摘要
分布式水文模型都建立在基于DEM的地形分析基础上,因而DEM分辨率对径流模拟的影响十分显著。以资水流域的新宁站集水区为研究对象,计算了该区域地形复杂度指数空间分布,分析了降雨和地形空间变化的相互作用对不同DEM分辨率下水文模拟的影响。结果表明,DEM分辨率对流量过程的影响取决于暴雨中心所在地区的地形复杂程度。当暴雨中心所在的区域地形变化剧烈,复杂程度较高时,此时DEM空间分辨率对径流模拟的影响十分明显,不同DEM分辨率下的洪水过程模拟精度差异显著;若暴雨中心所在的区域地形变化一致或比较平坦时,此时径流模拟精度对DEM分辨率的变化不敏感。以上结论对于进一步解决水文过程中的尺度问题提供了理论分析基础。
Because the distributed hydrologic models are always developed based on terrain analysis of DEM,the effect of DEM resolution is remarkable on runoff simulation.The contributing area controlled by Xinning station of ZIshui watershed is selected for study.The terrain complexity index is computed to describe the complexity and variation of true surface.The influence of the interplay of the precipitation and terrain distribution variation on runoff simulation with different DEM resolution is examined.The results show that the effect of DEM resolution is limited by the terrain complexity of the storm centre.The effect of the DEM resolution on runoff simulation is obvious when the terrain of the storm centre is complex and varied remarkably,vice versa.These conclusions are useful for the further research of the hydrologic scale issue.
出处
《水土保持研究》
CSCD
北大核心
2010年第1期35-39,共5页
Research of Soil and Water Conservation
基金
国家水体污染控制与治理科技重大专项(项目编号2009ZX07210-004-04)
