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PIV experimental study on the flow characteristics upstream of a floating intake in nonlinear stratified ambient conditions

  • Xueping Gao
  • Qinglin Song
  • Bowen SunEmail author
  • Huifang Song
Original Article
  • 37 Downloads

Abstract

Selective withdrawal is commonly implemented in nonlinearly stratified ambient, which typically has stratified ambient conditions, for purposes of controlling quality. A floating intake is applied as an effective facility of selective withdrawal. However, the outflow dynamics of a floating intake in a nonlinearly stratified ambient have been disregarded, which has a significant effect on the outflow water quality of a reservoir. Experiments were conducted to investigate the effect of thermal stratification on the flow characteristics using particle image velocimetry at three temperature distributions (no stratification, weak stratification and strong stratification). The flow fields upstream of the floating intake showed that the withdrawal layer was formed inhibited by the thermal stratification. And strong stratification produced the thinner withdrawal layer thickness, leading to a larger nonuniform coefficient of the velocity profile. To quantitatively describe the velocity profiles, formulas of dimensionless velocity profiles were proposed. The flow developments were analysed, and the virtual control points located 0.56d above the floating intake (where d is the straight pipe diameter of the floating intake) were obtained. The positions of virtual control points mainly depended on the withdrawal discharge. The decay rate of the velocity along the horizontal line passing through the virtual control point was inversely proportional to the stratification intensity.

Keywords

Floating intake Flow characteristics Nonlinearly stratified ambient Selective withdrawal PIV 

Notes

Acknowledgements

This study was supported by the National Natural Science Foundation of China (51279125), the Science Fund for Creative Research Group of the National Natural Science Foundation of China (51621092) and Tianjin Municipal Natural Science Foundation (15JCYBJC22600).

