多波束在水下桩体点云获取中的应用

Application of multi-beam in underwater pile point cloud acquisition

随着装配式码头工程的增加,水下桩体的安放状态正成为关注的焦点。然而,由于受海水隔断,高效、低成本、高精度的桩体状态监测方法相对较少。因此,本文提出利用多波束获取水下桩体点云方法,主要包括GNSS RTK多波束测深技术,顾及桩体形态、分布和多波束测量原理的多波束测线布设方法,基于K-means++的桩体点云具备聚类方法以及桩体形状、回波强度阈值约束的桩体点云分割和滤波方法。实际应用结果表明:基于该方法可以获取高精度桩体点云,得到桩体的状态参数,取得桩体中心坐标x和y方向偏差小于5 cm、半径偏差小于4.5 cm的精度,验证了该方法的正确性和有效性。

With the increase of prefabricated docks projects,the placement state of underwater piles is becoming the focus of attention.However,due to the isolation by seawater,there are relatively few efficient,low-cost and high-precision methods for monitoring the condition of piles.This paper proposes a method to obtain underwater pile point cloud by using multi-beam bathymetric system(MBS),which includes the GNSS RTK multi-beam sounding technology,the survey line layout taking into account the shapes and distributions of underwater piles and MBS measurement principle,and the clustering point cloud of the monitored pile by K-means++and the pile point cloud segmentation and filtering by considering the pile shape and MBS backscatter strength.The practical application results show that based on this method,the high-precision point cloud of the pile can be obtained,the state parameters of the pile are obtained,and the accuracy of the deviation in the x and y directions of the pile center is less than 5 cm,and the radius deviation is less than 4.5 cm,which verifies the correctness and effectiveness of this method.