Geospatial modelling of coastal exposure index along the Madura Strait

The Madura Strait region is an area with high community activity and population density within East Java Province. This region is also known as the estuary of several major rivers, resulting in a relatively well-preserved mangrove ecosystem.This study aims to evaluate the impact of the mangrove ecosystem in the Madura Strait using the Integrated Valuation of Ecosystem Services and Tradeoffs (InVEST) software. The analysis focused on the Coastal Exposure Index (CEI) under the scenarios with the prcenses od mangrove as habitats. The CEI results categorized the coastline into four vulnerability classes: Low, Moderate, High, and Critical. The results of this study indicate that the CEI categories in the Madura Strait primarily fall under the Low category, covering 324.51 km (48.98% of the total coastline length). The Critical and High categories span 117.97 km and 30.71 km, respectively, accounting for 17.81% and 4.64%. The regions with the highest vulnerability are Sidoarjo, Surabaya, Pamekasan, and Sampang. The primary factors influencing vulnerability in these areas are wave exposure and the elevation of the region. It is also noted that mangrove ecosystems play a significant role, with coastlines that have dense mangrove cover exhibiting relatively lower vulnerability levels.