Korean Journal of Ecology and Environment (생태와환경)

The Korean Society of Limnology (한국수생태학회)
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Changes of River Morphology in the Mid-lower Part of Nakdong River Basin after the 4 Large River Project, South Korea

4대강 사업 후 낙동강 중·하류의 하중도와 제외지 지형변화

  • Im, Ran-Young (Department of Biological Sciences, Pusan National University) ;
  • Kim, Ji Yoon (Department of Biological Sciences, Pusan National University) ;
  • Choi, Jong-Yun (Department of Biological Sciences, Pusan National University) ;
  • Do, Yuno (Department of Biological Sciences, Pusan National University) ;
  • Joo, Gea-Jae (Department of Biological Sciences, Pusan National University)
  • 임란영 (부산대학교 자연과학대학 생명과학과) ;
  • 김지윤 (부산대학교 자연과학대학 생명과학과) ;
  • 최종윤 (부산대학교 자연과학대학 생명과학과) ;
  • 도윤호 (부산대학교 자연과학대학 생명과학과) ;
  • 주기재 (부산대학교 자연과학대학 생명과학과)
  • Received : 2015.03.30
  • Accepted : 2015.07.13
  • Published : 2015.09.30
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Abstract

River channel dredging and riparian development have been influenced morphology and quantity of natural river habitat. We compared distribution of riverside land and alluvial island in the Nakdong River with field survey and remote sensing analysis after the 4 Large River Project in South Korea. We digitized geomorphological elements, includes main channel, riverside land, and alluvial island by using georeferenced aerial photos taken in pre-dredging (2008) and post-dredging (2012) periods. Field survey was followed in 2012 for a ground truth of digitized boundaries and identification of newly constructed wetland types such as pond, channel, branch, and riverine type. We found that during the dredging period, riverside land and alluvial island were lost by 20.2% and 72.7%, respectively. Modification rate of riverside land was higher in the section of river kilometer 50~90, 140~180, and 210~270. Alluvial island had higher change rate in the section of river kilometer 50~70, 190~210, and 270~310. Average change rate for the riverside land and alluvial island was $-1.02{\pm}0.14km^2{\cdot}10km^{-1}$ and $-0.05{\pm}0.05km^2{\cdot}10km^{-1}$, respectively. Channel shaped wetlands (72.5%) constituted large portion of newly constructed wetlands.

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