Mechanism Analysis of the Urban Water-logging based on the PSR model considering Dualistic Hydrological Cycle Process

With the rapid development of China's economy, the number of victims and economic losses caused by Urban Waterlogging continue to increase, and Urban Waterlogging has become the core problem to be solved. Considering the blind spots of related research in the study area, it is necessary to carry out an Urban Waterlogging diagnosis systematically and scientifically in Xining City, so as to provide targeted guidance for solving the waterlogging problem in Xining city. In the framework of Dualistic Hydrological Cycle Process, combined with PSR evaluation model, the pressure P system is composed of urbanization level characteristics, land use characteristics and rainfall evolution characteristics, the state S system is composed of historical waterlogging and current waterlogging, and the response R system is composed of sponge city construction, drainage operation management and drainage network construction. The comprehensive results show that the main causes of Urban Waterlogging in Xining city can be summarized as increased pressure, unbalanced state and scattered response.