期刊
BRAZILIAN JOURNAL OF OCEANOGRAPHY
卷 57, 期 2, 页码 123-135出版社
INST OCEANOGRAFICO, UNIV SAO PAULO
DOI: 10.1590/S1679-87592009000200005
关键词
Suspended sediment transport; Salt transport; Estuarine hydrodynamics; Camboriu estuary
资金
- Balneario Cambori municipality
- CNPq fellowships [ES: 308303/2006-7, CAFS: 306217/2007-4, AHFK: 307267/2006-7, EETJr: 300123/1995-7]
Estuarine hydrodynamics is a key factor in the definition of the filtering capacity of an estuary and results from the interaction of the processes that control the inlet morphodynamics and those that are acting in the mixing of the water in the estuary. The hydrodynamics and suspended sediment transport in the Cambori estuary were assessed by two field campaigns conducted in 1998 that covered both neap and spring tide conditions. The period measured represents the estuarine hydrodynamics and sediment transport prior to the construction of the jetty in 2003 and provides important background information for the Cambori estuary. Each field campaign covered two complete tidal cycles with hourly measurements of currents, salinity, suspended sediment concentration and water level. Results show that the Cambori estuary is partially mixed with the vertical structure varying as a function of the tidal range and tidal phase. The dynamic estuarine structure can be balanced between the stabilizing effects generated by the vertical density gradient, which produces buoyancy and stratification flows, and the turbulent effects generated by the vertical velocity gradient that generates vertical mixing. The main sediment source for the water column are the bottom sediments, periodically resuspended by the tidal currents. The advective salt and suspended sediment transport was different between neap and spring tides, being more complex at spring tide. The river discharge term was important under both tidal conditions. The tidal correlation term was also important, being dominant in the suspended sediment transport during the spring tide. The gravitational circulation and Stokes drift played a secondary role in the estuarine transport processes.
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