Title: Risk assessment of flash flood potential in the humid tropics Indonesia: a case study in Tamiang River basin

Authors: Cut Azizah; Hidayat Pawitan; Bambang Dwi Dasanto; Iwan Ridwansyah; Muh Taufik

Addresses: Study Program of Applied Climatology, Department of Geophysical and Meteorology, Faculty of Mathematics and Natural Sciences, IPB University, West Java, Bogor, 16680, Indonesia; Study Program of Civil Engineering, Faculty of Engineering, Almuslim University, Aceh, Bireuen, 24211, Indonesia ' Department of Geophysics and Meteorology, Faculty of Mathematics and Natural Sciences, IPB University, West Java, Bogor, 16680, Indonesia ' Department of Geophysics and Meteorology, Faculty of Mathematics and Natural Sciences, IPB University, West Java, Bogor, 16680, Indonesia ' Research Center for Limnology, Indonesian Institute of Sciences, West Java, Cibinong, 16911, Jakarta, Indonesia ' Department of Geophysics and Meteorology, Faculty of Mathematics and Natural Sciences, IPB University, West Java, Bogor, 16680, Indonesia

Abstract: Assessment of areas prone to flash flood is a major challenge especially in limited data basin. This study aims to assess the areas vulnerable to flash flood in the Tamiang basin, Indonesia based on the flash flood potential index. The index depends on the physiographic influencing factors. Here, we improved the index by integrating antecedent precipitation index (API) and curve number (CN) as influencing factors and using an analytical hierarchy process (AHP) to determine the weighted factor. Historical flash flood locations were used to verify the index. The results show that the highest flash flood prone occurs in areas with high CN and API. Our findings were consistent with the historical flash flood events in the basin; therefore the use of weighted factor based on AHP is reliable. Moreover, our findings provide policymakers with the information needed to choose an appropriate management strategy to tackle possible future flash flood events.

Keywords: disaster; curve number; antecedent precipitation index; API; hazard; analytical hierarchy process; AHP; Indonesia.

DOI: 10.1504/IJHST.2022.119236

International Journal of Hydrology Science and Technology, 2022 Vol.13 No.1, pp.57 - 73

Received: 22 Jan 2020
Accepted: 10 Jul 2020
Published online: 30 Nov 2021 *

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