Stable water transfer channel

A channel and stable technology, applied in irrigation pipelines, applications, buildings, etc., can solve the problems of large variation in river facies coefficient, channel deformation, and failure to reach a practical level, and achieve the effect of stable geometric section shape and avoid erosion or deposition deformation

Inactive Publication Date: 2011-05-11
TIANJIN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This trial method has two main disadvantages: (1) The empirical river correlation formula is proposed based on the data of a specific area, so it has no universality, and the fluvial facies coefficient varies greatly, so it is not easy to determine. Severe deformation; (2) Due to the trial calculation method, the calculation result is not unique and has a certain range of variation
The scour-silt balance design method is often used for channels conveying high-sediment flow, but the current scour-silt balance and stable channel design method is not mature enough, has not reached the practical level, and is still in the research and exploration stage

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0088] Known channel design flow Q=200m 3 / s, annual average sand concentration S=18.35kg / m 3 , the average sinking velocity of suspended sediment ω=0.15cm / s, the roughness n=0.01, the slope coefficient m=1.5, and the cross-section and vertical gradient of the channel are calculated using the mathematical model of the non-scouring and non-silting water delivery channel.

[0089] Firstly, the following two formulas are used to calculate the non-scouring velocity and the non-silting velocity respectively:

[0090] υ 不冲 = υ0 (2.5sR 3 / 2 ω 1 / 2 +1) 1 / 3

[0091] In the formula: υ 不冲 is the non-flushing velocity (m / s); υ 0 When it is clear water, the non-flushing velocity (m / s) under the same hydraulic radius is taken as υ in this embodiment 0 =0.52m / s; S is the sand content (kg / m 3 ); R is the hydraulic radius (m); ω is the average sedimentation velocity (cm / s).

[0092]

[0093] In the formula: υ 不淤 is the non-silting velocity (m / s); S is the sand concentration (kg / m ...

Embodiment 2

[0098] Known channel design flow Q=10.0m 3 / s, the maximum allowable sand concentration S max =296kg / m 3 , the median diameter of suspended sand d 50 = 0.039mm, roughness n = 0.025, slope coefficient m = 1.0, the cross-section and vertical gradient of the channel are calculated using the mathematical model of the scour-silting balance water delivery channel.

[0099] First, use the following two formulas to calculate the maximum allowable sediment concentration s max non-silting velocity υ 不淤 and the minimum sand concentration s min dead flow υ 不冲 :

[0100]

[0101]

[0102] In the formula: K H 、K K are the non-silting and non-scouring sediment-carrying coefficients, respectively. For loess channels, K H =3200,K K =1100; d 50 is the median particle size of the sediment (mm); R is the hydraulic radius (m); ω is the average sedimentation velocity (mm / s); Stop unit speed (m / s) and start unit speed (m / s) respectively.

[0103] Then the calculation formulas of ...

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Abstract

The invention discloses a stable water conveying channel, which comprises a silt stabilized channel for conveying water flow with low sand content and a silt stable channel for conveying water flow with high sand content. The mathematical calculation formula of a cross section of the silt stabilized channel is shown as below, and the mathematical calculation formula of a cross section of the silt stable channel is also shown as below, wherein the objective function of the two formulas is phi (x)=Q<2>n<2>(b+2h(1+m<2>)<1 / 2>)<4 / 3> / (bh+mh<2>)<10 / 3>. By adoption of the stable water conveying channel, severe erosion or siltation and deformation of the channel during the operating process can be avoided and the form of a geometric cross section of the channel is maintained stable.

Description

technical field [0001] The invention relates to a stable water delivery channel, which comprises a non-scouring and non-silting balanced channel for transporting low-sand content flow and a scour-silt balance channel for transporting high-sand content flow. Background technique [0002] According to the presence or absence of lining, water conveying channels are divided into lining channels and unlined channels. For water conveyance channels built on loose soil without lining, if the design is not proper, the channel will undergo serious erosion or sedimentation deformation, and even affect the normal operation of the channel. At present, the non-scouring and non-silting design method is mostly used for channels conveying low-sediment water flow, that is, the vertical and horizontal section dimensions and corresponding flow velocities of the channel are first obtained by jointly solving the river correlation equation, the flow continuity equation and the Manning formula, and...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E02B13/00
Inventor 徐国宾刘昉
Owner TIANJIN UNIV
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