

  10. Meteorologic Model 1. Precipitation - Nov/01/2000 ~ Nov/06/2000 2. Evaportranspiration - No evaportranspiration

  11. Meteorologic Model

  12. Discharge

  13. Result • Initial and Constant Loss Rate (1) Calibrating Muskingum k and x (2) Calibrating Initial and Constant Loss rate • SCS Curve Number (1) Calibrating SCS CN.

  14. Initial and Constant(without calibration)

  15. Initial and Constant(without calibration)

  16. Initial and Constant(with calibration)

  17. Initial and Constant(with calibration)

  18. SCS CN(with calibration)

  19. SCS CN(with calibration)

  20. Calibrating at Wharton Optimization Schematic

  21. Calibrating at Wharton Objective function value

  22. Calibrating at Wharton Simulated and observed hydrographs

  23. Calibrating at Wharton Scatter graph of simulated and observed hydrographs

  24. Calibrating at Wharton Residual graph of simulated and observed hydrographs

  25. Calibrating at LaGrange Optimization Schematic

  26. Calibrating at LaGrange Objective function value

  27. Calibrating at LaGrange Simulated and observed hydrographs

  28. Calibrating at LaGrange Scatter graph of simulated and observed hydrographs

  29. Calibrating at LaGrange Residual graph of simulated and observed hydrographs

  30. Discussion . SCS CN method is recommended . We need more data for Muskingum . Calibration at each subbasin will improve the results

  31. acknowledgment • Sarah Stone • Chris Riley