대한토목학회논문집 (KSCE Journal of Civil and Environmental Engineering Research)

  • 제39권6호
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  • Pages.725-733
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  • 2019
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  • 1015-6348(pISSN)
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  • 2799-9629(eISSN)
대한토목학회 (Korean Society of Civil Engeneers)
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춘천 서상리 계곡부 샌드댐 설치를 위한 수문학적 예비 설계

Preliminary Hydrological Design for Sand Dam Installation at the Valley of Seosang-ri, Chuncheon

  • 정일문 (한국건설기술연구원 국토보전연구본부) ;
  • 이정우 (한국건설기술연구원 국토보전연구본부)
  • Chung, Il-Moon (Korea Institute of Civil Engineering and Building Technology) ;
  • Lee, Jeongwoo (Korea Institute of Civil Engineering and Building Technology)
  • 투고 : 2019.10.10
  • 심사 : 2019.10.30
  • 발행 : 2019.12.01
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초록

샌드댐(Sand dam)은 계곡하천을 가로지르는 보에 의해 모래가 쌓이고 그 공극속으로 계곡수가 저장되어 수위가 높아지면서 가뭄때 보조 수자원으로 활용토록 하는 구조물이다. 주로 아프리카 지역 등 건조지역에서 활용되는 이 구조물은 우리나라에는 설치된 사례가 없으며 계곡토석류를 방지하는 일부 사방댐에서 취수를 하는 경우는 찾아볼 수 있다. 본 연구에서는 춘천 서상리 계곡부를 대상으로 기존 취수보 하류부에 샌드댐을 설치하였을 때 물공급 효과를 평가하고자 한다. 이를 위해 유역수문모형과 저수지 추적 모형을 연계한 모델링을 수행하였으며 샌드댐의 규모와 취수량 등에 따른 댐체 내의 수위, 저류량, 방류량의 변화를 케이스별로 제시하였다. 적용 결과 샌드댐 설치로 인한 물공급 능력이 95% 신뢰도에서 제고되는 것을 알 수 있었다. 특히 하루 50톤의 물공급을 목표로 하였을 경우 L × B × Ho = 25 m × 15 m × 1 m 규모로 설치하고, 상류 취수보와 하류 샌드댐 취수량을 (Q1, Q2) = (30, 20), (35, 15) ㎥/day로 운영할 때가 가장 효율적인 것으로 나타났다.

Sand dams are structures that can be used as auxiliary water resources in case of drought as sand accumulates due to barriers crossing valley rivers and valley water is stored in the voids, increasing the water level. This structure, which is mainly used in arid regions such as Africa, has not been installed in Korea. In Korea, there are only a few cases where water is taken from debris barriers that prevent debris flow. The purpose of this study is to evaluate the effect of water supply when the sand dam is installed downstream of the existing intake barrier in Seosang-ri valley, Chuncheon. For this purpose, modeling was performed by linking the basin hydrologic model and reservoir routing model. Changes in the water level, storage and discharge in the sand dam reservoir according to the size and intake of the sand dam are presented on a case-by-case basis. As a result of application, it was found that the water supply capacity due to the sand dam installation was improved at 95% reliability. Especially, when the size is L × B × Ho = 25 m × 15 m × 1 m and the pumping rates from intake barrier and sand dam are (Q1, Q2) = (30, 20), (35, 15) ㎥/day, the efficiency was the best for water supply of 50 ㎥/day.

키워드

참고문헌

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