Author(s): Ming Jin; Janice Sylvestre

Linked Author(s): Ming Jin

Keywords: No Keywords

Abstract: The National Weather Service hydrodynamic flood routing model, FLDWAV, has been applied to the Mississippi-Illinois-Missouri river system and implemented in the National Weather Service River Forecast System (NWSRFS) to produce the day-to-day river flood forecasts of the river system. The FLDWAV model uses the discharges generated from hydrologic models in NWSRFS as its upstream boundary condition, as lateral flows for tributaries which are not modeled dynamically, and for local runoff. The computational accuracy of the FLDWAV model depends not only on the calibrated channel roughness coefficients (Manning's n), but also on the real time accuracy of the input discharges generated by hydrologic models. It has been found that the discharges from the hydrologic models sometimes may have significant errors, particularly in ungaged drainage areas, causing large errors in the computational results of the FLDWAV model. A study is undertaken to use FLDWAV to identify the discharge errors and develop an algorithm to perform real-time corrections to the discharges which results in improved river stage forecasts. Preliminary results show that significant improvement can be achieved by this discharge updating technique and some results are reported in this paper.

DOI:

Year: 2001