High-Resolution Acoustic Multibeam Surveys for Bridge Assessment

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Figure6. Top Panel ‐ Point cloudimage of one of the structural supports for the bridge over theKennebec River near Richmond,ME. The point cloud image includes all of the valid multibeamsoundings and provides a higher resolution view of a particular area. Relatively significant scourcan be seen along the leading edge of the footing for thiss support. Bottom Panel ‐ Point cloudimageof another structural support showinga prominent obstruction adjacent to the support.In addition to the large obstruction, extensive debris (e.g., logs, rubble, etc.) is also evidentaround this support. In this case, the more significant scour is occurring around theoutside ofthe obstruction.14
Figure7. The top photo shows the center support for the Sheepscot River Railroad Bridge whilethe photo at left shows a close‐uoverhead view and a rotated view looking downstream. Some Initialview looking upriver att the support. The two point cloud dataaimages include anconcerns about thewavy appearance of the point cloud images were resolved at low tide whenthe deteriorating remnants of the original sheet pile formcould be seen at the water line. Thepoint cloud results reflected thesheet pile form and not the main stone supports.15
Page 2 and 3: with all 256 beams focused within t
Page 4 and 5: MULTIBEAM SURVEY CHALLENGES AROUND
Page 6 and 7: comparative multibeam survey and sc
Page 8 and 9: Tables and Figures8
Page 10 and 11: Figure 1. A hillshade bathymetric s
Page 12 and 13: Figure 4. Rotatedcolor hillshade ba
Page 16: Color hillshade surface model of th

High-Resolution Acoustic Multibeam Surveys for Bridge Assessment

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