Fluid Mud Measurement and Siltation Analysis in A Trial Excavated Channel in the Approach Channel of the Xiangshan Port  

作　　者：DING Jian HU Guo-dong WANG Zhen-xiang SHI Jian WU De-an 

机构地区：[1]Key Laboratory of Coastal Disasters and Defence,Ministry of Education,Hohai University,Nanjing 210098,China [2]Yangtze River Estuary Investigation Bureau of Hydrology and Water Resource,Shanghai 200136,China

出　　处：《China Ocean Engineering》2020年第3期421-431,共11页中国海洋工程（英文版）

基　　金：the National Natural Science Foundation of China(Grant No.41776024);the National Key R&D Program of China(Grant No.2017YFC0405400).

摘　　要：In order to clarify the distribution and variation of silt and fluid mud in the Waiganmen shallow section of the 50000-ton intake channel of the Xiangshan Port,and to understand the influence of the channel excavation on the surrounding flow conditions and the strength of the backsilting,especially the impact of typhoon on the sudden silting of the channel,so as to demonstrate the feasibility and stability of the channel excavation.The fluid mud,hydraulic,sediment and topographic measurements were carried out in the study area,and the thickness of the fluid mud layers,tidal current,sediment and topographic data were obtained.Dual-frequency sounder,gamma-ray densitometer and SILAS navigational fluid mud measurement system were used to monitor the fluid mud,and the results were compared and verified.The adaptability and accuracy of the three methods were analyzed.The SILAS navigational continuous density measurement system and gamma-ray fixed-point fluid mud measurement are used to detect the density,thickness and variation of the fluid mud accurately.Based on the hydrological observation data,the process of erosion and deposition in excavation channel and its influence mechanism are analyzed,and the distribution characteristics and evolution law of siltation in engineering area are given in the form of empirical formula.The research shows that the super typhoon can produce large siltation,which results in sudden siltation of the channel.The tidal current is the main dynamic factor of the change of erosion and siltation of the excavation trench.Under the influence of reciprocating tidal current and excavation topography,the trial excavation trench is silted on the whole.There is fluid mud in the monitoring area of the trench,and the distribution of fluid mud is different in space.The thickness of the fluid mud at the bottom of the trench is generally larger than that outside the trench and the slope of the trench,and the siltation of the trench tends to be slow.The research results can provide scientific evaluation

关 键 词：excavation trench fluid mud backsilting MEASUREMENT tidal current dynamic mechanism 

分 类 号：U653.1[交通运输工程—港口、海岸及近海工程]