Ecology and Resilient Infrastructure

Korean Society of Ecology and Infrastructure Engineering (응용생태공학회)
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A Study on the Formation of River Sandbar and Management of River Forestation & Aggradation - Focusing on the Jang-Hang Wetland on the Han River -

하천의 사주 형성과 하도 수림화 및 육역화 관리방안에 관한 연구 - 한강 장항습지를 중심으로 -

  • Hong Kyu Ahn (Department of Hydro Science and Engineering Research, Korea Institute of Civil Engineering and Building Technology) ;
  • Dong Jin Lee (Department of Hydro Science and Engineering Research, Korea Institute of Civil Engineering and Building Technology)
  • 안홍규 (한국건설기술연구원 수자원하천연구본부) ;
  • 이동진 (한국건설기술연구원 수자원하천연구본부)
  • Received : 2024.05.30
  • Accepted : 2024.06.20
  • Published : 2024.06.30
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Abstract

Recently, most of the rivers in Korea are experiencing various problems in dimension and river environment, such as expansion of stable area where disturbance does not occur during flood, increase of excessive trees in river channel, fixation of river channel, reduction of sand bar. When the soil supplied by the flood is deposited in the river, the plant is settled in the formed terrain, and when another disturbance of the scale that does not erode there occurs after the plant is settled, the river gradually grows and the vegetation zone is formed there. In particular, in terms of river management, river forestation and river aggradation are objects that must be managed because they are disadvantageous in terms of flood control by lowering the flow rate and raising the water level. Therefore, in this study, the area of vegetation occupied by the year of sandbar was analyzed in the process of river aggradation in Jang-Hang wetland. In addition, the correlation between the growth of Jang-Hang wetland was analyzed through the analysis of the flow rate and the flooding frequency that directly affect the growth of Jang-Hang wetland. Through this, the management plan of Jang-Hang wetland, which is registered in Ramsar Wetland but has been river forestation and is undergoing river aggradation, was proposed.

최근 우리나라 대부분의 하천은 사주의 높이 상승 확대로 홍수교란이 미약한 안정역의 확대, 하도내 수목의 과도한 번무와 저수로의 고정화, 모래사주의 감소 등 치수 및 하천환경에서 다양한 문제가 발생하고 있다. 하천은 홍수에 의해서 공급된 토사가 퇴적되어 사주가 만들어지고, 형성된 지형에 식물이 정착하게 되며, 식물이 정착하고 난 후에 그곳이 침식되지 않는 규모의 또 다른 교란이 발생되면 사주는 점차 성장하고 그곳에는 식생대가 형성된다. 특히, 수림화 및 육역화는 하천관리 측면에서 보면, 홍수시 흐름 유속을 저하시키고 수위를 상승시켜 치수적으로 불리한 상황을 만들어 내게 되어 반드시 관리하여야만 하는 대상이 된다. 이에 본 연구에서는 장항습지를 대상으로 하도육역화로 진행되는 과정에서 사주의 경년별 성장과 식생이 차지하는 면적을 분석하였다. 또한 장항습지의 성장에 직접적인 영향을 미치는 유량과 침수빈도 분석을 통하여 장항습지의 성장과의 상관성을 분석하였다. 이를 통하여 람사르습지에 등록되어있지만 수림화 되었고 육역화로 진행중인 장항습지의 올바른 관리방안을 제시하고자 하였다.

Keywords

Acknowledgement

This research was supported by Environmental Fundamental Data Examination project(Connectivity assessment and artificial structures improvement project for improving the health of the Hangang river aquatic ecosystems (2nd Year)) of Hangang River Basin Management Committee.

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