Water Resources and Power

To prevent waterlogging, urban river channels are kept low or empty during floods. As rainfall and flood forecasts improve, water storage plans need to be optimized. In order to ensure the safety of urban drainage, relieve urban waterlogging, and consider river landscape, the Ximinbian River basin in Suqian City was taken as an example. A multi-dimensional coupling model of water production and confluence-two-dimensional surface-one-dimensional pipe network-river channel was established. The model was verified by manual measurement and pipeline automatic monitoring data. Under 1-year, 2-year, 5-year, 10-year, 20-year rainfall return period, the waterloggings were evaluated under 8 kinds of river boundary water levels. The impact of water level topping on urban waterlogging was explored, and an optimization storage plan was proposed. The results show that under different recurrence periods, the total amount of waterlogging water increases with the increase of river level. The total waterlogging volume V is a cubic function of the proportion of submerged outlet(P_PIO), and the R² is between 0.986 and 0.999. The relative discharge increases with the increase of river water level, and the increase rate of the waterlogging is related to the elevation difference between upper and lower reaches of pipeline section and inundation depth of outlet. The optimized cascade water storage scheme can control the waterlogging effect caused by river top water level.