A Riverbed Adjustment Method Based on Underwater Sediment Angle of Repose

Abstract

The invention provides a river bed adjustment method based on the underwater angle of repose of sediment, which has the characteristics of adjusting the river bed in stages, that is, the river bed adjustment process at a certain point is divided into different stages according to its category, and in each stage, different calculation methods are used. The formula adjusts the riverbed, and the first stage is only for one or two adjacent nodes. The riverbed adjustments in each stage satisfy the conservation of soil mass, that is, they are conserved, and in a single stage, each adjustment is simultaneous and conserved. And simultaneity makes the adjustment process of the whole riverbed more in line with physical reality, comprehensively considers the interaction between adjacent nodes and the conservation of riverbed soil mass and other factors, makes the adjustment process have good physical simulation, and the adjustment results are more in line with physical laws , which is also conducive to improving the efficiency of riverbed evolution simulation. Although the present invention only provides an adjustment method for a single node, that is, its adjacent points, it can be easily extended and applied to all space grid nodes, and can be well 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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