Correction for effects of temperature and pressure on sound speed in shallow seafloor sediments
Correction for effects of temperature and pressure on sound speed in shallow seafloor sediments
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DOI：
10.1080/1064119x.2018.1545812
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发表时间：
2019-02
影响因子：
2.2
通讯作者：
G. Kan;D. Zou;Baohua Liu;Jingqiang Wang;Xiangmei Meng;Guanbao Li;Y. Pei
中科院分区：
文献类型：
--
作者：
G. Kan;D. Zou;Baohua Liu;Jingqiang Wang;Xiangmei Meng;Guanbao Li;Y. Pei
摘要在实验室条件下，对三种不同类型的沉积物在不同温度和压力条件下的声速进行了测量。分析了温度和压力对沉积物中声速的影响及其变化趋势。结果表明，随着温度和压力的增加，声速在所有选定的沉积物中呈现出增加的趋势。对于每个样品，沉积物中的声速与海水中的声速之比在不同的压力和温度下几乎保持不变，温度依赖性的最大波动为1.09%，压力依赖性的最大波动为0.68%。结合实验结果分析和汉密尔顿给出的声速修正步骤，给出了声速对温度和压力的具体修正公式。利用修正公式对实验室测量的声速和南黄海测量的声速进行了修正，以减小温度和压力的影响。结果表明，常声速比修正公式对修正温度和压力变化引起的声速测量误差是有效的。作为进一步的考虑，声速比的波动对声速校正的影响进行了分析。
Abstract Three types of sediments were selected to measure their sound speed under changing temperature and pressure conditions in laboratory. The effects of temperature and pressure on sound speed in sediments and their trends were analyzed. The results showed that, with increasing temperature and pressure, the sound speed exhibits an increasing trend in all selected sediments. For each sample, the ratio of the sound speed in sediments to that in seawater almost remained unchanged at different pressures and temperatures, with a maximum fluctuation of 1.09% for temperature dependence and 0.68% pressure dependence. Combining the analysis of experimental results and sound speed correction procedure given by Hamilton, specific correction formulas of sound speed for temperature and pressure were presented. The laboratory-measured sound speed in the experiment and the sound speed obtained in the South Yellow Sea were corrected to reduce the effects of temperature and pressure using the correction formulas. The results show that the correction formulas with constant sound speed ratio are effective for correcting the sound speed measurement errors caused by changes in temperature and pressure. As a further consideration, the effects of the fluctuation of sound speed ratio on sound speed correction were analyzed.