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Device for evaluating erosion influence of fine-grained sediments after dam removal and method for calculating erosion amount

A sediment and fine-grained technology, applied in the direction of measuring devices, instruments, fluid dynamics tests, etc., can solve problems such as the inability to evaluate the impact of dam demolition in the laboratory, and achieve the effect of simple installation and convenient operation

Active Publication Date: 2018-12-04
CHINA THREE GORGES UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The technical problem to be solved by the present invention is to provide a device and calculation method for the impact of dam demolition on fine-grained sediment erosion behind the dam, which can solve the problem that the prior art cannot evaluate the impact of dam demolition in the laboratory, and can simulate the demolition of the upstream dam Finally, the erosion experimental device of fine-grained sand deposited in the reservoir and the method for measuring the amount of erosion can obtain the experimental data of sediment erosion after the dam break in the laboratory

Method used

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  • Device for evaluating erosion influence of fine-grained sediments after dam removal and method for calculating erosion amount
  • Device for evaluating erosion influence of fine-grained sediments after dam removal and method for calculating erosion amount
  • Device for evaluating erosion influence of fine-grained sediments after dam removal and method for calculating erosion amount

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Effect test

Embodiment 1

[0027] Such as Figure 1-Figure 3 As shown, a device for the influence of dam demolition on fine-grained sediment erosion behind the dam includes a regular rectangular water tank 6, one end of the regular rectangular water tank 6 is provided with a water supply device 1, and a dam model is arranged in the regular rectangular water tank 6 behind the water supply device 1 2. The regular rectangular water tank 6 behind the dam model 2 is provided with a hydraulic measuring instrument, the lower part of the regular rectangular water tank 6 is provided with a lifting device 7, and the regular rectangular water tank 6 between the dam model 2 and the water supply device 1 is placed with a fine Granular sand deposits 8.

[0028] Among the hydraulic measuring instruments, the current velocity meter 3 and the suspended sediment sedimentation velocity analyzer 5 are respectively located on both sides of the regular rectangular water tank 6 behind the fine-grained sand. for measuring wat...

Embodiment 2

[0033] A method for calculating the amount of erosion by using the above-mentioned device, the method includes the following steps:

[0034] Step 1: Fill water into the regular rectangular water tank 6 between the dam model 2 and the water supply device 1 until the water exceeds the upper surface of the fine-grained sand accumulation body 8;

[0035] Step 2: Use the measuring cylinder, stopwatch and measuring ruler 4 to measure the incoming water flow rate of the water supply tap, and fill the regular rectangular water tank 6 with water, and draw out the dam model 2 to simulate the dam demolition process while filling the water;

[0036] Step 3: Turn on the current meter 3 and the suspended sediment sedimentation velocity analyzer 5, record the water flow velocity as V, the water depth as H, and the fine sand sedimentation rate as v s ;

[0037] Step 4: Calculate the suspended mass concentration C in the downstream water flow according to the following formula, where the acce...

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Abstract

A device for evaluating the erosion influence of fine-grained sediments after dam removal is provided. The device comprises a regular rectangular water tank. A water supply device is arranged on one end of the regular rectangular water tank. A dam model is arranged in the regular rectangular water tank behind the water supply device. A hydraulic measuring instrument is arranged in the regular rectangular water tank behind the dam model. A lifting device is arranged under the regular rectangular water tank. A fine-grained sand deposit body is placed in the regular rectangular water tank betweenthe dam model and the water supply device. The device for evaluating the erosion influence of fine-grained sediments after dam removal and a method for calculating an erosion amount can solve the problem in the prior art that the influence of dam removal cannot be evaluated in a laboratory, can simulate an erosion experimental device for fine-grained sand deposited in a reservoir and a method formeasuring the erosion amount, and can obtain sediment erosion experimental data after a dam break in the laboratory.

Description

technical field [0001] The invention relates to the technical field of hydraulic model experiment facilities, in particular to a device for affecting the erosion of fine-grained sediment behind a dam by dam removal and a method for calculating the amount of erosion. Background technique [0002] Dam removal has become an important river management measure, and the erosion of a large amount of sediment in the reservoir after the dam removal will become one of the decisive factors for whether to remove the dam. At present, there are many small dams in my country that are about to reach the end of their service life, and some critically ill dams need to be treated urgently. Due to the sandy characteristics of the rivers in northern my country, there is an urgent need for a model that can simulate the erosion process of fine-grained sand after dam demolition to evaluate the impact of demolition. The effect of the dam on the downstream channel. Contents of the invention [0003...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01M10/00
CPCG01M10/00
Inventor 粟一帆李卫明刘德富朱澄浩
Owner CHINA THREE GORGES UNIV
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