Impact of Land Use Change on Flood Inundation Areas
Abstract
The recent flood disasters in Indonesia between 2020 and 2023 resulted in more than 1,500 incidents annually. These flood events have become more widespread in terms of the areas affected, duration, depth, and frequency. The increasing scale of flooding can have a significant impact on the inundation area. This research examines the changes in the flood inundation area each year due to the consequences of land use alterations in the watershed, which are responsible for the flood disasters. The research methodology consists of literature study and analysis of land use change based on the satellite Citra in 2014, 2015, and 2021; the research location is in the Karangmumus watershed, Talangsari sub-watershed in Samarinda. The findings indicated that the rainfall depth was 70 mm, and the area inundated to a depth greater than 0.7 m was 4.6 ha; the area inundated to a depth greater than 0.5 m was 7.54 ha, and the area inundated to a depth greater than 0.3 m was 21.56 ha. Changes in the extent of flood inundation have an effect on the level of the flood inundation zone. The findings from this study can serve as a basis for establishing the guidelines for watershed region usage.
Keywords: flood, land use, inundation area, disaster.
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