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Characteristics and generation mechanism of turbidity maximum in the Changjiang Estuary

Acta Oceanologica Sinica 2000年第1期19卷 47-57页

作者： Pan Ding’an Shen Huanting Mao Zhichang and Liu Xincheng (1. State Key Lab of Estuarine and Coastal Research, East China Normal University, Shanghai 200062, China) State Key Lab. Estuarine Coast. Res. East China Normal University Shanghai 200062 China

Sediment convergence and resuspension are the two major mechanisms in forming turbidity maximum (TM) in the Changjiang Estuary. Sediment convergence is mainly controlled by the interaction between runoff and tidal current, the mixing of freshwater and salt water, the former forming tidal TM, whereas the latter forming brackish TM. The TM in the Changjiang Estuary is characterized by a combination of tidal TM and brackish TM, which varies temporally and spatially.

关键词： Changjiang Estuary turbidity maximum sediment convergence resuspension

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SEDIMENT TRANSPORT IN YALU RIVER ESTUARY

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Chinese Geographical Science 2003年第2期13卷 157-163页

作者： GAOJian-hua GAOShu CHENGYan DONGLi-xian ZHANGJing MinistryofEducationKeyLaboratoryforCoastandlslandDevelopment NanjingUniversityNanjing210093P.R.China DepartmentofEnvironmentandEcology DandongNormalSchoolDandong118003P.R.China SecondInstituteofOceanography StateOceanicAdministrationHangzhou310012P.R.China CollegeofChemistryandChemicalEngineering OceanUniversityofQingdaoQingdao266003P.R.China

Tidal cycle measurements of tidal currents, salinity and water tempe rature, and suspended sediment concentrations were measured at four stations, to gether with surveys along two profiles short core collection within the Yalu Riv er estuary. Grain size analysis of the three core sediment showed that: 1) the s ediment from B1 to B3 became finer, worse sorting and positively skewed; 2) the diversification of matter origin became more and more evident from east to west; 3) the sediments over the region were of the same origin, as indicated by their similar colors and grain sizes. The data indicated that stratification occurred in the flood season, from upstream to downstream, and a salt wedge was formed. The water column was well mixed, but the longitudinal gradient of the salinity w as larger on spring tide. The results also showed that the dominating mechanism of suspended sediment transport in the Yalu River estuary was T1, T2, T3 and T5. The non-tidal steady advection transport was restricted by the net transport o f suspended sediment induced by mass Stoked drift directed to landwards, then th e net sediment transport rate were decreased and the turbidity maxima was also f avored to forming and extending.

关键词： grain size suspended sediment transport turbidity maximum the YaluRiver estuary

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Journal of Geographical Sciences 2002年第4期12卷 489-494页

作者： LI Yuzhong, CHEN Shenliang(State Key Laboratory of Estuarine && Coastal Research, East China Normal University, Shanghai 200062, China) State Key Laboratory of Estuarine & Coastal Research East China Normal UniversityShanghai 200062 China

By analysis of published papers on the Yangtze estuary and hydrological and sediments data in Yangshan Harbor area, many similarities are found between Yangshan Harbor area and the Yangtze estuary. These similarities include the phenomenon of stagnating flow areas, the distributive characteristics of the highest suspended sediment concentration areas, superficial sediments and shoal bars. The stagnating flow area is the major similarity which causes other similarities. These similarities indicate that: 1) turbidity maximum and mouth bars in estuaries are mainly caused by the hydraulic balance of stagnating flow areas of estuaries; 2) The stagnating sand area of sands caused by stagnating flow area often locates on the narrower side of the stagnating flow area; 3) The location (or shape) of fine sediments area caused by stagnating flow area reflects the location (or shape) of the stagnating flow area. Both Yangshan Harbor area and the Yangtze estuary are the important developmental areas in the future (man-made similarity). In-depth studies on these similarities between Yangshan Harbor area and the Yangtze estuary will have momentous theoretical and practical significance.

关键词： Yangshan Harbor Yangtze estuary similarity stagnating flow area turbidity maximum mouth bar

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