日照近岸海域表层沉积物粒度特征及沉积环境分析

Analysis on Grain Size Characteristics and Sedimentary Environment of Surface Sediments in Rizhao Offshore Areas

摘要:

通过对山东半岛南部日照段近岸海域116个表层沉积物粒度测试，分析了该区域表层沉积物的粒度特征，探讨了其环境指示意义。结果表明，根据福克三角分类法，研究区沉积物类型以砂质粉砂为主，为日照近岸海域沉积物主要类型，粉砂质砂次之，呈条带状分布在砂质粉砂东侧，砂质泥在研究区南部呈斑块状分布，泥质砂呈零星斑状分布在研究区；砂仅在北部两城河口有一个站位，其分布与水动力条件基本吻合，受沉积物来源的影响，沉积动力环境由潮流、沿岸流以及沉积物来源共同控制影响。近岸海域沉积动力分区主要落于Pejrup三角图分区的CⅢ区和CⅣ区，随离岸距离增加，沉积动力过渡为BⅢ区，沉积动力增强，受潮流控制显著。

Abstract:

Based on grain size measurement of 116 surface sediments in Rizhao immediate offshore area in the southern Shandong Peninsula, the grain size characteristics of surface sediments in this area have been analyzed, and their environmental significance has been discussed. It is showed that main sediment types in the study area are sandy silty sand, which is the main sediment type in Rizhao immediate offshore area, followed by silty sand, which is distributed banded in the east side of sandy silty sand, sandy mud is distributed in patches in the south of the study area, and muddy sand is distributed sporadically in the study area. Sand has only one station in the northern Liangcheng estuary, and its distribution is basically consistent with hydrodynamic conditions, which is affected by the sediment sources, and the sedimentary dynamic environment is jointly controlled by the tidal current, the coastal current and the sediment sources. The sedimentary dynamics of the immediate offshore area mainly fall in the CⅢ and CⅣ zones. As the offshore distance increases, sedimentary dynamics transition to Zone B Ⅲ. Sedimentary dynamics will increase. It is significantly controlled by tidal currents.