Connectivity structure of the Kosi Megafan and role of rail-road transport network

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dc.contributor.author Kumar, Rakesh
dc.contributor.author Jain, Vikrant
dc.contributor.author Babu, G. Prasad
dc.contributor.author Sinha, Rajiv
dc.date.accessioned 2014-06-26T05:09:46Z
dc.date.available 2014-06-26T05:09:46Z
dc.date.issued 2014-12
dc.identifier.citation Kumar, Rakesh; Jain, Vikrant; Babu, G. Prasad and Sinha, Rajiv, "Connectivity structure of the Kosi Megafan and role of rail-road transport network", Geomorphology, DOI: 10.1016/j.geomorph.2014.04.031, Dec. 2014. en_US
dc.identifier.issn 0169-555X
dc.identifier.uri http://dx.doi.org/10.1016/j.geomorph.2014.04.031
dc.identifier.uri https://repository.iitgn.ac.in/handle/123456789/1316
dc.description.abstract Movement of biophysical fluxes and resultant processes are governed by among other things, the (dis)connectivity structure of a landform. Hence, the quantification of connectivity structure of a landform is important in order to analyze water and sediment fluxes over a surface. Two dimensional connectivity structure through analysis of lateral and longitudinal connectivity for water and sediment flux has been quantitatively defined for the well-known Kosi megafan in north India. The avulsive behavior of the Kosi River has resulted in various paleochannels over the megafan, and they guide the flux transfer over the surface and also control the local topography of the megafan. As (dis)connectivity structure of landform is governed by its physical characteristics and also affected by anthropogenic disturbances, both these factors have been considered to quantitatively analyze the connectivity structure of the Kosi megafan for sediment and water fluxes. Megafan surface characteristics have been defined through local slope variability, land use-land cover map and flow length. These surface parameters have been used to map ‘buffers’ in the area. The distribution pattern of ‘buffers’ on the megafan surface has been used to define the ‘natural’ (dis)connectivity structure. Further, the megafan surface has also been affected by progressive development of the rail-road transport network, which is mostly east-west aligned and intersects the south flowing paleochannels. These rail-road network acts as an anthropogenic ‘barrier’ for water and sediment fluxes across the megafan surface. A detailed mapping of rail and road network in different years (1955, 1983 and 2010) has been used to characterize anthropogenic disturbance on the connectivity structure. The spatio-temporal variation in connectivity structure is attributed to density of the transport network. Finally, natural and anthropogenic disturbances on connectivity structure have also been integrated to quantitatively define the present day connectivity structure of the Kosi megafan for water as well as for sediment flux. Further, the (dis)connectivity structure has been used to explain the spatial variability of waterlogging over the megafan surface, which is presently a serious hazard in the region. en_US
dc.description.statementofresponsibility by Rakesh Kumar, Vikrant Jain, G.Prasad Babu and Rajiv Sinha
dc.format.extent vol. 227, pp. 73-86
dc.language.iso en en_US
dc.publisher Elsevier en_US
dc.subject Disconnectivity en_US
dc.subject Effective catchment area en_US
dc.subject Kosi megafan en_US
dc.subject Sediment flux en_US
dc.subject Transport network en_US
dc.subject Waterlogging en_US
dc.title Connectivity structure of the Kosi Megafan and role of rail-road transport network en_US
dc.type Article en_US
dc.relation.journal Geomorphology


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