摘要
应用BELLHOP模式,对声速剖面的声跃层结构变化引起会聚区偏移特征进行了分析.结果表明,声速垂直结构的变化可导致会聚区位置出现不同程度的偏移：跃层强度增加0.01 s-1将使会聚区向远离声源方向偏移1.5 ～2.0km;跃层厚度增大50m将使会聚区向靠近声源方向偏移0.3～0.5km;跃层位置加深l00m将使会聚区向远离声源方向偏移0.5～1.0km.在跃层的三个特征量中,跃层强度起主导作用.跃层强度变化引起的声线在海洋次表层的偏折差异,进而导致进入深海等温层的入射角差异,是使会聚区发生偏移的决定性因素.
Based on BELLHOP model, the convergence zone（CZ） propagation was analyzed in conditions of sound speed profile （SSP） with different sound spring layer （SSL）. The results showed that different structure of SSL should account tbr the shift of CZ. The CZ was 1.5 - 2.0km shifted away from source corresponding to 0.01 s-1 increase of intensify of SSL,and 0.3 -0.5km shifted near to source corresponding to 50m increase of thickness of SSL,and 0.5 - 1.0kin shifted away from source corresponding to 100m increase of depth of SSL. In comparison,intensify was the dominating factor between three parameters of SSL. The change of intensify of SSL made ray beams refract to different extent in sub-surface, and reach deep isothermal layer with different angles,and finally resulted in shift of CZ.
出处
《海洋测绘》
2014年第1期40-42,共3页
Hydrographic Surveying and Charting
关键词
声跃层
声速剖面
会聚区
BELLHOP模式
sound spring layer
sound speed profile
convergence zone
BELLHOP model
