Measurements of coherence of sound reflected from ocean sediments
Measurements of coherence of sound reflected from ocean sediments
复制标题
海洋沉积物反射声音相干性的测量
DOI：
--
复制
发表时间：
1980
期刊：
影响因子：
--
通讯作者：
J. Berkson
中科院分区：
文献类型：
--
作者：
J. Berkson
通过悬挂在大洋深处的水听器阵列接收的声音来确定以 50°–70° 掠射角从海底反射的声音的空间相干性。爆炸源和传感器几何形状允许将底部反射与其他路径隔离。相干函数计算为频率 20-250 Hz 和垂直水听器间隔高达 280 m 的函数。一般来说，相干性随着频率的增加和传感器间隔的增加而降低。根据相干性数据估计，塔夫茨深渊平原海底的均方根粗糙度约为 0.5 m，卡斯卡迪亚平原海底的均方根粗糙度约为 0.5 m。粗糙表面散射的测量相干谱与理论相干谱之间的差异可能是由于底部到达的影响和/或有效散射区域随频率的变化。
Spatial coherence of sound reflected from the ocean floor at grazing angles 50 °–70 ° was determined from sound received by a hydrophone array suspended at midocean depths. An explosive source and the sensor geometry allowed isolation of the bottom reflections from other paths. A coherence function was calculated as a function of frequency 20–250 Hz and vertical hydrophone separation up to 280 m. Generally coherence decreases with increasing frequency and increasing sensor separation. The rms roughness of the sea floor was estimated from the coherence data to be about 0.5 m for the Tufts Abyssal Plain and 0.5 m for the Cascadian Plain. Differences between measured coherence spectra and theoretical coherence spectra for rough surface scattering might be due to effects of subbottom arrivals and/or changes in effective scattering area with frequency.