Application of a Surface Runoff and Groundwater Coupled Model to Xitiaoxi Catchment

LI Li-jiao1,2,ZHANG Qi1, (1.State Key Laboratory of Lake Science and Environment,Nanjing Institute of Geography & Limnology,Chinese Academy of Sciences,Nanjing,Jiangsu 210008;2.Graduate University of Chinese Academy of Sciences,Beijing 100039)

interaction of surface runoff and groundwater;distributed hydrological model;Xitiaoxi catchment

A distributed fully-coupled surface runoff and groundwater model was developed to account for interactions and water exchange between surface runoff,soil water and groundwater.This model was applied to Xitiaoxi catchment with a discretization of 1 km×1 km grids.Predicted stream flows were compared with the observed ones at Hengtangcun and Fanjiacun gauging stations for 1988-2001 with the calibrated parameters.The model was evaluated by its prediction precision,number of parameters needed,model execution stability and water budget analysis.Results indicate that compared to other models,the current model has less parameters,especially for soil data,which makes the model more applicable to areas where data are limited.The model runs steadily with a satisfactory accuracy of predictions.The comprehensive water budget analysis output from the model can be useful in quantitatively assessing the contributions of different flow components to the total stream discharge.The model can be a useful tool for investigation of the interactions between surface runoff and groundwater,and for water balance analysis and water resources management.