山东半岛北部近岸海区表层沉积物物源与沉积环境

发布时间：2018-04-27 07:04

本文选题：山东半岛北部近岸海区 + 沉积动力环境　；参考：《中国海洋大学》2014年硕士论文

【摘要】：本文以山东半岛北部近岸海区为研究区域，对表层沉积物进行了粒度、黏土矿物及重金属元素特征研究，，讨论了研究区现代沉积动力环境、沉积物物源、沉积环境以及重金属污染状况，着重对沉积环境和沉积物物源进行了研究。查明了山东半岛北部近岸海区表层沉积物分布特征。黏土质粉砂分布最为广泛，约占研究区面积的60%以上；砂质粉砂主要集中在山东半岛东部近岸局部区域；粉砂质砂主要集中在东北部和成山头南部局部区域。研究区可划分为A、B、C、D四个区。A区和C区内沉积物主要集中Pejrup分类图的C类和Ⅳ类区内，表示水动力相对较弱，颗粒物以递变悬浮组分为主；B区和D区内沉积物主要集中在Pejrup图的C、D类和Ⅲ类区内，说明介质扰动程度低，颗粒物以均匀悬浮组分为主。运用Gao-Collins法进行粒径趋势分析的结果表明，当Der≥0.2时，能较好地反映出沉积物的净输运趋势。采用高密度采样（采样网格间距约为8×5km）揭示了沿岸侵蚀区和沿岸流沉积区，研究区沉积动力具有较好的分带性，可分为沿岸砂质区和沿岸泥质沉积区。砂质区为侵蚀区或强动力区，潮流和波浪强；泥质区水动力环境相对较弱，为黄海沿岸流控制区域。近岸局部区域受地形影响，形成环流区，造成沉积物颗粒变细。伊利含是研究区内的优势黏土矿物，其含量比长江和黄河中的低；蒙脱石在研究区含量分布不均匀，明显高于黄河和长江物质；高岭石含量与黄河和长江物质非常接近；绿泥石含量明显低于黄河和长江的物质。分析结果表明，研究区的沉积物主要来自于黄河。使用地质累计指数法、富集因子法和潜在生态危害指数法对海底表层沉积物进行了重金属环境评价，结果表明研究区重金属含量属于清洁水平，生态危害程度低。
[Abstract]:In this paper, the grain size, clay minerals and heavy metal elements of the surface sediments are studied in the near shore area of the northern Shandong peninsula. The modern sedimentary dynamic environment, the source of sediment, the sedimentary environment and the pollution of heavy metals in the study area are discussed, and the environment of sedimentation and the source of sediment are studied.
The distribution characteristics of surface sediments in the northern coastal area of Shandong Peninsula are found out. The distribution of clay silt is most extensive, accounting for more than 60% of the area of the study area; sand silt is mainly concentrated in the local area of the east coast of Shandong Peninsula; silty sand is mainly concentrated in the northeast and the southern part of the south of Chengshan.
The study area can be divided into A, B, C, and D four regions,.A region and C area, which mainly concentrate in the C and class IV regions of Pejrup taxonomy, indicating that the hydrodynamic forces are relatively weak and the particles are mainly in the variable suspension components, and the sediments in B and D areas are mainly concentrated in C in the Pejrup map and in class III regions, indicating that the degree of medium disturbance is low and the particles are suspended evenly. The results of particle size trend analysis using the Gao-Collins method show that when Der is greater than 0.2, the net transport trend of sediments can be better reflected.
The coastal erosion area and coastal flow depositional area are revealed by high density sampling (sampling grid spacing of about 8 x 5km). The sedimentary dynamic of the study area has good zonation, which can be divided into coastal sandy area and coastal argillaceous area. The sandy area is an eroded area or strong dynamic zone, and the tidal wave and wave wave are strong. The hydrodynamic environment of the muddy area is relatively weak, which is the Yellow Sea. The coastal area is controlled by the topography, which results in the formation of the circulation area, resulting in finer sediment particles.
Yili is the dominant clay mineral in the study area, its content is lower than that in the Yangtze River and the Yellow River; the content distribution of montmorillonite in the study area is uneven, obviously higher than that in the Yellow River and the Yangtze River; the content of kaolinite is very close to the substance in the Yellow River and the Yangtze River; the content of the chlorite is obviously lower than that of the the Yellow River and the Yangtze River. The sediments are mainly from the Yellow River.
The heavy metal environment was evaluated by the accumulation factor method, the enrichment factor method and the potential ecological hazard index method. The results showed that the heavy metal content in the study area belonged to the clean level and the ecological harm was low.

【学位授予单位】：中国海洋大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：P736.2

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