琉球群岛附近海域声场分析

代民果; 黄大吉; 章本照

琉球群岛附近海域声场分析

1.
国家海洋局海洋动力过程与卫星海洋学重点实验室(LOPSO), 浙江, 杭州, 310012;国家海洋局第二海洋研究所, 浙江, 杭州, 310012;浙江大学流体工程研究所, 浙江, 杭州, 3100271. 国家海洋局海洋动力过程与卫星海洋学重点实验室(LOPSO), 浙江, 杭州, 310012
2.
国家海洋局海洋动力过程与卫星海洋学重点实验室(LOPSO), 浙江, 杭州, 310012;国家海洋局第二海洋研究所, 浙江, 杭州, 310012
3.
浙江大学流体工程研究所, 浙江, 杭州, 310027

基金项目: 国家自然科学基金资助项目(40076010);国家重点基础研究发展规划资助项目(G1999043701)

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出版历程
- 收稿日期: 2003-07-30
- 修回日期: 2004-02-27

Analyses of sound velocity field in sea area by Ryūkyū-guntō

1.
Laboratory of Ocean Dynamic Processes and Satellite Oceanography of State Oceanic Administration, Hangzhou 310012, China;Second Institute of Oceanography, State Oceanic Administration, Hangzhou 310012, China;Institute of Fluid Dynamics, Zhejiang University, Hangzhou 310027, China1. Laboratory of Ocean Dynamic Processes and Satellite Oceanography of State Oceanic Administration, Hangzhou 310012, China
2.
Laboratory of Ocean Dynamic Processes and Satellite Oceanography of State Oceanic Administration, Hangzhou 310012, China;Second Institute of Oceanography, State Oceanic Administration, Hangzhou 310012, China
3.
Institute of Fluid Dynamics, Zhejiang University, Hangzhou 310027, China

摘要

摘要: 利用美国海军的GDEM(generalized digital environm ental model)数据对琉球群岛附近海域声场进行了研究,分析了该海域声速最小值分布及其对应深度的分布规律;研究了横跨和穿越宫古水道两个断面上上述声场特征的变化,结果表明杭州湾以北的沿岸约30m地形等深线内,冬、春、秋季声速最小值出现在海面,并且有较为稳定的表面声道;夏季闽浙沿岸约30m地形等深线内,声速最小值出现在海面.奄美群岛、冲绳岛东侧130km范围内有很强的海水混合,上升流很明显,导致声速最小值出现的深度在冬夏比在春秋的深400m.
- 琉球群岛 /
- 声速剖面 /
- 声道轴 /
- 声道 /
- 表面声道
Abstract: The sound velocity field in a sea area near the Ry ky-gunt is stuidied by accessing generalized digital environm entalmodel data base.The distribution rules about the depth corresponding to the minmial sound velocity value are analyzed particularly.Profile a long the Guntu A rchipelago and profile across Amami-shot are studied to find out the above characteristic variations of them.There are series of conclusions.First,there is a sea area about the north of the Hangzhou Bay coaswtise area where the minmial sound velocity value always appears on the sea sur-face in winter,spring and autumn and steady surface sound channel exists.Along the coast of Zhejiag and Fujian Province,China,in the range of 30 m topography isoline,the minmial sound velocity value appears on the sea surface in summer.Second,seawater mixed very strongly and ascendant flow stood out in the 130 km range of the eastern Okinawa-shot.It lead to that the minmial sound velocity depth value in winter and summer is 400 m greater than that in spring and autumn.
- Ryky-gunt /
- minmial sound velocity value /
- depth corresponding to minmial sound velocity value /
- deep-water sound channel /
- sound transm ission