Modelagem numérica da região costeira de Santos (SP): circulação de maré

Abstract

. Abstract: The Princeton Ocean Model (POM) was implemented for the coastal region of Santos (46°-47°W, 23°40' -24°30'S), with a regular grid ofresolution~I km and 11 sigma levels in the vertical. The model was used in tidal simulations, with the specification of the correspondent oscillations at the boundaries, computed through cotidal maps of the shelf. The model runs considering separately the lunar and solar principal components (M2 and S2), for 5 days each, and the 9 principal tidal constituents composed, for 31 days. The tidal analysis of the resulting time series allowed the obtention of maps with the cotidal lines and the axes of the surface current ellipses. These maps indicate the characteristics of the propagation of the tidal waves in the modeled area, with the spatial distributions of their elevations and currents. The most important aspects discussed in this study are: the contrast of the circulation intensities, between the deeper region and the internal shallow areas; the marked difIerences of current intensities in both sides of Santos Bay; the currents convergence / divergence in São Vicente and Bertioga Channels; tidal assimetries in the shallow regions; and the counterclockwise rotation of the currents in the coastal area. The model can be used for operational predictions of tides and tidal currents in the study area.. Resumo: Foi implementado o Princeton Ocean Model (POM) para a região costeira de Santos (46°-47°W, 23°40' -24°30'S), com grade regular de resolução~1 km e 11 níveis sigma na vertical. O modelo foi utilizado em simulações de maré, com a especificação das correspondentes oscilações nos contornos, calculadas com base em mapas cotidais da plataforma. O modelo foi processado considerando isoladamente as componentes principais lunar e solar (M2 e S2), cada qual por 5 dias, e com as 9 principais componentes de maré conjuntamente, por 31 dias. As análises de maré das séries temporais de resultados possibilitaram a composição de mapas com linhas cotidais e eixos das elipses de correntes de superficie. Esses mapas indicam as características da propagação das ondas de maré na área modelada, com as distribuições espaciais de suas elevações e correntes. Os aspectos de maior interesse no estudo realizado são: o contraste das intensidades das circulações, entre a parte mais profunda e regiões internas rasas; as marcantes diferenças de intensidade de correntes nos dois lados da Baía de Santos; a convergência / divergência das correntes nos Canais de São Vicente e de Bertioga; assimetrias de maré nas regiões rasas; e rotação anti-horária das correntes na área costeira. O modelo pode ser utilizado em previsões operacionais de marés e correntes de maré na área de estudo.

The efficiency of curved jetties in Bay of Santos – SP: numerical modeling

“…The same behavior was noticed by Sondotécnica (1977a) and Harari and Camargo (1998). However, from the scenarios 2 and 3 (Figures 14 and 15) it is noticed that the proposed jetties induced the drifters out of the bay.…”

“…The numerical modeling technique has been successfully applied in many studies to represent coastal environments (HARARI; CAMARGO, 1998;BAPTISTELLI, 2008;ROVERSI et al, 2016). The complex hydrodynamic effects which include salinity and temperature stratification would require a 3D modeling.…”

“…On the other hand, it was considered the rivers flow in the estuary, which is the second important effect to induce currents there according to Sondotécnica (1977a). Harari and Camargo (1998) and Roversi et al (2016) highlighted that reproducing tidal currents is enough to achieve good results in modeling numerically Santos Estuary, since the study target doesn't include evaluating meteorological effects.…”

Macroalgal composition and its association with local hydrodynamics in the Laje de Santos Marine State Park, southwestern Atlantic, São Paulo, Brazil

“…The LSMSP surface currents were computed with a three-dimensional hydrodynamic numerical model implemented by Harari and Camargo (1997, 1998 and Harari et al (2006) by analyzing the coastal circulation and its correlation with biological patterns. The model considers the coastal circulation forced by tides, winds and density effects.…”

Resposta morfodinâmica à alimentação artificial da Ponta da Praia, Santos, SP

“…Segundo Harari & Camargo (1998) O nível do mar pode se elevar extraordinariamente causando inundações na costa, quando tempestades severas atingem o litoral durante períodos de máxima maré astronômica (sizígia) (Campos et al, 2010). Nesse caso, a diferença entre a maré observada e a maré astronômica prevista para determinado local, quantifica a influência desse tipo de fenômeno sobre a orla continental, sendo definida como maré meteorológica (Pugh, 1987apud Campos et al, 2010.…”