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2024 Vol.57, Issue 12 Preview Page

Research Article

Analysis of rainfall-runoff characteristics of streams in Jeju Island based on observed data

관측자료에 기반한 제주도 하천유역의 강우-유출 특성 분석

Chul-Gyum Kima
,
Jeong Eun Leeb
,
Sunwoo Changc*
김 철겸a
,
이 정은b
,
장 선우c*
aResearch Fellow, Department of Hydro Science and Engineering Research, Korea Institute of Civil Engineering and Building Technology, Goyang, Korea
bSenior Researcher, Department of Hydro Science and Engineering Research, Korea Institute of Civil Engineering and Building Technology, Goyang, Korea
cResearch Fellow, Department of Hydro Science and Engineering Research, Korea Institute of Civil Engineering and Building Technology, Goyang, Korea
a한국건설기술연구원 수자원하천연구본부 연구위원
b한국건설기술연구원 수자원하천연구본부 수석연구원
c한국건설기술연구원 수자원하천연구본부 연구위원
*Corresponding Author
31 December 2024. pp. 1027-1036
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Abstract

In this study, rainfall-runoff data collected from 25 sites across Jeju Island from 2004 to 2014 were analyzed to examine the runoff characteristics of Jeju’s rivers. The results showed that the minimum rainfall required to generate runoff at each site averaged 38.2 mm, with significant variation ranging from 12.6 mm to 72.0 mm depending on the site. Notably, runoff began at rainfall levels above 12.6 mm at the Han-cheon6 site, which is located at a higher altitude, while the Byeongmun-cheon3 site only experienced runoff when rainfall exceeded 72 mm. An analysis of individual runoff events revealed that the Cheonmi-cheon3 site had the highest average runoff rate at 51.2%, while the Gangjeong-cheon2 recorded the lowest at 7.1%. Approximately 43% of all runoff events showed a runoff rate of less than 10%, with a few events even showing rates exceeding 100%. The duration of runoff varied widely, ranging from a minimum of 0.17 hours to a maximum of 214.7 hours, with an average duration of 21.5 hours. About 67.7% of all runoff events concluded within 24 hours. The western drainage sites had relatively shorter runoff durations, while the southern regions, such as the Hyorye-cheon2 and Song-cheon sites, experienced longer durations. Additionally, the runoff rate for each year was calculated based on the total annual rainfall and runoff volume. The annual runoff rates ranged widely, from 0.04% to 120%, with the Geumseong-cheon site recording the highest annual runoff rate of 120% in 2007. Conversely, sites like Gangjeong-cheon2 and Sinheung-cheon recorded extremely low annual runoff rates of less than 2% in some years. The average annual runoff rate across the 25 sites was approximately 14.4%, with the western drainage sites showing relatively lower rates. This study provides a comprehensive understanding of the runoff characteristics of Jeju’s streams. The findings serve as valuable baseline data for future water resource management, flood prediction, and the development of integrated water resource management plans.

Keywords
Jeju Island
Rainfall-runoff
Runoff rate
Duration of runoff

본 연구에서는 2004년부터 2014년까지 제주도 내 25개 지점에서 수집된 강우-유출 자료를 분석하여 제주도 하천의 유출 특성을 분석하였다. 연구 결과, 지점별 유출 발생 최소 강수량은 평균 38.2 mm로 나타났으며, 지점에 따라 12.6 mm에서 72.0 mm까지 큰 차이를 보였다. 특히 고도가 높은 한천6 지점에서는 12.6 mm 이상의 강수량에서 유출이 발생한 반면, 병문천3 지점에서는 72 mm 이상의 강수량에서만 유출이 발생하였다. 유출사상별 분석 결과, 천미천3 지점에서 평균 51.2%로 가장 높은 유출률을 보였고, 강정천2 지점에서는 7.1%로 가장 낮은 유출률을 기록하였다. 전체 유출 사상의 약 43%가 유출률 10% 미만으로 분석되었으며, 유출사상 중 100% 이상의 유출률을 기록한 사상도 일부 관측되었다. 유출 지속시간은 최소 0.17시간에서 최대 214.7시간까지 다양한 범위를 보였으며, 평균 지속시간은 21.5시간으로 나타났다. 전체 유출 사상 중 약 67.7%가 24시간 이내에 종료되었으며, 지점별로는 서부 지역 배수로 지점에서 유출 지속시간이 짧고, 남부 지역의 효례천2 및 송천 지점에서 지속시간이 길었다. 또한 각 연도별로 발생한 강수 총량과 유출 총량을 바탕으로 연도별 유출률을 산정하였다. 연도별 유출률은 0.04%에서 120%까지 매우 다양한 분포를 보였으며, 금성천 지점에서 2007년 유출률이 120%로 가장 높게 나타났다. 반면, 강정천2 및 신흥천 지점 등에서는 일부 연도에 유출률이 2% 미만으로 매우 낮은 값을 기록하였다. 25개 지점의 연평균 유출률은 약 14.4%로 분석되었으며, 서부 지역 배수로 지점들의 연평균 유출률이 상대적으로 낮게 나타났다. 본 연구는 제주도 하천의 유출 특성에 대한 종합적인 이해를 제공하며, 이러한 결과는 향후 수자원 관리 및 홍수 예측, 통합수자원관리 계획 수립 등에 있어 중요한 기초 자료로 활용될 수 있을 것이다.

키워드
제주도
강우-유출
유출률
유출 지속시간
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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 : 57
  • No :12
  • Pages :1027-1036
  • Received Date : 2024-10-14
  • Revised Date : 2024-11-07
  • Accepted Date : 2024-11-11
  • DOI :https://doi.org/10.3741/JKWRA.2024.57.12.1027
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