流域空间离散化及其对径流过程模拟的影响研究

本文分析比较了流域空间离散化的两种途径 :子流域法和网格法 ,并以此对流域径流过程模拟的影响进行了探讨。结果表明空间尺度和时间尺度之间应该是相互关联、相互匹配的 ;时空尺度具体大小的选定要根据研究目的、研究区域的面积、流域下扩建面信息源和模型输入资料的可获性综合考虑。

Spatial discretization of watershed and its influence on runoff simulation

Two commonly used methods of watershed segmentation were compared and analyzed. One is subarea method, and the other is grid method. Also the influence of those two methods on runoff modeling over a catchment was investigated. It is shown that spatial scale should interrelate and match with temporal scale, the selection of spatiotemporal scales for hydrological processes modeling depends upon research purpose, size of study area, sources of information within a basin and avilability of input data. Finally the Shiguanhe river catchment was selected as an example to show the effect of spatial partitioning on daily discharge simulation at the outlet.