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Spillway safety detection system and method based on sheet flow hydrodynamic characteristics

A technology for dynamic characteristics and safety detection, applied in measuring devices, water conservancy projects, optical testing flaws/defects, etc., can solve the problem of spending a lot of manpower and material resources, and achieve the effect of reducing maintenance costs and saving manpower and material resources

Pending Publication Date: 2018-09-14
CHINA INST OF WATER RESOURCES & HYDROPOWER RES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This kind of work generally needs to be done at least once or twice a year, which requires a lot of manpower and material resources.

Method used

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  • Spillway safety detection system and method based on sheet flow hydrodynamic characteristics
  • Spillway safety detection system and method based on sheet flow hydrodynamic characteristics

Examples

Experimental program
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Embodiment 1

[0019] This embodiment is a spillway safety detection system based on the hydrodynamic characteristics of thin-layer water flow, such as figure 1 shown. This embodiment includes: at least one shooting point 2 that is fixed above the spillway 1 and can take a complete image of a section of the bed surface of the spillway, and at least one high-definition camera or video camera is set on the shooting point; The server 3 is provided with an image analysis device and an image comparison device.

[0020] The system described in this embodiment includes two parts, shooting and processing. The shooting point should be set above the spillway, and a section of the spillway can be completely observed, that is, the middle part included by the side walls on both sides of the spillway can be observed. Under normal circumstances, the rolling wave is a relatively complete chain from one bank to the other. Although there may be bifurcations in the middle, it can basically remain intact. The...

Embodiment 2

[0026] This embodiment is an improvement of the first embodiment, and it is a refinement of the first embodiment about the shooting points. The shooting point described in this embodiment is one of a fixed point fixed on a cliff on one side of the spillway, an unmanned aerial vehicle, and a suspension lock for crossing a valley.

[0027] The location of the shooting point must be very determined. Therefore, if it is a UAV shooting, it is necessary to determine the shooting height and precise latitude and longitude of the UAV. Therefore, an altitude measurement device and a longitude and latitude positioning device need to be installed on the UAV. With the use of steel cables, it is only necessary to determine the one-dimensional change of the cable movement, and the shooting point fixed on the cliff, once the installation is confirmed, the position has already been determined. What needs to be determined in the above three cases is the determination of the shooting field of vi...

Embodiment 3

[0029] This embodiment is a spillway safety detection method based on the hydrodynamic characteristics of thin-layer water flow using the system described in the above embodiments. The basic idea of ​​the method is:

[0030] When the spillway discharges the flood with a small flow rate, a rolling wave flow with fixed characteristics will be formed on the slope surface with a thin layer of water. The shape of this rolling wave flow is very sensitive to the shape of the underlying surface: when the shape of the underlying surface remains unchanged, the shape of the rolling wave flow remains unchanged; once the shape of the underlying surface changes, the shape of the rolling wave flow will occur immediately Variety. Using photogrammetry technology to analyze and compare the shape of rolling wave flow will quickly and effectively check whether there are cracks, leakage and other dangerous conditions on the bottom of the spillway.

[0031] The specific steps of the method descri...

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PUM

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Abstract

The invention relates to a spillway safety detection system and method based on sheet flow hydrodynamic characteristics. The method comprises: calibrating an observation position; determining a time zone; determining detection water discharge; relieving water for observation; performing photographing; determining roll wave edges; comparing. The sensitivity of slope sheet flow roll wave to an underlying surface, water discharging on the spillway slope is regularly performed; flow quantity is controlled; stable slope sheet flow roll wave is formed; roll wave change of every water discharging isprecisely determined; by judging wave form changes, it is possible to judge the position of cavitation about to occur. The simple photographing manner is utilized herein and combined with deep researches on roll wave in recent years such that the problem of controlling spillway bed cavitation for years is solved, manpower and material resources are greatly saved, and spillway maintenance cost is greatly reduced.

Description

technical field [0001] The invention relates to a spillway safety detection system and method based on the hydrodynamic characteristics of thin-layer water flow. It is a detection system and method applied in water conservancy projects, and is a safety detection system and early warning for dam spillway erosion damage. method. Background technique [0002] Since the flow of flood discharge from reservoir dams is usually large, in order to ensure the stability of the spillway, a solid rocky valley bottom is usually selected as the foundation of the spillway. However, not all dam sites are located on solid valley bedrock, and the construction of most spillways requires the construction of reinforced concrete spillway beds. The site selection of the topographical position of the dam determines that the initial part of most spillways is a steep slope, and the high-speed and large-flow water flow formed by the steep slope is the main reason for the cavitation damage of the spill...

Claims

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Application Information

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IPC IPC(8): G01N21/88G06T7/00G06T7/13G06T5/50E02B8/06
CPCG06T5/50G06T7/0002G06T7/13G01N21/8851E02B8/06G01N2021/8887G06T2207/20221G06T2207/10004
Inventor 龚家国赵勇杨苗冶运涛王英翟正丽赵翠平
Owner CHINA INST OF WATER RESOURCES & HYDROPOWER RES
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