The application relates to the technical field of
water flow structure detection, and discloses a detection method and
system for the
water flow structure of an indoor water tank
sand wave surface, which comprises the following steps: arranging a
sand wave surface and a test sand
bed, arranging a camera
system and a flow velocity collection probe, collecting image data for
timestamp alignment, performing image recognition to extract
sand wave contours and calculate sand wave state parameters, performing
wavelet denoising and reconstruction on the flow velocity sequence of measuring points, performing
frequency domain analysis to obtain
energy spectrum distribution and calculate energy indexes, determining a
backflow candidate area and a boundary position, performing energy criterion
verification on the
energy spectrum distribution and the energy indexes corresponding to the flow velocity sequence of the measuring points in the
backflow candidate area, merging the measuring point grids that pass the
verification according to
connectivity to generate a
water flow structure partition map and determine water flow structure characteristics, and establishing a response relationship model based on the water flow structure characteristics and the sand wave state parameters. The application improves the recognition robustness of turbulent and vortex structures and improves the accuracy of sand wave
surface water flow structure detection.