Monitoramento dos processos sedimentares nas desembocaduras de um sistema costeiro sub-tropical

The use of geotechnologies has assisted in the environmental monitoring enabling the survey of the main impacts and helping in the adoption of mitigating measures. The current study were monitored sedimentary processes at the mouths of the Cananéia-Ilha Comprida-Iguape Coastal System. Landsat TM-5 satellite images from the years 1987, 1991, 1993, 1997, 2005 and 2010 were used. The images were digitally processed in SPRING. A separation of land and water was carried out on satellite images, from the mouths of the Ribeira de Iguape River and the Icapara mouth, in order to delimit the coastlines. They were compared multitemporally in order to analyze spatio-temporal evolution. For each year non-linear edge detection filter Sobel was applied. The mouths of the study areas presented intense sedimentary dynamics during the analyzed period. Bathymetric surveys conducted in the study area indicated greater depths located in the stretches where the channels are narrower and in meander areas of the lagoon channels, confirming the importance of these data for the understanding of the erosive processes in the region. The monitoring of the mouths of coastal systems should be considered as a necessary measure because they are extremely dynamic areas in terms of sedimentary processes often subjected to inadequate human occupation. From the present study, it is suggested the application of the filter for edge detection in the processing of satellite images to monitor the dynamics of the mouths of coastal systems by managers of Conservation Units and other actors involved in the management of the Brazilian coast.