Dam-Induced Alteration in Seasonal Fluvial Discharge Time Series in Kali Gandaki Hydropower Dam, Syangja, Nepal: An Application of Wavelet Analysis

The construction of dams across rivers controls the magnitude of downstream floods and limits the suspended sediment transport into the downstream areas. We elucidated the downstream hydrological alterations compared to upstream after the construction of Kali Gandaki ‘A’ hydropower dam, Syangja, Nep...

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Bibliographic Details
Published inJournal of Water and Environment Technology Vol. 19; no. 4; pp. 198 - 211
Main Authors Baniya, Mahendra B., Fujino, Takeshi, Baniya, Arjun, K.C., Shivaram, Jha, Biswo
Format Journal Article
LanguageEnglish
Published Tokyo Japan Society on Water Environment 2021
Japan Science and Technology Agency
Subjects
Analysis
Aquatic ecosystems
Construction
Dam construction
Dams
Downstream
ecological threshold
flood morphological characteristics
Floods
Flow velocity
Hydroelectric dams
Hydroelectric power
hydrological alteration
Hydrology
Monsoons
Physical characteristics
Rivers
Seasons
Sediment transport
Sediments
Suspended sediments
Terrestrial ecosystems
Terrestrial environments
Water deficit
Water depth
Wavelet analysis
Wind
Nepal
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Summary:The construction of dams across rivers controls the magnitude of downstream floods and limits the suspended sediment transport into the downstream areas. We elucidated the downstream hydrological alterations compared to upstream after the construction of Kali Gandaki ‘A’ hydropower dam, Syangja, Nepal using continuous wavelet analysis, cross wavelet analysis and wavelet coherence. The downstream fluvial flow in winter and pre-monsoon seasons showed highest water deficit condition compared to monsoon and post-monsoon seasons. The dam-induced changes in fluvial flow with decreasing amount of sediment alter the downstream flood morphological characteristics of river reach such as flood depth, wetted perimeter of river section, flow velocity, and maximum and minimum floods together with the decrease in amount of suspended sediment. The dam-induced downstream alterations directly or indirectly create stress on the aquatic as well as terrestrial ecosystems. The findings of this study will be useful for hydropower dam gates operation that fulfils the minimum ecological threshold.
ISSN:1348-2165
1348-2165
DOI:10.2965/jwet.20-133