Journal of Korea Water Resources Association (한국수자원학회논문집)

Korea Water Resources Association (한국수자원학회)
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A Study on the Sandbar and Vegetation Area Alteration at the Downstream of Dam

댐 하류하천의 사주와 식생 면적 변화에 관한 연구

  • 박봉진 (한국수자원공사 댐.유역관리처 하천유역팀) ;
  • 장창래 (한국수자원공사 수자원연구원) ;
  • 이삼희 (건설기술연구원, 하천.해안연구실) ;
  • 정관수 (충남대학교 공과대학 토목공학과)
  • Published : 2008.12.31
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Abstract

In this study, area variation, index and degree of alteration, temporal variation of the sandbar and vegetation were analyzed using aerial photographs during the pre and post dam construction at the downstream of dam. Analysis result of the sandbar area was decreased 17 %. Sandbar area was 38 % of the channel areas at the pre dam, but 21 % at the post dam. Alteration indies of the sandbar were $-0.9921{\sim}2.9528$. Analysis result of the vegetation area was increased 13 %. Vegetation area was 11 % of the channel areas at the pre dam, but 24 % at the post dam. Alteration indies of the vegetation were $-0.8908{\sim}12.0736$. Temporal variation of the sandbar and vegetation were analyized at the An Dong dam, Im Ha dam, Hap Chun dam. Analysis result of the sandbar was decreased $42,600m^2$ per year, but vegetation was increased $51,700m^2$ per year. Sandbar area was decreasing more fast than vegetation area increasing.

본 연구는 댐 건설 전 후 항공사진을 활용하여 댐 하류하천의 사주와 식생의 면적변화, 변화지수, 변화정도와 경년변화를 비교 분석 하였다. 사주면적 변화를 분석한 결과, 댐 건설전의 사주면적은 하천면적의 38 %이었으나, 댐 건설후에는 21 %로 17 %가 감소하였으며, 변화지수는 $-0.9921{\sim}2.9528$ 이었다. 식생면적 변화를 분석한 결과, 댐 건설전의 식생면적은 하천면적의 11 %이었으나, 댐 건설후에 24 %로 13 %가 증가하였으며, 변화지수는 $-0.8908{\sim}12.0736$ 이었다. 안동댐, 임하댐, 합천댐의 사주와 식생의 경년변화를 분석한 결과, 사주면적은 연 $42,600m^2$씩 감소 하였으나 식생면적은 연 $51,700m^2$ 씩 증가하여, 사주면적의 감소 보다 식생면적의 증가가 큰 것으로 분석되었다.

Keywords

References

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