海洋测量水下拖曳设备的位置计算方法研究

针对海洋测量水下拖曳设备位置确定问题,综合考虑拖缆受力、海流影响以及水下拖体的运动性质,建立了水下拖曳设备的位置计算模型,并仿真计算分析了测量船在不同航行状态下拖曳设备位置确定的规律,探讨了不同海流效应对拖曳设备位置确定的影响。仿真计算结果表明,在海洋动态环境作用下,拖缆各方向的偏移明显呈曲线形状,非简单几何运算所确定。测船各方向的运动均可对水下拖体的位置在相应方向产生一定影响,而水下拖体位置的变化量小于测船拖点位置的变化量。海流对水下拖曳设备定位可造成数米的偏差,需进行相应改正。建议可考虑采取船载式ADCP实时测流辅助水下拖曳设备定位的工作模式。

A Position Computation Method of Underwater Towed System for Oceanographic Survey

In terms of the positioning problem of underwater towed system during various sea dynamic conditions,the compensation model including the factors of cable mechanics,current effect and towed system moving character,is deduced in this paper.The simulations reveal that,the shape of towed cable has been curved,which can not be determined by simple geometric analysis.The motion of the vessel in all directions can affect the position of the underwater towed body in the corresponding direction,and the change of the position of the underwater towed body is less than that of the towing point.The effect of current can result in large errors in positioning of underwater towed system,which can be up to several meters or much higher and need to be corrected during the underwater towed system positioning.Hence,it is beneficial to adopt the ADCP during the survey for underwater towed system positioning.