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TOPMODEL地形指数的计算
吴波1, 张万昌1,2
1.国际地球系统科学研究所, 江苏 南京 210093;2.中国科学院 大气物理研究所 东亚区域气候环境重点实验室, 北京 100029
摘要:
地形指数是TOPMODEL(topography index,也称湿润指数,wetness index)中一个重要的输入参数,它把流域饱和缺水量,变动产流面积的概念紧密联系起来。根据定义介绍了它的计算方法,解决了坡度为零的栅格的处理以及河道造成的地形指数值偏大的问题。并以两河口流域(2818km2)分辨率为60m的数字高程模型栅格网为例生成地形指数,配合相应的气象数据和水文资料,在TOPMODEL中进行了径流日模拟,效率在70%左右。
关键词:  地形指数  TOPMODEL  数字高程模型(DEM)  两河口
DOI:
分类号:
基金项目:国家重点基础研究发展规划项目(2006CB400502),(2001CB309404);中国科学院“百人计划”择优支持项目(8-057493);中国科学院大气物理所东亚区域气候环境重点实验室开放基金资助
Calculation of Topography Index for the TOPMODEL
WU Bo1, ZHANG Wan-chang1,2
1.International Institute of Earth System Science, Nanjing University, Nanjing 210093, Jiangxi Province, China;2.Key Laboratory of Regional Climate-Environment Research for Temperate East Asia(RCE-TEA), Chinese Academy of Sciences, Beijing 100029, China
Abstract:
Topography index (wetness index) is a crucial kind of input data,which links the saturation deficit of a basin with the conception of variable contributing area.According to the definition of topography index,procedures of calculating the index were presented.Solutions to problems of processing grids with zero slope degree and expurgated deviations induced by the involvement of channels in computation were introduced.The index was derived from the DEM of the Lianghekou Basin with a solution of 60 m in this method,and then imported into TOP-MODEL with a suitable data set.The result of daily runoff simulation turns out to be acceptable with about 70% prediction precision.
Key words:  topography index  TOPMODEL  DEM  Lianghekou Basin