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The relationship between geology and rock weathering on the rock instability along Mugling-Narayanghat road corridor, Central Nepal Himalaya

The present study was conducted along the Mugling–Narayanghat road section and its surrounding region that is most affected by landslide and related mass-movement phenomena. The main rock types in the study area are limestone, dolomite, slate, phyllite, quartzite and amphibolites of Lesser Himalaya,...

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Main Authors: Pradhan, Biswajeet, Regmi, Amar Deep, Kohki, Yoshida, Hidehisa, Nagata, Pradhan, Ananta Man Singh, Pourghasemi, Hamid Reza
Format: Article
Language:English
English
Published: 2013
Online Access:http://psasir.upm.edu.my/id/eprint/28533/1/The%20relationship%20between%20geology%20and%20rock%20weathering%20on%20the%20rock%20instability%20along%20Mugling.docx
http://psasir.upm.edu.my/id/eprint/28533/
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spelling my.upm.eprints.285332015-10-28T06:30:13Z http://psasir.upm.edu.my/id/eprint/28533/ The relationship between geology and rock weathering on the rock instability along Mugling-Narayanghat road corridor, Central Nepal Himalaya Pradhan, Biswajeet Regmi, Amar Deep Kohki, Yoshida Hidehisa, Nagata Pradhan, Ananta Man Singh Pourghasemi, Hamid Reza The present study was conducted along the Mugling–Narayanghat road section and its surrounding region that is most affected by landslide and related mass-movement phenomena. The main rock types in the study area are limestone, dolomite, slate, phyllite, quartzite and amphibolites of Lesser Himalaya, sandstone, mudstone and conglomerates of Siwaliks and Holocene Deposits. Due to the important role of geology and rock weathering in the instabilities, an attempt has been made to understand the relationship between these phenomena. Consequently, landslides of the road section and its surrounding region have been assessed using remote sensing, Geographical information systems and multiple field visits. A landslide inventory map was prepared and comprising 275 landslides. Nine landslides representing the whole area were selected for detailed studies. Field surveys, integrated with laboratory tests, were used as the main criteria for determining the weathering zones in the landslide area. From the overall study, it is seen that large and complex landslides are related to deep rock weathering followed by the intervention of geological structures as faults, joints and fractures. Rotational types of landslides are observed in highly weathered rocks, where the dip direction of the foliation plane together with the rock weathering plays a principle role. Shallow landslides are developed in the slope covered by residual soil or colluviums. The rock is rather fresh below these covers. Some shallow landslides (rock topples) are related to the attitude of the foliation plane and are generally observed in fresh rocks. Debris slides and debris flows occur in colluviums or residual soil-covered slopes. In few instances, they are also related to the rock fall occurring at higher slopes. The materials from the rock fall are mixed with the colluviums and other materials lying on the slope downhill and flow as debris flow. Rock falls are mainly related to the joint pattern and the slope angle. They are found in less-weathered rocks. From all these, it is concluded that the rock weathering followed by geological structures has prominent role in the rock slope instability along Mugling–Narayanghat road section and its surrounding regions. 2013 Article PeerReviewed application/msword en http://psasir.upm.edu.my/id/eprint/28533/1/The%20relationship%20between%20geology%20and%20rock%20weathering%20on%20the%20rock%20instability%20along%20Mugling.docx Pradhan, Biswajeet and Regmi, Amar Deep and Kohki, Yoshida and Hidehisa, Nagata and Pradhan, Ananta Man Singh and Pourghasemi, Hamid Reza (2013) The relationship between geology and rock weathering on the rock instability along Mugling-Narayanghat road corridor, Central Nepal Himalaya. Natural Hazards, 66 (2013). pp. 501-532. ISSN 0921-030X 10.1007/s11069-012-0497-6 English
institution Universiti Putra Malaysia
building UPM Library
collection Institutional Repository
continent Asia
country Malaysia
content_provider Universiti Putra Malaysia
content_source UPM Institutional Repository
url_provider http://psasir.upm.edu.my/
language English
English
description The present study was conducted along the Mugling–Narayanghat road section and its surrounding region that is most affected by landslide and related mass-movement phenomena. The main rock types in the study area are limestone, dolomite, slate, phyllite, quartzite and amphibolites of Lesser Himalaya, sandstone, mudstone and conglomerates of Siwaliks and Holocene Deposits. Due to the important role of geology and rock weathering in the instabilities, an attempt has been made to understand the relationship between these phenomena. Consequently, landslides of the road section and its surrounding region have been assessed using remote sensing, Geographical information systems and multiple field visits. A landslide inventory map was prepared and comprising 275 landslides. Nine landslides representing the whole area were selected for detailed studies. Field surveys, integrated with laboratory tests, were used as the main criteria for determining the weathering zones in the landslide area. From the overall study, it is seen that large and complex landslides are related to deep rock weathering followed by the intervention of geological structures as faults, joints and fractures. Rotational types of landslides are observed in highly weathered rocks, where the dip direction of the foliation plane together with the rock weathering plays a principle role. Shallow landslides are developed in the slope covered by residual soil or colluviums. The rock is rather fresh below these covers. Some shallow landslides (rock topples) are related to the attitude of the foliation plane and are generally observed in fresh rocks. Debris slides and debris flows occur in colluviums or residual soil-covered slopes. In few instances, they are also related to the rock fall occurring at higher slopes. The materials from the rock fall are mixed with the colluviums and other materials lying on the slope downhill and flow as debris flow. Rock falls are mainly related to the joint pattern and the slope angle. They are found in less-weathered rocks. From all these, it is concluded that the rock weathering followed by geological structures has prominent role in the rock slope instability along Mugling–Narayanghat road section and its surrounding regions.
format Article
author Pradhan, Biswajeet
Regmi, Amar Deep
Kohki, Yoshida
Hidehisa, Nagata
Pradhan, Ananta Man Singh
Pourghasemi, Hamid Reza
spellingShingle Pradhan, Biswajeet
Regmi, Amar Deep
Kohki, Yoshida
Hidehisa, Nagata
Pradhan, Ananta Man Singh
Pourghasemi, Hamid Reza
The relationship between geology and rock weathering on the rock instability along Mugling-Narayanghat road corridor, Central Nepal Himalaya
author_facet Pradhan, Biswajeet
Regmi, Amar Deep
Kohki, Yoshida
Hidehisa, Nagata
Pradhan, Ananta Man Singh
Pourghasemi, Hamid Reza
author_sort Pradhan, Biswajeet
title The relationship between geology and rock weathering on the rock instability along Mugling-Narayanghat road corridor, Central Nepal Himalaya
title_short The relationship between geology and rock weathering on the rock instability along Mugling-Narayanghat road corridor, Central Nepal Himalaya
title_full The relationship between geology and rock weathering on the rock instability along Mugling-Narayanghat road corridor, Central Nepal Himalaya
title_fullStr The relationship between geology and rock weathering on the rock instability along Mugling-Narayanghat road corridor, Central Nepal Himalaya
title_full_unstemmed The relationship between geology and rock weathering on the rock instability along Mugling-Narayanghat road corridor, Central Nepal Himalaya
title_sort relationship between geology and rock weathering on the rock instability along mugling-narayanghat road corridor, central nepal himalaya
publishDate 2013
url http://psasir.upm.edu.my/id/eprint/28533/1/The%20relationship%20between%20geology%20and%20rock%20weathering%20on%20the%20rock%20instability%20along%20Mugling.docx
http://psasir.upm.edu.my/id/eprint/28533/
_version_ 1643829493354201088
score 13.211869

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