A study on the measures to use Gunnam flood control reservoir through a reservoir simulation model

Wonseok Yang; Jaehwang Ahn; Jaeeung Yi

doi:10.3741/JKWRA.2017.50.6.407

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2017 Vol.50, Issue 6 Preview Page Next Page

A study on the measures to use Gunnam flood control reservoir through a reservoir simulation model 저수지 모의 모형을 통한 군남홍수조절지의 활용방안에 관한 연구

30 June 2017. pp. 407-418

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Abstract

Due to geographical features of being close to DPRK (Democratic People’s Republic of Korea), the Imjin River basin has difficulties in hydrological observation, and is vulnerable to unexpected flood occurrence. As a countermeasure, Gunnam Flood Control Reservoir construction was planned in 2005. Despite such a structural measure, damages by DPRK’s illegal release continues to occur. Futhermore the Imjin River’s flow has been decreased due to the effect of continuous drought in the Korean Peninsula since 2012 and DPRK’s unilateral storage of water. A new operation method is derived for the Gunnam Flood Control Reservoir in order to cope with drought damages on the Imjin River basin and to ensure efficient response time upon flooding. The operation method maintaining Gunnam Flood Control Reservoir’s water level by raising from EL.23.0 m to EL.31.0 m during the flood season for securing reservoir capacity enables to secure additional 14,000,000 m3 water compared to the existing operation methods. The operation method to store inflow by controlling release to 250 m3/s in the early stage of flood has increased 2.66% on average in terms of detention effect of reservoir compared to the existing operation methods. The method enables to secure 19 hours to prepare flood compared to the existing methods.

Keywords

Gunnam flood control reservoir

Reservoir operation

HEC-ResSim

Flood control

임진강 유역은 북한과 인접해 있는 지리적 특성 때문에 수문관측에 어려움이 있고 급작스러운 홍수발생 시 대응측면에서 취약하다. 이에 따른 대책으로 2005년 군남홍수조절지 건설이 계획되었다. 그러나 이러한 구조적 대책에도 불구하고 북한의 무단방류에 의한 피해가 계속 발생되고 있고, 2012년부터 지속된 한반도 가뭄의 영향과 북측댐의 일방적인 저수로 임진강 유량이 급격히 감소하여 임진강 하류에서 가뭄 피해가 발생하고 있다. 따라서, 본 연구에서는 임진강유역의 가뭄피해를 대비하고 홍수발생 시 효율적인 대응시간을 확보하기 위하여 군남홍수조절지의 새로운 운영방법을 도출하였다. 먼저 가뭄피해 대비를 위해 저수용량을 확보하는 방안으로서 홍수기 군남홍수조절지 운영수위를 EL.23.0 m에서 EL.31.0 m로 상향하여 유지하는 운영방법은 기존운영방법과 비교․분석 시 약 14백만 m3의 용수를 추가 확보할 수 있다. 또한, 홍수발생 시 초기 250 m3/s로 조절방류를 하여 유입량을 일부 저류시키는 운영방법은 기존운영방법과 비교․분석 시 저수지 저류효과가 평균 2.66% 증가한 것으로 나타났다. 이는 기존의 운영방법과 비교하였을 때 평균 약 19시간의 대응시간 확보가 가능한 것으로 분석되었다.

키워드

군남홍수조절지

저수지운영

HEC-ResSim

홍수조절

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 : 50
No :6
Pages :407-418
Received Date : 2017-02-28
Revised Date : 2017-04-05
Accepted Date : 2017-05-11
DOI :https://doi.org/10.3741/JKWRA.2017.50.6.407

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

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