生物碎屑砂运动特性研究进展

Advances in the characterization of bioclastic sediment motion

生物碎屑砂是海洋沉积物的重要组成部分,运动特性是研究其沉积过程的关键。从生物碎屑砂的特性出发,归纳出形状和内孔隙这2个对泥沙运动产生影响的主要特性。分别从沉降、起动和岸滩演变的实验研究出发,剖析了生物碎屑砂特性对泥沙运动特性产生的影响。现有研究只探究了形状对单颗粒生物碎屑砂运动的影响,缺乏对群颗粒运动的探讨。受限于研究手段,缺少讨论内孔隙特性对生物碎屑砂运动产生的影响。未来应结合海洋水动力条件,综合考虑生物碎屑砂形状和内孔隙特性,开展生物碎屑砂运动特性研究,量化生物碎屑砂特性产生的影响,将成果运用于实际,预测生物碎屑沉积环境中的岸滩地貌演变。

Bioclastic sediments are an important part of marine sediments,and the motion characteristics are the key to study their depositional process.From the characteristics of bioclastic sediments,we summarize the two main characteristics of shape and internal pore space that affect sediment motion.From the experimental studies of settlement,inception and bank evolution,the influence of bioclastic sand properties on sediment motion characteristics was analyzed.Existing studies have only explored the effect of shape on the motion of single-particle bioclastic sediments and lacked the exploration of the motion of clusters of particles.Due to the limitation of the research tools,the influence of internal pore properties on the motion of bioclastic sediments was not discussed.In the future,we should take into account the shape of bioclastic sediments and internal porosity characteristics in the context of oceanic hydrodynamic conditions to characterize the motion of bioclastic sediments,to quantify the influence of the characteristics of bioclastic sediments,and to apply the results to the practical application in order to predict the evolution of the geomorphology of the shore and beach in the environment of bioclastic sedimentation.