References

  1. 1.
    Wang S, Qian X, Han BP, Luo LC, Hamilton DP (2012) Effects of local climate and hydrological conditions on the thermal regime of a reservoir at Tropic of Cancer, in southern China. Water Res 46:2591–2604.  https://doi.org/10.1016/j.watres.2012.02.014 CrossRefGoogle Scholar
  2. 2.
    Dallas H (2008) Water temperature and riverine ecosystems: an overview of knowledge and approaches for assessing biotic responses, with special reference to South Africa. Water SA 34:393–404Google Scholar
  3. 3.
    Lin YT, Wu CH (2014) The role of rooted emergent vegetation on periodically thermal-driven flow over a sloping bottom. Environ Fluid Mech 14:1303–1334.  https://doi.org/10.1007/s10652-014-9336-5 CrossRefGoogle Scholar
  4. 4.
    Lin YT (2015) Wind effect on diurnal thermally driven flow in vegetated nearshore of a lake. Environ Fluid Mech 15:1–18.  https://doi.org/10.1007/s10652-014-9368-x CrossRefGoogle Scholar
  5. 5.
    Zouabi-Aloui B, Adelana SM, Gueddari M (2015) Effects of selective withdrawal on hydrodynamics and water quality of a thermally stratified reservoir in the southern side of the Mediterranean Sea: a simulation approach. Environ Monit Assess 187:1–19.  https://doi.org/10.1007/s10661-015-4509-3 CrossRefGoogle Scholar
  6. 6.
    Ma WX, Huang TL, Li X (2015) Study of the application of the water-lifting aerators to improve the water quality of a stratified, eutrophicated reservoir. Ecol Eng 83:281–290.  https://doi.org/10.1016/j.ecoleng.2015.06.022 CrossRefGoogle Scholar
  7. 7.
    Chamoun S, De GC, Schleiss AJ (2017) Management of turbidity current venting in reservoirs under different bed slopes. J Environ Manag 204:519–530.  https://doi.org/10.1016/j.jenvman.2017.09.030 CrossRefGoogle Scholar
  8. 8.
    Zhang Y, Wu Z, Liu M, He J, Shi K, Zhou Y, Wang M, Liu X (2015) Dissolved oxygen stratification and response to thermal structure and long-term climate change in a large and deep subtropical reservoir (Lake Qiandaohu, China). Water Res 75:249–258.  https://doi.org/10.1016/j.watres.2015.02.052 CrossRefGoogle Scholar
  9. 9.
    Gelda RK, Effler SW (2007) Simulation of operations and water quality performance of reservoir multilevel intake configurations. J Water Res Plan Manag 133:78–86.  https://doi.org/10.1061//ASCE/0733-9496/2007/133:1/78 CrossRefGoogle Scholar
  10. 10.
    Shammaa Y, Zhu DZ (2010) Experimental study on selective withdrawal in a two-layer reservoir using a temperature-control curtain. J Hydraul Eng 136:234–246.  https://doi.org/10.1061/(ASCE)HY.1943-7900.0000165 CrossRefGoogle Scholar
  11. 11.
    Çalışkan A, Elçi Ş (2009) Effects of selective withdrawal on hydrodynamics of a stratified reservoir. Water Resour Manag 23:1257–1273.  https://doi.org/10.1007/s11269-008-9325-x CrossRefGoogle Scholar
  12. 12.
    Anohin VV, Imberger J, Asce M, Romero JR, Ivey GN (2006) Effect of long internal waves on the quality of water withdrawn from a stratified reservoir. J Hydraul Eng 132:1134–1145.  https://doi.org/10.1061/(ASCE)0733-9429(2006)132:11(1134) CrossRefGoogle Scholar
  13. 13.
    Deng Y, Tuo Y, Li J, Li K, Li R (2011) Spatial-temporal effects of temperature control device of stoplog intake for Jinping I hydropower station. Sci China Technol Sci 54:83–88.  https://doi.org/10.1007/s11431-011-4602-y CrossRefGoogle Scholar
  14. 14.
    Sherman B (2000) Scoping options for mitigating cold water discharges from dams. Consultancy Report, CSIRO Land and Water, CanberraGoogle Scholar
  15. 15.
    Weber M, Rinke K, Hipsey MR, Boehrer B (2017) Optimizing withdrawal from drinking water reservoirs to reduce downstream temperature pollution and reservoir hypoxia. J Environ Manag 197:96–105.  https://doi.org/10.1016/j.jenvman.2017.03.020 CrossRefGoogle Scholar
  16. 16.
    He W, Lian J, Ma C, Wu M, Liu F, He W, Lian J, Ma C, Wu M, Liu F (2017) Analysis of the thrust force on the temperature-control curtain in a large stratified reservoir. J Hydraul Eng 143:04017049.  https://doi.org/10.1061/(ASCE)HY.1943-7900.0001378 CrossRefGoogle Scholar
  17. 17.
    Kunz MJ, Senn DB, Wehrli B, Mwelwa EM, Wüest A (2013) Optimizing turbine withdrawal from a tropical reservoir for improved water quality in downstream wetlands. Water Resour Res 49:5570–5584.  https://doi.org/10.1002/wrcr.20358 CrossRefGoogle Scholar
  18. 18.
    Yıldırım N, Kocabaş F, GüLcan SC (2000) Flow-boundary effects on critical submergence of intake pipe. J Hydraul Eng 126:288–297CrossRefGoogle Scholar
  19. 19.
    Kocabaş F, Yildirim N (2002) Effect of circulation on critical submergence of an intake pipe. J Hydraul Res 40:741–752.  https://doi.org/10.1080/00221680209499920 CrossRefGoogle Scholar
  20. 20.
    Yang J, Liu T, Bottacin-Busolin A, Lin C (2014) Effects of intake-entrance profiles on free-surface vortices. J Hydraul Res 52:523–531.  https://doi.org/10.1080/00221686.2014.905504 CrossRefGoogle Scholar
  21. 21.
    Azimi AH, Cai J, Zhu DZ, Rajaratnam N (2017) Experimental and numerical investigations on withdrawal of water-capped viscoplastic fluid. J Fluids Eng.  https://doi.org/10.1115/1.4036267 Google Scholar
  22. 22.
