分水曲面法水库干支流划分及库容计算方法

Research on Trunk and Branch Streams Division of Reservoir by 3D Curved Surface and Capacity Calculation Method

为提高水库库容及泥沙冲淤量的计算精度,满足水库调度和工程管理的需要,针对以往多支流水库在划分汇流区干支流区域时存在的物理概念不明确、计算精度较低等问题,在大量原型观测数据分析的基础上,提出了分水曲面法的干支流区域划分的概念和作业方法,实现了在三维环境中对水库干支流区域的划分。小浪底水库应用结果表明:该方法空间概念清晰,能够真实反映库区冲淤变化和水位变化对汇流区库容的影响,大大提高水库库容和泥沙冲淤量的计算精度。同时,为水库调度和水库泥沙运动规律研究提供了直观的地形边界条件和数字高程模型。

In order to improve the reservoir storage and sedimentation calculation precision and meet the needs of reservoir operation and project management,according to the problems of dividing the confluence area,that physical concepts are not clear,the calculation results are of low accu-racy,based on the analysis of a large number of prototype observation data,this study introduced a new method of dividing main river and tributa-ries by 3D curved surfaces,and its concept and method of operation,realized the division of main river and tributaries on the reservoir in a 3D envi-ronment. The application results show that it has clear space conception,reflects the impact of water level changes on the confluence area capacity, greatly improves the precision of reservoir storage and sedimentation volume calculation,and at the same time provides the boundary conditions and terrain digital elevation model for reservoir operation and the study of sediment movement of reservoir.