A study of the circulation in Bay of Ilha Grande and Bay of Sepetiba: part II: an assessment to the tidally and wind-driven circulation using a finite element numerical model

Abstract

SynopsisA finite eZement3 tuJo-dimensionaZ hydrodynamicaZ numericaZ modeZ deveZopedby Wang & White (1976) was appUed to study the tidaZ and wind-driven C1-rcuZations in the coastaZ domain fOY'lTled by Bay of IZha Grande and Bay of Sepetiba. The tidaZ circu-Zation was modeZed by imposing a co-osciZZating tidaZ signaZ at the open boundaries of the domain. The ampUtude and phase of the tidaZ const,rb:<mts adopted to run the numericaZ experiment were based on haY'lTlonic anaZysis of previous investigations in the region3 p Zus data obtained from two tide gauges instaZ Zed near the open boundaries of the modeZed domain . The numeY'icaZ simuZation of the wind-driven circu-Zation was based on wind data statistics coveY'ing 16 months of . data. The effect of the wind in the ZocaZ circuZation was weighted by the frequency distribution of wind directions as weZZ as the associatedmostprobabZe wind forces. The numericaZ modeZ was aZso used to simuZate seiche osciUations in the coupZed system fOY'lTled by Bay of IZha Grande and Bay of Sepetiba. The modeZ resuZts are in agreement with the resuZts deY'ived in Part I of this paper3 where fieZd data was anaZysed and discussed.

Behavioral event occurrence differs between behavioral states in Sotalia guianensis (Cetarctiodactyla: Delphinidae) dolphins: a multivariate approach

“…Ilha Grande Bay (23°8'26"S, 44°14'50"W) is a large estuarine system on the southern coast of Rio de Janeiro, southeastern Brazil (SIGNORINI 1980). Marine habitats of this bay act as transition areas between the land and the sea by receiving organic matter from river drainage and mangrove production (NOGARA 2000).…”

Coordinated feeding behavior of the Guiana dolphin, Sotalia guianensis (Cetacea: Delphinidae), in southeastern Brazil: a comparison between populations

“…During this time, wall formation and perpendicular feeding were the most frequently observed tactics. Bay waters are strongly influenced by the SACW during the summer, which provides a great abundance of fish (SIGNORINI 1980). Thus, it is necessary to perform more coordinated tactics to catch prey in large schools, such as Cupleidae and Engraulidae, during this period (MATSUURA 1978).…”

“…1) (SIGNORINI 1980, ARAÚJO et al 1998. The Ilha Grande Bay receives deep waters rich in nutrients, derived from the South Atlantic Central Waters (SACW) (SIGNORINI 1980), and organic matter from river drainage and mangrove production, which act as a transition area between the sea and the land (NOGARA 2000). We surveyed the western area, which includes shallow waters (р 10 m), using boats.…”

Parental care behavior in the Guiana dolphin, Sotalia guianensis (Cetacea: Delphinidae), in Ilha Grande Bay, southeastern Brazil

“…Together with Sepetiba Bay, it forms an extensive estuarine system (SIGNORINI 1980). The western part of the bay, where boat trips were conducted as part of this study (23°02'S, 44°26'W), is relatively shallow (<10 m) (NOGARA 2000) and receives organic matter from river drainages and from biomass produced by mangroves (SIGNORINI 1980). This bay receives nutrient-rich sea waters derived from the South Atlantic Central Waters (SACW) (SIGNORINI 1980).…”

“…The western part of the bay, where boat trips were conducted as part of this study (23°02'S, 44°26'W), is relatively shallow (<10 m) (NOGARA 2000) and receives organic matter from river drainages and from biomass produced by mangroves (SIGNORINI 1980). This bay receives nutrient-rich sea waters derived from the South Atlantic Central Waters (SACW) (SIGNORINI 1980). The western part is preferentially used by S. guianensis (LODI 2003a) and is surrounded by an outer region ranging in depth between 20 and 40 m (Nautical chart #1633,), with a smaller proportion of islands and rocky coasts than the inner region.…”