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All Journal Indonesian Journal of Environment and Disaster
Nardi, Rajhi Febri
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Earth & Planetary Sciences Environmental Science

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Pemetaan Geohazard Banjir Lahar Pada Daerah Aliran Sungai Batang Malano, Gunung Marapi, Sumatera Barat Nardi, Rajhi Febri; Setiawan, Budhi
Indonesian Journal of Environment and Disaster Vol. 4 No. 2 (2025): Indonesian Journal of Environment and Disaster
Publisher : Disaster Research Center, Universitas Sebelas Maret, Surakarta, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20961/ijed.v4i2.2307

Abstract

Periodic volcanic activity at Mount Marapi from January to March 2024 resulted in the accumulation of volcanic material around the crater and on the slopes. Increased rainfall triggered landslides, which carried this material into rivers and caused cold lava floods in May 2024. This study applied the Normalized Morphometric Flood Index (NMFI) method, which normalizes seven morphometric parameters—drainage density, bifurcation ratio, ruggedness number, slope, dissection index, basin relief, and relief ratio—on a scale of 0 to 1. These were classified into three hazard levels: low (36.89%), medium (60.59%), and high (2.52%). The Batang Malano watershed shows high vulnerability upstream, decreasing to moderate downstream. Given Mount Marapi’s continued eruptions into 2025, the risk of future lava floods remains significant. Strategic mitigation planning, evacuation routes, and resilient infrastructure are urgently needed along the Batang Malano watershed.
Co-Authors Budhi Setiawan