Exploration of waterlogging regulation path in the cities on the Loess Tableland in Northwest China based on the concept of Sponge City: a case study of Qingyang City in Gansu Province, a pilot city of National Sponge Cities

In the face of global climate anomalies and frequent rainfall, China's large and medium-sized cities are extensively and frequently flooded, so urban waterlogging becomes increasingly severe. As an important means of management of rain and flood resources, Sponge City provides a new way to solve urban waterlogging. In this paper, taking the waterlogging regulation in the Old Urban Area of Qingyang as an example, with the construction of Sponge City as the concept, the current waterlogging was analyzed through the field investigation and simulation. According to the local characteristics of climate and rainfall, terrain, and topography, and soil and water body, systematic regional waterlogging regulation measures of "source reduction, process control, and terminal storage" were put forward address the actual situation of collapsible loess and soil and water conservation in the cities on the Loess Tableland, which provided experience and reference for similar water problems in other cities on the Loess Tableland in Northwest China.