Journal of Korea Water Resources Association (한국수자원학회논문집)

Korea Water Resources Association (한국수자원학회)
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Flow regime analysis method by using discharge Gini coefficient

유량 지니계수를 이용한 유황분석방안

  • Park, Tae Sun (Department of National Territorial Environment & Resources Research, Korea Research Institute for Human Settlements)
  • 박태선 (국토연구원 국토환경.자원연구본부)
  • Received : 2021.07.06
  • Accepted : 2021.10.20
  • Published : 2021.12.31
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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.

본 연구에서는 연중 일유량의 불균등 정도를 파악하기 위해 "유량 지니계수"라는 새로운 개념의 분석방법을 제시한다. 유량 지니계수는 오름차순한 연중 일유량 발생일자의 누계백분율과 일최빈유량의 오름차순 누계백분율과의 면적관계를 이용하여 산정한다. 유량 지니계수는 0~1 사이의 값으로 표현되며, 불균등의 정도는 5단계로 구분할 수 있다. 유량 지니계수를 이용하면 상류 지점에 대한 하류 지점의 유량 안정도를 산정할 수 있다. 또한, 유황분석 기준유량별로 불균등에 미치는 영향의 정도를 수치적으로 파악할 수 있다. 4대강 본류 상·하류 8개 지점의 장기간 일유량 자료를 이용하여 유량 지니계수의 적용성을 검토하였다. 유량지니계수는 상류 댐에 의한 하류에서의 유량조절 효과를 분석하는 데에도 활용될 수 있을 것이다.

Keywords

Acknowledgement

이 논문은 2020년도 국토연구원의 연구과제(수시 20-04) 중 일부 내용을 수정·보완한 것임.

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