连云港近岸海域沉积物粒度空间分布特征及其分析

The spatial distribution and analysis about the grain-size of sediments in the Lianyungang nearshore sea area

连云港近岸海域沉积物的粒度在空间上具有"近岸细、远岸粗"的分布特征。为了探讨粒度的这种空间分布特征,利用端元分析模型和多变量分析方法对108个底质样品粒度特征进行了分析,结果表明,可以把连云港近岸海域沉积物划分为具有一定动力意义的3个粒级组,它们代表不同能量环境下形成的沉积物:潮流沉积、潮流-波浪混合沉积和波浪沉积,这些沉积物对应于前三角洲沉积物、动力改造沉积物以及原地海滩沉积物。

Spatial distribution characteristics of grain-size being＂fine in nearshore, but coarse in offshore＂ have been found along the Lianyungang coastal zone. For discussing this distribution, 108 samples collected from this region were analyzed with the end-member analysis model and the multivariables analysis method. Results show that the sediment along the Lianyungang coastal zone can be divided into three grain-size groups with certain dynamic significance, corresponding to the sediment of prodelta, the dynamo-reworking sediment, and the sediment of in situ deposited on sedentary beach, which deposit under different environments, i. e.,depositional environments of tidal current, wave and both of them.