Sediment underwater repose angle-based riverbed adjustment method

Abstract

The invention provides a sediment underwater repose angle-based riverbed adjustment method. The method has the characteristic of adjusting a riverbed by stage, namely, the riverbed adjustment processof a point is divided into different stages according to types; in the stages, different calculation formulae are adopted for performing riverbed adjustment, and the riverbed adjustment only aims at one to two adjacent nodes in a stage; the riverbed adjustment in the stages satisfies soil mass conservation, namely, the adjustment has conservativeness; in the single stage, each adjustment has simultaneity; the conservativeness and the conservativeness enable the adjustment process of the whole riverbed to better conform to physical reality; and factors such as the mutual influence between the adjacent nodes, the soil mass conservation of the riverbed, and the like are comprehensively considered, so that the adjustment process has good physical simulation performance, an adjustment result better conforms to a physical law, and the riverbed evolution simulation efficiency is improved. An adjustment mode of a single node, namely, a neighboring point is given only, but is easily expanded and applied to all spatial grid nodes, and can be better combined with a hydraulic calculation program of a structured grid.

Description

technical field [0001] The invention relates to a method for solving scouring and silting deformation of a river bed surface, in particular to a method for adjusting a river bed. Background technique [0002] In the current scientific research, the method of solving the erosion-silting deformation of the river bed surface is generally: by calculating the mass of suspended and transported sediment near the bed, and based on the sediment mass conservation equation. Numerical simulations of suspended and transported mass are mostly based on empirical formulas, most of which establish the correspondence between sediment concentration and bottom flow velocity. When using direct numerical simulation (DNS) to solve high Reynolds number water flow, the flow velocity is often random. Substituting the flow rate into the empirical formula will lead to great variability in the amount of suspended and transported matter in both space and time. Therefore, when using the traditional sedi...

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Problems solved by technology

Therefore, when using the traditional sediment numerical simulation method in DNS to calculate the change of the bottom of the river bed, the river bed is often uneven, and the shape of these uneven bed surfaces usually does not meet the stability requirements of the sediment particles themselves in the water

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