Method and system for determining sediment flux approach channel and forebay of pump station

Abstract

The embodiment of the invention provides a method for determining sediment flux of an approach channel and a forebay of a pump station, and the method comprises the steps: obtaining the Sierz number,the sediment settling speed and the ratio of the settling time of sediment in a sediment transport layer to the flow period, and obtaining the phase drift of the sediment to the flow speed and the phase residue of the sediment; taking the flowing speed of the outer boundary layer as a boundary condition, obtaining the depth of the sand-containing moving bed surface eroded by the water flow, the thickness of the reciprocating flow boundary layer and the boundary layer flow speed advance function according to the sediment particle size, the flowing period, the Sierz number, the sediment settlingspeed, the phase drift of the sediment to the flow speed and the phase residue of the sediment, and further determining the sediment flux. Design and calculation are carried out through the determined relevant phase difference and the determined thickness parameters of the movable bed surface and the boundary layer, the time response of the instantaneous sediment flux relative to the hydrodynamiccondition in the reciprocating flow process can be reflected, the change of the movable bed surface and the effect of the movable bed surface are reflected, and underestimation of the half-cycle average sediment flux is avoided.

Description

technical field [0001] The embodiments of the present invention relate to the technical field of water conservancy engineering, and more specifically, to a method and system for determining the sediment flux of a pumping station diversion channel and a forebay. Background technique [0002] Sediment flux is the product of sediment concentration and velocity, indicating the amount of sediment passing through a unit section per unit time. In the reciprocating flow of the pumping station's diversion channel and the sandy bed surface of the forebay, the sediment flux is dynamically changing . [0003] The sediment flux widely used in engineering is derived based on the theory of constant flow, without considering the change of the moving bed surface, and does not include the asymmetry and phase difference of the boundary layer. This leads to its disadvantages: it cannot reflect the change of the moving bed surface and the effect of the moving bed surface, it cannot reflect the ...

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Problems solved by technology

This leads to its disadvantages: it cannot reflect the change of the moving bed surface and the effect of the moving bed surface, it cannot reflect the time response of the sediment flux relative to the hydrodynamic conditions, and it cannot reflect the asymmetry of the boundary layer and the large phase difference. Negative net velocity and net flux will also cause an underestimation of the half-period average sediment flux

But so far, how to give the sediment flux of the sand-containing moving bed surface under the reciprocating flow conditions of the pumping station's diversion canal and the forebay, there is no achievement and method for reference. Therefore, the present invention continues to provide a pump Determination method of sediment flux in station diversion canal and forebay

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