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Evaluating pedogenesis and soil Atterberg limits for inducing landslides in the Western Ghats, Idukki District of Kerala, South India

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Title Evaluating pedogenesis and soil Atterberg limits for inducing landslides in the Western Ghats, Idukki District of Kerala, South India
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Creator Lalitha, M, K.S. Anil Kumar, K.M. Nair, S. Dharumarajan, Arti Koyal, Shivanand, S. Kaliraj and Rajendra Hegde
 
Subject Soil properties · Pedogenic processes · Atterberg limits · Landslides · Western Ghats
 
Description Not Available
In the Western Ghats of India, the soil properties, particularly Atterberg limits, are of relevance
to the landslides. Pedogenic processes in the Western Ghats and plateaus on it are
regulated by parent materials, relief (topography), organisms, climate, and time. In this
study, the five major soils found within the mid-part of the Western Ghats in the Idukki
district of Kerala, Southern India was analyzed for elucidating physical, chemical, and
geotechnical properties (Atterberg limits) on landslides potentiality or slope failure processes.
The result reveals that the highly weathered lateritic soils noted with lower KCl pH
(3.6–4.6), low-cation exchange capacity (3.1 to 19.6 cmol( +) kg−
1), low-effective cation
exchange capacity (0.8 to 10.7 cmol( +) kg−
1) and a negative ΔpH value indicate the presence
of variable charge minerals such as amorphous sesquioxides. The variable ranking
of random forest revealed that the soil Atterberg limits were significantly influenced by
Citrate Bicarbonate Dithionite (CBD) iron, sand fractions, and organic carbon. The layer
of porous sandy soils showed lower Atterberg limits due to accentuate with clay matter,
whereas the illuvial layer (Bt) have noted as higher Atterberg limits that lead to potentially
collapsing gullies or triggering mass movement during heavy rainfall followed by intensive
runoff due to instability of soil mass within proxy of the steeply sloping surface. Soil
geotechnical properties such as liquid limit, plastic limit, and plasticity index are the main
characteristics that decide the slope stability and failure in various parts of the study area,
whereas the soil profile morphometry has significantly associated with the occurrence of
landslides with the plastic limit value between 28.01 and 40.48. It was noticed that the
failed slopes have a higher value than stable slopes along with the hill-range topography,
with soil particle sizes range of silt and clay (8.79 to 36.17 and 22.31 to 57.74%) with the
measurement of liquid limit (40.05 to 68.4), plastic limit (24.2 to 43.94), and plasticity
index (7.81 to 24.8). This indicates that the pedogenesis of the weathering profile of soils
have significantly influenced the Atterberg limits that triggering slope failure or landslides
along the gullies and weathered lateritic uplands.
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Date 2021-07-28T14:01:03Z
2021-07-28T14:01:03Z
2021-01-02
 
Type Research Paper
 
Identifier Lalitha, M., Anil Kumar, K. S., Nair, K. M., Dharumarajan, S., Arti Koyal, Shivanand Khandal, Kaliraj S. & Rajendra Hegde. 2021. Evaluating pedogenesis and soil Atterberg limits for inducing landslides in the Western Ghats, Idukki District of Kerala, South India. Nat Hazards. https://doi.org/10.1007/s11069-020-04472-0
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http://krishi.icar.gov.in/jspui/handle/123456789/50885
 
Language English
 
Relation Not Available;
 
Publisher Not Available