Author(s): Yinqin Tang; Tong Wang; Jingwei Feng; Jun Wang; Jueyi Sui
Linked Author(s): Jun Wang
Keywords: Ice jam; Ice cover; Trapezoidal cross-section; Energy equation of flow; Calculation formula of ice jam thickness
Abstract: Rivers at high latitudes or high altitudes often have ice cover or ice jams in winter. With the development of ice cover or ice jams, the hydraulic conditions and boundary conditions of rivers will also change accordingly, thus weakening the flow capacity of rivers and channels. The upstream water level is raised, which often causes ice flood disasters and poses a threat to the safety of life and property of residents along the river. Therefore, it is necessary to accurately calculate the thickness of ice jams. On the basis of the existing ice flow energy equation, according to the actual situation of the Middle Route Project of South-to-North Water Diversion, the theoretical equation of the relationship between ice jam thickness and water level and its variation under the condition of trapezoidal section is derived. According to the theoretical equation, the equation between the Froude number of water flow and the ice jam thickness and water depth is obtained, and the extreme value line equation is analyzed, which reveals the interaction between the hydraulic conditions of water flow and the ice jam thickness. According to the measured data of the long-distance water conveyance channel of the middle route of the South-to-North Water Diversion Project, the theoretical equation is verified, and the verification results are good. It provides a new method for the calculation and simulation analysis of the ice jam thickness and water level of the long-distance water conveyance channel in winter
Year: 2025