Performing of spatial hydro-geomorphology analysis to detect the potential flood susceptibility in kr. keureuto watershed using ahp-mcdm approach

¹ Doctoral Prog., Post Grad. Prog., Syiah Kuala Univ., Banda Aceh 23111 Indonesia
^1,2,3,4 Civil Eng. Depart., Syiah Kuala Univ., Banda Aceh 23111 Indonesia
⁵ Undergraduate., Civil Eng. Depart., Syiah Kuala Univ., Banda Aceh 23111 Indonesia

^* Corresponding author: maimunrizalihadi@usk.ac.id

Abstract

Flood is one of the most destructive natural disasters that causes loss of lives, properties, and significant resources, repeatedly occurring throughout Aceh, particularly in North Aceh. Given the more frequent floods and their damaging effects, it appears urgent and crucial to enhance the identification and mapping of flood susceptibility. One method that has been developed is the flood susceptibility mapping method. However, this method cannot address the challenges of flood susceptibility zone delineation due to the uncertainty of evaluation processes and the complex nonlinear relationships between indicators and risk levels, given that flood mapping is a multi-criteria spatial decision problem requiring hydrologic and geographic information. The objectives of this research are to assess flood susceptibility using the AHP-MCDM and to integrate using GIS to produce flood susceptibility map in Kr. Keureuto Watershed. Seven criteria from hydrologic and geographic information of the watershed were collected and analyzed using ArcGIS, and the weight of criteria using AHP from 25 expert responders. The results shows that there are four distinct levels of flood susceptibility: very high, high, medium, and low vulnerable. Significantly, the downstream Kr. Keureuto watershed emerges as highly susceptible to flooding, compared to the upstream zone.