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Penilaian Multi Bahaya Pesisir di Daerah Muara Sungai Randangan, Teluk Tomini, Indonesia Djuraini, Moh. Fahry
Coastal and Ocean Journal (COJ) Vol 9 No 1 (2025): COJ (Coastal and Ocean Journal)
Publisher : Pusat Kajian Sumberdaya Pesisir dan Lautan IPB

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29244/coj.v9i1.64113

Abstract

This study aims to provide a preliminary assessment of coastal hazards in the Randangan River Mouth Coastline, Tomini Bay, Indonesia, using the Coastal Hazard Wheel (CHW) framework. The assessment focuses on key parameters such as geomorphology, wave exposure, tidal range, vegetation cover, sediment balance, and storm climate across a 14.46 km coastal stretch. Results reveal high levels of vulnerability, with ecosystem disruption, gradual inundation, and coastal erosion each posing very high to high risks along 8.35 km of the coastline, particularly in sediment plains and deltaic zones with minimal vegetation. Saltwater intrusion affects nearly the entire coastline (13.91 km) at moderate risk, while flooding presents a high risk across 13.54 km, indicating the limited buffering capacity of existing natural features. Despite data limitations, the CHW approach effectively identifies and maps multi-hazard exposure, providing a valuable tool for early-stage planning. The findings underscore the need for integrated coastal zone management, including ecosystem-based interventions and improved data collection, to support long-term resilience and adaptive strategies in vulnerable coastal settings.
Understanding the Characteristics of 1996 Extreme Rainfall and Its Association with a Megalandslide in Podi Watershed, Central Sulawesi, Indonesia Djuraini, Moh. Fahry
Journal of Climate Change Society Vol. 3 No. 2 (2025)
Publisher : Universitas Negeri Padang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24036/jccs/Vol3-iss2/60

Abstract

The 1996 Podi megalandslide in Central Sulawesi, Indonesia, occurred in a remote tropical watershed with limited data, causing severe geomorphic disturbance. Using Climate Hazards Group InfraRed Precipitation with Station data (CHIRPS) and post-event Landsat 5 imagery, this study reconstructs the hydrometeorological sequence preceding the event. Rainfall extreme indices from ETCCDI were analyzed to examine intensity, duration, and temporal distribution. Results reveal that September 1996 experienced prolonged dryness (Rx5day: 65 mm; Rx1day: 35–40 mm), which likely desiccated soils and reduced root–soil cohesion in the limestone–ophiolite terrain. In early October, rainfall intensified sharply (Rx5day: 216 mm; Rx1day: 113 mm), persisting until mid-November. The temporal overlap of antecedent dryness, intense rainfall, and fragile geology indicates a compound triggering mechanism. This study highlights how rainfall extremes contributed to slope failure in tropical montane watersheds and emphasizes the need for early warning frameworks integrating satellite-based rainfall and geological susceptibility in remote data-scarce regions.