Real-time monitoring method for topographic evolution of jet flow scour pit based on picture processing

Abstract

The invention discloses a real-time monitoring method for topographic evolution of a jet flow scour pit based on picture processing. The real-time monitoring method comprises the following steps: (1)manufacturing a rectangular frame and welding grids; (2) tying weaving lines at the intersection points of the steel wire mesh lines; (3) numbering the intersection points tied with the weaving lines;(4) horizontally placing the rectangular frame at a sufficient height right above the position where the scour pit is to be formed; (5) taking a picture at a proper angle, so that the complete terrain, frame, steel wire and weaving lines can be displayed in the picture; (6) placing the picture in CAD, extending any weaving line to enable the weaving line to intersect with the topographic line, and solving the topographic elevation of the point by solving the length of the extension line; and (7) processing the pictures at different moments to obtain a three-dimensional scour pit bottom slopetopographic map at different moments. The real-time monitoring method for the topographic evolution of the jet scour pit based on picture processing can realize a real-time (dynamic) evolution process, and is economical, convenient and relatively high in 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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