| 摘要: |
| 分析研究了国内外海底松散泥沙的声速和声衰减系数测量的研究现状，并据此研制了海底表层沉积物声速声衰减系数原位测量系统。利用原位测量系统分别在实验室和海滩对不同粒度的沉积物进行了测量分析，得到了不同粒度沉积物的声速和声衰减系数。数据分析表明，沉积物的声速和声衰减系数与沉积物的粒径有密切的关系，粒径越粗，声速越高，声衰减系数越大。通过沉积物声学性质研究，可以开发海底浅层沉积物声学性质原位测量技术，提高相关海洋调查的速度和效率。 |
| 关键词: 沉积物声速 声衰减 原位测量 |
| DOI： |
| 分类号: |
| 基金项目:国家863 计划项目(2006AA09Z116) |
|
| Experimental research of in situ acoustic properties measurement of seafloor unconsolidated sediment |
|
|
| Abstract: |
| In this paper, we analyse the measurement method of compressional wave velocity and acoustic attenuation in unconsolidated seafloor sediment, and develope an in situ measurement system based on this analysis. Experiments in laboratory and sea beach are conducted separately. In this experiment, compressional wave velocity and attenuation coefficient are measured using this system. By analyzing the acoustic data acquired, we get conclusions that the grain sizes affect obviously the compressional velocity and attenuation coefficient, the increase of grain size will cause a high speed and a strong attenuation. The research in this paper can be used to develop the technology of in-situ measurement of seabottom sediment acoustic properties, which may develop the efficiency of the seabottom investigation greatly. |
| Key words: sediment compressional velocity acoustic attenuation in situ measurement |
