Method and device for determining total suspended sediment amount of pump station approach channel and forebay

Abstract

The embodiment of the invention provides a method and device for determining the total suspended sediment amount of a pump station approach channel and a forebay. The method comprises the steps that the outer boundary layer flow velocity, the flow period, the sediment particle size and the ratio of sediment to water density of the pump station approach channel and a forebay water body are obtained; based on the maximum value of the flow velocity of the outer boundary layer, the flow period, the sediment particle size and the ratio of sediment to water density, the maximum Sierz number and thefriction factor of the sand-containing movable bed surface are obtained; according to the law of conservation of mass, the total suspended sediment amount on the sand-containing movable bed surface and the proportion of the total suspended sediment amount to the total sediment amount above the initial bed surface are obtained. According to the method, mass conservation is considered, design calculation is carried out through the determined related phase difference parameters, the time response of the total suspended sediment amount relative to water flow in the reciprocating flow process can be reflected, phase residues of the total suspended sediment amount and phase drift of the relative flow speed after the flow speed is reduced are reflected, and underestimation of the mean value of the total suspended sediment amount is avoided.

Description

technical field [0001] The embodiments of the present invention relate to the technical field of water conservancy engineering, and in particular to a method and a device for determining the total amount of suspended sediment in a diversion channel of a pumping station and a forebay. Background technique [0002] During the operation of the pumping station, determining the total amount of suspended sediment on the sandy moving bed of the diversion channel and the forebay considering mass conservation and including the effect of phase difference will help to select a suitable water intake location for sandy water, and it is also necessary to judge the amount of sediment entering the pump, The main basis for water pump abrasion and protective measures for pump installations. [0003] The determination of the total amount of suspended sediment on the sand-bearing dynamic bed surface in the project is mainly based on the constant flow theory, which fails to consider the mass con...

AI Technical Summary

Problems solved by technology

This leads to: it cannot reflect the phase drift time of the relative flow velocity of the sediment movement and the phase residue of the total amount of moving sediment after the flow velocity is reduced, and also underestimates the average value of the total amount of suspended sediment in asymmetric flow

[0004] So far, how to give the total amount of suspended sediment in the water body under the condition of reciprocating flow, there are no achievements and methods for reference

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