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Physical Oceanographic Measurements to Support the Outfall System Design in the North of Santa Catarina Island, Brazil

Author(s): R. C. Barletta; P. Ribeiro; A. V. Falkenberg; M. O. A. Maranhão; L. Franklin; L. Benedet; P. G. De Lara; A. B. Trevisan; V. Dos Santos; T. Bleninger

Linked Author(s): Tobias Bleninger

Keywords: Diagnostics of oceanography; Measurements; Waves; Tides; Currents; Water masses; Support for decision making

Abstract: Santa Catarina Island is located in Southern Brazil and is one of the major touristic spots of Brazil due to its beautiful beaches and scenic landscapes. Considering population growth and population variability along the seasons of the year, it’s a challenge for the sanitation system provided by the local government. To address physical oceanographic conditions that surround the island to support decision making concerning outfall system design, CB&I realized field data measurements of waves, tides, currents and water properties. Results showed wave regime characterized by an energetic swell from S/SE, a swell from East and a windsea from NE at the oceanic beach of Moçambique. Canasvieiras, located inside the northern bay of Florianopolis, receives energy from waves coming from N/NE. For the beach of Ingleses the waves comes mainly from SE due to the geomorphology that protects this bay beach from NE and S waves. Tides are semi-diurnal with diurnal variations, micro tide system of the order of 1 m. Meteorological tide plays an important role to sea-level variations. For Canasvierias, the astronomical tide was the main force governing water currents along the W-E axis. The inner shelf currents at Moçambique are ruled by wind and tides. The geomorphology at Ingleses drives a resultant flow from SW to NE and reversals from NW to SE with warmer water when the flux comes from inside the Bay of Florianopolis. Data measured by CTD showed upwelling of the ACAS (South Atlantic Central Water Mass) at the more oceanic measurement spots that occurred few times along all the measurement period, mainly at summer season.

DOI:

Year: 2016

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