| 摘要: |
| 采用同轴差距测量法对南沙海域海底沉积物取样进行甲板现场声学测量, 并计算了声速, 结合沉积物取样分析获得的孔隙度, 研究了海底表层100 cm 沉积物的声速和孔隙度之间的相互关系, 分析获得了孔隙度与海底沉积物声速关系的经验公式, 结果表明此海域沉积物声速的临界孔隙度为67.80%。将此公式与国内外其他学者建立的经验公式进行了对比, 分析发现各预测方程之间存在着差异, 说明不同海域的沉积物声学特性具有差异性, 经验公式具有区域性, 同时分析了其他影响声速的因素。此项工作对于建立和研究南海声场环境具有重要意义。 |
| 关键词: 南沙海域 海底沉积物 声速 孔隙度 |
| DOI： |
| 分类号: |
| 基金项目:海洋公益性科研项目(200905025); 南海海底底质调查研究项目 |
|
| Surface sediments acoustic velocity and porosity correlation in Nansha sea area abyssal region |
|
|
| Abstract: |
| We used coaxial differential distance attenuation measurement to measure acoustic properties of Nansha sea area marine sediment on deck and calculate sound velocity, combined with laboratory measurement of sediment porosity, studied the correlation between submarine surface 100 cm sediment velocity and porosity, set up an empirical formula by using porosity to predict submarine sediment velocity, and found the sediment critical porosity in Nansha sea area is 67.8%. Comparing with other formulas built by Chinese or foreign scholars, we found there is difference between the prediction equations, suggesting that there is difference between different sea sediment acoustic property, and the experience formula has regional restriction. In addition, some other factors influencing sound velocity were also analyzed. This work is of great significance to study and establish the sound field environment of the South China Sea. |
| Key words: Nansha sea area marine sediment acoustic velocity porosity |
