摘要
在水文模拟中,地形指数ln(α/tanβ)作为反映地形信息的物理指标具有很高的应用价值。应用基于DEM的River Tools软件和GRIDATB程序,对红壤丘陵区地形起伏平缓的小流域进行地形指数的提取。River Tools软件和GRIDATB程序分别使用目前常用的D8方法(单流向法)和多流向法。结果表明:与多流向法相比,D8方法的计算值较为离散,分布曲线较粗糙,平均值略高,方差和偏态系数也较大;但是,两种方法计算的ln(α/tanβ)的分布曲线大致相似。对于仅需要ln(α/tanβ)频率分布的水文模型(如TOPMODEL)来说,可以用单流向法取代多流向法来计算ln(α/tanβ)的频率分布。
As a physical index to express the information of topography in hydrological modeling, topographic index, In（α/tan β） has a high application value. River Tools and GRIDATB programs are used to compute the spatial distribution of In（α/tan β） in the small watershed in red-soil hilly region with moderate topography based on DEM. They use D8 and MFD algorithms respectively. The results show that values of In（α/tan β） computed with the D8 algorithm are more discrete and have rougher pattern than those computed with the MFD algorithm, and the mean values of In（α/tan β） with D8 algorithm are slightly higher than those with the MFD algorithm. Compared to the D8 algorithm, the variances and skews of the distributions with the MFD algorithm are lower. However, the spatial distribution of In（α/tan β） values with the D8 algorithm looks similar to that with the MFD algorithm. For some hydrographic models, such as TOPMODEL, the D8 algorithm can be used to compute the spatial distribution of In（α/tan β） instead of the MFD algorithm.
出处
《长江流域资源与环境》
CAS
CSSCI
CSCD
北大核心
2005年第6期715-719,共5页
Resources and Environment in the Yangtze Basin
基金
中国科学院知识创新工程重要方向项目(KZCX3-SW-441)
中国科学院知识创新工程领域前沿项目(01200220055413)
中国科学院"院长奖获得者科研启动专项资金"资助
