一种基于DEM的入库洪水及坝址洪水计算方法  

Computational Method for Reservoir and Dam Site Flood Based on Digital Elevation Model

作　　者：孔凡哲[1] 韩继伟[1] 赵磊[1] 

机构地区：[1]中国矿业大学资源与地球科学学院,江苏徐州221116

出　　处：《水电能源科学》2012年第3期55-57,213,共4页Water Resources and Power

基　　金：国家自然科学基金资助项目(50309002)

摘　　要：针对现行水库洪水预报方法存在的问题,提出了一种基于DEM的入库洪水及建库后坝址洪水计算方法,计算了进入库面边界的区间入库单位线、均匀进入库面边界的1个单位水量在坝址处形成的无因子单位线、考虑汇流时间的库面降雨在坝址处形成的单位线及区间入库单位线与无因子单位线卷积后得到的区间净雨在坝址处形成的单位线,确定了入库洪水流量过程和坝址处总洪水流量过程,并以燕山水库为例,利用HEC-HMS模型系统模拟了其入库及坝址洪水过程,计算结果与实际情况相吻合。Aiming at the shortcomings of current reservoir flood forecasting, a computational method for reservoir flood and dam site flood is proposed in terms of digital elevation model （DEM）. This technique computes the unit hydrograph （UH） of reservoir surface boundary, the dimensionless UH of dam site formed by unit inflow of reservoir surface boundary, the UH of dam site by rainfall on reservoir surface with concentration time. It also calculates the UH at the dam site formed by net regional rainfall, which is obtained by convoluting the UH into reservoir surface boundary and the dimensionless UH. Finally, the total flood hydrographs of reservoir and dam site is determined. Taking Yanshan reser voir for an example, HEC-HMS model is used to simulate the reservoir inflow and dam site hydrographs and the results accord with actual situation.

关 键 词：DEM 入库洪水 坝址洪水 单位线 

分 类 号：P338.9[天文地球—水文科学]