| Title |
Improving HSPF Model`s Hydraulic Accuracy with FTABLES Based on Surveyed Cross Sections |
| DOI |
https://doi.org/10.15681/KSWE.2016.32.6.582 |
| Keywords |
FTABLE; HEC-RAS; HSPF; Hydraulics; Rating curves; Surveyed cross section |
| Abstract |
The hydrological simulation program-FORTRAN (HSPF) is a comprehensive watershed model that employs depth-area- volume-flow relationships knows as the hydraulic function table (FTABLE) to represent the geometric and hydraulic properties of water bodies. The HSPF model`s hydraulic representation mainly depends on the accuracy of the FTABLES and the hydraulic representation determines the respond time of water quality state variables and also control scour, deposition, and transport of sediments in the water body. In general, FTABLES are automatically generated based on reach information such as mean depth, mean width, length, and slope along with a set of standard assumptions about channel geometry and hydraulics, so these FTABLES can`t describe accurately the geometry and hydraulic behavior of rivers and reservoirs. In order to compensate the weakness of HSPF for hydraulic modeling, we have generated alternative methods to improve the accuracy of FTABLES for rivers using the surveyed cross sections and rating curves. The alternative method based on the hydraulics simulated by HEC-RAS using the surveyed cross sections and rating curves could improve significantly the accuracy of FTABLES. The alternative FTABLE could improve greatly the HSPF model`s hydraulic accuracy but had little effect on the hydrological simulation. |