基于Biot-Stoll模型声速反演中的参数选择——以南海南部沉积物为例  

Choice of parameters for Biot-Stoll model——based inversion of sound velocity of seafloor sediments in the southern South China Sea

作　　者：陈静[1,2] 阎贫[1] 王彦林[1] 金丹[1,2] 林秋金[1,2] 

机构地区：[1]中国科学院边缘海地质重点实验室南海海洋研究所,广东广州510301 [2]中国科学院研究生院,北京100049

出　　处：《热带海洋学报》2012年第1期50-54,共5页Journal of Tropical Oceanography

基　　金：中国科学院知识创新工程重要方向项目(KZCX2-YW-228);国家自然科学基金(U0733003;40876027;40876018);国家重点基础研究发展计划项目(2007CB411706)

摘　　要：研究海底表层沉积物性质对海洋矿产资源探测、海洋工程建设等有重要的意义。Biot-Stoll模型可以模拟预测海底沉积物的物理性质,但采用不同的参数模拟的效果不同。Stoll参数是各种海洋环境下模型达到最佳预测的单一数值的形式;Schock参数则是对渗透率、孔隙大小、沉积物孔隙曲折度等修改后的函数表达式形式,更接近沉积物实际情况。采用Stoll参数和Schock参数分别计算了南海南部海区海底沉积物纵波速度,并对南海南部沉积物样品进行了计算和实测对比,结果表明,采用Stoll参数计算误差较大,平均为3.962%;采用Schock参数计算误差较小,平均为0.847%。因此,在南海南部海区采用Schock参数预测海底表层沉积物物理性质更准确。Seafloor sediment properties are important to the survey of marine mineral resources and engineering.The Biot-Stoll model can simulate physical properties of sediment differently with distinct parameters.Stoll parameters are the statistical numbers when the Biot-stoll model gives the best forecast,while Schock parameters are some of the model parameters that need to be modified,such as porosity,pore radius,and pore tortuosity of sediments.In this study,we use the Biot-Stoll model and Stoll and Schock parameters to inversely obtain the sound wave velocity of the sediments in the southern South China Sea,and compare them with the measuring values.The results show that the velocity of fast compression wave calculated by the Biot-Stoll model with Stoll parameters has large errors comparing with that measured in laboratory,whose average is 3.962%,while the model-based predication is more consistent with the laboratory data when using the Schock parameters,whose average is 0.847%.These results suggest that it is more accurate to study the sediments in the SCS using Schock parameters.

关 键 词：Biot-Stoll模型 Stoll参数 Schock参数 南海 海底沉积物 声速 

分 类 号：P733.23[天文地球—物理海洋学]