Abstract: The management information system can be used in monitoring of underwater erosion and deposition. The point cloud collected by multi-beam sounding system are treated as experimental data, and the programming language of C# is integrated with the technology of ComGIS to develop the system. Now the system has been in operation at Guanyinyan hydropower station, which is proved to be reliable and effective in information extraction.

Key words: underwater terrain, erosion and deposition, storage curve, technology of ComGIS

摘要： 坝前淤积及坝后冲刷监测管理信息系统以多波束点云数据为重要数据源，采用C#结合ArcEngine组件式开发技术实现水下冲刷淤积变化的智能化监测分析。该系统已投入观音岩水电站应用，结果表明该系统在大数据水下信息挖掘和提取方面具有良好的应用价值。

关键词: 水下地形, 冲刷淤积, 库容曲线, 组件式开发