【摘要】 颗粒参数是描述海底沉积物的基本要素之一,它们深刻地影响到海底沉积物的物理力学性质和声学性质。统计分析结果表明,海底沉积物颗粒度参数中以孔隙度、干密度、中值粒径、平均粒径、颗粒形状之间的关系最为密切。孔隙度与体积干密度呈强线性相关,与平均粒径、中值粒径也呈弱线性相关。在沉积物声速与物理参数的单参数和双参数的经验公式讨论中,显示出声速分别与孔隙度和平均粒径之间具有密切相关关系。根据沉积物颗粒堆垒结构和颗粒形状、粒径大小等,可以计算沉积物的理论孔隙度,从而判定沉积物的声衰减系数。更多还原

【Abstract】 Grain size parameters are basic elements to describe seafloor sediments. They can deeply influence acoustic and physical-mechanic properties of seafloor sediments. Statistic analysis of the results in the paper indicates that several granular parameters of seafloor sediments, including porosity, dry-density, medium diameter, mean particle diameter and particle shape, have the most close relationships. Porosity has a stronger linear relation with dry-density and a weaker linear relation with mean particle diameter and medium diameter. There is a close relationship between acoustic velocity and porosity/grain medium diameter in one-parameter and two-parameter experiential formulas about sediment acoustic velocity and physical parameters. Based on particle piling structure, particle shape and grain size, the theoretical sedimentary porosity can be calculated and the acoustic attenuation coefficient can be determined.更多还原