Guilherme Vieira da Silva

, 0000. Shoreline change analyses and insight into the sediment transport path along Santa Catarina Island north shore, Brazil. Journal of Coastal Research, 00(0), 000–000. Coconut Creek (Florida), ISSN 0749-0208. This paper presents a shoreline change analysis applied to identify the sediment transport path involving nine adjoining beaches, including dunes and spits, located along the microtidal eastern and northern shores of Santa Catarina Island (Brazil) and extending 50 km from Barra-Moçambique to Daniela. A data set comprised aerial images from 1957, 1978, 1998, 2002, 2007 and 2010 and the 2012 shoreline position measured with real-time kinematic GPS, topobathymetric data set and a 60-year water-level time series. The images were rectified and the shoreline position for each year was extracted. The average errors (ranging from 1 to 9.8 m) of the rectification process as well as the horizontal tide-related errors (varying from 8.3 6 2.6 m to 14.9 6 0.6 m) were calculated within a confidence level of 95%. Two complementary approaches were used: (1) general trends analysis using linear regression rate method and (2) shoreline behaviour statistically analysed by Euclidean distance and year-to-year analysis. The results indicate an anticlockwise longshore transport between a series of beaches with variable orientation and separated by headlands, including a dune overpassing from Santinho delivering ~10,000 m 3 y À1 to Ingleses, and headland bypassing leading to the development of three spits along the protected part of the study area that have possibly been nourished by subaqueous sand transport from the updrift beaches. During its development the Ponta das Canas spit grew ~7000 m 3 y À1 , controlling the sediment availability downdrift. As the spit grows it traps sediment and the downdrift area retreats; on the other hand, when the spit merges to the coast the sand spreads and the downdrift beaches prograde.

Inlet stabilization is a common practice in Brazil, as it is worldwide. In this paper we present results of
the analysis of the stabilization practices of the Camacho Inlet, located in Santa Catarina State, southern
Brazil. This inlet is maintained intermittently, in accordance with a regime designed to benefit both local
fishermen and rice farmers. Fishermen require this inlet to be open as a navigation channel during the
fishing season; rice farmers needs it closed during the irrigation period to allow the pumping of fresh
water from the Congonhas River which drains into the Camacho’s backbarrier lagoon. An additional
complication arises from the tendency of this inlet to close naturally due to infilling by dune migration.
Aerial images spanning a 65 year time period (1938e2003) were analyzed, demonstrating the variability
in the inlet’s width between 0 (closed) and 360 m. The analysis of inlet stability and user needs indicate
that an appropriate solution is the implementation of an annual inlet dredging program in the austral
autumn. This would allow for the inlet to remain open from May to September and then close naturally
for the rest of the year, providing for a backbarrier fresh water reservoir during the irrigation period