Calculation method of riverbed erosion and deposition under action of plane vortex water flow

Abstract

The invention discloses a calculation method of riverbed erosion and deposition under the action of plane vortex water flow. The method comprises the following steps: collecting river basic data of riverbed erosion and deposition needing to be calculated under the action of plane vortex water flow; establishing a planar two-dimensional or three-dimensional water flow sediment movement mathematical model; calculating river water flow velocity distribution, water depth, plane vortex water flow structure and sediment transportation information; calculating the effective gravitational acceleration of the sediment under the action of the plane vortex water flow; correcting and calculating the settling velocity of the sediment under the action of the plane vortex water flow; correcting and calculating the sediment transport capacity under the action of the plane vortex water flow; and calculating to obtain a riverbed erosion and deposition value under the action of the plane vortex water flow. According to the invention, the riverbed scouring and silting value under the action of the plane vortex water flow can be rapidly and accurately calculated, riverbed scouring and silting calculation when the effective gravity of sediment changes due to the action of the vortex water flow is achieved, the method is closer to the actual situation, and technical support can be provided for comprehensive treatment and protection of a river channel.

Description

technical field [0001] The invention belongs to the technical field of river dynamics in water conservancy engineering, and in particular relates to a calculation method for river bed erosion and deposition under the action of plane vortex water flow. Background technique [0002] Planar vortex flow structures are very common in natural channels and water bodies, and are usually caused by prominent natural rock heads or artificial structures. Actual observations show that under the action of this kind of planar vortex flow, the water flow will add upward force, and the effective (equivalent) gravity of the sediment will change accordingly. , bringing challenges to comprehensive river management and protection. [0003] However, under the action of planar vortex flow, the mechanism of river bed erosion and deposition is very complicated. Due to the action of vortex flow, the effective (equivalent) gravity will change, and the existing calculation methods for river bed erosio...

AI Technical Summary

Problems solved by technology

Actual observations show that under the action of this kind of planar vortex flow, the water flow will add uplift force, and the effective (equivalent) gravity of the sediment will change accordingly. , bringing challenges to comprehensive river management and protection

[0003] However, under the action of planar vortex flow, the mechanism of river bed erosion and deposition is very complicated. Due to the action of vortex flow, the effective (equivalent) gravity will change, and the existing calculation methods for river bed erosion and deposition will not be applicable. At present, there is no mature and accurate calculation method

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