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Method for estimating the shear stress of large area bed in fixed bed river model test

A technology of river engineering model and shear stress, which is applied in the field of hydraulic measurement, can solve the problem of low calculation efficiency of bed surface shear stress, achieve the effect of reducing influence and improving estimation efficiency

Active Publication Date: 2018-12-18
CHINA INST OF WATER RESOURCES & HYDROPOWER RES
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Problems solved by technology

[0003] The technical problem to be solved by the present invention is to provide a method for estimating the shear stress of a large-area bed surface in a fixed-bed river engineering model test, and to solve the problem of low calculation efficiency of the bed surface shear stress

Method used

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  • Method for estimating the shear stress of large area bed in fixed bed river model test
  • Method for estimating the shear stress of large area bed in fixed bed river model test
  • Method for estimating the shear stress of large area bed in fixed bed river model test

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Embodiment Construction

[0032] The principles and features of the present invention are described below in conjunction with the accompanying drawings, and the examples given are only used to explain the present invention, and are not intended to limit the scope of the present invention.

[0033] Such as figure 1 As shown, a method for estimating the shear stress of a large-area bed surface in a fixed-bed river engineering model test includes the following steps:

[0034] S1, placing a plurality of small balls in the fixed bed river engineering model;

[0035] S2. Take a plurality of images of the position of the ball on the fixed-bed river engineering model by the camera, and fit the coordinates of the position of the ball on each picture to obtain the trajectory of each ball;

[0036] S3. Calculate the acceleration of each small ball according to the trajectory of each small ball;

[0037] S4. Calculate the bed surface shear stress at different parts according to the acceleration of each small bal...

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Abstract

The invention relates to a method for estimating large area bed shear stress of a fixed bed river model test. A method for estimating a bottom bed shear stress using a bottom particle trajectory by selecting small balls with different particle sizes, the influence of water depth on the shear stress measurement can be reduced, and the bed shear stress of large area and different parts in the fixedbed model test of river engineering can be synchronously and quickly obtained by the invention, thereby greatly improving the efficiency of the bed shear stress estimation.

Description

technical field [0001] The invention relates to the technical field of hydraulic measurement, in particular to a method for estimating the shear stress of a large-area bed surface in a fixed-bed river engineering model test. Background technique [0002] When the water flow is flowing, the bottom of the bed creates resistance to the flow of water, and this resistance can usually be characterized by the shear stress of the bed surface. At the same time, bed surface shear stress is one of the important parameters to characterize the intensity of sediment movement, and almost all sediment movement intensities can be expressed by bed surface shear stress. At present, the shear stress on the bed surface can be measured by local sensors, or reversed by the flow velocity distribution at the bottom. The local sensor method needs to install sensors on the bed surface, which is more complicated; the flow velocity distribution needs to measure the local flow velocity distribution, whic...

Claims

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Application Information

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IPC IPC(8): G06F17/50
CPCG06F30/20G06F2119/06
Inventor 曹文洪刘春晶鲁婧谷蕾蕾关见朝刘磊胡健张治昊朱毕生解刚
Owner CHINA INST OF WATER RESOURCES & HYDROPOWER RES
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