基于GIS栅格系统的集水农业地表产流模拟分析

采用GIS的方法，建立了环县数字高程模型(DEM)，研究了本区地表水流方向、集流能力、子集水区的划分及水系网络空间分布等水文特征.以栅格化径流系数法为基础，模拟了该区多年平均产流量的空间分布，以及降雨量分别为10、20、30、40、50和60mm时，环县各自然集水盆地内可产生的径流量.研究结果表明，利用DEM不仅可模拟地表大型水系网络的空间分布，而且可模拟小型水道的空间走向；利用栅格化径流系数法，可快速分析子集水盆地产流量的空间分布.这些研究结果，对半干旱区集水农业工程的规划与决策具有重要的意义。

Modeling of surface runoff based on raster system in GIS for rain-harvesting agriculture

By means of GIS method, the digital elevation model (DEM) is established, the flow direction, flow accumulation, sub-catchment boundaries and stream network spatial distribution are studied. Based on raster system and Rasterized Runoff Coefficient Method (RRCM), the spatial distribution of annual average runoff is modeled. Meanwhile, the runoff in the simulated natural catchments is also simulated with the precipitation of 10, 20, 30, 40, 50 and 60mm. The results indicate that not only the spatial distribution of large stream network can be simulated but also the small water path by DEM and the runoff in each sub-catchment can be quickly calculated by RRCH. It is important in planning the rainharvesting enginneering in semi-arid area.