River ice movement and beach erosion calculation method considering water, ice and sand coupling effect

Abstract

The invention relates to a river ice movement and beach erosion calculation method considering a water, ice and sand coupling effect. The method comprises the steps that basic conditions are input, atwo-dimensional water and sediment numerical module is operated, and water and sediment elements and river ice elements are calculated; and the data is transmitted to a beach erosion module, the beachchange under the water-ice-sand coupling effect is calculated, the river ice element and the beach change are fed back to the two-dimensional water-sand numerical module, the water-sand element is updated, and the steps are repeated to sequentially calculate the water-sand elements, the river ice elements and the beach changes at different coupling time until the end time. The method can accurately simulate the non-constant water flow change, the river ice power process, the non-uniform sediment movement, the riverbed erosion and deposition change and the beach erosion process, and is suitable for beach erosion research under the influence of river ice of northern rivers in China; water, river ice, silt, beaches and other factors in natural rivers are considered, the method is closer to engineering practice problems, the calculation result is closer to the truth and reliable, the model functions are rich, and the calculation precision is high.

Description

technical field [0001] The invention relates to a calculation method for river ice movement and beach erosion considering the coupling effect of water, ice and sand, and belongs to the field of water conservancy engineering. Background technique [0002] Affected by seasonal temperature changes, rivers in northern my country will experience drifting and freezing in winter. The development and release of chained ice plugs and ice dams under extreme climate conditions can lead to disasters similar to cascade dam break floods, seriously endangering the safety of people's lives and property, restricting industrial and agricultural production on both sides of the river, destroying the deployment of ice disaster prevention and mitigation for large rivers, threatening Water transportation safety in winter. Rivers such as the Yellow River, Mohe River, and Heilongjiang River encounter the problem of ice dams and ice dams to varying degrees every year. The drift movement in winter c...

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Problems solved by technology

[0003] Traditional water-sediment research and river dynamics mainly analyze the interaction of water flow, sediment and riverbed, ignoring the impact of winter river ice process on water-sand movement and beach erosion, which cannot meet the needs of northern rivers for winter water safety.

The traditional river dynamics research has the following limitations: first, it does not consider the scraping and cutting effect of the ice on the bank in winter, and cannot accurately evaluate the erosion and collapse process of the bank under the influence of river ice; The impact of ice dams on embankment safety cannot be quantitatively calculated for the amount of beach erosion caused by the formation, development and release of ice dams; The complex coupling effect of canal, riverbed deformation and beach erosion cannot accurately reflect the seasonal river evolution process of northern rivers

In addition, most of the existing canal design flows are designed based on water level and flow data under ice-free conditions, which cannot meet the flood control requirements of ice-covered rivers under extreme conditions

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