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Forecast method of average flow direction in bending channel of flood plain

A technology of curved river channels and prediction methods, applied in the fields of hydraulics and river dynamics, can solve the problem of not finding out the water depth and average water flow direction of the main curved channel.

Active Publication Date: 2018-12-21
SICHUAN UNIV
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Problems solved by technology

[0005] At present, although a large number of experiments and numerical simulations have been carried out to explore the change law of water flow direction in the curved main channel; however, up to now at home and abroad have not found a clear mechanism, simple structure and accurate calculation of the horizontal direction of the average water flow direction of the curved main channel water depth. Mean Forecasting Method

Method used

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  • Forecast method of average flow direction in bending channel of flood plain
  • Forecast method of average flow direction in bending channel of flood plain
  • Forecast method of average flow direction in bending channel of flood plain

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Embodiment 1

[0066] In this embodiment, the formula for predicting the mean water depth, average water flow, and lateral average value of the flow direction of any section between the bend-entry section and the curved top section of the floodplain curved channel obtained through the test of the curved channel flume is described in detail.

[0067]①Test purpose

[0068] The vertical development process of the secondary flow vortex between the entrance section and the curved top section of the floodplain curved channel was analyzed through the flume test, the distribution law of the height of the secondary flow vortex in different sections was determined, and the secondary flow vortex was determined through the test results. The relational expression of the depth-average water flow direction inside and above the vortex group is proposed, and the horizontal average prediction formula of the depth-average water flow direction of any section between the bend section and the top section of the fl...

Embodiment 2

[0123] The method for predicting the average water flow direction of floodplain curved channel water depth provided in this embodiment includes the following steps:

[0124] (1) For the flow rate U 0 >0cm / s curved channel, calculate the flow Reynolds number Re of the curved top section of the curved channel, if Re>Rel, it is determined that the water flow in the curved channel is turbulent, enter step (2), if Re≤Rel, the program ends; The flow Reynolds number Re of the river bend section is calculated according to the following formula:

[0125]

[0126] Where Q is the total flow of the curved channel, A is the cross-sectional area of ​​the curved top section, R is the hydraulic radius of the curved top section, X is the wetted area, which refers to the boundary line where the fluid contacts the river on the flowing section of the curved river, and v is the viscosity coefficient with a value of 0.01cm 2 / s; Rel is the critical Reynolds number of turbulent flow, which can...

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Abstract

A method for predicting the flow direction of water depth average flow in flood plain bend channel depending on the relative depth of the meandering channel of the floodplain, The geometry of bendingsection and the position of section to be predicted can be used to predict the average flow direction of water depth in any section between the bending section and the bending top section of bending channel, which not only has high prediction efficiency and accuracy, but also does not need to carry out velocity measurement or other exploration work, and has wide generality in this field. The present invention relates to a method for predicting the flow direction of bending section of bending channel.

Description

technical field [0001] The invention belongs to the field of hydraulics and river dynamics, and relates to a method for predicting the water depth and average water flow direction of a curved river channel, in particular to a method for predicting the water depth average water flow direction between the entrance section and the curved top section of a floodplain curved channel. Background technique [0002] In order to balance incoming sediment and changes in river bed erosion and siltation, the natural channel will evolve into a relatively stable curved channel. During the dry season, the upstream flow is small, and the curved main channel can independently complete the discharge task of the water flow, and the beaches on both sides do not flow. However, during the flood season, the flow from upstream becomes larger, and the curved main channel cannot transport all the flood. At this time, the flood floods over the beaches on both sides to form a floodplain channel, and the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F17/50
CPCG06F30/20Y02A10/40
Inventor 刘超单钰淇刘兴年
Owner SICHUAN UNIV
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