Runoff Yield And Concentration Simulation In The Plain Area

The runoff yield and concentration simulation of river net region in the plain was paid more and more attention because of the positional importance, the frequent flood and waterlog disasters, the serious loss etc. The runoff yield and concentration simulation of river net region in the plain had became the difficulty of the hydrological simulation because of some theoretic and technical difficulties that the law of the runoff yield in the plain is especial, measuring data is lacked, the computational result is difficult to examine directly etc. This paper classifieds the underlying surfaces of the plain area into four kinds that water surface, paddy field, arid land, cities and construction used land.On the basis of that anterior persons have had done about the research of runoff yield and concentration simulation mechanism of river net region in the plain, aiming to conquer the disadvantage that Xin Anjiang three layers evaporation was inconsistent with the concept of dive evaporation, this paper had searched after the runoff yield mechanism for arid land, connected the runoff yield and concentration simulation of river net region in the plain with water table, tested the rationality of the model computational result by the criterion whether computational water level tallied with measuring data, and putted forward new idea about leakage of the paddy field and the irrigation. Taking Jia Xing and Yu Cheng of Tai Lake basin for example, this paper had calculated respectively two states runoff yield for single site that have measuring rainfall and evaporation data at the same time and only have measuring rainfall data, need transplant evaporation data; contrasted computational runoff under the same computational condition by the method depicted in this paper with that of formerly adoptive method.