HEC-RAS系统由美国陆军工程师兵团水力工程中心(HEC)开发研制,本软件能进行一维恒定流、非恒定流以及泥沙输移的计算。HEC-RAS现行版本只能进行恒定流的计算,新版将增加非恒定流和泥沙输移计算功能。本软件是水力工程中心“下一代”水力工程软件开发的一部分。“下一代”软件计划包括水力工程的若干方面:雨水径流分析、河流水力学、水库系统模拟、洪灾损失分析以及河流实时预报等。HEC-RAS系统是为在多用途、多用户网络环境中交互使用而研制开发的一种综合软件 HEC-RAS system by the United States Army Corps Hydraulic Engineering Center (HEC) developed by the software, the software can be one-dimensional constant flow, unsteady flow and sediment transport calculations. The current version of HEC-RAS can only calculate constant flow, the new version will increase the unsteady flow and sediment transport calculation. This software is part of the hydraulic engineering center “next generation” hydraulic engineering software development. The Next Generation software program includes several aspects of hydraulic engineering: stormwater runoff analysis, river hydraulics, reservoir system simulation, flood damage analysis, and river real-time forecasting. HEC-RAS system is a comprehensive software developed for mutual use in multi-purpose, multi-user network environment