南海南部海域岛礁区海底珊瑚砂声速影响因素的初步研究

A preliminary study of the sound velocity influence factors of submarine coral sand of islands sea area in southern South China Sea

通过对南海南部海域岛礁区科学考察数据资料的分析研究,得出了岛礁区海底珊瑚砂的纵波声速随孔隙度、含水量增大而减小,以及声速随中值粒径、湿密度增大而增大的统计结果,并在Biot和Wyllie的松散饱和水沉积物声速理论公式与模型基础上,解释了物理力学因素对海底珊瑚砂声速的影响机制,阐明了固相因素和液相因素的强弱变化引起声速增大或减小的理论原因,分析了各种声速经验公式在海底珊瑚砂声速估算上的精度差异,得出了有必要建立包括海底珊瑚砂在内的单一类型声速经验公式的初步结论。

Through statistical analyzing the scientific investigate acoustic-physical data of the submarine coral sand in southern South China Sea, the paper shows that the analysis result of the compression wave velocity decrease with the porosity or water content increasing, and the compression wave velocity increase with the grain medium diame- ter or wet density increasing. On the basis of Blot＇s sound velocity formula and Wyllie＇s acoustic model about loose and saturation porosity water sediment, the paper explain the influence mechanism of physical-mechanical factors for the compression wave velocity of submarine coral sand, expound the cause of the sound velocity increase or decrease with the factor change of solid phase and liquid phase, analyze the precision difference of estimating submafine coral sand sound velocity of the several empirical formulas, and obtain the preliminary conclusions of needing to establishes the sound velocity empirical formulas fit for submarine coral sand and other single type seafloor sediment.