Cold region canal ice period flow test method

A technology for river canals and flow, which is applied in the direction of measuring flow/mass flow, liquid/fluid solid measurement, measuring devices, etc. It can solve the problems of flow velocity distribution and heavy workload, and achieve the effect of reducing workload and improving test efficiency

Active Publication Date: 2020-01-10
CHINA INST OF WATER RESOURCES & HYDROPOWER RES
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AI Technical Summary

Problems solved by technology

If the water surface width of the natural river in the cold area is large and there are many vertical measuring points, such as more than 50 vertical measuring lines, the workload of flow measurement, especially the measurement of the flow velocity distribution at all measuring line positions will undoubtedly be huge

Method used

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  • Cold region canal ice period flow test method
  • Cold region canal ice period flow test method
  • Cold region canal ice period flow test method

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Embodiment

[0035] This embodiment is a method for measuring the ice age discharge of a river channel in a cold region. This embodiment is mainly aimed at wide and shallow river channels, such as figure 1 Shown is a schematic diagram of a certain cross-section M of this kind of wide and shallow channel. The cross section refers to the section perpendicular to the water flow direction.

[0036] When the ice sheet was formed, the water flow changed from open flow to dark flow, and the flow structure changed significantly, such as figure 1 shown. At this time, the flow is generally divided into two layers along the water depth direction by the maximum velocity line (point), which is equivalent to the logarithmic distribution of the open flow, as shown in figure 1 shown by the dotted line. figure 1 Middle: χ b is the wet periphery of the bed surface area, χ i It is the wet periphery of the ice sheet area.

[0037] According to the continuity of water flow, there is any lateral flow Q i...

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Abstract

The invention relates to a cold region canal ice period flow test method. The method comprises the steps of measuring a transverse section, calculating a unit width area, calculating an accumulated area, performing flow parameter derivation, drawing a q<->y-y / B relation curve, performing flow measurement, and calculating a total flow. According to the invention, by utilizing the characteristics that an ice cover obviously influences the vertical flow velocity distribution of a certain point of a river section and basically has no influence on the transverse distribution of the average flow velocity of the water depth of the section, the flow under the ice cover in an ice period of a canal is accurately deduced by utilizing an analytical formula of the average flow velocity of the water depth under the ice cover of the canal along the transverse distribution. Compared with a standard or traditional method, the method has the advantages that the total flow under the ice cover can be solved only by acquiring a section form and measuring the flow velocity distribution at any single point position on the section, the workload of flow velocity observation of all measuring lines is greatly reduced, and the testing efficiency is improved.

Description

technical field [0001] The invention relates to a method for testing flow of rivers and canals in cold regions during the ice age, which is a method for calculating and measuring flow parameters of rivers and canals, and a method for testing natural rivers and open channels for artificial water delivery in winter under ice covers in cold regions. Background technique [0002] More than 60% of the rivers in the higher latitudes of the northern hemisphere will experience icing in winter, and 3 / 4 of China's land north of 30 degrees north latitude has icing. Ice sheets are often formed in winter in natural rivers and artificial large-scale water delivery channels in high-latitude cold regions. When ice sheets are formed, the water flow changes from open flow to undercurrent. Compared with open flow, the flow structure of water changes significantly. Flow rate is one of the important key parameters for hydrological and hydraulic measurement and calculation of rivers and canals. T...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01F1/00G06F17/15
CPCG01F1/002G06F17/15
Inventor 郭新蕾王涛付辉郭永鑫李甲振邹德昊路锦枝胡志鹏
Owner CHINA INST OF WATER RESOURCES & HYDROPOWER RES
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