Journal of Korea Water Resources Association (한국수자원학회논문집)

Korea Water Resources Association (한국수자원학회)
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Characteristics of drought-flood abrupt alternation events using SWAP index in the Han River basin

SWAP 지수를 활용한 한강유역의 가뭄-홍수 급변사상 특성 분석

  • Son, Ho Jun (Department of Smart City Engineering, Hanyang University) ;
  • Lee, Jin-Young (Rural Research Institute, Korea Rural Community Corporation,) ;
  • Yoo, Jiyoung (Research Institute of Engineering and Technology, Hanyang University) ;
  • Kim, Tae-Woong (Department of Civil and Environmental Engineering/Smart City Engineering, Hanyang University)
  • 손호준 (한양대학교 대학원 스마트시티공학과) ;
  • 이진영 (한국농어촌공사 농어촌연구원) ;
  • 유지영 (한양대학교(ERICA) 공학기술연구소) ;
  • 김태웅 (한양대학교(ERICA) 건설환경공학과/스마트시티공학과)
  • Received : 2021.07.23
  • Accepted : 2021.10.02
  • Published : 2021.11.30
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Abstract

A drought-flood abrupt alternation event is an overlapping extreme event that is harder to cope with than a single event of drought and flood. It is also expected to have a significant adverse impact on ecosystems as well as industries and agriculture. However, there has not yet been a comprehensive study that characterizes the drought-flood abrupt alternation events in Korea. Therefore, this study employed a standard weighted average precipitation (SWAP) index, which is efficient to analyze not only individual events of drought and flood but also the drought-flood abrupt alternation events considering various time scales. The SWAP standardized the weighted average precipitation (WAP) by adding temporal weights to the precipitation. The SWAP indices were calculated for middle-sized watersheds of the Han River basin using the area average precipitation during 1966 and 2018. The severity K was calculated to represent the relative regional severity considering normal rainfalls, and used to characterize the drought-flood abrupt alternation in the study areas. The results indicated that 20 of the 30 middle-sized watersheds in the Han River basin were confirmed to increase the severity of drought-flood abrupt alternation over time. Considering the frequency and severity of drought-flood abrupt alternation events in each watershed, vulnerable areas and dangerous areas due to drought-flood abrupt alternation were identified, for example, the Upstream Namhan River (#1001).

가뭄-홍수 급변사상은 가뭄과 홍수가 중첩된 사상으로, 생태계뿐만 아니라 산업과 농업 그리고 사회경제까지 큰 영향을 미치기 때문에 가뭄이나 홍수의 개별 사상보다 대처하기 어렵다. 하지만 국내의 가뭄-홍수 급변사상에 대한 연구는 부족한 실정이다. 본 연구에서는 표준가중평균강수(SWAP) 지수를 사용하여 가뭄-홍수 급변사상의 특성들을 분석하였다. SWAP 지수는 일강수량에 시간 가중치를 적용한 가중평균강수(WAP) 지수를 표준화 것으로, 한강유역의 중권역별 면적평균강수량(1966-2018년)을 사용해 산정하였다. SWAP 지수는 가뭄·홍수의 단일사상 분석 뿐 아니라 가뭄-홍수 급변사상을 분석하는데 용이하고, 시간의 척도 측면에서도 유연하게 사용할 수 있다. 또한, 심각도 K를 사용해 가뭄-홍수 급변사상의 상대적인 심각도를 지역별로 분석할 수 있다. 연구 결과, 한강유역 30개의 중권역 중 20개의 중권역이 시간이 지남에 따라 가뭄-홍수 급변사상의 심각도가 상승하는 추세가 확인되었고, 중권역별 가뭄-홍수 급변사상의 발생 빈도와 심각도 등을 고려하여 위험지역을 확인할 수 있었다. 예를 들어, 한강유역 내 가뭄-홍수 급변사상으로 인한 위험지역은 남한강상류(#1001) 유역으로 나타났다.

Keywords

Acknowledgement

본 연구는 2021년도 한국연구재단 기초연구사업(NRF-2020R1C1C1014636)의 지원을 받아 수행되었습니다.

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