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Estimation of Optimal Empirical Equations based on Sediments of Ageing Reservoir Estimated Using Autonomous Navigation USV

자율항법 무인측량선을 이용하여 산정된 노후저수지의 퇴사량 기준 최적경험식 산정

  • Won, Chang-Hee (Disaster Prevention Research Division, National Disaster Management Research Institute) ;
  • Yoon, HyeonCheol (Disaster Prevention Research Division, National Disaster Management Research Institute) ;
  • kim, Won-Beom (Disaster Prevention Research Division, National Disaster Management Research Institute)
  • 원창희 (국립재난안전연구원 방재연구실) ;
  • 윤현철 (국립재난안전연구원 방재연구실) ;
  • 김원범 (국립재난안전연구원 방재연구실)
  • Received : 2019.11.21
  • Accepted : 2020.03.06
  • Published : 2020.03.31

Abstract

Acritical function of a nation is to protect its people's lives and properties from natural disasters such as a drought. A drought affects many aspects of human life, including social, economic, and industrial activities. Approximately 75.7% of reservoirs in Korea are over 50 years old.Sedimentation over the years may have caused a situation where storage capacity of the reservoirs is no longer sufficient and compliant with the original reservoir specifications. This study analyzes storage capacities for ten aged reservoirs using the autonomous navigation USV. It compares these capacities with sediment estimated by conventional empirical equations. Comparisons were made to the original specifications for the reservoirs.Storage capacity of six reservoirs decreased in a range between 16.2%-55.3% and storage capacity of 4 reservoirs increased in a range between 1.5%-380.2%. This data was compared to data derived from estimating sediment by empirical equations. Yoon's equation(1982) appeared more accurate than Sur's equation(1988) in Uhlinzi and Yongpo reservoirs, and Sur's equation(1988), however, appeared more accurate than Yoon's equation in Daegok, Ugok2 and Ochi reservoirs. The significant ranges of sedimentation shown in this study suggest that it is worth continuously surveying reservoirs to ensure their efficient management and operation.

가뭄은 한번 발생하면 사회·경제·산업 활동 등 인간의 생활 전반에 걸쳐 영향을 미치게 된다. 이러한 가뭄 등의 자연 재해로부터 국민의 생명과 재산을 보호하는 것은 국가의 중요한 책무이다. 현재 우리나라 저수지의 약 75.7%는 준공 후 50년 이상 경과된 노후 저수지이며, 이로 인한 토사 퇴적 등의 영향으로 제원정보 대비 저수능력이 부족할 수 있다. 따라서 본 연구에서는 자율항법 무인측량선을 활용하여 노후 저수지 10개소에 대해 저수용량을 분석하고, 과거 경험적 공식에 의해 추정된 퇴사량과 비교·분석하였다. 분석 결과 6개 저수지는 제원정보 대비 약 16.2% ~ 55.3%의 저수용량이 감소하였으며, 4개 저수지는 제원정보 대비 약 1.5% ~ 380.2%의 저수용량이 증가하였다. 실제 측량 결과와 경험적 공식에 의한 퇴사량 비교·분석 결과 어린지와 용포 저수지는 유역면적만을 활용한 윤용남 공식(1982), 대곡과 우곡2, 오치 저수지는 유역면적과 유역경계의 총 연장, 유료연장을 매개변수로 활용한 서승덕(1988) 공식이 가장 유사하게 추정되었다. 연구 결과는 저수지 노후화에 따른 퇴적 증감폭과 같이 저수지의 효율적인 운영·관리를 위해서는 지속적인 측량이 필요함을 제안하였다.

Keywords

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