Pump station approach channel and forebay water body sediment concentration distribution determination method and system

Abstract

The embodiment of the invention provides a pump station approach channel and forebay water body sediment concentration distribution determination method and system. The method comprises the followingsteps: obtaining the depth of the sand-containing movable bed surface eroded by the water flow and the volume concentration of the sediment of the sand-containing movable bed surface eroded by the water flow according to the flowing speed of the outer boundary layer, the density ratio of silt to water, the silt particle size, the flowing period, the maximum Sierz number, the silt settling speed, the phase drift of the erosion depth to the flowing speed, the phase residue of silt and the friction factor of a sand-containing movable bed surface. The concentration distribution of the sediment isobtained through the determined relevant phase difference parameters, time response of sediment concentration distribution relative to reciprocating flow in the reciprocating flow process can be reflected, phase residues of sediment concentration after the flow speed is reduced and phase drift of relative flow speed are reflected and underestimation of sediment concentration above an initial bed surface of asymmetric reciprocating flow is avoided.

Description

technical field [0001] The embodiments of the present invention relate to the technical field of water conservancy engineering, and more specifically, relate to a method and system for determining the distribution of sediment concentration in a pumping station diversion canal and a forebay water body. Background technique [0002] In the reciprocating flow of the pumping station's diversion channel and the forebay, the distribution of sediment concentration is dynamically changing. In engineering, the sediment concentration distribution on the sandy moving bed surface is mainly derived based on the theory of constant flow, which fails to satisfy the mass conservation and does not include the effect of phase difference. This leads to its disadvantages: it is difficult to obtain the concentration distribution axis; it cannot reflect the phase drift of the relative flow velocity of the sediment movement and the phase residue of the total moving sediment after the flow velocity ...

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Problems solved by technology

This leads to its disadvantages: it is difficult to obtain the concentration distribution axis; it cannot reflect the phase drift of the relative flow velocity of the sediment movement and the phase residue of the total moving sediment after the flow velocity is reduced, and it will also underestimate the sediment above the initial bed surface of the asymmetric flow. sand concentration

But so far, how to give the sediment concentration distribution on the sandy moving bed surface under the condition of reciprocating flow, there are no achievements and methods for reference. Concentration distribution determination method

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