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Journal of the Korean Society of Hazard Mitigation 2015;15(1):315-326.
Published online February 28, 2015.
도시 중소하천 홍수예경보 발령기준 강우량 선정 타당성 검토 연구
송양호, 박무종, 이정호
Preliminary Feasibility Study on Alert Standard Rainfall for Urban Mid and Small Rivers
Yang Ho Song, Moo Jong Park, Jung Ho Lee
Abstract
For a period of 5 years beginning in May, 2011, the Ministry of Public Safety and Security has, by way of the "Development and Construction of a Flood Forecasting and Warning System for Medium and Small Streams" research project, undertaken research related to medium and small stream flood warning mentioned above as well as the creation of a flood forecasting and warning system. As a part of the project, this study has proposed the criteria for the issuance of medium and small stream flood warnings in urban areas, targeting the Jeongneung stream located in Dongdaemun-gu, Seoul. In order to establish flood warning issuance criteria, analysis was undertaken applying the "Flood Forecasting Estimation Methodology of Standard Rainfall for Urban Mid and Small Rivers considering Upper- and Down-stream Water Levels" scenario put forward by Song et al. (2014) in the case of complex warning criteria estimation methods in line with rising water levels. During the course of research, the HEC-HMS model was applied to the relationship between rainfall-outflow, while analysis of the outflow-water level relationship calculated the standard precipitation amount for the issuance of flood warning in accordance with drainage conditions by constructing the Jeongneung stream basin based on HEC-RAS. The results of calculations took into account the feasibility of criteria for the issuance of flood forecasting and warnings for streams in urban areas through a comparison of real-time water level observations in Jeongneung stream.
Key Words: Flood forecast; Flood warning; Standard rainfall
요지
국민안전처에서는 2011년 5월부터 5개년 계획에 걸쳐 "중소하천 홍수예 경보 체계 구축" 연구사업의 진행사항을 바탕으로 중소하천에서의 홍수예경보와 관련된 연구 및 예경보 시스템 구축을 진행하고 있으며, 이에 일환으로 본 연구에서는 서울시 동대문구 내 위치한 정릉천 유역을 대상으로 도시유역 중소하천 홍수예경보 발령 기준을 제시하였다. 이때 예경보 발령기준을 선정하기 위한 수위상승에 따른 복잡한 발령기준 산정방안의 경우 Song et al. (2014)이 제시한 "상 하류 관측수위 기반 도시 중소하천 홍수예경보 기준 강우량 산정기법"의 시나리오를 적용하여 분석을 실시하였다. 연구진행시 강우-유출 관계의 경우 HEC-HMS 모형을 적용하였으며, 유량-수위의 관계를 통한 분석은 HEC-RAS를 바탕으로 정릉천 유역을 구축함으로써 배수위 조건에 따른 경보발령 기준강우량을 산정하였다. 산정된 결과는 최종적으로 정릉천 내 실시간 수위 관측기록과 비교함으로써 도시유역 중소하천 홍수예경보 발령기준의 타당성을 고려하였다.
핵심용어: 홍수예보; 홍수경보; 기준 강우량


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