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Method for calculating integrated reach roughness considering local head losses

A technology of local head loss and calculation method, which is applied in the field of hydraulics and river dynamics, can solve the problem of large number of parameters to be calibrated, and achieve the effect of convenient calculation

Inactive Publication Date: 2015-07-08
HOHAI UNIV
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Problems solved by technology

In addition, when there are many river sections to be calculated, the number of parameters to be calibrated is large, and the parameter values ​​have great randomness

Method used

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  • Method for calculating integrated reach roughness considering local head losses
  • Method for calculating integrated reach roughness considering local head losses
  • Method for calculating integrated reach roughness considering local head losses

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Embodiment Construction

[0019] Below in conjunction with accompanying drawing, the present invention is described in further detail:

[0020] Assume that the length of a river section is D x , then the head loss h along the way caused by the shear stress f Can be expressed as:

[0021] h f = λ D x 4 R u 2 2 g - - - ( 1 )

[0022] In the formula: R is the hydraulic radius; g is the acceleration of gravity; λ is the head loss coefficient along the way; u is the average flow velocity of the section, and the mathematical expression is:

[0023] λ = 8 g C 2 -...

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Abstract

The invention belongs to hydraulics and river dynamics, and relates to a method for calculating roughness parameters for hydraulic calculation. The roughness is the major parameter for hydraulic calculation. The value of the parameter has a great influence on the hydraulic calculation result. According to the physical significance of on-way resistance and local resistance, the integrated roughness determination method comprehensively reflects the collaborative influence of the on-way resistance and the local resistance. The integrated roughness is obtained by calculating the roughness value reflecting shearing stress inside a reach and a local energy loss coefficient, and the integrated roughness calculation formula specified in the specification is obtained. According to the method, reach one-dimensional water flow numerical simulation calculation is facilitated, and the new method is provided for determining the reach roughness parameter lacking observation data. The method is feasible compared with a calculation result of a common water surface profile calculation method based on the Bernoulli equation. The method can calculate the integrated roughness of the specified reach, can also be applied to the roughness parameter value of unstable river hydrodynamic numerical simulation and has the quite important practical application significance.

Description

technical field [0001] The invention relates to a calculation method for comprehensive roughness of a river section considering local water head loss, and belongs to the fields of hydraulics and river dynamics. Background technique [0002] The hydraulic calculation of river channels is an important basic technical work often involved in water conservancy, shipping, environmental protection and other related fields. Roughness is an important parameter in hydraulic calculation, and the value of this parameter has an important impact on hydraulic calculation results, and is a key parameter in hydraulic calculation. Generally speaking, for the channel roughness, its value can be determined empirically according to the characteristics of the channel bed surface and river regime with reference to the technical specifications; but for the case of building gates, bridges, culverts, etc. Considering the characteristics of the channel and the synergistic effect of the local head los...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F19/00
Inventor 韩龙喜王光明张奕
Owner HOHAI UNIV
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