River ice numerical simulation method considering riverbed anchor ice

Abstract

The invention relates to a river ice numerical simulation method considering riverbed ice anchoring. The method comprises the steps of collecting water ice data, calculating a one-dimensional shallowwater equation set, water body net heat absorption amount, water temperature, ice concentration in water, surface density of floating ice, ice flower layer thickness, ice cover thickness and ice anchoring thickness, updating a comprehensive roughness coefficient of a river channel, and simulating a river ice process and water level flow change. The method can accurately calculate the growth ablation process of the floating ice, the ice in the water, the ice cover and the anchor ice, can simulate the generation, development, propagation and dissipation process of the anchor ice flood wave, andis high in calculation precision; meanwhile, the method can evaluate the influence of the river ice process on the water level and flow change, the model application range is wide, and the method is suitable for large-range and long-duration ice flood simulation.

Description

technical field [0001] The invention relates to a river ice numerical simulation method considering river bed anchor ice, and belongs to the technical field of water conservancy engineering. Background technique [0002] Affected by seasonal temperatures, northern rivers continue to release heat in winter, which will form water ice, drift ice and frozen ice sheets, which in turn affect changes in water level and flow. The accumulation of river ice under extreme conditions can cause ice to plug ice dams and induce ice floods. The large amount of ice in the water can also adhere to the buildings in the water, and even block the water intake and the trash rack, which makes it difficult to transport water in winter. Anchor ice is a kind of ice adhered or anchored to the bed surface, which is a common phenomenon in rivers in cold regions. The growth of anchor ice can block the river channel and submerge the water intake, forming anchor ice drop ridges, which in turn affects riv...

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Problems solved by technology

The development of shore ice and ice sheets will also reduce the flow area of ​​the river channel, thereby affecting the flow of water in the channel

The growth and release of river ice can significantly change the water delivery capacity of the river canal, causing drastic fluctuations in water level and flow in winter, threatening the industrial and agricultural production on both sides of the river, and bringing hidden dangers to the safety of people's lives and property

[0003] Most of the traditional mathematical models of river ice are aimed at a single river ice process, and cannot solve the problem of river ice in long rivers throughout winter

Existing studies have the following limitations: first, the drag force of river ice on water flow is not considered, and the change of water level and flow under the influence of river ice cannot be accurately reflected; second, the problem of flood waves caused by the growth and release of anchor ice cannot be accurately calculated. The generation, development, propagation and attenuation process of the anchor ice flood wave; the third is that the dynamic development process of ice floes, drift ice flowers and ice sheets cannot be considered, and the influence of the whole process of river ice on the water delivery process of river canals cannot be accurately simulated; the fourth is that it is impossible to Calculating the coupling effect of large-scale and long-duration river ice and water flow, which affects the safety of water delivery in northern rivers

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