A Study of Rainfall-Runoff Response in a Catchment Using TOPMODEL
The simplicity of Topography-based hydrological model (TOPMODEL),as a way of reflecting the topographic controls on soil water storage and runoff generation,has become more attractive and morepopular for land surface process study since digital elevation models (DEMs) have become widely available.In this paper,the effect of the topography index on soil water storage distribution,which is the key to TOPMODEL,is explained.Then a simple water cycle model for estimating other components of the surface water cycle is developed,which is implemented into the TOPMODEL to integrate the water cycle of the catchment.Using the output of a DEM from 100 m × 100 m resolution data and a single flow direction algorithm,the index distribution function is calculated for a catchment (around 2500 km2 )in the upper reaches of the Yangtze River under different channel initiation thresholds.Finally,the daily and monthly rainfall-runoff response from 1960 to 1987 for the catchment is simulated with the TOPMODEL coupled with the simple water cycle model.
作 者： 孙菽芬 邓惠平 作者单位： 孙菽芬(LASG,Institute of Atmospheric Physics,Chinese Academy of Sciences,Beijing 100029)邓惠平(Department of Geography,Liaocheng University,Liaocheng 252059)
刊 名： 大气科学进展(英文版) ISTIC SCI 英文刊名： ADVANCES IN ATMOSPHERIC SCIENCES 年，卷(期)： 2004 21(1) 分类号： 关键词： TOPMODEL runoff simulation upper reaches of the Yangtze River