Flood Inundation Analysis of Xun River Based on 1D and 2D Hydrodynamic Coupling Model

The Xun River is prone to flooding due to its tortuous course and low flood control standards. In this paper, the 1D and 2D hydrodynamic coupling model is used to simulate the flood situation of the Xun River in different return periods, obtain the initial inundation time, maximum inundation depth, maximum inundation area and other information of the flood, and comprehensively analyse the changes in the flood area of different water depth and different townships. The results show that with the increase of return period, the flood inundation range and inundation depth also increase, and the initial inundation time of the flood decreases; the proportion of shallow water areas of 0.05-0.5 meters decreases, and the proportion of deep water areas exceeding 3 meters increases; compared with the flood situation in different townships, Zhonglou Town is more seriously affected, and the area and population of various assets affected by the flood in Zhonglou Town are greater than that of Huangdun Town. This research provides guiding significance for the prevention and control of flood disasters in the Xun River and the rescue and disaster relief.