Alluvial river bank collapse early warning method

Abstract

The invention discloses an alluvial river bank collapse early warning method. Aiming at collapse of a binary structure bank of an alluvial river under long-term action of water flow, the position of bank collapse can be forecasted early; meanwhile, rolling forecast can be continuously performed by utilizing the characteristics that river section data is relatively easily acquired and more forecasting times are present, and the forecast accuracy is improved. The method comprises the following steps of: determining a river bank stability index, forecasting river bed deposition and erosion change and performing early warning and judgment on the bank collapse. By using the bank slope stability index determining and judging standard, comparing with a forecast slope and combining with a gradingjudgment index system, the position of a dangerous bank section can be early warned, and technical support is provided for dike maintenance and management.

Description

technical field [0001] The invention proposes an alluvial river bank collapse early warning method capable of quantitatively evaluating the location of the bank collapse and its danger level, aiming at the banks and beaches of the binary structure of the alluvial river. Background technique [0002] Bank collapse is one of the major disaster forms of alluvial rivers, which occurs more frequently and is more harmful. The collapse mechanism of alluvial river banks is relatively complex, involving soil mechanics, geomorphology, river dynamics and other disciplines, and its prediction has always been a difficult point in flood control and disaster reduction. Existing researches on bank collapse prediction methods are mainly carried out from two aspects. One is the empirical relational formula based on the theory of river dynamics, such as the river correlation formula for estimating the collapse width of the river bank, the relational formula between the relative expansion widt...

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Problems solved by technology

Therefore, it is not yet possible to test the rationality of the above model, and it is also difficult to directly apply it to the prediction of actual river bank collapse.

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