Three-Dimensional Visualization of Multibeam Survey Lines Based on Theoretical Derivation and Simulation

This paper studies the modeling and application of multibeam bathymetry. Firstly, considering the influence of slope on the multibeam bathymetric system, mathematical models of coverage width and overlap rate between adjacent strips of multibeam bathymetry are established, and parameters such as seawater depth, coverage width and overlap rate corresponding to the distance of different survey lines from the center point are calculated. Then, the influence of the angle between the direction of the survey line and the projection of the normal direction of the seabed slope in the horizontal plane is taken into account to evaluate the effect of multibeam bathymetry in a more complex three-dimensional environment, and the size of the coverage widths corresponding to the distances at different angles is calculated. Again, a set of survey lines with the shortest measuring length, which can completely cover the whole sea area to be measured and with an overlap rate of 100%~20%, are designed according to the parameters of the sea area conditions, and the methods of calculating the coverage width and the spacing of the lines are determined through mathematical models to give the surveying line scheme. Finally, a three-dimensional seabed topographic model was constructed to depict the seabed topographic features in detail. In order to meet the requirements of minimizing the total length of the survey lines, covering the entire sea area to be surveyed, and controlling the overlap rate of adjacent strips to be less than 20%, the optimal direction and spacing of the survey lines were defined, and an iterative method was used to find the optimal direction and spacing of the survey lines.