声源深度对印度洋声传播的影响分析

以分析声源深度对印度洋主要航线海区声传播的影响为研究目的,应用WOA13季节平均数据和Mackenzie声速经验公式,分析印度洋冬季(1月~3月)声道轴深度、最小声速值、表层声速值的分布;在季节、声源频率和掠射角等因素确定的情况下,通过BELLHOP模型仿真计算研究主要航线上选用位置点不同深度声源的声传播规律:印度洋35°S航线海区5 m深度声源的汇聚区位置要大于其以北航线海区的汇聚区位置;印度洋15°S以北航线海区的100 m以下深度的汇聚区较为固定;15°S航线海区100 m和4 000 m声源深度的情况与以北航线海区相同,250~3 000 m深度则出现缩小;35°S航线海区,汇聚区位置随声源深度向声道轴深度靠近而出现明显的缩小。最后为水面舰船声呐提出了使用意见。

Analysis of influence of acoustic propagationin the Indian Oceanbase on sound source depth

For the researching purpose of analyzing the acoustic propagation for the main sea routes in the Indian Ocean based on sound source depth, by using the average data of WOA13 and the Mackenzie empirical sound speed equation, analyzed the distribution of values corresponding to sound channel, minimal sound speed and surface sound speed of the Indian Ocean in winter (from January to March) firstly, then studied the laws of acoustic propagation in different sound source depth in chosen location of main sea routes by using the BELLHOP model, under the circumstances of given factors of season, sound source frequency and grazing angle: The convergence zone locations of 5 m sound source in 35°S sea route areas were greater than the locations in areas north of 35°S in the Indian Ocean. The convergence zones were relatively fixed below 100 m sound source depth in sea route areas north of 15°S. The situation of 100 m and 4000 m sound source depth in sea route areas of 15°S was same as the areas north of 15°S, but the convergence zones of 250 m to 3000 m sound source depth decreased. In areas of 35°S, the convergence zones decreased significantly with sound source depth approached the sound channel. Finally, proposed the usages for sonar of surface ships.