科研之友
微信
新浪微博
Facebook
分享链接
摘要
This manuscript proposes an algorithm for the reconstruction of the cube armoured rubble mound breakwaters' geometry from incomplete lidar point clouds in order to perform structural monitoring over time. Rubble mound breakwaters are critical structures used in the protection of beaches and ports. The constant wave actions result in the degradation of these defences, causing catastrophic coastal damage. Early detection of the degradation of the breakwaters is a key topic to prevent disasters. Remote-sensing techniques such as lidar and photogrammetry contribute to the monitoring of civil engineering structures. The reconstruction of cube armoured breakwaters relies on normal-vector segmentation and a priori cube's properties. For the successful modelling of the armour units, two options are available, the first one requires three perpendicular planes of the cube to be scanned and segmented, while for the second, only two planes are required. The resulting models were compared to ground truth handmade delineation of 1.25m side length cubed armour units, leading to an accuracy range of 7-15 cm. Besides that, the precision results are constrained to 2.7-9.9 mm for the three plane-based reconstruction and 7.2-14.5 mm for the two plane-based one. The reconstructed armour units are well defined and suitable to be used as a 3D computer-aided design (CAD) model for monitoring breakwaters.
- 出版日期2015-11-10
