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All Journal COJ (Coastal and Ocean Journal) Jurnal Teknologi dan Rekayasa Sumber Daya Air Journal of Climate Change Society
Djuraini, Moh. Fahry
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Agriculture, Biological Sciences & Forestry Humanities Astronomy Biochemistry, Genetics & Molecular Biology Chemistry Earth & Planetary Sciences Electrical & Electronics Engineering Engineering Environmental Science Physics Social Sciences

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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.
Dam Construction Impacts on Flow Stability: Evidence of a Hydrological Regime Shift in the Bulango Watershed, Gorontalo Djuraini, Moh. Fahry
Jurnal Teknologi dan Rekayasa Sumber Daya Air Vol. 6 No. 2 (2026): Inpres
Publisher : Fakultas Teknik, Universitas Brawijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/ub.jtresda.2026.6.2.59

Abstract

Dam construction is known to alter downstream hydrology, yet the early construction phase remains understudied, particularly in tropical monsoon basins where short hydrological records limit attribution. This study quantifies the initial hydrological response of the Bulango River, Gorontalo, during the onset of Bulango Ulu Dam construction (2019) using daily and monthly discharge data from 2014–2024. A combined analysis employing the Modified Mann–Kendall trend test, Pettitt change-point detection, and 33 Indicators of Hydrologic Alteration (IHA) was used to distinguish gradual climatic tendencies from abrupt construction-driven disturbances. After correcting for serial correlation, no significant long-term trend was detected, indicating that the apparent decline in discharge reflects natural hydrological persistence rather than climate-driven change. In contrast, the Pettitt test revealed a statistically robust regime shift in March 2019, coinciding with major river-diversion and excavation activities. IHA results show that although seasonal timing remains largely intact, short-duration hydrologic components have become notably unstable, with significant increases in low-pulse frequency and flow reversals. Overall, the river exhibits a 72.4% degree of hydrological alteration, indicating high-level disturbance during the construction phase. These findings provide one of the first empirical demonstrations that dam construction can induce measurable hydrological alteration well before impoundment, underscoring the need for early-phase monitoring and adaptive construction practices to reduce downstream ecological risks. The pre-impoundment baseline established here serves as a critical reference for evaluating future operational impacts once the reservoir becomes fully functional.
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