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

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Presentation Transcript
hec hms

HEC-HMS

Hydrologic Modeling on Lower Colorado Basin

Ki-Weon Seo

real data
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

real data4
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

basin model7
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

meteorologic model
Meteorologic Model

1. Precipitation

- Nov/01/2000 ~ Nov/06/2000

2. Evaportranspiration

- No evaportranspiration

result
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.

calibrating at wharton
Calibrating at Wharton

Optimization Schematic

calibrating at wharton21
Calibrating at Wharton

Objective function value

calibrating at wharton22
Calibrating at Wharton

Simulated and observed hydrographs

calibrating at wharton23
Calibrating at Wharton

Scatter graph of simulated and observed hydrographs

calibrating at wharton24
Calibrating at Wharton

Residual graph of simulated and observed hydrographs

calibrating at lagrange
Calibrating at LaGrange

Optimization Schematic

calibrating at lagrange26
Calibrating at LaGrange

Objective function value

calibrating at lagrange27
Calibrating at LaGrange

Simulated and observed hydrographs

calibrating at lagrange28
Calibrating at LaGrange

Scatter graph of simulated and observed hydrographs

calibrating at lagrange29
Calibrating at LaGrange

Residual graph of simulated and observed hydrographs

discussion
Discussion

. SCS CN method is recommended

. We need more data for Muskingum

. Calibration at each subbasin will improve the results

acknowledgment
acknowledgment
  • Sarah Stone
  • Chris Riley