Caracterização da circulação e balanço do material particulado em suspensão (MPS) na desembocadura da baía de Vitória/ES
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Data
2012-03-28
Autores
Garonce, Flávia Acypreste Alfredo
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Universidade Federal do Espírito Santo
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Understanding estuarine dynamics is an extremely arduous task due to the numerous variables that can influence the system, such as tide, river flow, wind, morphology, among others. However, such studies are necessary due to the large use of this environment for navigation, creation of ports, fisheries, tourism, and a range of goods and services it provides. Thus, this study aimed to contribute to the knowledge of hydrodynamics and flow properties (SPM and salt) in the mouth of the estuary of the Bay of Vitoria. For this purpose measurements were made in four tidal cycles, two in spring tides and two in the neap tides, with seasonal variations between summer (rainy season) and winter (dry season), salinity and temperature with a CTD (OBS 3A) currents with a ADCP (River Surveyor). For the analysis of SPM water samples were collected. This water samples were filtered to obtain the concentrations thereof. From our analysis, this section of the estuary was classified according to the diagram Hansen and Hattray (1966) as the type 1a in springs tide and 2b in neap tide during dry season and 2b in neap tide rainy season. This corroborates the findings using Richardson layer number where the highest values were found during the neap tide rainy, it was the cycle that showed greater stratification. Although there were variations between the dry and rainy season tides was the main forcing controlling hydrodynamic processes in the estuary. Salt and MPS, there were predominantly imported, except for the spring rainy cycle, were exported SPM. In addition, the dynamics of the suspended material showed a nonconservative behavior, with no association with the current processes although lags interfere in the transport, it may be observed due to residual tidal currents (asymmetry tide) is mainly toward the sea. Furthermore, it was realized that the tide was the most active in providing through the suspension of the bottom, and the process of tidal pumping that allowed transport into the estuary.
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Material particulado