Pemodelan Banjir Berdasarkan Pendekatan Hidrometeorologi dan Perubahan Tutupan Lahan di Sub-DAS Distrik Abepura

Finnyalia Napitupulu; Johnson Siallagan; Maklon Warpur

doi:10.61132/globe.v3i2.803

Authors

Finnyalia Napitupulu Universitas Cenderawasih
Johnson Siallagan Universitas Cenderawasih
Maklon Warpur Universitas Cenderawasih

DOI:

https://doi.org/10.61132/globe.v3i2.803

Keywords:

Land Cover Change, Flood Modelling, Curve Number

Abstract

Land cover change has a significant impact on the hydrology of watershed areas, including increasing flood risk. This study aims to analyze land cover changes in the Siborgonyi and Acai sub-watersheds between 2013 and 2022 and their impact on flood potential. The methods used include spatial analysis with GIS, flood modeling using HEC-RAS, and Curve Number (CN) calculations to identify changes in soil infiltration capacity. The results show that land cover changes have a substantial effect on the increase in flood risk. The reduction of forest areas and the expansion of built-up land indicate a large-scale conversion of natural vegetation into residential and infrastructure areas. CN values in 2022 increased across most areas, indicating reduced soil infiltration capacity and increased surface runoff. Flood modeling shows that both the extent and depth of inundation significantly increased in 2022, particularly in downstream areas with basin-like topography.

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