基于多波束点云的水下柱桩及桩间距高精度确定方法

受海水介质环境复杂、桩体倾斜以及测量误差大的影响,水下圆柱桩位置的高精度、低成本、高效率确定一直是港口工程建设中的一个难点。为此,提出了一种基于多波束点云的水下圆柱桩及桩间距高精度确定方法。该方法首先基于多波束测量实现桩体及海床点云数据低成本、高效获取。考虑桩体属性信息、点云法向量和高程等几何信息,利用一种综合阈值分割方法实现了桩体点云的有效提取。还提出了顾及桩体形态、测量误差的桩体中心位置综合确定方法,实现桩体相对位置和桩间距的高精度确定。该方法得到了实际工程验证,取得了优于5 cm的桩体相对位置和桩间距确定精度。

Determination of underwater piles,locations and distances by multibeam point cloud

Due to underwater complex environment,pile inclination and large measurement error,the determination of underwater cylindrical pile position with high accuracy,low cost and high efficiency has always been a difficulty in offshore engineering.Therefore,this paper proposes a high-precision determination method of underwater cylindrical piles and their spacing distances based on MBES(Multi-beam echo sounder)point clouds.Firstly,we has obtained positions of pile and seabed with low cost and high efficiency using this method.Then,considering the geometric information(normal vector and elevation)as well as pile attribute information,we realized the effective extraction of pile point clouds using a comprehensive threshold segmentation method.A comprehensive determination method of pile center position considering pile shape and measurement error has put forward to realize the high precision determination of pile position and pile spacing.The method in this paper has been verified by practical engineering,and the determination accuracy of pile position and pile spacing is better than 5 cm.