Tidal Flooding Assessment in Balikpapan Coastline using Modified Coastal Vulnerability Index (CVI) Nabila Luthfiani (a), Muhammad Aldila Syariz (b*)
Institut Teknologi Sepuluh Nopember (ITS), Surabaya 60111, Indonesia
*aldilasyariz[at]its.ac.id
Abstract
Coastal zones are foundational in supporting economic and ecological activities, yet are increasingly exposed to tidal flooding due to sea-level rise and climate variability. Indonesia, as the world^s largest archipelagic nation, faces heightened risk with extensive low-lying coastlines and rapid urban development. Balikpapan, a coastal city in East Kalimantan and a strategic node near the new national capital, experiences frequent tidal inundation events that threaten industrial infrastructure, fisheries, and coastal tourism. This study aims to assess the physical vulnerability of Balikpapan^s coast to tidal flooding by applying a modified Coastal Vulnerability Index (CVI) using remote sensing and geospatial data. Landsat 8 imagery, Sentinel 2A and secondary datasets were used to extract seven key parameters: geomorphology, shoreline change rate, coastal slope, significant wave height, relative sea-level rise, mean tidal range, and mangrove width. Each parameter was ranked and integrated within a GIS-based CVI framework to produce spatial vulnerability map at sub-district level. The result shows that
21.43% of sub-districts are not vulnerable, 28.58% exhibit low to moderate vulnerability, 35.71% are classified as vulnerable, and 14.29% as highly vulnerable. The findings can inform local authorities and stakeholders in prioritizing mitigation efforts and developing sustainable coastal management strategies for Balikpapan and similar regions across Asia.
