Forecasting of flood travel time depending on weir discharge condition using two-dimensional numerical model in the channel

Hae-Kwang Lee; Ji-Hwan Oh; Suk-Hwan Jang; Man-Kyu Song

doi:10.3741/JKWRA.2019.52.6.397

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2019 Vol.52, Issue 6 Preview Page Next Page

Research Article

Forecasting of flood travel time depending on weir discharge condition using two-dimensional numerical model in the channel 2차원 수치모형을 이용한 보 방류조건에 따른 하도 내 홍수도달시간 예측

30 June 2019. pp. 397-409

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Abstract

Gate operation of hydraulic structures is important for proper management in rivers. In this study, the characteristics of flood time were analyzed and predicted using the HEC-RAS model, which is capable of one-dimensional and two-dimensional connectivity analysis of the main points downstream of the Geum river. As a result, flood travel time was decreased once discharge increase and downstream water level rising. However, When the floodplain was overflowed, the arrival time increased due to the rapid increase of the river width. Also, the same condition, flood wave travel time at the major point was approximately twice as fast as water level rising travel time, indicating that waves progressed faster than actually water. Using the results of this study, it will be helpful in the river.

Keywords

Flood wave travel time

HEC-RASver5.0.5

Multi-function weirs

우리나라는 지형적인 특성과 강우 발생 특성에 따라 댐이나 다기능보 등 수리구조물의 수문 운영이 하천의 적절한 관리를 위해 매우 중요하다. 이에 본 연구에서는 홍수도달시간에 대한 이론을 정립하고, 금강하류부의 금강하굿둑〜백제보 구간을 대상으로 1차원과 2차원의 연계해석이 가능한 HEC-RAS 모형을 활용하여 홍수도달시간을 홍수파도달시간과 수위상승도달시간으로 구분하고 보의 방류조건에 따라 홍수도달시간을 분석·예측하고자 한다. 분석 결과, 방류량이 증가하는 시점에 하도를 범람하여 하천 폭의 급격한 증가로 인해 도달시간이 증가하는 형태가 나타났으며, 홍수파 도달시간이 수위상승 도달시간보다 약 2배정도 빠르게 나타나 실제 도달하는 유수의 양보다 수파가 빨리 진행됨을 알 수 있었다. 본 연구결과를 활용한다면, 하천 관리에 도움이 될 것으로 판단된다.

키워드

다기능보

홍수파 도달시간

수위상승 도달시간 HEC-RASver5.0.5

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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 : 52
No :6
Pages :397-409
Received Date : 2019-03-27
Revised Date : 2019-04-25
Accepted Date : 2019-04-25
DOI :https://doi.org/10.3741/JKWRA.2019.52.6.397

Journal of Korea Water Resources AssociationISSN:2799-8746(Print) 2799-8754(Online)한국수자원학회

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