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2024 Vol.57, Issue 12S Preview Page

Research Article

The evaluation of flood protection performance for coastal urban streams under influence of tidal levels

조위 영향을 받는 연안 도시하천의 수방재 성능 평가

Su Hyeok Choia
,
Joo Suk Kob
,
Chaebin Songc
,
Siwan Lyud*
최 수혁a
,
고 주석b
,
송 채빈c
,
류 시완d*
aMaster Course, Department of Civil Engineering, Changwon National University, Changwon, Korea
bResearcher, Institute of Industrial Technology, Changwon National University, Changwon, Korea
cMaster Course, Department of Civil Engineering, Changwon National University, Changwon, Korea
dProfessor, Department of Civil Engineering, Changwon National University, Changwon, Korea
a국립창원대학교 공과대학 토목공학과 석사과정
b국립창원대학교 산업기술연구원 연구원
c국립창원대학교 공과대학 토목공학과 석사과정
d국립창원대학교 공과대학 토목공학과 교수
*Corresponding Author
31 December 2024. pp. 1231-1241
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Abstract

The primary objective of this study is to propose a method to enhance disaster prevention performance targets in coastal urban areas influenced by tidal levels. For this purpose, a hydrologic and hydraulic analysis for external flooding was conducted in the Changwoncheon Basin in Gyeongsangnam-do, South Korea. The HEC-HMS model was used for hydrologic analysis, and the HEC-RAS model was applied for hydraulic analysis to examine the effect of tidal level fluctuations on the rise of flood levels. The study results revealed that an increase in the baseline flood level stage could raise flood levels by up to 29 cm. In the 1.6 km section from the estuary, flood levels were observed to exceed the 200-year flood level frequency at the existing baseline flood level stage, indicating a heightened flood risk in the Changwoncheon Basin. This study particularly emphasizes the need for hydraulic and hydrologic analysis that incorporates tidal levels to improve flood forecasting and disaster prevention performance in coastal cities. However, as this study only addresses external flooding, future research including internal flooding factors in a comprehensive disaster performance evaluation is expected to achieve more meaningful disaster prevention performance targets.

Keywords
Coastal urban stream
Flood protection
Tide level
Flood level

본 연구는 조위 영향을 받는 연안 도시하천의 홍수방어 능력을 평가하는데 주요 목적이 있다. 이를 위해 경상남도 창원시를 관류하는 창원천 유역을 대상으로 외수침수에 대한 수리·수문 분석을 수행하였다. 창원천 유역의 수문분석에는 HEC-HMS 모형을, 수리분석에는 HEC-RAS 모형을 적용하여 조위 변동에 따른 기점수위 상승이 홍수위에 미치는 영향을 검토하였다. 연구 결과, 기점홍수위 단계의 상승이 홍수위를 최대 29cm까지 높일 수 있는 것으로 확인되었다. 하구에서 1.6 km 구간에서는 기존 기준 홍수 수위 단계에서 200년 빈도 홍수 수위를 초과하는 홍수 수위가 산정되어 창원천 유역에서 홍수 위험이 증가하고 있음을 보여준다. 본 연구는 특히 연안 도시의 홍수 예측과 방재성능 강화를 위해 조위를 반영한 수리·수문 분석의 필요성을 강조한다. 다만, 본 연구는 외수침수만을 다루었기에, 추후 내수침수 요소를 포함한 종합적인 방재성능을 평가한다면 더욱 유의미한 방재성능목표 성과를 달성할 수 있을 것으로 기대되는 바이다.

키워드
연안도시하천
수방재
조위
홍수위
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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 :1231-1241
  • Received Date : 2024-10-15
  • Revised Date : 2024-11-28
  • Accepted Date : 2024-12-04
  • DOI :https://doi.org/10.3741/JKWRA.2024.57.S-1.1231
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