Distributed Concentration Model Based on Watershed Basic Unit and Its Application

In view of the disadvantages of complex traditional concentration calculation and in need of many parameters,distributed concentration calculation method is proposed in terms of the basic unit.Discrete model based on the V-shape and the horseshoe-shape is built.And then the area-time curve method and Koussis method are adopted to calculate slope runoff and river network runoff.Based on the combination of two results,distributed watershed concentration model is obtained.Taking the Yanduhe basin for an example,the results has high precision.The model has the advantages of simple structure,less of data needed,implementation easily.