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A Method for Predicting the Length of Sediment Deposition Area at the Tail End of River Vegetation Group

A prediction method and technology of deposition area, applied in the fields of hydraulics and river dynamics, can solve the problem of predicting the length of sediment deposition area at the end of submerged vegetation group

Active Publication Date: 2019-07-23
SICHUAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, at present, there is no effective method at home and abroad to predict the length of the sediment deposition zone at the end of the submerged vegetation group.

Method used

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  • A Method for Predicting the Length of Sediment Deposition Area at the Tail End of River Vegetation Group
  • A Method for Predicting the Length of Sediment Deposition Area at the Tail End of River Vegetation Group
  • A Method for Predicting the Length of Sediment Deposition Area at the Tail End of River Vegetation Group

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0052] In this embodiment, the judgment conditions for predicting the length of the sediment deposition area at the tail end of the channel vegetation group are determined by simulating the sediment deposition test of the river channel.

[0053] ①Test purpose

[0054] The length of the sediment deposition area at the tail end of the vegetation group was determined through the flume test under 12 groups of working conditions, and the obtained test results were summarized to propose a prediction method for the length of the sediment deposition area at the tail end of the high-density vegetation group.

[0055] ② Test equipment

[0056] The main equipment is shown in Table 1.

[0057] Table 1 Instruments and equipment used in sediment deposition test and flow velocity measurement

[0058]

[0059] ③Test conditions

[0060] Table 2 Sediment deposition test and ADV velocity measurement working conditions

[0061] Condition u 0 (cm / s)

D (cm) h(cm) H(cm) ...

Embodiment 2

[0102] The verification test working condition that embodiment 2 laboratory carries out

[0103] In this embodiment, three sets of supplementary experiments are further designed to verify the validity of the method for predicting the length of the sediment deposition area at the tail end of the channel vegetation group. Three groups of tests were carried out in a straight flume with a width of 1.2m and a water depth of 13.5cm. The average velocity of the upstream flow was U 0 = 9.5 cm / s. The density of the three groups of vegetation groups is the same, all a=0.2cm -1 . The designed non-submerged vegetation group (working condition Y1) has η(C d aD)=8.4, satisfying the judgment condition of high-density non-vegetation group (η>4); the designed submerged vegetation group (working conditions Y2 and Y3) has ah=2.2, meeting the judgment of high-density submerged vegetation group (ah>0.1) condition. The initial concentration of suspended sediment particles in the test is 135g / m...

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Abstract

The invention discloses a predication method for the length of a river channel vegetation group tail end sediment deposition area. The method includes the steps that firstly, the width D and the height h of a high-density vegetation group are measured; and the length of the vegetation group tail end sediment deposition area is predicated according to the width and height comparison of the vegetation group. The predication method for the length of the river channel vegetation group tail end sediment deposition area is simple and accurate, in addition, sediment deposition testing or long-term field observation do not need to be carried out any more, and the predication method has wider universality in the field.

Description

technical field [0001] The invention belongs to the field of hydraulics and river dynamics, and relates to a method for predicting the length of a sediment deposition area at the tail end of a channel vegetation group. Background technique [0002] There are usually a large number of vegetation groups in natural rivers, and the vegetation groups are generally the initial growth form of aquatic plant communities. Plants grow concentrated, and the community shows an approximately circular shape. These vegetation groups grow in the river flow area, usually in a submerged state. A complex three-dimensional vortex structure will appear at the end of the submerged vegetation group, and these vortices are composed of horizontal vortexes along the horizontal direction (Karman vortex street) and vertical vortexes along the vertical direction; There will be a certain distance at the end of the vegetation group, that is, the wake area; the horizontal vortex and the vertical eddy joint...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06Q90/00E02B1/02
CPCE02B1/02
Inventor 刘超单钰淇刘兴年杨克君
Owner SICHUAN UNIV