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Geospatial Analysis of River Channel Shift of Babai River
Muma Ram Bhusal

Last modified: 2017-08-25

Abstract


Geospatial Analysis of River Channel Shift of Babai River

*MUMA RAM BHUSAL1, TARA BHUSAL2, AND BHARAT BHANDARI3

1,3Central Department of Environmental Science, Tribhuvan University, Kathmandu

2 The Institute of Forestry, Pokhara Campus, Tribhuvan University, Pokhara

E-mail: bmumaram@gmail.com

River channel shift is an outcome of natural and anthropogenic activities. Bank line migration and consequent channel shift is a common phenomenon of the mighty river like Babai. The Babai River, located in Bardia District, has shifted its channel because of natural causes. The area from Babai Bridge, Ratna Highway (28º 21ʹ 25ʺ N and 81º 42ʹ 47ʺ E) to 15.5 km downstream (28º 23ʹ 23ʺ and 81º 38ʹ 00ʺ E) was studied. The study analyzed the channel shift of the Babai River. Topo-map of 1996 and Google map of 2017 were used to reconstruct channel’s change in the study area. Georeferencing and digitization were done. The layer of 1996 and 2017 A.D. images of the study area were extracted using Arc GIS 10.2.1 and address the extent of bank line migration along with erosional and depositional areas. The result indicates that the river channel has shifted towards the northern side. A total area of 309179.62 m2 has eroded, among which an area of 141164.62 m2 eroded on the left bank and an area of 168015 m2 on the right bank. Similarly, an area of 552556.9 m2 has deposited, among which an area of 272548.30 m2 has deposited on the left bank and an area of 280008.60 m2 on the right bank. Floods during monsoon, lateral erosion and deposition were the main factors for the river channel shift. The Toe-erosion and earth cutting had increased due to the geological structure along the river.

Keywords: Arc GIS, Digitization, River Channel


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