UTILIZING UNDERWATER POINT CLOUD DATA EXAMINATION FOR WORKING FORM INSPECTION

Abstract

 Narrow multi-beam surveying (hereinafter abbreviated as NMB) is being put to practical use as a technology that can visualize underwater parts, and is being put to practical use in ICT dredging work completion inspection and ICT foundation work quantity calculation. However, the completed inspection of the rubble mound has not been realized. This is largely due to the complicated shape of the rubble mound, the high accuracy required for management standards, and the point cloud characteristics of NMB. Therefore, in this study, we examined the construction of a finished product inspection method based on the NMB point cloud characteristics of the rubble mound.

 As a result, it became clear that the unevenness of the rubble mound was dominant in the influence on the acquisition point cloud of the NMB survey for the rubble mound. We constructed a method to calculate the evaluation value from the point cloud, which enables the evaluation of slope height, extension, and width. This made it possible to evaluate the entire rubble mound.