Distributed Hydrological Model Research In Upper Fenhe Watershed

Distributed hydrological model is a hot research issue of hydrology in recent years. Scince temporal and spatial variations of precipitation, watershed underlying surface and effects of human activities can be considered in distributed model, its accuracy of modeling is high compared with lumped model. Meanwhile, it can assist people to analyze runoff components in a watershed and deeply realize the nature of hydrological process.Based on referring to many pertinent literatures and analyzing hydrological characteristics of upper Fenhe watershed, a rainfall-runoff distributed hydrological model orienting to catchment scale is established in this thesis. In this model, runoff yielding and water routing model of SCS and Muskingum method is firstly combined to calculate discharge process of this area. Moreover, taking gradient and slope angle as main factors, a watershed is discretized into some sub-catchments according to natural draining divide and a method about disposing point rainfall in this area is proposed.To test accuracy of this model, Lanhe catchment of this area is chosen as a typical catchment which is integrated with this model. Through analysis ofcomputational modeling results, it shows that calculated runoff yielding and water routing which meet to demand account for 70% and 80% respectively, and modeling discharge process are basically coincident with measured discharge process. It can be concluded from above this distributed model is reasonable in discretization of watershed, calculation of runoff yielding and water routing, and dealig with point rainfall and parameters. On the whole, this model is suit to modeling runoff yielding and water routing in this area.