【摘要】 利用2004年10-12月一个航次的测量数据,分析了长江口附近某海区的声速结构特点,发现该海域的声速结构受长江冲淡水的影响非常大,随着潮汐的变化,声速日变化量较大,具有类似潮周期现象,即随着落潮大量淡水和泥沙的注入以及涨潮时新鲜海水的补充,声速的时空变化较大,致使多波束系统的波束导向和声线跟踪偏差较大,很大程度的地影响了多波束系统的勘测精度(特别是边缘波束对应的水深数据误差更大)。针对于此,给出了几点改进建议。更多还原

【Abstract】 The characteristics of the Sound Velocity Profile (SVP) near the Changjiang River estuary were analyzed by using the data collected in Oct. —Dec., 2004. It is shown that the structure of SVP is heavily influenced by the diluted water of the Changjiang River, and it changes quickly with the tide each day. Its effect on the multibeam echo sounding is analyzed, and some proposals are put forward.更多还原