Study On Influence On Flood Process By Land Utilization Arrange

The study on rainstorm hydrological processes based on MMS (Modular Modeling System), which is associated with national natural science fund"The research of forest vegetation fluence on the flood process in the Three Gorges Reservoir watershed", from the effect of land utilization on precipitation, runoff and infiltration, the storm event distributed hydrological model (PRMS_ Storm) with physical mechanism is built, fitted and verified. Through modeling the flood process in the different scenarios, the research foundation is offered about setting scientific and appropriate arrange of soil and water conservation measures.First of all, the storm event distributed hydrological model (PRMS_ Storm) with physical mechanism is built based on MMS (Modular Modeling System) with ArcGIS, and observation, investigation, experiment on site.According to simulating each peak flow and water yield of the 8 land utilization arrange spatial scenarios by 4 actual measurement typical storms in Xiangshuixi watershed of Simian Mountain, the results that forest situated upriver district of watersheds is the best type for cutting flood peck, and random distribution for direct runkoff evidently.On this basis the simulation results that how land utilization influence flood process under the different land utilization arrange scenarios are gained. When forest coverage is 20 percent, 40 percent and 60 percent without any other land utilization arranged , the corresponding average peaks flood under 4 storms are 0.865 mm/min, 0.717 mm/min and 0.376 mm/min.When forest coverage is a fixed value,the inpact of cutting flood peck is more evident with shrubbery arranged, and the direction of runoff coefficient change is shrubberyâ…¡