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Monitoramento da linha de costa

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Repositório Institucional da UFSC
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Abstract

Abstract : The present research shows the analysis of the different methods to monitoring the coastal geomorphology and avaliable the shoreline indicators applied in temporal event scale studies. The experiments were made in two different morphodynamic beach type, one intermediate and the other one reflective. A comparative test between the DGPS and GPS-RTK were made to mark the position of the shoreline. Also were compared the use of the GPS-RTK and Geometric Leveling aimed to obtain Beach Profiles. The results shows that the DGPS method can be used in planimetric researches as long as the post processing data is made and the altimetric data are discarded. The method GPS-RTK shows results as good as geometric leveling for the representation of the beach profile, with volumetric differences between 0,1% and 6,4%. The results shows that the GPS-RTK method have enough precision to obtain beach profile data, including altimetric data. The analysis of the shoreline indicators show that the wet dry line and the runup maximum had the biggest mobility, with variations around 30 meters. The most stable shoreline indicator analyzed to represent the erosive process is the scarp base. To monitoring coastal morphologic evolution at a event scale were used GPS-RTK to obtain the position of the shoreline indicator in a scarp base. Erosive processes were verified at Camping da Barra beach. The results shows volumetric accretion between 8 m3/m and 17 m3/m in disparate profiles. While was verified movement of the scarp base in landward with 0,3m during this study in Camping da Barra beach. At Taquarinhas Beach the shore line variation increased a medium rate of 0,1m and a volumetric variation between 11m3/m and 25m3/m. Was not possible to verified the morphodynamic changes related to different events because the sample of the morphological data were observed with inappropriate interval.

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