Avulsion threshold and planform dynamics of the Kosi River in north Bihar (India) and Nepal: a GIS framework

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dc.contributor.author Sinha, Rajiv
dc.contributor.author Sripriyanka, K.
dc.contributor.author Jain, Vikrant
dc.contributor.author Mukul, Malay
dc.contributor.author Murty, C.V.R.
dc.contributor.author Bansal, Dipanshu
dc.date.accessioned 2014-06-25T11:56:54Z
dc.date.available 2014-06-25T11:56:54Z
dc.date.issued 2014-07
dc.identifier.citation Sinha, R.; Sripriyanka, K.; Jain, Vikrant Mukul, Malay; Murty, C.V.R. and Bansal, Dipanshu, "Avulsion threshold and planform dynamics of the Kosi River in north Bihar (India) and Nepal: a GIS framework", Geomorphology, DOI: 10.1016/j.geomorph.2014.03.035, vol. 26, pp. 157-170, July 2014. en_US
dc.identifier.issn 0169-555X
dc.identifier.uri http://dx.doi.org/10.1016/j.geomorph.2014.03.035
dc.identifier.uri https://repository.iitgn.ac.in/handle/123456789/1305
dc.description.abstract Models for river avulsions have identified the ratio between down-valley and cross-valley slopes of channels as the triggering factors for the sudden channel shift but have remained untested in the field. The August 2008 avulsion of the Kosi River at Kusaha, 12 km upstream of the Kosi barrage in Nepal, provided an opportunity to study a large-scale avulsion (~ 120 km) for its causal factors and driving mechanisms. We used the SRTM-based digital elevation model and remotely sensed data coupled with field topographic mapping with a kinematic GPS and a Total Station to characterise a ~ 50-km-long stretch of the Kosi River. We have computed reach-scale avulsion threshold index (ATI) integrating SRTM-derived slopes and planform dynamics on a GIS platform. We show that several reaches along the Kosi River are avulsion-prone, including the Kusaha point that is consistent with the August 2008 avulsion. We suggest that apart from cross-valley and down-valley slopes, planform dynamics such as thalweg shift, sinuosity variation, and channel multiplicity significantly influence the avulsion threshold in alluvial reaches of the rivers such as the Kosi. en_US
dc.description.statementofresponsibility by Vikrant Jain et al.,
dc.format.extent Vol. 216, No. 1, pp. 157–170
dc.language.iso en en_US
dc.publisher Elsevier en_US
dc.subject Alluvial rivers en_US
dc.subject Avulsion models en_US
dc.subject Avulsion prediction en_US
dc.subject Kosi River en_US
dc.subject Planform dynamics en_US
dc.subject Threshold condition en_US
dc.title Avulsion threshold and planform dynamics of the Kosi River in north Bihar (India) and Nepal: a GIS framework en_US
dc.type Article en_US
dc.relation.journal Geomorphology

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