HEC-RAS (Hydrologic Engineering Center - River Analysis System)

This software allows the user to perform one-dimensional steady flow, one and two-dimensional unsteady flow calculations, sediment transport/mobile bed computations, and water temperature/water quality modeling.

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Initial contribute: 2020-06-24

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Application-focused categoriesNatural-perspectiveLand regions

Detailed Description

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HEC-RAS is designed to perform one and two-dimensional hydraulic calculations for a full network of natural and constructed channels. The following is a description of the major capabilities of HEC-RAS.

User Interface

The user interacts with HEC-RAS through a graphical user interface (GUI). The main focus in the design of the interface was to make it easy to use the software, while still maintaining a high level of efficiency for the user.

Hydraulic Analysis Components

The HEC-RAS system contains several river analysis components for: (1) steady flow water surface profile computations; (2) one- and two-dimensional unsteady flow simulation; (3) movable boundary sediment transport computations; and (4) water quality analysis. A key element is, that all four components use a common geometric data representation and common geometric and hydraulic computation routines. In addition to these river analysis components, the system contains several hydraulic design features that can be invoked once the basic water surface profiles are computed.

Steady Flow Water Surface Profiles

This component of the modeling system is intended for calculating water surface profiles for steady gradually varied flow. The system can handle a full network of channels, a dendritic system, or a single river reach. The steady flow component is capable of modeling subcritical, supercritical, and mixed flow regimes water surface profiles.

         One- and Two-Dimensional Unsteady Flow Simulation

         This component of the HEC-RAS modeling system is capable of simulating one-dimensional; two-dimensional; and combined one/two-dimensional unsteady flow through a full network of open channels, floodplains, and alluvial fans. The unsteady flow component can be used to performed subcritical, supercritical, and mixed flow regime (subcritical, supercritical, hydraulic jumps, and draw

downs) calculations in the unsteady flow computations module.

        Steady Transport/Movable Boundary Computations

This component of the modeling system is intended for the simulation of one-dimensional sediment transport/movable boundary calculations resulting from scour and deposition over moderate time periods (typically years, although applications to single flood events are possible).

Water Quality Analysis

This component of the modeling system is intended to allow the user to perform riverine water quality analyses. An advection-dispersion module is included with this version of HEC–RAS, adding the capability to model water temperature.

模型元数据

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U.S. Army Corps of Engineers Hydrologic Engineering Center (2020). HEC-RAS (Hydrologic Engineering Center - River Analysis System), Model Item, OpenGMS, https://geomodeling.njnu.edu.cn/modelItem/c8b0cfca-07be-4868-9a7f-9d671a75e595
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History

Last modifier
Yue Songshan
Last modify time
2021-01-02
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Contributor(s)

Initial contribute : 2020-06-24

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Authorship

:  
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History

Last modifier
Yue Songshan
Last modify time
2021-01-02
Modify times
View History

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