한국수자원학회논문집 (Journal of Korea Water Resources Association)

  • 제41권4호
  • /
  • Pages.395-404
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  • 2008
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  • 2799-8746(pISSN)
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  • 2799-8754(eISSN)
한국수자원학회 (Korea Water Resources Association)
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해평취수장 부근에서 충적하천의 저수로 이동 특성

Lateral Migration Features of the Alluvial Channels in Hapyeong Intake Station, Nakdong River

  • 장창래 (한국수자원공사 수자원연구원) ;
  • 이광만 (한국수자원공사 수자원연구원) ;
  • 김계현 (인하대학교 지형정보공학과)
  • Jang, Chang-Lae (Korea Institute of Water and Environment, Korea Water Resources Corporation) ;
  • Lee, Gang-Man (Korea Institute of Water and Environment, Korea Water Resources Corporation) ;
  • Kim, Gye-Hyun (Deft. of Geoinformatic Engrg., Inha Univ.)
  • 발행 : 2008.04.30
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초록

충적하천의 복잡하고 다양한 이동특성을 파악하고 이해하는 것은 하천공학적으로 매우 중요하며, 본 연구에서는 저수로의 이동 및 하상저하로 인하여 취수문제가 있는 경상북도 구미시에 위치한 해평취수장 주변에 대하여 항공사진 분석을 통하여, 시간에 따른 하천의 지형변화, 저수로의 이동 특성을 조사하고 분석하였다. 저수로는 좌안에서 우안으로 이동해 가고 있으며, 저수로는 강턱유량에 대하여 복렬사주가 발달하는 특성을 보여주고 있다. 이는 하천의 경사가 급하고 하폭이 넓고 수심이 얕은 곳에서 발생하는 현상으로서, 저수로의 불안정성이 증가하기 때문이다. 또한 저수로의 사행도가 감소하면서 저수로 폭이 증가하는 것은 제한된 범위 안에서 저수로의 분류와 합류가 활발하게 발생하는 것을 의미한다. 시간의 증가에 따라 저수로 하폭의 증가율과 측방향 이동율은 감소하고 있다. 강턱유량을 이용하여 중규모 영역구분을 수행한 결과, 복렬사주가 발달하는 하천의 특성을 보여주었으며, 모래하천으로서 부유사가 지배적인 하천으로 판단되었다.

It is important to understand the complex, various migration features of the alluvial channels for river engineering. In this study, the morphological changes and migration features of alluvial channels were investigated by analyzing the aerial photographs of active channels between 1972 and 2004 in Hapyeong Intake Station, Nakdong river. The lower channels were migrated from left bank to right bank and showed the features of braided channel in 2004. The instability of lower channels was increased due to the increased channel slope and width. The sinuosity of lower channels was decreased with time. As time increased, the increasing rate of lower channel and lateral migration rate were decreased. As a result of meso-scale regime analysis by using bankfull discharge, multiple row bars were developed, and suspended sediment load was governed in the flow as a sand bed channel.

키워드

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