Assessing Coastal Soil Capacity and Flood Risk in Kulon Progo Coastal Area, Indonesia
DOI:
https://doi.org/10.51264/inajl.v6i1.82Keywords:
Climate adaptation, Coastal soil, Flood risk, Kulon Progo, Land-use changeAbstract
The coastal areas of Kulon Progo, including the salt marshes, play a vital role in mitigating hydrometeorological disasters by regulating water flow. However, rapid land-use changes driven by the construction of Yogyakarta International Airport (YIA) have altered the region’s environmental balance. This study investigates the water retention capacity of coastal soils in Kulon Progo and examines how differences across land-use types may influence flood risks. Rather than tracking changes over time, the study uses cross-sectional comparisons and historical land-use and flood data to infer potential impacts of land transformation on hydrological hazards. Field investigations using standard soil physical property analysis were conducted at nine sites across three villages (Jangkaran, Palihan, and Glagah) in Kulon Progo to capture variations in soil characteristics related to land use changes from the airport development and its buffer zones. Bulk density ranges from 1.16 g/cm³ to 2.18 g/cm³, particle density between 2.46 g/cm³ and 5.15 g/cm³, and porosity levels from 48.16% to 66.67%. Areas near converted lands show higher density and lower porosity, reducing infiltration and increasing surface runoff. Historical flood data from the Regional Disaster Management Agency (BPBD) indicates rising flood frequency over the past decade, especially after major land conversions. This trend aligns with the study’s findings, as areas with lower porosity experience recurrent flooding. The reduced absorption capacity due to increased soil compaction is a key factor driving flood risks. This research supports Indonesia’s Nationally Determined Contributions (NDC) roadmap for climate adaptation by providing empirical evidence for disaster risk reduction. The findings highlight the need to preserve salt marshes and integrate soil management into land-use planning to enhance climate resilience and mitigate future flood risks in the Kulon Progo coastal region.
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Copyright (c) 2025 Ikrom Mustofa, Niesa Hanum Mistoro, M. Said Ramdlan, Dewi Wulandari
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