A method for real-time monitoring of terrain evolution based on image processing

Abstract

The invention discloses a method for real-time monitoring of topographical evolution of pick-up jets and pits based on image processing, comprising the following steps: (1) making a rectangular frame and welding grids; (2) tying textile lines at the intersection points of steel mesh lines; (3) Number the intersection points where the textile threads are tied; (4) Place the rectangular frame horizontally at a sufficient height directly above the position where the punching hole will be formed; (5) Take a photo at a suitable angle so that the complete Terrain, frame, steel wire, textile line; (6) Place the picture in CAD, extend any textile line so that it intersects with the terrain line, and obtain the length of the extension line to obtain the terrain elevation of the point; (7 ) by performing the above processing on the photos at different times, a three-dimensional topographic map of the bottom slope of the crater at different times can be obtained. The method for real-time monitoring of topography evolution based on image processing of the jet-jet scouring pit of the present invention can realize the real-time (dynamic) evolution process, is economical and convenient, and has high precision.

Description

technical field [0001] The invention relates to a method for real-time monitoring of topographic evolution of jet stream scoured pits based on image processing, belonging to the field of water conservancy and hydropower engineering. Background technique [0002] Scouring pits are bound to be formed when the water tongue of the protruding jet is connected with the water flow at the downstream channel or dam foundation. As we all know, for the pick-up jet, the energy dissipation lies in three parts: the incoming flow to the front section of the energy dissipator, the energy dissipation in the air and the energy consumption of the downstream tumbling scour, while about 50%-80% of the energy is in the scour pit dissipate. The mixture of complex hydraulic conditions such as huge and unstable hydrodynamic pressure fluctuations, aeration, turbulence, and submerged tumbling, as well as the multi-scale spatial geological conditions of the riverbed, make the erosion of the channel an...

AI Technical Summary

Problems solved by technology

The specific shape of the crater, including the measurement of important characteristic parameters such as the maximum crater depth, is very complicated

At present, the existing technology of hydraulic model test is to measure the scouring pit downstream of the jet flow after several hours of continuous scouring, and then measure the terrain after the scouring pit reaches equilibrium. The measuring instruments are all conventional tapes, and the accuracy of important indicators such as the shape of the scoured pit, the maximum scoured pit depth and the maximum sedimentation height cannot be guaranteed.

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