琼东南外海海底沉积物粒度组分对孔隙度、声速的影响  

Influence of the grain size on the porosity and acoustic velocity of offshore surface sediments in the Southeastern Hainan Island

作　　者：田雨杭 陈忠[1] 刘吉睿 黄蔚霞[1] 仲义[1,2] 

机构地区：[1]中国科学院南海海洋研究所,中国科学院边缘海地质重点实验室,广东广州510301 [2]中国科学院大学,北京100049 [3]北京信息科技大学,北京100192

出　　处：《热带海洋学报》2016年第3期48-54,共7页Journal of Tropical Oceanography

基　　金：国家自然基金重点项目(91128206);国家自然基金面上项目(41376057);国家科技支撑计划项目(2014BAB14B01)~~

摘　　要：海底沉积物粒度组分影响和控制着沉积物的声学特性和物理性质,具有明显的区域性特点。文章测定了琼东南外海海底沉积物的声速、孔隙度以及沉积物粒度组成,讨论了他们的相互关系。琼东南外海海底沉积物纵波波速变化范围为1455~1773m×s^(-1),由琼东南外海的东北至南部海域,可分别划分为低声速沉积物区、高声速沉积物区、低声速沉积物区和高声速沉积物区。沉积物孔隙度回归方程和声波回归方程表明,沉积物类型从砂、粉砂质砂、黏土质粉砂、砂-粉砂-黏土到粉砂质黏土变化,声速总体呈减小的趋势,孔隙度呈明显的增大趋势。Acoustic and physical properties of surficial marine sediments are mainly influenced by the grain size and show obvious regional variations.This study was conducted on the mutual relationship between the parameters of offshore sediments in the southeastern Hainan Island by measuring the sound velocity,porosity and grain size.The results exhibited that the compression wave velocity of the seafloor sediment was variable between 1455 m×s-1 and 1773 m×s^-1.From the northeast to the southwest in this study area,the wave velocity of seabed sediments decreased and four zones with different sound-velocity could be divided.The regression analyses showed that the grain size had a negative relationship with the porosity and positive relationship with the sound velocity.The finer sediments had larger porosity and lower sound velocity.

关 键 词：沉积物 粒度组分 孔隙度 声速 琼东南外海 

分 类 号：P736.211[天文地球—海洋地质] P733.23[天文地球—海洋科学]