Watershed instantaneous unit hydrograph based on information entropy theory

The confluence in a watershed is a random phenomenon affected by certain and random factors.Starting with the Watershed instantaneous unit hydrograph being equivalent to the probability density function of the reaching time of water particles in the watershed and based on the information extropy theory,a watershed instantaneous unit hydrograph model is established.The mathematical expression of this model is the same as Nash's instantaneous unit hydrograph in form,and has advantages of clear concept,simple computation,etc.,with its accuracy of computation equivalent to that of Nash's instantaneous unit hydrograph.This method can also be used for confluence computation in areas short of hydrological data.