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2025 Vol.58, Issue 8 Preview Page

Research Article / 우수학생논문상

Data-driven analysis of flood response capacity and upstream effects of pre-drainage: a case study in the West Nakdong River

사전배수에 따른 하구부 하천 홍수 대응능력 및 상류 영향에 대한 자료 기반 분석: 서낙동강을 중심으로

Sungdo Junga
,
Seon Woo Namb
,
Yoonseok Kimc
,
Minseok Kimd*
정 성도a
,
남 선우b
,
김 윤석c
,
김 민석d*
aMaster’s Student, Department of Civil Engineering, Pusan National University, Busan, Korea
bMaster’s Student, Department of Civil Engineering, Pusan National University, Busan, Korea
cMaster’s Student, Department of Civil Engineering, Pusan National University, Busan, Korea
dAssistant Professor, Department of Civil Engineering, Pusan National University, Busan, Korea
a부산대학교 사회기반시스템공학과 석사과정
b부산대학교 사회기반시스템공학과 석사과정
c부산대학교 사회기반시스템공학과 석사과정
d부산대학교 사회기반시스템공학과 조교수
*Corresponding Author
31 August 2025. pp. 707-719
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Abstract

This study presents a data-based method to assess the effects of pre-drainage on flood response capacity and upstream conditions, and applies it to the Noksan drainage pumping station located in the estuarine section of the West Nakdong River. The analysis of upstream effects focused on inflow from upstream induced by pumping and on surface water-groundwater interactions. For the assessment of flood response capacity, records of water level, rainfall, and pumping discharge were integrated to empirically approximate the relationship between rainfall amount and potential water level rise, with a 95% prediction interval estimated to represent associated uncertainty. The analysis indicated that, for a cumulative rainfall of approximately 150 mm, there is a 97.5% probability that the maximum capacity secured through pre-drainage would be sufficient to prevent inundation. Inflow rate from upstream, caused by water level drawdown during pumping, was estimated to account for 11-17% of the total pumping rate, constituting a factor that could reduce pumping efficiency. The analysis of surface water-groundwater interactions confirmed hydraulic connectivity between the West Nakdong River and the surrounding aquifer, and revealed that pre-drainage could temporarily convert the river from a losing stream to a gaining stream. These findings suggest that the effects of artificial water level drawdown may occur over a spatially extensive area, with potential implications not only for surface water quantity but also for the quality of both surface water and groundwater, as well as for aquatic ecosystems.

Keywords
Data-based
Pre-drainage
Flood response capacity
Surface water-groundwater interaction

본 연구는 사전배수가 홍수 대응 및 상류 구간에 미치는 영향을 관측 자료를 기반으로 검토하는 방법을 제시하고, 이를 서낙동강 하구부에 위치한 녹산배수펌프장에 적용하였다. 상류 영향 분석에서는 펌프토출에 따른 상류유입과 표면수-지하수 상호작용을 중점적으로 살펴보았다. 홍수 대응능력 평가에서는 수위, 강우, 펌프토출량 기록을 종합하여 누적강우량과 잠재수위증가량의 관계를 자료 기반으로 근사하고, 95% 예측구간을 산정하여 불확실성을 함께 제시하였다. 분석 결과, 누적강우량이 약 150 mm일 때 97.5%의 확률로 사전배수로 확보한 최대 용량이 침수 방지에 충분한 것으로 나타났다. 펌프토출로 인한 수위 저하에 따라 상류로부터 유입되는 유량은 토출량의 11~17%로 산정되었으며, 이는 배수 효율을 저하시키는 요인으로 확인되었다. 또한, 표면수-지하수 상호작용 분석 결과, 서낙동강과 주변 대수층 간의 수리학적 연결성이 확인되었고, 사전배수 시 서낙동강이 일시적으로 손실하천에서 유입하천으로 전환될 가능성이 관찰되었다. 이는 인위적인 수위저감의 영향이 광범위하게 나타날 수 있음을 의미하며, 지표수 및 지하수의 수량뿐만 아니라 수질과 생태계에도 잠재적인 영향을 미칠 수 있음을 시사한다.

키워드
자료 기반
사전배수
홍수 대응능력
지표수-지하수 상호작용
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Information
  • Publisher :KOREA WATER RESOURECES ASSOCIATION
  • Publisher(Ko) :한국수자원학회
  • Journal Title :Journal of Korea Water Resources Association
  • Journal Title(Ko) :한국수자원학회 논문집
  • Volume : 58
  • No :8
  • Pages :707-719
  • Received Date : 2025-08-10
  • Accepted Date : 2025-08-12
  • DOI :https://doi.org/10.3741/JKWRA.2025.58.8.707
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