Ecology and Resilient Infrastructure

Korean Society of Ecology and Infrastructure Engineering (응용생태공학회)
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Comparison of the Effects of Continuous Erosion Control Dams on Benthic Macroinvertebrate Communities Before and After the Rainy Season

연속적인 사방댐이 장마 전·후 저서성 대형무척추동물 군집에 미치는 영향 비교

  • An, Chae Hui (Department of Biological Science, Sangji University) ;
  • Han, Jung Soo (Department of Biological Science, Sangji University) ;
  • Hyun, Jae Bin (Department of Biological Science, Sangji University) ;
  • Choi, Jun Kil (Department of Biological Science, Sangji University) ;
  • Lee, Hwang Goo (Department of Biological Science, Sangji University)
  • Received : 2021.02.09
  • Accepted : 2021.03.08
  • Published : 2021.03.31
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Abstract

This study aimed to investigate changes in benthic macroinvertebrate communities caused by erosion control dams using data obtained from three erosion control dams in Wonju, Gangwon Province, before and after the rainy season. Surveys were conducted four times from March to September 2019, and survey points were continuously selected during the installation of closed-type and open-type dams. A total of eight points from the upstream and downstream regions of each dam type were selected. The flow velocity of both the closed and open types increased, but the closed type exhibited a relatively higher flow velocity than the open type. Benthic macroinvertebrate species and individuals mostly decreased after the rainy season. A relatively large number of species and individuals were found upstream of the closed-type dam. An analysis of the ephemeroptera-plecoptera-trichoptera groups showed relatively reduced ephemeroptera in the closed-type dam and reduced trichoptera in the open-type dam. The periods before and after the rainy season could be divided based on the results of a similarity analysis. The open type showed relatively minimal changes before and after the rainy season.

본 연구는 강원도 원주시에 3개의 사방댐이 연속적으로 설치된 지역을 대상으로 장마 전·후의 자료를 비교·분석하여 사방댐에 의한 저서성 대형무척추동물의 군집 변화를 파악하고자 하였다. 조사시기는 2019년 3월부터 9월까지 총 4회 조사를 실시하였으며, 조사지점은 불투과형이 연속적으로 설치된 지역과 투과형이 연속적으로 설치된 지역을 선정하였다. 불투과형, 투과형 사방댐 각각 상·하류로부터 총 8개의 지점을 선정하였다. 유속은 장마 이후 불투과형, 투과형 모두 대부분의 지점에서 증가하였으나, 불투과형은 투과형보다 상대적으로 유속의 변화가 큰 것으로 확인되었다. 저서성 대형무척추동물의 종수 및 개체수는 장마 이후 대부분의 지점에서 감소하는 것으로 나타났으며, 불투과형 상류지점이 상대적으로 종수 및 개체수가 높은 것으로 나타났다. 하루살이목-강도래목-날도래목 (EPT) 그룹 분석은 상대적으로 불투과형에서 하루살이목이 감소하였으며, 투과형에서 날도래목이 감소하였다. 유사도 분석 결과, 불투과형, 투과형 모두 장마 전·후가 구분되었으며, 투과형이 상대적으로 장마 전·후의 변화가 적은 것으로 분석되었다.

Keywords

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