TEMPORAL SHORELINE SERIES ANALYSIS USING GNSS

FRANCISCO JAIME BEZERRA MENDONÇA, RODRIGO MIKOSZ GONÇALVES, JOSEPH AWANGE, LUCIANA MARIA DA SILVA, MARIA DAS NEVES GREGÓRIO

Resumo


In recent decades, Boa Viagem beach located in the city of Recife-PE and Piedade
in Jaboatão dos Guararapes-PE (Brazil) has seen urbanization near the coastline
causing changes in social, economic and morphological aspects, where coastal
erosion problems are observed. This study uses GNSS (global navigation satellite
system) shoreline monitoring approach, which is quicker, and provides continuously
updatable data at cm-level accuracy to analyze and determine temporal positional
shifts of the shoreline as well as annual average rates through EPR (end point rate).
To achieve this, kinematic GNSS survey data for the years 2007, 2009, 2010 and
2012 were used. The results show sectorial trends over the years, with the highest
annual retreat rate of 8.16 m /year occurring during the period 2007-2009. Variety
of differents patterns over the shoreline was also observed. These findings could be
essential for decision making in coastal environments.

Palavras-chave


Shoreline; Monitoring; GNSS; Coastal Erosion; Coastal Settlement

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Boletim de Ciências Geodésicas. ISSN: 1982-2170