Method for estimating shear stress of rectangular canal wall surface and bed surface

A shear stress and channel technology, applied in calculation, computer-aided design, instruments, etc., can solve problems such as large calculation errors, poor correlation, and unsatisfactory engineering design, and achieve the advantages of convenient and concise methods, improved calculation accuracy, and wide application Effect

Active Publication Date: 2020-07-10
CHINA INST OF WATER RESOURCES & HYDROPOWER RES
View PDF13 Cites 3 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The main disadvantages of this calculation method are: the artificial channel or the rectangular channel under the experimental conditions do not meet the assumption of wide and shallow channels, and the calculation error of the method ignoring the shear stress of the side wall is large, which cannot

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Method for estimating shear stress of rectangular canal wall surface and bed surface
  • Method for estimating shear stress of rectangular canal wall surface and bed surface
  • Method for estimating shear stress of rectangular canal wall surface and bed surface

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0021] This embodiment is a method for estimating the shear stress of a rectangular channel wall and bed surface, and the steps of the method are as follows:

[0022] Step 1, measurement parameters: field measurement of the river width B, water depth H, wetted area P and hydraulic gradient s of the rectangular channel;

[0023] Step 2, calculate the average shear stress τ of the bed surface b :

[0024]

[0025] Step 3, calculate the average wall shear stress τ w :

[0026]

[0027] In the formula, γ is the specific gravity of water;

[0028] Step 4, calculate the ratio of the drag force on both side walls to the drag force on the bed surface:

[0029]

[0030] Among them, F w is the drag force of the water flow acting on the two side walls, F b is the drag force of the water flow on the bed.

[0031] In this embodiment, the width, water depth, wetted perimeter and hydraulic gradient of a smooth rectangular channel are used to calculate the shear stress of the ...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

No PUM Login to view more

Abstract

The invention relates to a method for estimating shear stress of a rectangular canal wall surface and a bed surface. The method comprises the following steps: calculating the average shear stress of the bed surface; calculating the average shear stress of the wall surface; and calculating the ratio of a dragging force on the two side walls to a bed surface dragging force. According to the method disclosed by the invention, the average shear stress of the side wall and the bed surface is calculated by utilizing the section size, the hydraulic gradient and the width-depth ratio correction coefficient of the smooth rectangular canal, and the drag force of the water flow acting on the wall surface and the bed surface under the constant uniform flow condition can be accurately calculated. According to the method, the calculation precision of the average shear stress of the wall surface is improved to be within 7.5%, and the calculation precision is greatly improved. Compared with a traditional bed surface shear stress calculation method, the method has the advantages that the side wall effect is comprehensively considered, and the canal resistance coefficient and the riverbed erosion and deposition change can be analyzed more accurately. The method is convenient and simple, can be suitable for canals with different width-depth ratios, unifies wall surface shear stress calculation ofthe wide and shallow canals and the narrow and deep canals, and is wider in application range.

Description

technical field [0001] The invention relates to a method for estimating the shear stress of the wall surface and bed surface of a rectangular channel, which is a hydraulic calculation method and a method for analyzing the resistance of experimental water tanks and channels and studying sediment. Background technique [0002] The wall resistance and bed resistance of a rectangular channel are the basic elements of flume experiments and channel hydraulics research, the basis of channel resistance coefficient research, and the premise of sediment settlement and transport calculations. The shear stress distribution of the side wall and river bed of a rectangular channel is closely related to the flow velocity distribution of the section, the roughness of the side wall, the shape of the cross-section, and the secondary circulation. On-site measurement of the non-uniformity, side wall roughness, flow velocity and secondary circulation distribution of different sections of the cana...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
IPC IPC(8): G06F30/28G06F113/08G06F119/14
Inventor 潘佳佳郭新蕾王涛付辉李甲振郭永鑫余弘婧路锦枝杨涛
Owner CHINA INST OF WATER RESOURCES & HYDROPOWER RES
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap