Impact of Tilpara barrage on backwater reach of Kushkarni River: a tributary of Mayurakshi River

Swades Pal ()
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Swades Pal: University of Gour Banga

Environment, Development and Sustainability: A Multidisciplinary Approach to the Theory and Practice of Sustainable Development, 2017, vol. 19, issue 5, No 25, 2115-2142

Abstract: Abstract Tilpara barrage over Mayurakshi River has exerted crucial impact on backwater reach of river Kushkarni (4.5 km upstream reach) which debouches to Mayurakshi River at immediate upstream head of this barrage. Study area is located at the Chota Nagpur plateau fringe highly erodible Rarh tract of Birbhum district of West Bengal. From this study, it is found that due to storage of water in the reservoir, backwater created and confluence part of the Kushkarni River is submerged. Stagnation of reservoir water reduced carrying capacity of channel by 26 %, and it is facilitated by declining trend of channel bed slope and velocity of flow. Depth of channel is attenuated by 17–71 cm depositing 919,342.6 m3 of coarser sediment load. In this circumstance, high flood level frequency in same inflow state has increased by 26.5 % and channel braiding has started to nucleate. Alternate textural sequence of materials from river bed reveals some irregular episodic inflow events within reservoir. Episodic discharge and consequent large flood have created thick sand splay cover in the left side of the channel and damaged agricultural land. Potential bank erosion hazard index or BEHI is considerably high (27.35–31.73) in this backwater reach, and the process is mainly triggered by liquefaction. Considering existing forms and functions of the study segment, it is evaluated with existing reservoir upstream channel morphology model of Skalak et al. (2013) and found to be proximate. Such alteration of channel morphology in this segment is linked with socio-ecological fabric of the surrounding area. Along with channel morphological readjustment, socio-ecological setup is also moving toward new adjustment.

Keywords: Tilpara reservoir; Channel backwaters; Aggradations; Coarsening of bed; Arrhythmic sediment succession; Sand splay (search for similar items in EconPapers)
Date: 2017
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DOI: 10.1007/s10668-016-9833-4

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