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对大连湾、大窑湾外及其附近海域表层沉积物进行了粒度分析,揭示了该区域大致的沉积特征。结合相关的地质水文资料,探讨了其控制因素,同时对沉积环境进行了初步分析。研究区沉积物粒度组分以砂(平均含量34%)和粉砂(平均含量52%)为主,粘土含量比较少(平均含量14%),且主要分布在研究区中部水下台地之上,各组分相对含量呈东西向条带状分布,与地形分布趋势较为一致。北部近岸水下岸坡区,水深较浅,距离物源区较近且水动力条件复杂,沉积物粒度较粗;向南随水深增加水动力减弱,东部为一水下台地,沉积物粒径偏细。分选较好,粉砂和粘土组分在该区域最为富集,沉积物可能来自于通过东部海域自西向东进入研究区的远源物质;研究区南部水深增加,又出现一水下岸坡,其下地形趋于平坦,该区域在黄海环流体系的作用下,接受了较多来自包括山东半岛水下三角洲的粗颗粒物质。
The grain size analysis of surface sediments in the area outside Dalian Bay and Dayao Bay and its vicinity revealed the general sedimentary characteristics of the area. Combined with the related hydrological data, the controlling factors are discussed, and the sedimentary environment is also analyzed. The sediment particle size of the study area is dominated by sand (average content 34%) and silt (average content 52%), with relatively low clay content (average content 14%) and mainly distributed above the underwater platform in the central part of the study area , The relative content of each component is east-west strip distribution, consistent with the topographic distribution trends. In the northern coastal bank, the water depth is shallower, the distance from the provenance area is relatively close, the hydrodynamic conditions are complex, and the grain size of the sediment is coarse. The southward hydrodynamics weakens as the water depth increases, and the east is a water platform. Fine diameter. The silt and clay components are the most abundant in this area, and the sediments may come from the remote source materials that enter the study area from west to east through the eastern sea area. The water depth in the southern part of the study area increases, , The lower terrain tends to be flat. Under the influence of the Yellow Sea circulation system, the area has received more coarse particulate matter from the underwater delta including the Shandong Peninsula.