Compositional Analysis of Reactivated Landslide Soil from Kodari, Sindhupalchok District, Nepal
DOI:
https://doi.org/10.64862/Keywords:
Paleolandslide, Nepal Himalaya, compositional analysis, Kodari IntroductionAbstract
The tectonically active and climatically dynamic Himalayas are prone to landslide reactivation. The soil compositional ratio of the Kodari reactivated landslide is examined utilizing compositional statistical analysis. Altogether 40 soil samples were collected from the total landslide area. General sieve analysis yielded gravel, sand, and fines. Grain-size distribution and compositional analyses show a sand–gravel matrix with few fines, whereas centered log-ratio (clr) transformation shows fines as the most important variable and hydrologically sensitive component. The dominant sand-gravel composition affects infiltration and underground percolation. The low-plastic coarse-grained soil deformed because of the 2015 Gorkha earthquake and frequent aftershocks and began to move in the monsoon. This compositional method provides a mechanical explanation for Himalayan slope failures and helps with hazard assessment and slope management.
References
Bhandari, B. P., & Dhakal, S. (2020). Compositional analysis and phase relations of soil mass from the active landslides of Babai River watershed, Siwalik zone of Nepal. Engineering Geology, 278, 105851. https://doi.org/10.1016/j.enggeo.2020.105851
Roback, K., Clark, M. K., West, A. J., Zekkos, D., Li, G., Gallen, S. F., ... & Godt, J. W. (2018). The size, distribution, and mobility of landslides caused by the 2015 Mw7. 8 Gorkha earthquake, Nepal. Geomorphology, 301, 121-138. https://doi.org/10.1016/j.geomorph.2017.01.030
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