Research On Hydrological Effects Of Urbanization In Xuzhou

With the accelerative development of global urbanization, urban river system andnatural hydrological cycle have been disturbed and destroyed. These disturbances anddestruction result in a series of water eco-environment problems, such as fresh watershortage, flooding disaster frequency, water pollution, river discontinuous flow,wetlands decrease, desertification expansion, groundwater overexploitation, seawaterintrusion, water loss and soil erosion, river ecosystem destroyed, etc. Thehydrological effects of urbanization have been one of the leading edge and hot issuein the global climate and environment change fields.This paper that taking Xuzhou asthe study area analysis of urbanization in the past30years, and simulate the impact ofurbanization on the regional hydrological cycle development.The findings mayprovide the basis for urban flood mitigation and sustainable use of water resources,but also provide a scientific reference and basis for sustainable urban development.The urbanization process of urbanization is measured by socio-economic andspatial aspects of urbanization in Xuzhou City since1983.Xuzhou urbanizationcomprehensive evaluation system is constructed from the demographic, economic,lifestyle and quality of life as well as the geographical landscape of the four angles,Xuzhou city composite index from0.0047to0.1171for30years.Based on theexpansion of urban construction land, especially the interpretation of spaceurbanization of land use change in Xuzhou, Xuzhou,urban construction land expandsmore than doubled for30years.Respectively from changes in rainfall, the annual runoff, storm flood flow, waterlevel, water quality and water quantity and other hydrological factors to explain therelationship between urbanization and the hydrological effects. With the developmentof urbanization, Xuzhou annual runoff, flood times, basically growing trend of rainfall,water quality and water quantity is also due to the rapid development of urbanizationand change accordingly.The SCS model simulates the use of annual runoff and storm flood flowsbetween1983-2013under different stages of urbanization, Liu set based gate roompavilion River sub-basin study area measured runoff data for model parametercorrected to ensure that the model in the study adaptive area. The simulation resultsshowed that: under different land surface, precipitation, antecedent soil conditions, the annual runoff varies. Average soil moisture in the early rainfall frequency of0.50,the case of803mm of rainfall, runoff of1983654mm, runoff coefficient0.81,2013year runoff696mm, runoff coefficient of0.87, compared to1983runoff and runoffcoefficients have increased. In the early soil moisture conditions for the averagefrequency of rainfall in1983was90%(dry year) and10%(wet year) of annualrunoff from494mm to893mm, the runoff coefficient from0.78to0.85. Designreturn period storm runoff coefficient of variation of the process can be divided intoslow rise (1983-2003) and fast rise (2003-2013) two stages. In the early soilmoisture conditions for the average of1983to2013the peak flow from222.46m3/sto286.62m3/s, peak time is now reduced from34.33h to26.65h, floods can not beinfiltration, easily lead to flooding runoff.