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

Q3 Environmental Science Journal of Water and Environment Technology Pub Date : 2021-01-01 DOI:10.2965/jwet.20-133

Mahendra B. Baniya, Takeshi Fujino, A. Baniya, Shivaram K.C., B. Jha

{"title":"Dam-Induced Alteration in Seasonal Fluvial Discharge Time Series in Kali Gandaki Hydropower Dam, Syangja, Nepal: An Application of Wavelet Analysis","authors":"Mahendra B. Baniya, Takeshi Fujino, A. Baniya, Shivaram K.C., B. Jha","doi":"10.2965/jwet.20-133","DOIUrl":null,"url":null,"abstract":"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, Sy-angja, 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 de creasing 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.","PeriodicalId":17480,"journal":{"name":"Journal of Water and Environment Technology","volume":null,"pages":null},"PeriodicalIF":0.0000,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Journal of Water and Environment Technology","FirstCategoryId":"1085","ListUrlMain":"https://doi.org/10.2965/jwet.20-133","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q3","JCRName":"Environmental Science","Score":null,"Total":0}

引用次数: 0

Abstract

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, Sy-angja, 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 de creasing 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.

查看原文

微信好友朋友圈 QQ好友复制链接

本刊更多论文

尼泊尔香嘉Kali Gandaki水电站季节流量变化的小波分析应用

跨江水坝的建设控制了下游洪水的规模，限制了悬沙向下游地区的运输。利用连续小波分析、交叉小波分析和小波相干分析等方法，研究了尼泊尔西昂加Kali Gandaki ' A '水电站建设后下游与上游的水文变化。与季风季节和季风后季节相比，冬季和季风前季节的下游水流表现出最高的亏水状况。随着泥沙量的减少，大坝引起的河流流量变化改变了河段下游洪水形态特征，如洪水深度、河段湿周、流速、最大和最小洪水以及悬沙量的减少。大坝引起的下游变化直接或间接地对水生和陆地生态系统造成压力。研究结果对满足最小生态阈值的水电站闸门运行具有一定的指导意义。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

求助全文

约1分钟内获得全文去求助

来源期刊

Journal of Water and Environment Technology Environmental Science-Water Science and Technology

CiteScore

1.80

自引率

0.00%

发文量

审稿时长

43 weeks

期刊介绍： The Journal of Water and Environment Technology is an Open Access, fully peer-reviewed international journal for all aspects of the science, technology and management of water and the environment. The journal’s articles are clearly placed in a broader context to be relevant and interesting to our global audience of researchers, engineers, water technologists, and policy makers. JWET is the official journal of the Japan Society on Water Environment (JSWE) published in English, and welcomes submissions that take basic, applied or modeling approaches to the interesting issues facing the field. Topics can include, but are not limited to: water environment, soil and groundwater, drinking water, biological treatment, physicochemical treatment, sludge and solid waste, toxicity, public health and risk assessment, test and analytical methods, environmental education and other issues. JWET also welcomes seminal studies that help lay the foundations for future research in the field. JWET is committed to an ethical, fair and rapid peer-review process. It is published six times per year. It has two article types: Original Articles and Review Articles.