Evaluation of Diffusion Models for Flood Routing

by Larry M. Younkin, Bucknell Univ, United States,
William H. Merkel, Bucknell Univ, United States,

Document Type: Proceeding Paper

Part of: Hydraulic Engineering


A study has been conducted to define the range of conditions with respect to hydrographs and channels encountered by SCS engineers in flood plain/flood control projects and to test two diffusion flood routing models against a benchmark full dynamic routing model. A total of 340 routing tests were performed. The accuracies of predicting peak discharge, peak area, time of peaks, and correlation of hydrograph shapes were analyzed and related to nondimensional parameters that describe the range of field conditions. Both diffusion models were found to satisfy accuracy criteria for over 80 per cent of the SCS field conditions. The variable parameter diffusion model provides greater accuracy only in retaining the shape of the hydrographs.

Subject Headings: Flood routing | Model accuracy | Dynamic models | Diffusion | Hydrologic models | Channel flow | Water flow | Water discharge | South Carolina | United States

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