An experimental study on increased pressure in Shinwol rainwater storage and drainage system by undular bore

Jun Oh Oh; Jae Hyeon Park; Sang Mi Jun

doi:10.3741/JKWRA.2020.53.4.303

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2020 Vol.53, Issue 4 Preview Page Next Page

Research Article

An experimental study on increased pressure in Shinwol rainwater storage and drainage system by undular bore 불규칙 단파에 의한 신월 빗물저류배수시설 내 압력상승에 관한 실험 연구

30 April 2020. pp. 303-312

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Abstract

An underground deep tunnel system is a facility in form of a reverse siphon for an under flood defense structure. In this study, the ‘Shinwol rainwater storage and drainage system’, which is under construction for the first time in South Korea, in order to confirm the effects of undular bore and pressurized air on the hydraulic stability of the facility in various flood scenarios a hydraulic model experiment was performed. As a result of this study, it was analyzed that the undular bore generated downstream pushed the pressurized air collected in the facility while moving upstream, and the pressure inside the pipe increased at this time. It was analyzed that the pressure during the passage of the undular bore was greater than the sum of the static pressure and dynamic pressure at the time and overflow occurred when the cross-sectional size of the pressurized air was more than 40% of the cross sectional area of the tunnel. It is determined that this is correlated with the volume of pressurized air collected in the facility, and it is determined that it is necessary to study the relationship between velocity of undular bore and the volume of pressurized air in the future.

Keywords

Shinwol rainwater storage and drainage system

Undular bore

Increased pressure

지하 대심도 터널은 도시 홍수방어구조물로 역 사이펀 형태의 시설물이다. 본 연구에서는 국내 최초로 건설중인 ‘신월 빗물저류배수시설’을 대상으로 다양한 홍수시나리오에서 불규칙 단파와 압축공기가 시설의 수리적 안정성에 미치는 영향을 확인하기 위하여 수리모형실험을 수행하였다. 본 연구 결과 하류에서 발생한 불규칙 단파가 상류로 이동하면서 시설 내 포집되어 있던 압축공기를 상류로 밀어내고 이 때 관내 압력이 상승하는 것으로 분석되었다. 또한 불규칙 단파가 통과할 때의 압력이 당시 정압력과 동압력의 합보다 큰 것으로 분석되었으며 압축공기 단면의 크기가 터널 단면적의 40% 이상인 경우 월류가 발생하는 것으로 분석되었다. 이는 시설 내 포집되어 있는 압축공기의 부피와 상관이 있는 것으로 판단되며 향후 불규칙 단파 속도와 압축공기 부피와의 관계에 대한 연구가 필요할 것으로 판단된다.

키워드

신월빗물저류배수시설

불규칙 단파

압력상승

References

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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 : 53
No :4
Pages :303-312
Received Date : 2020-02-26
Revised Date : 2020-03-26
Accepted Date : 2020-03-26
DOI :https://doi.org/10.3741/JKWRA.2020.53.4.303

Journal of Korea Water Resources Association ISSN:2799-8746(Print) 2799-8754(Online) 한국수자원학회 논문집

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