KSCE Journal of Civil and Environmental Engineering Research (대한토목학회논문집)

Korean Society of Civil Engeneers (대한토목학회)
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Development of Axially Periodic Transient Storage Zone Model for the Solute Mixing in Natural Streams and Rivers with Various Bottom Boundaries

하상변화가 있는 자연하천에서의 오염물질 거동해석을 위한 주기적저장대모형 개발

  • 정태성 (한국수자원공사 수자원연구원) ;
  • 서일원 (서울대학교 지구환경시스템공학부)
  • Received : 2006.08.30
  • Accepted : 2006.11.03
  • Published : 2006.11.29
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Abstract

A new model, the periodic transient storage zone model, is developed to describe solute transport mixing in natural streams and rivers with various bottom boundaries. To assess the effects of storage zones structure on transient storage exchange, we analyze data from salt and dye injection experiments in a recirculating laboratory flume with four spatially periodic pool-riffle sequences characteristic of natural river systems under low flow conditions. Dye injections show that solute transport mixing controlled by surface shapes of both the bed and the side in channels. As no existing transient storage model could represent these effects, we developed a new axially periodic transient storage zone model that better represent the effects of channel characteristics in natural river systems. The new model is also fitted to data from salt tracer injection experiments in four reaches of the upper Sabin River, Texas, USA. The proposed model is in good agreement with the field experimental data.

본 연구에서는 하상변화가 존재하는 자연하천에서의 물질거동을 해석하기 위한 주기적저장대모형을 개발하였다. 저장대 구조에 따른 저장효과를 살펴보기 위하여 자연하천의 특성을 고려한 4개의 주기적 여울-소 구조를 갖는 와 흐름에서 소금물과 염료를 이용하여 실험한 모형실험결과를 이용하였다. 염료실험 결과, 물질이동 및 혼합거동은 하상 및 하안의 구조에 영향을 받는 것으로 나타났다. 기존의 저장대분산모형이 주기적으로 변화하는 저장대 구조에 의한 이동 및 질량교환 효과를 정확히 재현하지 못하는 것에 비해서 경계변화에 따른 질량교환 효과를 보다 효과적으로 재현할 수 있는 주기적저장대모형은 모형 실험 결과를 잘 재현하는 것으로 나타났다. 새로운 저장대모형을 미국 텍사스주의 Sabin River에 적용하였으며, 그 결과는 실험을 통해서 수집된 농도분포를 잘 재현하는 것으로 나타났다.

Keywords

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