Method for calculating resistance coefficient of watercourse containing submerged vegetation

A resistance coefficient and calculation method technology, applied in the field of hydraulics and river dynamics, can solve problems such as unformed, water depth, vegetation type, distribution density rod diameter, limited height, emphasis, etc., to achieve the effect of improving efficiency and accuracy

Active Publication Date: 2021-12-24
CHINA THREE GORGES CORPORATION +1
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Problems solved by technology

At present, some scholars have carried out research on the water flow movement of vegetation-containing channels, but they focus on mechanism analysis, and the water depth, vegetation type, distribution density, pole diameter, height, etc. involved are relatively limited.
A universal drag coefficient calculation formula has not yet been formed, and it is difficult to be widely used in practical engineering

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  • Method for calculating resistance coefficient of watercourse containing submerged vegetation
  • Method for calculating resistance coefficient of watercourse containing submerged vegetation
  • Method for calculating resistance coefficient of watercourse containing submerged vegetation

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specific Embodiment

[0087] Including the calculation method of the channel resistance coefficient of submerged vegetation, in the present embodiment, the resistance coefficient includes the Darcy-Weissbach coefficient f and the Manning coefficient n, and its calculation method includes the following steps:

[0088] Step 1: Establish the analytical formula for the corresponding Darcy-Weissbach coefficient f of the channel with submerged vegetation through theoretical analysis. According to the Darcy-Weissbach formula, f is calculated as,

[0089]

[0090] Among them, τ 0 is the shear stress of water flow, ρ is the density of water, U b is the average velocity of the cross section.

[0091] In a channel with submerged vegetation, the flow shear stress is determined by the wall shear stress τ b and vegetation shear stress τ v It consists of two parts, and the latter is much larger than the former. thereby,

[0092] τ 0 =τ v (2)

[0093] According to the momentum equation, τ v is calcul...

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Abstract

The invention discloses a method for calculating a resistance coefficient of a watercourse containing submerged vegetation, and the method comprises the steps: firstly, building an analytical formula of a Darcy-Welthbach coefficient f corresponding to the watercourse containing submerged vegetation through theoretical analysis; then, for an analytical formula of f, analyzing the relation between each subitem of the formula and a vegetation factor, and determining a dimensionless vegetation factor which affects f; collecting a large amount of test data under different conditions, and establishing a quantitative relationship between f and a vegetation factor through a genetic algorithm; finally, the quantitative relation between n and the vegetation factors is obtained by combining the analytic relation between the Manning coefficient n and the Darcy-Weistbach coefficient f; according to the method for calculating the resistance coefficient of the watercourse containing submerged vegetation, the values of f and n under the conditions of any water depth and vegetation form can be determined, the efficiency and precision of watercourse flood control calculation are improved, and technical support is provided for river management and ecological watercourse construction.

Description

Technical field: [0001] The invention belongs to the fields of hydraulics and river dynamics, and relates to a calculation method for the resistance coefficient of a channel containing submerged vegetation. Background technique: [0002] Vegetation is an important part of river ecosystems. It plays an important role in water conservation, water purification, river slope protection, local climate adjustment, landscape entertainment, etc. It is widely used in ecological river construction and commonly exists in natural rivers. On the other hand, the presence of vegetation changes the channel resistance coefficient, affects the flood evolution speed, and increases the submerged range. Accurately estimating the resistance coefficient of vegetation-containing rivers (resistance coefficients include Darcy-Weissbach coefficient f and Manning coefficient n) is helpful to improve the efficiency and accuracy of river flood control calculations, and is of great importance for river man...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F30/20G06N3/12G06F17/18G06F119/14
CPCG06F30/20G06N3/126G06F17/18G06F2119/14Y02A10/40
Inventor 赵汗青王伟杰贾凤聪戴会超刘志武蒋定国徐志翟然张成潇米博宇冯浩川江敏敏
Owner CHINA THREE GORGES CORPORATION
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