Landslide hazard zonation mapping using frequency ratio and fuzzy logic approach, a case study of Lachung Valley, Sikkim
Abstract Background Sikkim Himalaya is under consistent distress due to landslides. Abrupt thrust on infrastructure development in the valley regions of Sikkim Himalaya has led to a need for a prior planning to face landslide hazard. A comprehensive study for the identification of landslide hazard z...
Published in: | Geoenvironmental Disasters |
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Format: | Article in Journal/Newspaper |
Language: | English |
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Springer Science and Business Media LLC
2015
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Online Access: | http://dx.doi.org/10.1186/s40677-014-0009-y http://link.springer.com/content/pdf/10.1186/s40677-014-0009-y.pdf http://link.springer.com/article/10.1186/s40677-014-0009-y/fulltext.html http://link.springer.com/content/pdf/10.1186/s40677-014-0009-y https://link.springer.com/content/pdf/10.1186/s40677-014-0009-y.pdf |
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crspringernat:10.1186/s40677-014-0009-y 2023-05-15T17:58:24+02:00 Landslide hazard zonation mapping using frequency ratio and fuzzy logic approach, a case study of Lachung Valley, Sikkim Anbalagan, Rathinam Kumar, Rohan Lakshmanan, Kalamegam Parida, Sujata Neethu, Sasidharan 2015 http://dx.doi.org/10.1186/s40677-014-0009-y http://link.springer.com/content/pdf/10.1186/s40677-014-0009-y.pdf http://link.springer.com/article/10.1186/s40677-014-0009-y/fulltext.html http://link.springer.com/content/pdf/10.1186/s40677-014-0009-y https://link.springer.com/content/pdf/10.1186/s40677-014-0009-y.pdf en eng Springer Science and Business Media LLC http://creativecommons.org/licenses/by/4.0 CC-BY Geoenvironmental Disasters volume 2, issue 1 ISSN 2197-8670 Management, Monitoring, Policy and Law Geotechnical Engineering and Engineering Geology Environmental Science (miscellaneous) Safety, Risk, Reliability and Quality Geography, Planning and Development journal-article 2015 crspringernat https://doi.org/10.1186/s40677-014-0009-y 2022-01-14T15:35:53Z Abstract Background Sikkim Himalaya is under consistent distress due to landslides. Abrupt thrust on infrastructure development in the valley regions of Sikkim Himalaya has led to a need for a prior planning to face landslide hazard. A comprehensive study for the identification of landslide hazard zones using landslide frequency ratio and fuzzy logic in GIS environment has been presented for the Lachung valley, Sikkim, India, where a number of hydroelectric projects are proposed. Temporal remote sensing data was used to generate significant landslide causative factors in addition to landslide inventory. Primary topographic attributes namely slope, aspect and relative relief were derived from digital elevation model. Landslide frequency ratio approach was adopted to correlate landslide causal factors with landslide incidences. Further, fuzzy logic method was used for the integration of landslide causative factors in order to delineate the landslide hazard zones. Fuzzy memberships were derived from the landslide frequency ratio values. Different gamma values were used in fuzzy gamma integration process, which resulted different landslide hazard index maps. Receiver operating characteristic curves were prepared to analyze consistency of the resulting landslide hazard index maps. Results Landslide frequency ratio values have emphasised the importance of factors/classes in landsliding. High slope angle (35°-45°), very high slope category (>45°), High and very high relative relief categories; south, southeast and southwest aspects; drainage and lineaments buffer range of 0-50m, 50-100m and 100 to 150m; quartzite/garnet schist and migmatite type of lithology; Sandy loam and Rock/loam classes of soils; fallow land and sparse vegetation classes of land use/land cover were found to be associated with landsliding. Five landslide hazard zonation maps with each comprising five relative landslide hazard zones namely; very low, low, moderate, high and very high hazard zones were prepared by using five fuzzy gamma operators. Maps indicated that steep talus slopes, close proximity to drainages, ridges and spars fall under high hazard zones. Settlement areas were observed in low to moderate hazard zones. Very high hazard zones were observed in steep slopes, cliffs and cut slopes excavated for the roads. Low hazard zones were observed in agricultural terraces and permafrost areas. Conclusions Hence it can be concluded that landslide causative factor’s integration using fuzzy logic has yielded good results for Lachung valley. Frequency ratio method for determination of fuzzy membership value has reduced subjectivity in the model. The final LHZ map (γ = 0.92) can be used for the planning of future infrastructure, settlement and ecological development in Lachung region. Article in Journal/Newspaper permafrost Springer Nature (via Crossref) Geoenvironmental Disasters 2 1 |
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Open Polar |
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Springer Nature (via Crossref) |
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crspringernat |
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English |
topic |
Management, Monitoring, Policy and Law Geotechnical Engineering and Engineering Geology Environmental Science (miscellaneous) Safety, Risk, Reliability and Quality Geography, Planning and Development |
