Journal of Korean Society of Water and Wastewater (상하수도학회지)

The Korean Society of Water and Wastewater (대한상하수도학회)
권호 표지

Experimental Study on the Velocity Structure of 2-D Density Current Induced by Selective Withdrawal

선택취수에 의한 2차원 밀도류의 흐름특성에 관한 실험적 연구

  • Received : 2009.10.26
  • Accepted : 2009.12.10
  • Published : 2009.12.15
Download PDF
⟨ Previous Next ⟩

Abstract

A series of laboratory experiments has been performed to investigate the flow characteristics of 2-dimensional density currents induced by selective withdrawal, which is commonly suggested as a measure for removal of high turbid water from reservoirs. Saltwater has been used to simulate the density stratification over depth and PIV(Particel Image Velocimetry) for observing the velocity structure. Experimental conditions have been established according to Richardson number, which is the dimensionless number that expresses the ratio of potential to kinetic energy. From the experiments, the patterns of longitudinal decay of centerline axial velocity induced by the withdrawal have been distinguished from other experimental cases. The rate of longitudinal decay increase as the Richardson number increases. The variations of volumetric and momentum flux along the longitudinal axis have also shown to be dependent on Richardson number.

Keywords

References

  1. Ahlfeld, D., Joaguin, A., Tobiason, J., and Mas, D.(2003), Case study: Impact of reservoir stratification on interflow travel time, Journal of Hydraulic Engineering,ASCE, Vol. 129, No. 12, pp. 966-975 https://doi.org/10.1061/(ASCE)0733-9429(2003)129:12(966)
  2. Alavian, V.(1986), Behavior of density currents on an incline, Journal of Hydraulic Engineering, ASCE, Vol. 112, No. 1, pp. 27-42 https://doi.org/10.1061/(ASCE)0733-9429(1986)112:1(27)
  3. Baker, J.R., and Paulson. L.J.(1981), Influences of Las Vegas wash density current on nutrient availability and phytoplankton growth in Lake Mead, Proceedings of Symposium on Surface Water Impoundments, ASCE, June 2-5, Minneapolis, Minnesota, pp. 1637-1647
  4. Batuca, D.G. and Jordan, J.M.(2000), Silting and desilting of reservoirs, A.A. Balkema, Rotterdam, Netherlands
  5. Botelbo, D.A, and Imberger, J.(2007), Dissolvedoxygen response to wind-inflow interactions in a stratified reservoir. Limnology and oceanography, Vol. 52, pp. 2027-2052 https://doi.org/10.4319/lo.2007.52.5.2027
  6. Chikita, K. and Okumura, Y.(1990), Dynamics of turbidity currents measured in Katsurazawa reservoir. Hokkaido, Japan. Journal of Hydrology, 117, pp. 323-338 https://doi.org/10.1016/0022-1694(90)90099-J
  7. Chung, S.W., and Gu, R.(1998), Two-dimensional simulations of contaminant currents in stratified reservoir, Journal of Hydraulic Engineering, ASCE Vol. 124, No.7, pp. 704-711 https://doi.org/10.1061/(ASCE)0733-9429(1998)124:7(704)
  8. 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, Inc., New York, N.Y
  9. Ford, D.E. and Johnson, M.C.(1981), Field observations of density current in impoundments, Proceedings of symposium on surface water impoundments, ASCE June 2-5, Minneapolis, Minnesota, pp. 1239-1248
  10. Gu, R., and Chung, S.W.(1998), Reservoir flow sensitivity to inflow and ambient parameters, Journal of Water Resources Planning and Management, Vol. 124,No. 3, pp. 119-128 https://doi.org/10.1061/(ASCE)0733-9496(1998)124:3(119)
  11. Herbbert, B., Imberger, J., and Patterson, J.(1979), Collie river underflow into the Wellington reservoir, Journal of Hydraulics Division, ASCE, Vol. 105, No. 3, pp. 119-128
  12. Johnson, T.R., Ellis, C.R., and Stefan, H.G.(1987), Negatively buoyant flow in a diverging channel. Ⅰ: Flow regimes. Journal of Hydraulic Engineering, ASCE, Vol. 113, No. 6, pp. 716-730 https://doi.org/10.1061/(ASCE)0733-9429(1987)113:6(716)
  13. Johnson, T.R., Ellis, C.R., and Stefan, H.G.(1989), Negatively buoyant flow in a diverging channel. Ⅳ: Entrainment and dilution, Journal of Hydraulic Engineering, ASCE, Vol. 115, No. 4, pp. 437-456 https://doi.org/10.1061/(ASCE)0733-9429(1989)115:4(437)
  14. Steven C. Chapra(1997), Surface water-quality modeling, McGraw-Hill, New york
  15. Umeda, M., Yokohama, K. and Ishikawa, T.(2006), Observation and simulation of floodwater instusion and sedimentation in the Shichikashuku reservoir, Journal of Hydraulic Engineering, ASCE Vol. 132, No.9, pp. 881-891 https://doi.org/10.1061/(ASCE)0733-9429(2006)132:9(881)
  16. Yu, W.S., Hsu, S.M., and Fan, K.L.(2004), Experiments on selective withdrawal of a codirectional two-layer flow through a line sink. Journal of Hydraulic Engineering, ASCE Vol. 130. No.12, pp. 443-461
  17. 김영도(2006), 저수지내 선택취수탑 운영방안 개선을 위한 성층흐름 연구, 한국수자원학회 2005년 분과위원회 연구과업보고회, pp. 47∼75
  18. 손병주(2007), PIV를 활용한 저수지내 선택취수방안에 대한실험적 연구, 석사학위논문, 인제대학교
  19. 신재기, 허진, 이흥수, 백재충, 황순진(2006), 표층수를 방류하는 저수지(용담호)에서 몬순 탁수환경의 공간적 해석, 한국물환경학회지, 22(5), pp. 933-942
  20. 정세웅(2004), 성층화된 저수지로 유입하는 탁류의 공간분포특성 및 연직 2차원 모델링. 대한환경공학회지, 26(9), pp. 970-978
  21. 정세웅, 오정국(2006), 대청호 상류 하천에서 강우시 수온 변동 특성 및 예측 모델 개발, 한국수자원학회, 제39권, 제1호, pp. 79-88
  22. 정세웅, 이흥수, 윤성완, 예령, 이준호, 추창오(2007), 홍수시 대청호 유역에 발생하는 탁수의 물리적 특성, 한국물환경학회지, 23(6), pp. 924-934
  23. 정용락, 류환, 김유경, 예령, 정세웅(2007), 선택취수에 따른 대청호 탁수 조절효과 및 수질영향 분석, , 제40권, 8호, pp. 601-615 https://doi.org/10.3741/JKWRA.2007.40.8.601
  24. 최정우(2002), 임하댐 탁수 차단막 설치효과, 상주대학교자문의견서
  25. 한국수자원공사(2004), 임하댐 탁수저감 방안 수립 보고서, 한국수자원공사