Characteristics of drought-flood abrupt alternation events using SWAP index in the Han River basin

Ho Jun Son; Jin-Young Lee; Jiyoung Yoo; Tae-Woong Kim

doi:10.3741/JKWRA.2021.54.11.925

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2021 Vol.54, Issue 11 Preview Page Next Page

Research Article

Characteristics of drought-flood abrupt alternation events using SWAP index in the Han River basin SWAP 지수를 활용한 한강유역의 가뭄-홍수 급변사상 특성 분석

30 November 2021. pp. 925-932

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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).

Keywords

Drought-flood abrupt alternation events

Precipitation

Severity

Standard weighted average precipitation index

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.

키워드

가뭄-홍수 급변사상

강수량

심각도

표준가중평균강수

References

Dai, A., Trenberth, K.E., and Karl, T.R. (1998). "Global variations in droughts and wet spells: 1900-1995." Geophysical Research Letters, Vol. 25, No. 17, pp. 3367-3370. 10.1029/98GL52511

Kim, H.S., and Im, D.J. (2017) "Implications of water management through dam operation in 2017." Water of Future, Vol. 50, No. 9, pp. 16-23. (in Korean)

Kim, H.S., Kim, H.S., Chun G.I., and Kang, S.U. (2016). "Evaluation of drought in 2014-2015." Water of Future, Vol. 49, No. 7, pp. 61-75. (in Korean)

Lu, E. (2009). "Determining the start, duration, and strength of flood and drought with daily precipitation: Rationale." Geophysical Research Letters, Vol. 36, No. 12, L12707. 10.1029/2009GL038817

Lu, E., Cai, W., Jiang, Z., Zhang, Q., Zhang, C., Higgins, R.W., and Halpert, M.S. (2014). "The day-to-day monitoring of the 2011 severe drought in China." Climate Dynamics. Vol. 43, No. 1-2, pp. 1-9.

Pan, S.H. (2021). Investigating the characteristics of drought-flood abrupt alternation events based on SWAP index in South Korea. M.S. dissertation, University of Hanyang, pp. 1-61.

Shan, L., Zhang, L., Xiong, Z., Chen, X., Chen, S., and Yang, W. (2018). "Spatio-temporal evolution characteristics and prediction of dry-wet abrupt alternation during the summer monsoon in the middle and lower reaches of the Yangtze River basin." Meteorolgy and Atmospheric Pysics, Vol. 130, No. 4, pp. 427-440. 10.1007/s00703-017-0528-7

Soláková, T., De Michele, C., and Vezzoli, R. (2014). "Comparison between parametric and nonparametric approaches for the calculation of two drought indices: SPI and SSI." Jounal of Hydrologic Engineering, Vol. 19, No. 9, 04014010. 10.1061/(ASCE)HE.1943-5584.0000942

Wu, Z., Li, J., He, J., and Jiang, Z. (2006). "Occurrence of droughts and floods during the normal summer monsoons in the mid‐and lower reaches of the Yangtze River." Geophysical Research Letters, Vol. 33, No. 5, L05813. 10.1029/2005GL024487

Xiong, Q., Deng, Y., Zhong, L., Haohua H., and Chen, X. (2018). "Effects of drought-flood abrupt alternation on yield and physiological characteristics of rice" International Journal of Agriculture and Biology, Vol. 20, No. 5, pp. 1107-1116.

Yang, J., Chen, H., Hou, Y., Zhao, Y., Chen, Q., Xu, C., and Chen, J. (2019) "A method to identify the drought-flood transition based on the meteorological drought index." Acta Geographica Sinica, Vol. 74, No. 11, pp. 2358-2370.

Zhao, Y., Weng, Z., Chen, H., and Yang, J. (2020) "Analysis of the evolution of drought, flood, and drought-flood abrupt alternation events under climate change using the daily SWAP index." Water, Vol. 12, No. 7, pp. 1969-1991.

Information

Publisher :KOREA WATER RESOURECES ASSOCIATION
Publisher(Ko) :한국수자원학회
Journal Title :Journal of Korea Water Resources Association
Journal Title(Ko) :한국수자원학회 논문집
Volume : 54
No :11
Pages :925-932
Received Date : 2021-07-23
Revised Date : 2021-10-02
Accepted Date : 2021-10-02
DOI :https://doi.org/10.3741/JKWRA.2021.54.11.925

Journal of Korea Water Resources Association ISSN:2799-8746(Print) 2799-8754(Online) 한국수자원학회 논문집

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