Grain size characteristics of surface sediment and its response to the dynamic sedimentary environment in Qiantang Estuary,China

• 作者: Shanshan Wang Cunhong Pan Dongfeng Xie Mingwei Xu Yuhan Yan Xinwen Li
• 来源期刊: 国际泥沙研究（英文版）
• 年，卷（期）: 2022,（4）
• 页码范围: 457-468
• 页数: 12页
• 语种: 英文

摘要

The composition and grain size characteristics of sediment in estuarine and coastal environments pro-vide important information on the material source,hydrodynamic environment,environmental events,etc.However,few studies have focused on the sediment characteristics of the entire Qiantang Estuary,particularly,on the correlation between hydrodynamics and sediment properties.Through systematic sampling of the surface sediment in a large area of the Qiantang Estuary,the spatial distribution char-acteristics of the surface sediment of the Qiantang Estuary,such as the grain size composition and particle size parameters,in different sections of the estuary area are analyzed.By comparing the particle size data of different estuaries,the similarities and differences of the particle size parameters of the Qiantang Estuary and other estuaries are compared and analyzed.According to the differences in the sediment composition,the distribution status of the particle size frequency curves and the morpho-logical characteristics of the probability curves in the entire study area,the Qiantang Estuary is divided into 7 dynamic depositional areas:Fuchunjiang Hydropower Station-Fuyang,Fuyang-Qibao,Qibao-Cao'e River,Cao'e River-Zhapu,North Shore of Hangzhou Bay,middle part of Hangzhou Bay,and South Shore of Hangzhou Bay,which are different from the previous estuary segmentation system.The study area is divided into 13 dynamic depositional sub-regions using the Pejrup M triangle diagram.Combining the calculation results of the mathematical model and the Pejrup M triangle diagram,the relation be-tween the dynamic deposition environment and the bottom shear stress is discussed.It is found that the spatial distribution of the bottom shear stress in the study area is in good agreement with the zoning of the dynamic sedimentary environment.