    Lu J, Wei Z, Xian G (2013) Extensive selective withdrawal theory and verification using CFD simulation. Eng Appl Comput Fluid Mech 7:433–440.  https://doi.org/10.1080/19942060.2013.11015483 Google Scholar
  23. 23.
    Gao X, Zhang H, Liu J, Sun B, Tian Y (2018) Numerical investigation of flow in a vertical pipe inlet/outlet with a horizontal anti-vortex plate: effect of diversion orifices height and divergence angle. Eng Appl Comput Fluid Mech 12:182–194.  https://doi.org/10.1080/19942060.2017.1387608 Google Scholar
  24. 24.
    Islam MR, Zhu DZ (2015) Selective withdrawal of two-layer stratified flows with a point sink. J Hydraul Eng 141:04015009.  https://doi.org/10.1061/(ASCE)HY.1943-7900.0001007 CrossRefGoogle Scholar
  25. 25.
    Jamali M, Haddadzadegan H (2010) Effects of a sill on selective withdrawal through a point sink in a linearly stratified fluid. Adv Water Resour 33:1517–1523.  https://doi.org/10.1016/j.advwatres.2010.08.009 CrossRefGoogle Scholar
  26. 26.
    Gao X, Li G, Han Y (2014) Effect of flow rate of side-type orifice intake on withdrawn water temperature. Sci World J 2014:1–7.  https://doi.org/10.1155/2014/979140 Google Scholar
  27. 27.
    Yih CS (1958) On the flow of a stratified fluid. In: Proceedings of the 3rd U.S. national congress of applied mechanics, New York, pp 857–861Google Scholar
  28. 28.
    Craya A (1949) Recherches théoriques sur l’écoulement de couches superposées de fluides de densités différentes. La Houille Blanche 35:44–55CrossRefGoogle Scholar
  29. 29.
    Gariel P (1949) Recherches expérimentales sur l’écoulement de couches superposées de fluides de densités différentes. La Houille Blanche 35:56–64Google Scholar
  30. 30.
    Gao X, Tian Y, Sun B, Gao X, Tian Y, Sun B (2018) Multi-objective optimization design of bidirectional flow passage components using RSM and NSGA II: a case study of inlet/outlet diffusion segment in pumped storage power station. Renew Energy 115:999–1013.  https://doi.org/10.1016/j.renene.2017.09.011 CrossRefGoogle Scholar
  31. 31.
    Lazar E, Deblauw B, Glumac N, Dutton C, Elliott G (2010) A practical approach to PIV uncertainty analysis. In: Aiaa aerodynamic measurement technology & ground testing conferenceGoogle Scholar
  32. 32.
    Cui PY, Li Z, Tao WQ (2016) Wind-tunnel measurements for thermal effects on the air flow and pollutant dispersion through different scale urban areas. Build Environ 97:137–151.  https://doi.org/10.1016/j.buildenv.2015.12.010 CrossRefGoogle Scholar
  33. 33.
    Westerweel J (1997) Fundamentals of digital particle image velocimetry. Meas Sci Technol 8:1379CrossRefGoogle Scholar
  34. 34.
    Bryant DB, Khan AA, Aziz NM (2008) Investigation of flow upstream of orifices. J Hydraul Eng 134:98–104.  https://doi.org/10.1061/(ASCE)0733-9429(2008)134:1(98) CrossRefGoogle Scholar
  35. 35.
    Ivey G, Blake S (1985) Axisymmetric withdrawal and inflow in a density-stratified container. J Fluid Mech 161:115–137CrossRefGoogle Scholar
  36. 36.
    Chen H, Gao X (2014) Effect of reservoir thermal stratification on velocity distribution near water intake. J Hydroelectr Eng 33:105–110 (in Chinese) Google Scholar
  37. 37.
    Fischer HB, List EJ, Koh RCY, Imberger R, Brooks NH (1979) Mixing in inland and coastal waters. Elsevier, New YorkGoogle Scholar
  38. 38.
    Cai J, Azimi A, Zhu D, Rajaratnam N (2016) Experimental and numerical studies on pumping viscoplastic fluids. Can J Civ Eng 43:675–684.  https://doi.org/10.1139/cjce-2015-0500 CrossRefGoogle Scholar
  39. 39.
    Zhou J, Venayagamoorthy SK (2016) Numerical simulations of intrusive gravity currents interacting with a bottom-mounted obstacle in a continuously stratified ambient. Environ Fluid Mech 17:1–19.  https://doi.org/10.1007/s10652-016-9454-3 Google Scholar
  40. 40.
    He Z, Zhao L, Lin T, Hu P, Lv Y, Ho H-C, Lin Y-T (2016) Hydrodynamics of gravity currents down a ramp in linearly stratified environments. J Hydraul Eng 143:04016085.  https://doi.org/10.1061/(asce)hy.1943-7900.0001242 CrossRefGoogle Scholar
  41. 41.
    Longo S, Ungarish M, Federico VD, Chiapponi L, Addona F (2016) Gravity currents in a linearly stratified ambient fluid created by lock release and influx in semi-circular and rectangular channels. Phys Fluids 28:096602.  https://doi.org/10.1063/1.4963009 CrossRefGoogle Scholar
  42. 42.
    Kerimoglu O, Rinke K (2013) Stratification dynamics in a shallow reservoir under different hydro-meteorological scenarios and operational strategies. Water Resour Res 49:7518–7527.  https://doi.org/10.1002/2013WR013520 CrossRefGoogle Scholar
  43. 43.
    He W, Lian J, Yao Y, Wu M, Ma C (2017) Modeling the effect of temperature-control curtain on the thermal structure in a deep stratified reservoir. J Environ Manag 202:106–116.  https://doi.org/10.1016/j.jenvman.2017.07.006 CrossRefGoogle Scholar

Copyright information

© Springer Nature B.V. 2019

Authors and Affiliations

  • Xueping Gao
    • 1
  • Qinglin Song
    • 1
  • Bowen Sun
    • 1
    Email author
  • Huifang Song
    • 1
  1. 1.State Key Laboratory of Hydraulic Engineering Simulation and SafetyTianjin UniversityTianjinChina

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