HEC River Analysis System (HEC-RAS)by Vernon Bonner, (M.ASCE), Hydrologic Engineering Cent, Davis, United States,
Gary Brunner, Hydrologic Engineering Cent, Davis, United States,
Mark Jensen, Hydrologic Engineering Cent, Davis, United States,
Abstract: The Hydrologic Engineering Center (HEC) is developing next generation software for one-dimensional river hydraulics. The HEC-RAS River Analysis System (HEC, 1994) is intended to be the successor to the current steady-flow HEC-2 Water Surface Profiles Program (HEC, 1990a) as well as provide unsteady flow, sediment transport, and hydraulic design capabilities. A common data representation of a river network is used by all modeling methods, thus allowing the user to more easily migrate from steady-flow to other one-dimensional flow calculations. The concept also provides a consistent usage of data among the modeling methods. The HEC-RAS beta version provides a steady-flow model with several significant advances over HEC-2. An overview of the program package is provided. The Version 1.0 steady-flow model is targeted to be released by year-end, and unsteady-flow capability is planned for the following year.
Subject Headings: System analysis | Computer software | Steady flow | Sediment transport | Data processing | Rivers and streams | River systems | Hydraulic models
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