Rapid post-landslide vegetation regrowth detected using multi-temporal satellite imagery at Mt. Rinjani National Park, Lombok, Indonesia
Novia Lusiana (1)*, Galuh Egalita Adliya (2), Luhur Akbar Devianto (3), Nur Azuan Husin (4)

(1) Environmental Engineering Study Program, Faculty of Agricultural Technology, Universitas Brawijaya, 65145, Malang, Indonesia
(2) Environmental Engineering Study Program, Faculty of Agricultural Technology, Universitas Brawijaya, 65145, Malang, Indonesia
(3) Environmental Engineering Study Program, Faculty of Agricultural Technology, Universitas Brawijaya, 65145, Malang, Indonesia
(4) Department of Biological and Agricultural Engineering, Faculty of Engineering, Universiti Putra Malaysia, 43400 UPM, Serdang, Selangor, Malaysia

*Email: novialusiana[at]ub.ac.id

Abstract

Landslides frequently produce significant damage to the vegetation ecosystem, consequently reducing slope stability. Monitoring the periods of vegetation recovery following landslide events is crucial for assessing the reestablishment of slope stability. While previous studies have investigated vegetation recovery periods in non tropical regions, limited studies have been conducted in tropical environments such as Indonesia. This study aims to estimate the duration for the full recovery of vegetation after landslide occurrences and to determine the most affecting factors in vegetation recovery in Mount Rinjani National Park (MNRP), Lombok. Landslide areas in MNRP were identified by Google Earth, and vegetation recovery was assessed using Normalized Difference Vegetation Index (NDVI) derived from Sentinel 2 imagery from 2018 to 2024. Elevation, slope gradient, and slope aspects were selected as potential contributing factors in vegetation recovery. Based on linear regression analysis, the results indicate that approximately 6 years are required for full vegetation recovery, shorter than reported periods in non-tropical regions. Decision tree analysis identified elevation as the most contributing factor in vegetation recovery. Elevation of less than 1863 meters with slope gradients less than 18.89 degrees indicates experiencing rapid vegetation recovery. Additionally, slope aspects facing north, south, southern east, and southern west tend to be more conducive to vegetation regrowth.

Keywords: Keywords: landslide scars, NDVI, post landslides, vegetation recovery

Topic: Waste and environmental management and engineering