- [ONLINE] EP34B-06: Post-Disaster Landscape Recovery: Interactions Between Landslides, Vegetation Regrowth, and Soil Moisture in the Himalayas
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Anamika Sekar, Indian Institute of Technology Roorkee (First Author, Presenting Author)
Srikrishnan Siva Subramanian, Indian Institute of Technology Roorkee
In 2013, the Indian Himalayas experienced a devastating flood and landslide event that reshaped the landscape. Many slopes experienced landslides, introducing long-term instability, and some remain barren even after a decade. In this study, we assessed how vegetation has regrown on over 700 landslide-affected sites from 2013 to 2023 and explored how soil moisture influences this recovery. Using satellite imagery, we measured vegetation health through an index and combined this with global reanalysis data to track soil moisture patterns. Vegetation declined sharply after 2013 and remained low for a few years. Recovery peaked until around 2018, followed by another dip after 2021, suggesting that recovery is not linear or predictable. We observed that areas with seasonally varying moderate soil moisture tended to recover faster, while slopes that remained persistently wet or were in cold, shaded, high-altitude zones above 3000 m showed slower regrowth, likely due to poor growing conditions. Our findings offer insight into post-disaster landscape recovery and could help identify which landslide zones are likely to recover naturally and which may require restoration efforts.
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