Experimental Study On Impact Of Different Soil Texture Landscape Structure On Rainfall Infiltration

Soil texture is a steadly nature propertly of soil, which determine the physcicscharacteristic of soil, and is the important factor on impact of soil moisture movement.Because of the mineral in soil with different grain relative proportion and thickness, thereare great diversity in the ability of moisture pass through the soil, also on the impact ofrainfall infiltration process. City underlying surface is the base of existence anddevelopment of the urban, which is the summation of urban surface. With thedevelopment of urbanization, urban building become more and more, urban landincreases, all these change the form of using urban land. And hydrological character withdifferent soil texture has been influenced remarkable at location. With the urban surfacebecome harder, obstructing the urban rainfall infiltration seriously, at the same timeconflux time decreases, surface runoff increase, bring a huge pressure on the urbandrainage system. Obviously, underlying different soil texture, it is far-reaching meaningsto the development of society and economy that find the best spatial structure of cityunderlying surface by study the quantitative relationship of the spatial structure of cityunderlying surface and rainfall infiltration to increase rainfall infiltration and reduce thestorm water runoff, solve the problem of urban water resource shortage in certain level.In this paper, underlying different soil texture, the author adopts artificial rainfalltest to conduct experimental study on the quantitative relationship of the spatial structureof city underlying surface and rainfall infiltration. Change the position and proportion ofimpervious patch in the uniform experimental sample field under the same of rainfall andduration of rainfall. Measure the surface runoff yield and count the rate of rainfallinfiltration after simulating rainfall. The results show that changing the proportion, shape,evenness and separation of impervious patch causes different rainfall infiltration yield.Factors of affecting rainfall infiltration of city underlying surface spatial structure,proportion of impervious patch have great contribution to the rate of rainfall infiltration.The effect of shape, evenness and separation of impervious patch are less than thecontribution of the proportion of impervious patch. However, it is can't be neglected thatthe function of shape, evenness and separation of impervious patch. On typical cityunderlying surface, controlling the rainfall infiltration through adjusting the combinedcorrelation of shape,evenness and separation of impervious patch better than changingthe proportion of impervious patch.