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Development of a revised method for indicators of hydrologic alteration for analyzing the cumulative impacts of cascading reservoirs on flow regime
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Development of a revised method for indicators of hydrologic alteration for analyzing the cumulative impacts of cascading reservoirs on flow regime
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Journal Article
Development of a revised method for indicators of hydrologic alteration for analyzing the cumulative impacts of cascading reservoirs on flow regime
2020
Overview
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 (IHAs) which include
33 parameters. Due to the difference in the degree of alteration and the
intercorrelation among IHA parameters, the conventional method of evaluating
IHA parameters 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 analyzed 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 increase in the number of reservoirs, the alteration degrees
of IHA parameters gradually increased in groups 1, 2, 3 and 4 but
decreased in group 5 (each group addresses the magnitude, timing, frequency,
duration and rate of change in turn), and the flow duration curves showed a
declining trend at the high-flow part and an increasing trend at the low-flow part. 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, and four major
Chinese carps have a positive response to the flood peak process caused by
manual regulation.
