摘要
不同海区海水温度不同,导致不同海区沉积物温度不同;实验室环境温度变化造成沉积物温度的变化。模拟沉积物的温度变化来研究沉积物声衰减的变化,分别从声衰减系数和本文提出的温变衰减系数描述声衰减。以原状样品和人工样品为例说明了在一定厚度的海底沉积物中,声波的传播能力受到沉积物本身分布的均匀度的影响,会出现不同的衰减趋势;通过定义温变衰减系数得到了海底沉积物对能量的传播能力随温度的升高而降低。
The temperature difference between sea areas cause seafloor sediments＇ temperature not identical. Similarly the environmental temperature change in laboratory causes the change of sediment sample＇s temperature. The variation of acoustic attenuation of sediments has been studied by simulating the temperature change of sediments. A temperature varying attenuation coefficient is put forward to show the variation of acoustic attenuation at a certain spot in sediments. And the acoustic attenuation is described by the acoustic attenuation coefficient and the temperature varying attenuation coefficient respectively. With the sediment sample in previous condition the effect of the temperature uniformity within sediments on the sound energy transmission is explained. Different attenuation tendencies can be seen, and the transmission ability of sound energy in sediments decreases with the increase of sediment temperature.
出处
《声学技术》
CSCD
北大核心
2008年第5期631-635,共5页
Technical Acoustics
基金
国家自然科学基金项目(40676040,40476020)
关键词
海底沉积物
声衰减
温度
声学测量
seafloor sediments
acoustic attenuation
temperature
acoustic measurement
