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Impact of river interventions on alluvial channel morphology
Rivers play a significant role for sustainment and development of human race. The number of river interventions is increasing to meet water and energy demand. The present paper discusses impacts of Rengali dam on Brahmani river, India. The first-order impact assessment is carried out with hydrological data analysis between upstream and downstream gauging stations. The second-order impact study integrates seasonal stream power evaluation and temporal variation of Brice Index (BI) and cut-off length at a critical river reach. The flow duration and sediment duration curves at downstream gauging station revealed that, lean season discharge has increased (260–300%) and peak suspended sediment concentration has decreased for downstream reach. The seasonal steam power analysis quantified increasing trend of pre-monsoon stream power (296 W/m to 811 W/m) for the river. The planform alteration study showed initiation of braiding (BI of 0.14 in 1975 to 2.33 in 2016), formation of multiple cut-offs and mid-channel bars predominantly in post-dam period. Two stages of planform responses (1985–2009 and 2009–2016) have been observed for the river after dam closure.
Impact of river interventions on alluvial channel morphology
Rivers play a significant role for sustainment and development of human race. The number of river interventions is increasing to meet water and energy demand. The present paper discusses impacts of Rengali dam on Brahmani river, India. The first-order impact assessment is carried out with hydrological data analysis between upstream and downstream gauging stations. The second-order impact study integrates seasonal stream power evaluation and temporal variation of Brice Index (BI) and cut-off length at a critical river reach. The flow duration and sediment duration curves at downstream gauging station revealed that, lean season discharge has increased (260–300%) and peak suspended sediment concentration has decreased for downstream reach. The seasonal steam power analysis quantified increasing trend of pre-monsoon stream power (296 W/m to 811 W/m) for the river. The planform alteration study showed initiation of braiding (BI of 0.14 in 1975 to 2.33 in 2016), formation of multiple cut-offs and mid-channel bars predominantly in post-dam period. Two stages of planform responses (1985–2009 and 2009–2016) have been observed for the river after dam closure.
Impact of river interventions on alluvial channel morphology
Pradhan, Chandan (author) / Chembolu, Vinay (author) / Dutta, Subashisa (author)
ISH Journal of Hydraulic Engineering ; 25 ; 87-93
2019-01-02
7 pages
Article (Journal)
Electronic Resource
English
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