HECHMS Hydrologic Modeling on Lower Colorado Basin KiWeon
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 La. Grange (4) Colorado river at Wharton
Real data - 3 Discharge gages (1) Onion creek at US Hwy 183 (2) Colorado river above La. Grange (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 La. Grange Optimization Schematic
Calibrating at La. Grange Objective function value
Calibrating at La. Grange Simulated and observed hydrographs
Calibrating at La. Grange Scatter graph of simulated and observed hydrographs
Calibrating at La. Grange 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
- Slides: 31