KSCE Journal of Civil and Environmental Engineering Research (대한토목학회논문집)

Korean Society of Civil Engeneers (대한토목학회)
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Two-dimensional Tracer Tests in Natural Rivers Using Radioisotope

방사성 동위원소를 이용한 자연하천의 2차원 추적자 실험

  • 서일원 (서울대학교 공과대학 지구환경시스템공학부) ;
  • 백경오 (한국건설기술연구원) ;
  • 전태명 (대림산업(주) 수자원연구부)
  • Received : 2005.08.05
  • Accepted : 2005.12.21
  • Published : 2006.03.30
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Abstract

A tracer test technique using a radioisotope was proposed to investigate pollutant mixing characteristics in rivers. The main advantages of radioisotope as a tracer in field tests are that it can be detected easily, and that its detection range is quite large. Also, using the radioisotope, the amount sorbed by the bed material and the biota may be a minimum. Field tracer tests were conducted at seven different sites in natural rivers with various meandering pattern. Based on the acquired data, the behavior of the tracer cloud in the intermediate-field was examined two-dimensionally, and dispersion coefficients were calculated using several evaluation methods. Results revealed that the tracer cloud was transported skewed to the outer bank and dispersion coefficients in bends were larger than those in straight reaches.

본 연구에서는 하천에서 오염물의 혼합 특성 연구를 위한 실험 방법으로서 방사성 동위 원소를 이용한 추적자 실험 방법을 제시하였다. 현장 실험시 추적자로서 방사성 동위원소를 사용할 경우 장점은 미량의 주입으로도 추적자의 감지가 용이하며 감지할 수 있는 범위 또한 넓다. 그리고 하상에 흡 탈착되는 추적자의 양이 비교적 작아 정확하면서 효율적으로 실험을 수행할 수 있다. 본 연구에서는 국내 자연하천 중 다양한 사행형태를 갖는 만곡구간을 선정하여 현장조사 및 추적자 실험을 7회 수행하였다. 실험에서 수집된 수리량 및 농도자료로부터 추적자의 2차원적 거동을 분석하고, 다양한 산정법을 통해 종횡 분산계수를 산출하였다. 그 결과 만곡이 심한 구간에서는 추적운의 중심이 만곡의 외측에 치우쳐 이동함을 확인하였고, 종분산계수 및 횡분산계수가 직선구간에 비해 증가함을 확인하였다.

Keywords

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