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Hydrology and Earth System Sciences An interactive open-access journal of the European Geosciences Union
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https://doi.org/10.5194/hess-2019-694
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/hess-2019-694
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.

Submitted as: research article 26 Feb 2020

Submitted as: research article | 26 Feb 2020

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This preprint is currently under review for the journal HESS.

Development of a revised IHA method for the cumulative impacts of cascade reservoirs on flow regime

Xingyu Zhou1,2, Xiaorong Huang1,2, Hongbin Zhao1,2, and Kai Ma1,2 Xingyu Zhou et al.
  • 1State Key Laboratory of Hydraulics and Mountain River Engineering, Sichuan Chengdu 610065
  • 2College of Water Resource & Hydropower, Sichuan University, Chengdu, Sichuan 610065

Abstract. The impacts of reservoirs, especially multiple reservoirs, on the flow regimes and ecosystems of rivers have received increasing attention. The most widely used metrics to quantify the characteristics of flow regime alterations are the indicators of hydrologic alteration (IHA) which include 33 parameters. Due to the difference in the degree of alteration and the intercorrelation among IHA parameters, the comprehensive evaluation method that assigns the same weight to each indicator is obviously inadequate. A revised IHA method is proposed by utilizing the projection pursuit (PP) and real-coded accelerated genetic algorithm (RAGA). Data reliability is analysed by using the length of record (LOR) method. The projection values reflecting the comprehensive characteristics of the evaluation parameters are calculated. Based on these methods, a scientific and reliable evaluation of the cumulative impacts of cascading reservoirs on the flow regime was made by examining the Jinsha River. The results showed that with the continuous construction of reservoirs, the alteration degrees of IHA parameters gradually increased in Groups 1, 2, 3, and 4, but decreased in Group 5, and the flow duration curves showed characteristics of a head drop and tail lift. The flow regime alteration of the outlet section was more stable than before. This change had a negative impact on downstream fish reproduction and ecological protection. An attempt at ecological regulation was made to simulate the natural rising process of water.

Xingyu Zhou et al.

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Xingyu Zhou et al.

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Latest update: 03 Apr 2020
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Short summary
The main objective of this work is to discuss the cumulative effects on flow regime with the construction of cascade reservoirs. A revised IHA method was developed by using projection pursuit method based on the real-coded accelerated genetic algorithm in this study. Through this method, the IHA parameters with high contribution to hydrological alteration evaluation could be selected out and given high weight to reduce the redundancy among the IHA metrics.
The main objective of this work is to discuss the cumulative effects on flow regime with the...
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