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River vegetation group wake zone length measurement method

A technology of length measurement and vegetation, applied in the field of hydraulics and river dynamics, to achieve the effect of improving test efficiency, high accuracy and simple implementation steps

Active Publication Date: 2017-06-27
SICHUAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, no efficient, fast and simple method for determining the vegetation wake area has been proposed at home and abroad.

Method used

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  • River vegetation group wake zone length measurement method
  • River vegetation group wake zone length measurement method
  • River vegetation group wake zone length measurement method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] In this embodiment, the method for measuring the length of the wake region of the vegetation group in the river channel is described through a flume simulation experiment.

[0048] ①Test purpose

[0049] Through the flume test, the movement process of the wake vortex of the vegetation group was revealed, and the fluorescent tracer was used to record the video, and the length of the wake area of ​​the vegetation group was calculated through image processing. Compare the results obtained by the inventive method with the actual measurement results to verify the accuracy of the inventive detection results.

[0050] ② Test equipment

[0051] The main equipment is shown in the table below.

[0052] Table 1 The instruments and equipment used in the inspection test of fluorescent agent tracer results

[0053]

[0054]

[0055] ③Test conditions

[0056] Table 2 Fluorescent tracer and ADV flow rate measurement working conditions a

[0057] D (cm) h(cm) ...

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Abstract

The invention discloses a river vegetation group wake zone length measurement method. A fluorescence tracer is utilized to trace motion locus of vegetation group wake whirlpools, and motion process videos of the vegetation group wake whirlpools are acquired; a Matlab program and a video processing code are utilized to convert chroma of the fluorescence tracer into a corresponding value, and standard deviation of the fluorescence tracer chroma and a current direction standard deviation trend line are calculated; the position of a vegetation group tail end and a riverbed mark point in standard deviation distribution are determined according to the standard deviation trend line; length Lvv of a wake zone generated by vertical whirlpools is calculated according to a formula Lvv=(L1+L2) / 2+ / -(L2-L1) / 2; length Lkv of a wake zone generated by horizontal whirlpools is calculated according to a formula Lkv=(L3+L4) / 2+ / -(L4-L3) / 2; length of a wake zone of a submerged vegetation group is Lw=min(Lvv, Lkv), and length of a wake zone of a non-submerged vegetation group is Lw=Lkv. The method is advantaged in that the method is simple, length of the wake zone of the submerged or non-submerged vegetation group can be rapidly and accurately measured.

Description

technical field [0001] The invention belongs to the fields of hydraulics and river dynamics, and in particular relates to a method for measuring the length of the wake area of ​​a river channel vegetation group. Background technique [0002] In nature, vegetation group usually refers to the initial growth form of trees, shrubs and weeds. Vegetation usually grows in the flow area of ​​the river channel, which will affect the water flow characteristics and the shape of the river bed in the surrounding area for a long time. In the natural environment, vegetation groups promote sediment deposition in local areas by changing the characteristics of water flow, and change the law of river bed evolution. The study of vegetation group is of great significance to explore the water flow structure, resistance characteristics and river bed evolution law in the area where it is located. Among them, the length of the wake area of ​​the vegetation group is the distance from the tail end o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01B21/02
CPCG01B21/02
Inventor 刘超单钰淇刘兴年杨克君王协康
Owner SICHUAN UNIV
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