日照市海岸带海滩沉积物粒度特征及物源分析

Analysis of Grain Size Characteristics and Sediment Source on the Rizhao Coastal Zone Beach

摘要:

根据日照市海岸带2个重点海滩所采集的样品，通过粒度、磁化率、主微量及稀土元素等方面的调查资料，综合分析了研究区沉积物类型、分布特征、搬运路径及物质来源。结果表明，研究区沉积物类型以砂为主，在平行海岸方向上，沉积物粒径自北至南由细变粗。在垂直海岸方向上，从滩肩到滩面再到低潮线处，沉积物粒径逐渐变细。海滨国家森林公园海滩的分选性要好于万平口海水浴场海滩。沉积物受黄海沿岸流影响，多自北向南运移。海滩中浅部物质的来源与陆内一侧基岩中斜长片麻岩和二长花岗岩的关系较为密切，深部物质的来源与靠海一侧基岩中花岗斑岩和花岗闪长岩的关系较为密切。

Abstract:

According to samples collected from two key beaches along the coast of Rizhao city. From the survey data of particle size, magnetization rate, main trace amount and rare earth element, the sediment type, distribution characteristics, transporting way and material source in the study area were analyzed. The results show that, the type of sediment in the study area is mainly sand. In parallel seacoast direction, the particle size of the sediments is thickened from north to south. In vertical seacoast direction, from the beach shoulder to the beach surface to the low tide line, the particle size of the sediment gradually becomes thinner. In the area of sediment sorting, the beach at Seashore National Forest Park is better than the beach at Wanpingkou. Sediments are affected by the flow along the Yellow Sea coast, moving from north to south. The source of shallow matter in the sandy beach is closely related to the plagioclase gneiss and monzonitic granite in the bedrock on the inland side. The source of the deep material of the beach is closely related to the granite porphyry and granodiorite in the bedrock on the sea side.