Analyzing the degree of vulnerability along the coast line of the west of the Caspian Sea (Talesh to Anzali)

The shores of the Caspian Sea have different topography and land use, including lowlands associated with the mouths of rivers, bays, or seawater advances on land and relatively higher sandy and sandy beaches. There is a very low slope in the lands behind the beach. Paleontological research shows the rise and fall of the water level of the Caspian Sea in the form of figures of several tens of meters. the purpose of this research is to analyze the degree of vulnerability of 93.4 km of coastlines in three cities of Talesh, Rezvanshahr and Anzali in Gilan province. In this research, four variables were used in the form of 12 subcategories, using the hierarchical analysis method, to achieve the vulnerability index of the coastal area of ​​Talesh to Anzali cities. According to the mentioned references and the purpose of the study, the desired variables include sea level changes, land topography, geomorphology and land use. Landsat satellite images, topographic maps 1:25000 and digital model of 12.5 meters height of the research area as well as SAGA, IDRISI, ENVI, DSAS and Arc GIS software were used for analysis. The results showed that the beaches with low vulnerability belong to the areas around PareSar breakwater, as well as areas strengthened by onshore currents. Therefore, 56.2 km (60%) of the studied coast needs special attention in order to determine management approaches to protect the coast, prevent coastal erosion and strengthen and nourish the beach.