Land Surface-Hydrology Coupled Model:Establishing and Applying to the Huaihe River Basin

With the distributed hydrology model system(HMS) and Geographical Information System and the technology of remote sensing for data spatial analysis,by building digital watershed,and then extracting watershed characteristic information,a land surface-hydrology coupled model(LSX-HMS) was established for the Huaihe River basin.The perturbation analysis for parameter sensitivity is employed.Measured hydrologic data were used to calibrate and validate the model.The Nash-Sutcliffe coefficient ranges from 0.760～0.939,indicating that the coupled model has good applicability in the basin.The spatial distribution of 8-year(from 1980 to 1987) average precipitation,evapotranspiration,streamflow and soil moisture are simulated by the LSX-HMS model.It is found that there is a large difference among the spatial distribution of each hydrological variable,precipitation decreases with latitude,evapotranspiration and streamflow are small in upstream and are large in middle and downstream,soil moisture is lower in the basion's west and southwest with mountain and hills and is higher in the region with plain.This research provides a basis for developing,utilizing,allocating and managing water and soil resources in the Huaihe river basin.