【摘要】 <正> 沉积物的粒度成分是反映沉积作用、沉积环境、特别是沉积动力条件最明显的标志之一,因而,研究现代沉积物粒度成分的空间分布及其在不同沉积环境下的粒度分布特征,探讨其形成机制等,一直吸引着有关学者的注意。 近二十年来,有些学者曾据沉积物的粒度参数特征,区分了现代风砂、河沙和海滩砂更多还原

【Abstract】 The sea bottom sediments of Fangcheng Bay were investigated in 1976. In this paper, we describe the sources and distributions of sediments. The result of this study shows that distributions of the coarse sediments as a whole were along main channel area, but fine sediments were distributed over the place where the hydro-dynamic conditions were relatively stable. Thus, the distributions of sediments are regarded as functions of the hydro-dynamic characteristics. At outer zone of this bay, the sand sediments were formed in low sea level period, then reworked continuously. Therefore, the distribution mode of the sediments was veneered by different grain sizes and times of sediments in Fangcheng Bay.In addition, we describe in detail the hydro-dynamic conditions , distributions of the grain size and grain parameters according to geomorphologic patterns and distinguish them by way of analysis of variation and multiple comparison. The investigation shows that, Mz and σ are the most sensible parameters to reflect sedimentary hydro-dynamic environments.更多还原