HEC-HMS

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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
   (4)   Colorado river at Wharton
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
Working with Project
Basin Model
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
Basin Model
Basin Model
Meteorologic Model

   1. Precipitation
      - Nov/01/2000 ~ Nov/06/2000

   2. Evaportranspiration
      - No evaportranspiration
Meteorologic Model
Discharge
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.
Initial and Constant(without calibration)
Initial and Constant(without calibration)
Initial and Constant(with calibration)
Initial and Constant(with calibration)
SCS CN(with calibration)
SCS CN(with calibration)
Calibrating at Wharton
Optimization Schematic
Calibrating at Wharton
Objective function value
Calibrating at Wharton
Simulated and observed hydrographs
Calibrating at Wharton
 Scatter graph of simulated and observed hydrographs
Calibrating at Wharton
 Residual graph of simulated and observed hydrographs
Calibrating at LaGrange
Optimization Schematic
Calibrating at LaGrange
Objective function value
Calibrating at LaGrange
Simulated and observed hydrographs
Calibrating at LaGrange
 Scatter graph of simulated and observed hydrographs
Calibrating at LaGrange
 Residual graph of simulated and observed hydrographs
Discussion

 . SCS CN method is recommended

 . We need more data for Muskingum

 . Calibration at each subbasin will improve the results
acknowledgment

• Sarah Stone
• Chris Riley

				
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