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http://dx.doi.org/10.3741/JKWRA.2021.54.12.1223

Flow regime analysis method by using discharge Gini coefficient  

Park, Tae Sun (Department of National Territorial Environment & Resources Research, Korea Research Institute for Human Settlements)
Publication Information
Journal of Korea Water Resources Association / v.54, no.12, 2021 , pp. 1223-1232 More about this Journal
Abstract
In this study, a new analysis method by using a "Discharge Gini Coefficient" is presented to determine the degree of inequality in daily discharge throughout the year. The Discharge Gini Coefficient can be calculated using the area relationship with the cumulative percentage of the daily mode discharge in the ascending order according to the cumulative percentage of the date of occurrence of the daily discharge throughout the year. The Discharge Gini Coefficient is presented as a value between 0 and 1, and the degree of inequality can be divided into 5 levels. The Discharge Gini Coefficient can be used to estimate the discharge stability of the downstream point relative to the upstream point. In addition, it is possible to quantify the influence of each reference discharge on the total inequality. The applicability of the Discharge Gini Coefficient was reviewed using long-term daily discharge data at eight points upstream and downstream of the four major rivers in Korea. The Discharge Gini Coefficient can also be used to analyze the discharge control effect in the downstream by the upstream dam.
Keywords
Coefficient of river regime; Reference discharges for flow regime analysis; Gini coefficient; Discharge gini coefficient;
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