| 凌鸿烈,孙耀秋,杨挺.长江口和杭州湾浮泥声参数测量[J].声学技术,1997,(4):194~197 |
| 长江口和杭州湾浮泥声参数测量 |
| Measurements of acoustic parameters of fluid-mud in Changjiang Estuary and Hangzhou Gulf |
| 投稿时间：1997-04-01 |
| DOI： |
| 中文关键词: 浮泥 声参数测量 |
| 英文关键词: fluid mud measurements of acoustic parameters. |
| 基金项目:上海市自然科学基金;国济大学海洋地质开放实验室基金 |
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| 中文摘要: |
| 本文报导了用4种频率(100kHz、150kHz、500kHz和1500kHz)的超声波,对长江口和杭州湾的水底浮泥在不同重度下测得的声速和重度之间、声衰减与重度之间以及在一定重度下频率与声衰减之间的变化关系曲线。实验结果表明:在相同条件下,杭州湾浮泥的声衰减比长江口浮泥的声衰减大一点(约10%)。在重度10.0～16.0kN/m3之间,声衰减与重度成线性关系,声衰减与频率约成一次方关系;声速随重度的增加变化不大(约±2%),在低频率(100kHz和150kHz)上出现一个明显的极小值,例如,长江口浮泥重度14.5kN/m3时,声速最小,约为1460m/s,杭州湾浮泥重度13.5kN/m3时,声速最小,约为1440m/s。 |
| 英文摘要: |
| The acoustic attenuation coefficients and velocities of fluid-mud collected from Changjiang Estuary and Hangzhou Gulf respectively have been measured with ultrasonic waves of 4 frequencies (100,150,500 and 1500kHz)in a water tank. The results show that the linear variations of acoustic attenuation coefficients with bulk densities of fluid-mud in the range of 10.0~16.0kN/m3 for a certain frequency and with frequencies for a certain bulk density are confirmed, that the attenuation coefficient of fluid-mud in Hangzhou Gulf is a little more (about 10%) than that in Changjiang Estuary for a certain bulk density at the same frequency, and that the variation of acoustic velocities with bulk densities in the range of 10.0~16.0kN/m3 is slight (about ±2%) and a minimun of velocity can be clearly found at 100kHz and 150kHz frequencies, e.g.1460m/s vs14.5kN/m3 in Changjiang Estuary and 1440m/s vs13.5kN/m3 in Hangzhou Gulf. |
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