Gis and Remote Sensing Techniques for the Investigation of Coastal Dynamics: the Grado Island Case
Andrea Favretto (1), Giovanni Mauro (2), Luciano Lago (1)
(1) University of Trieste - Dept. of Geographical and Historical
Sciences (IT)
(2) CETA, Gorizia (IT)
In this paper we have tried to outline the evolution
of the coastline of the island and the lagoon of Grado on the northern Adriatic
sea.
Grado island and its lagoon are very significant both from a tourist and from
an environmental point of view. During the last century many different human
actions have been carried out here, which caused some considerable erosion
and sedimentation problems along the waterfront.
We used maps dating back to 1830, 1949, 1988 in raster and vector format;
one satellite image (sensor Aster, Terra satellite) of 2001. To these data
we applied GIS techniques (rectification and overlaying of the different layers),
together with remote sensing methods (rectification and classification). In
this way we reached the following results:
- Identification of the main coastline changes from 1830 till now.
- Quantification (in square Km) of the lagoon areas that have been drained away by the human action.