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Management, Monitoring, Policy and Law Geotechnical Engineering and Engineering Geology Environmental Science (miscellaneous) Safety, Risk, Reliability and Quality Geography, Planning and Development Anbalagan, Rathinam Kumar, Rohan Lakshmanan, Kalamegam Parida, Sujata Neethu, Sasidharan Landslide hazard zonation mapping using frequency ratio and fuzzy logic approach, a case study of Lachung Valley, Sikkim |
topic_facet |
Management, Monitoring, Policy and Law Geotechnical Engineering and Engineering Geology Environmental Science (miscellaneous) Safety, Risk, Reliability and Quality Geography, Planning and Development |
description |
Abstract Background Sikkim Himalaya is under consistent distress due to landslides. Abrupt thrust on infrastructure development in the valley regions of Sikkim Himalaya has led to a need for a prior planning to face landslide hazard. A comprehensive study for the identification of landslide hazard zones using landslide frequency ratio and fuzzy logic in GIS environment has been presented for the Lachung valley, Sikkim, India, where a number of hydroelectric projects are proposed. Temporal remote sensing data was used to generate significant landslide causative factors in addition to landslide inventory. Primary topographic attributes namely slope, aspect and relative relief were derived from digital elevation model. Landslide frequency ratio approach was adopted to correlate landslide causal factors with landslide incidences. Further, fuzzy logic method was used for the integration of landslide causative factors in order to delineate the landslide hazard zones. Fuzzy memberships were derived from the landslide frequency ratio values. Different gamma values were used in fuzzy gamma integration process, which resulted different landslide hazard index maps. Receiver operating characteristic curves were prepared to analyze consistency of the resulting landslide hazard index maps. Results Landslide frequency ratio values have emphasised the importance of factors/classes in landsliding. High slope angle (35°-45°), very high slope category (>45°), High and very high relative relief categories; south, southeast and southwest aspects; drainage and lineaments buffer range of 0-50m, 50-100m and 100 to 150m; quartzite/garnet schist and migmatite type of lithology; Sandy loam and Rock/loam classes of soils; fallow land and sparse vegetation classes of land use/land cover were found to be associated with landsliding. Five landslide hazard zonation maps with each comprising five relative landslide hazard zones namely; very low, low, moderate, high and very high hazard zones were prepared by using five fuzzy gamma operators. Maps indicated that steep talus slopes, close proximity to drainages, ridges and spars fall under high hazard zones. Settlement areas were observed in low to moderate hazard zones. Very high hazard zones were observed in steep slopes, cliffs and cut slopes excavated for the roads. Low hazard zones were observed in agricultural terraces and permafrost areas. Conclusions Hence it can be concluded that landslide causative factor’s integration using fuzzy logic has yielded good results for Lachung valley. Frequency ratio method for determination of fuzzy membership value has reduced subjectivity in the model. The final LHZ map (γ = 0.92) can be used for the planning of future infrastructure, settlement and ecological development in Lachung region. |
format |
Article in Journal/Newspaper |
author |
Anbalagan, Rathinam Kumar, Rohan Lakshmanan, Kalamegam Parida, Sujata Neethu, Sasidharan |
author_facet |
Anbalagan, Rathinam Kumar, Rohan Lakshmanan, Kalamegam Parida, Sujata Neethu, Sasidharan |
author_sort |
Anbalagan, Rathinam |
title |
Landslide hazard zonation mapping using frequency ratio and fuzzy logic approach, a case study of Lachung Valley, Sikkim |
title_short |
Landslide hazard zonation mapping using frequency ratio and fuzzy logic approach, a case study of Lachung Valley, Sikkim |
title_full |
Landslide hazard zonation mapping using frequency ratio and fuzzy logic approach, a case study of Lachung Valley, Sikkim |
title_fullStr |
Landslide hazard zonation mapping using frequency ratio and fuzzy logic approach, a case study of Lachung Valley, Sikkim |
title_full_unstemmed |
Landslide hazard zonation mapping using frequency ratio and fuzzy logic approach, a case study of Lachung Valley, Sikkim |
title_sort |
landslide hazard zonation mapping using frequency ratio and fuzzy logic approach, a case study of lachung valley, sikkim |
publisher |
Springer Science and Business Media LLC |
publishDate |
2015 |
url |
http://dx.doi.org/10.1186/s40677-014-0009-y http://link.springer.com/content/pdf/10.1186/s40677-014-0009-y.pdf http://link.springer.com/article/10.1186/s40677-014-0009-y/fulltext.html http://link.springer.com/content/pdf/10.1186/s40677-014-0009-y https://link.springer.com/content/pdf/10.1186/s40677-014-0009-y.pdf |
genre |
permafrost |
genre_facet |
permafrost |
op_source |
Geoenvironmental Disasters volume 2, issue 1 ISSN 2197-8670 |
op_rights |
http://creativecommons.org/licenses/by/4.0 |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.1186/s40677-014-0009-y |
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Geoenvironmental Disasters |
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2 |
container_issue |
1 |
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1766167015729397760 |