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2019 Vol.29, Issue 1 Preview Page

Research Article

Suggestion on the Dredging Time of Sediments Behind Debris Barrier Using Rainfall Data

강우자료를 이용한 사방댐 배면 퇴적물의 준설시기 선정

Young-Suk Song1*
,
Minseok Kim2
,
In-Keun Jung3
송 영석1*
,
김 민석2
,
정 인근3
1Geologic Environment Division, Korea Institute of Geoscience and Mineral Resources, Head of Geo-Environmental Hazard Research Center, Principal Researcher
2Geologic Environment Division, Korea Institute of Geoscience and Mineral Resources, Senior Researcher
3KCT E&C., President
1한국지질자원연구원 지질환경연구본부, 지질환경재해연구센터장, 책임연구원
2한국지질자원연구원 지질환경연구본부, 선임연구원
3(주)케이씨티이엔씨, 대표이사
*Corresponding Author
31 March 2019. pp. 13-21
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Abstract

The rainfall intensity-duration curve (I-D curve) was used for selecting the dredging time of sediments behind a debris barrier which is located at the study area in Inje-gun, Kangwon Province. The I-D curve was newly suggested by using the data of rainfall-induced landslides for about 30 years from June to September in Kangwon Province. According to the monitoring results, the landslides have been not occurred during the monitoring period of the dredged sediments management system at the study area, and also all of the rainfall events were located below the I-D curve. The weight of the dredged sediments measured at the management system in the field was increased but the weight increment was small. It means that the increase of the dredged sediments was not the effect of landslide but the effect of soil erosion at the ground surface due to heavy rainfall. The weight of the dredged sediments behind a debris barrier could be known in real time using the rainfall data measured at the management system. Also, when the I-D curve is used with the management system, it is possible to select the optimum dredging time for sediments behind debris barrier.

Keywords
debris barrier
dredged sediments management system
dredging time
I-D curve
rainfall data

준설퇴적물 관리시스템이 설치된 사방댐(강원도 인제군)을 대상으로 강우강도-강우지속시간 한계곡선(I-D curve)을 이용하여 사방댐 배면의 퇴적물에 대한 준설시기를 선정하였다. 강원지역에서 약 30년 동안 6-9월 사이의 집중호우로 발생된 산사태 자료를 이용하여 I-D curve를 제안하였다. 준설관리시스템의 운영기간 동안 연구지역에서는 산사태가 발생되지 않았으며, 모든 강우사상은 I-D curve 아래에 위치하고 있다. 준설퇴적물 관리시스템에 대한 모니터링 결과 준설퇴적물 관리시스템에서 측정된 준설퇴적물 하중은 증가양상을 보였으나 증가량은 적은 것으로 나타났다. 따라서 준설퇴적물의 증가는 산사태에 의한 것이 아니라 집중호우시 산지표층부에서 발생된 일부 토사유실에 의한 것임을 알 수 있다. 준설퇴적물 관리시스템에 설치된 강우자료를 활용하여 사방댐 배면 준설퇴적물의 양을 실시간으로 확인할 수 있으며, 강우 한계곡선(I-D curve)을 함께 활용할 경우 사방댐 배면의 퇴적물에 대한 최적의 준설시기 선정이 가능하게 된다.

키워드
사방댐
준설퇴적물 관리시스템
준설시기
강우강도-강우지속시간 한계곡선
강우자료
References
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Information
  • Publisher :Korean Society of Engineering Geology
  • Publisher(Ko) :대한지질공학회
  • Journal Title :The Journal of Engineering Geology
  • Journal Title(Ko) :지질공학
  • Volume : 29
  • No :1
  • Pages :13-21
  • Received Date : 2019-01-18
  • Revised Date : 2019-03-18
  • Accepted Date : 2019-03-25
  • DOI :https://doi.org/10.9720/kseg.2019.1.013
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