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

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Presentation on theme: "HEC-HMS Hydrologic Modeling on Lower Colorado Basin Ki-Weon Seo."— Presentation transcript:

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 1. Loss Rate - Initial and Constant - SCS Curve Number 2. Transform - Snyders Unit Hydrograph 3. Base flow - No base flow 4. Routing - Lag and Muskingum

8 Basin Model

9

10 Meteorologic Model 1. Precipitation - Nov/01/2000 ~ Nov/06/ 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

16 Initial and Constant(with calibration)

17

18 SCS CN(with calibration)

19

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


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