The Application of 3D Laser Scanning and Unmanned Ship Sounding in the Reexamination of Reservoir Storage Capacity

In order to accurately measure the reservoir capacity after siltation, this paper uses the ground 3D laser scanning system to obtain the topography above the water surface and the unmanned ship sounding system to obtain the topography below the water surface. then carry out the accurate review of the reservoir capacity through the combination model of water and underwater. The blind area of measurement is caused by the change of water level and detection conditions, which leads to measurement error. combined with the measured data of surface and underwater topography, the complete reservoir water level-area curve is obtained by water level-area fitting and contour interpolation fitting respectively, the error caused by blind area is minimized, and finally the reservoir capacity review is carried out according to the contour volume method. Practice has proved that the use of contour interpolation fitting method can greatly improve the credibility of the reservoir capacity review results, provide accurate and reliable basic data for reservoir management units, and provide support for reservoir flood control and operation.