Grain size characteristics of surface sediments in the northern waters of Zhifu District, Yantai and their indications of the sedimentary dynamical environment

In this paper, the grain size composition, grain size parameters, sediment types and transport trend of 80 surface sediment samples from the northern area of Zhifu District, Yantai were analyzed. The results show that there are two types of sediment in the study area, namely, silty sand and sandy silty sand. The grain size is mainly composed of sand, silt and clay, in which silt occupies the dominant position. The average particle size of the sediment ranges from 3.46Φ to 6.10Φ. In the study area, the sediment in the southeast of the study area has coarser particle size, poor sorting, positive bias, and sharp peak state, and the sediment in the northwest is fine, poor sorting, positive bias, and sharper peak state. Based on multivariate grain size statistics and transport trend analysis, the study area is divided into A region (far shore sediment area) and B region (near shore sediment area) : The main sediment type in A region is silty sand, and the main sediment type in B region is sandy silt. Both areas are affected by coastal current of Shandong Peninsula and residual current of Yellow Sea warm current, and the main material source in the region is the Yellow River sediment.