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Determination method and device for unit-width sediment discharge of approach channel and forebay of pumping station

A technology of sediment transport rate and pumping station, which is applied in the field of determining the sediment transport rate of the pumping station channel and the single width of the fore-pond, which can solve the problems that are not suitable for the negative net sediment transport and cannot give the instantaneous sediment transport rate and the number of flow velocity. relationship, can not reflect the sediment transport rate phase drift and phase residue and other issues

Active Publication Date: 2020-06-05
CHINA AGRI UNIV
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Problems solved by technology

[0003] This leads to its disadvantages: it cannot reflect the phase drift and phase residue of the sediment delivery rate relative to the flow velocity, and cannot give the relationship between the instantaneous sediment delivery rate and the flow velocity times, and is not suitable for the negative net sediment delivery caused by the large phase difference in the asymmetric flow. situation
But so far, how to give the instantaneous single-width sediment delivery rate of the pumping station diversion channel and the sandy bed surface of the forebay under the condition of reciprocating flow, there are no achievements and methods for reference

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  • Determination method and device for unit-width sediment discharge of approach channel and forebay of pumping station

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Embodiment Construction

[0023] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments It is a part of embodiments of the present invention, but not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

[0024] figure 1 It is a flow chart of a method for determining the single-width sediment delivery rate of a pumping station diversion canal and a forebay in an embodiment of the present invention, as figure 1 As shown, the method includes:

[0025] S1, obtain the outer boundary layer flow velocity, flow cycle, sediment particle size, ratio ...

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Abstract

The embodiment of the invention provides a determination method and device for the unit-width sediment discharge of an approach channel and a forebay of a pumping station. The method comprises the steps that the outer boundary layer flow speed, the flow period, the sediment particle size, the ratio of sediment to water density, and the water kinematic viscosity coefficient of water bodies of the approach channel and the forebay of the pumping station are obtained; the Shields number and the friction factor of a reciprocating flow sediment-containing movable bed surface are obtained; and on thebasis of all the parameters, boundary layer asymmetry analysis of the movable bed surface is carried out, and the erosion depth and the boundary layer thickness are obtained, so that the instantaneous unit-width sediment discharge of a volume meter under the reciprocating flow condition is obtained. According to the embodiment, design calculation is carried out through the determined related boundary layer thickness of the movable bed surface and determined phase difference parameters, the phase residual of the sediment discharge after the flow velocity is reduced and the phase drift of the relative flow velocity are reflected, the relation between the instantaneous sediment discharge and the flow velocity times is given, and negative net sediment transport generated by the large phase difference effect in asymmetric flow is judged.

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 single-width sediment delivery rate of a pumping station diversion canal and a forebay. Background technique [0002] In the reciprocating flow of the diversion channel of the pumping station and the sandy bed surface of the forebay, the single-width sediment transport rate is dynamically changed. The instantaneous single-width sediment transport rate widely used in engineering is derived based on the theory of constant flow, which fails to reflect the asymmetric development and phase difference of the reciprocating flow boundary layer. [0003] This leads to its disadvantages: it cannot reflect the phase drift and phase residue of the sediment delivery rate relative to the flow velocity, and cannot give the relationship between the instantaneous sediment delivery rate and the flow veloc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E02B1/00E02B3/02
CPCE02B1/00E02B3/023
Inventor 陈鑫朱启祥王福军汤远
Owner CHINA AGRI UNIV
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