DOI QR코드

DOI QR Code

사행하천에서 횡혼합에 관한 추적자 실험

Tracer Tests on Transverse Mixing in Meandering Streams

  • 서일원 (서울대학교 지구환경시스템공학부) ;
  • 백경오 (서울대학교 지구환경시스템공학부) ;
  • 전태명 (서울대학교 지구환경시스템공학부) ;
  • 진준하 (한국원자력연구소)
  • 발행 : 2003.08.01

초록

사행이 있는 자연하천에서 횡혼합 특성을 분석하고 종ㆍ횡분산게수를 산정하기 위해 현장실험을 실시하였다. 이를 위해 남한강 지류인 섬강 및 청미천에서 사행구간을 선정하여 유속과 수심 측정 및 추적자실험을 수행하였다. 추적자로서는 미량으로도 관측이 용이한 방사성 동위원소를 사용하였으며 주입은 순간. 점주입 조건을 바랐다. 이를 통해 취득된 수리량 및 농도 자료를 이용하여 종ㆍ횡분산계수를 산정하였고, 이들을 기존의 추정식에 의한 결과와 비교, 분석하였다. 종분산계수는 해석해를 통해 산정하였는데 섬강은 약0.5 $m^2$/s, 청미천은 0.2 $m^2$/s 로 산정되었다. 횡분산계수는 해석해 및 모멘트방법을 이용하여 산정하였는데, 섬강은 약 0.01-0.06 $m^2$/s의 범위를 가지며 청미천은 약 0.0l-0.05 $m^2$/s의 범위를 갖는 것으로 산정되었다.

Field tests were conducted to investigate characteristics of the transverse mixing and to evaluate the dispersion coefficients in the meandering natural streams. The Sum River and the Cheong-mi Creek, tributaries of Han River, were selected as the test site, and measurements of the hydraulic and dispersion data were performed. In the tracer tests, the radioisotope was used as a tracer and injected into a flow on the instantaneous point source. Using the measured data, the longitudinal and transverse dispersion coefficients were evaluated and compared with the previous studies. The longitudinal dispersion coefficients, which were evaluated by application of the analytical solution, were about 0.5 $m^2$/s at the Sum River and 0.2 $m^2$/s at the Cheong -mi Creek. The transverse dispersion coefficients, which were evaluated by the analytical solution and the moment method, were ranging from 0.01 to 0.06 $m^2$/s for the Sum River and from 0.01 to 0.05 $m^2$/s for the Cheong-mi Creek.

키워드

참고문헌

  1. 서일원, 백경오, 이두한, 진준하 (2002). '자연하천에서 횡혼합에 관한 실험적 연구.' 대한토목학회 학술발표회 논문집, 대한토목학회, CD-ROM(수공), pp.554-557
  2. Beltaos, S.(1975). 'Evaluation of transverse mixing coefficients from slug tests.' J. of Hydr. res., Vol.13, No.4, IAHR, pp.351-360 https://doi.org/10.1080/00221687509499693
  3. Beltaos, S.(1980). 'Transverse mixing tests in natural streams.' J. of Hydr. Div. ASCE, Vol.106, No.10, pp.1607-1625
  4. Demetracopoulos, A.C., and Stefan, H.G.(1983). 'Transverse mixing in wide and shallow River: case study.' J. of Envir. Engrg., Vol.109, No.3, pp.685-699 https://doi.org/10.1061/(ASCE)0733-9372(1983)109:3(685)
  5. Elder, J.W.(1959). 'The dispersion of marketd fluid in turbulent shear flow.' J. Fluid Mech., Vol.5, No.4, pp.544-560 https://doi.org/10.1017/S0022112059000374
  6. Fischer, H.B., List, E.J., Koh, R.C.Y., Imberger, J., and Brooks,N.H.(1979). Mixing in inland and coastal waters, Academic Press, New York
  7. Glover, R.E.(1964). Dispersion of dissolved or suspended materials in flowing streams, Professional Paper No. 433-B, U. S. Geological Survey, Washington
  8. Godfrey, R.G., and Fredrick, B.J.(1970). Stream dispersion at selected sites, Professional Paper No. 433-K, U. S. Geological Survey, Washington
  9. Holley, E.R., and Abraham, G.(1973b). 'Field tests on transverse mixing in rivers.' J. of Hydr. Div. ASCE, Vol.99, No.HY12, pp.2313-2331
  10. Lau, Y.L., and Krishnappan, B.G.(1981). 'Modeling transverse mixing in natural streams.' J. of Hydr. Div. ASCE, Vol.107, No.HY2, pp.209-226
  11. McQuivery, R.S., and Keefer, T.N.(1976). 'Dispersion-Mississippi River below Baton Rouge, LA.' J. of Hydr. Div. ASCE, Vol.102, No.HY10, pp.1425-143
  12. Sayre, W.W., and Chang, F.M.(1968). A laboratory investigation of open channel dispersion processes for dissolved, suspended, and floating dispersants, Professional Paper No. 433-E, U.S. Geological Survey, Washington
  13. Sayre, W.W.;Yeh, T.(1979). Transverse mixing characteristics of the Missouri River downstream from the Cooper nuclear station, ⅡHR Report No. 145, Univ, of Iowa, Iowa City, Iowa
  14. Sayre, W.W.(1979). 'Shore-attached thermal plumes in rivers.' Modelling in Rivers, Wiley-Interscience, London