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Linking Hydrologic and Hydraulic Routing Models in Low Relief Basins of South Florida

by Jayantha Obeysekera, South Florida Water Management, District, West Palm Beach, United States,
Robert Barkau, South Florida Water Management, District, West Palm Beach, United States,
Carlos de Rojas, South Florida Water Management, District, West Palm Beach, United States,



Document Type: Proceeding Paper

Part of: Engineering Hydrology

Abstract:

Combined use of hydrologic and hydraulic routing models to analyze the rainfall-runoff processes during a storm event is a common practice. In this approach, a hydrologic model is employed to simulate the rainfall-runoff process in sub-basins and a hydraulic channel routing model is used to simulate the unsteady flow through the drainage network. Because of the backwater effects in low-relief coastal basins, the hydrologic and hydraulic models can not be used independently. A feedback mechanism is needed to account for tailwater effects on the runoff hydrograph generated by the hydrologic model. A system of two models which properly account for the tailwater effects is presented in this paper. The usage of the models has been made convenient by incorporating the Data Storage System (DSS) developed by the Hydrologic Engineering Center of the U.S. Army Corps of Engineers. The models are designed for both IBM compatible personal computers and workstations and they employ the DISPLAY package of DSS for graphical display of rainfall hyetographs, stage and discharge hydrographs. A brief description of the models and their application to a realistic hypothetical example which illustrates the iterative linkage of models is presented. The application to a complex drainage network in the Hillsboro canal basin, Broward County, Florida is also reported.

Subject Headings: Hydrologic models | Hydraulic models | Computer models | Simulation models | Rainfall-runoff relationships | Hydraulic networks | Runoff | Florida | United States

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