Abstract
The exchange of dissolved matter between a straight open channel and a series of shallow embayments present at one of its sides is investigated using large eddy simulation (LES). The direct link between the mechanism of mass exchange and the dynamics of coherent structures is demonstrated. It is shown that for the geometrical configuration considered in the present study, the mass exchange process is very non-uniform over the depth in the vicinity of the channel–embayment interface. Most of the contaminant is ejected from the embayments close to the free surface. The amount of contaminant re-entrained into the embayments situated downstream of the one in which contaminant was introduced is quantified. The mass exchange coefficient predicted by LES does not vary significantly with the embayment rank and is in very good agreement with the one predicted by the model proposed by Weitbrecht et al. (J Hydraul Eng 134(2):173–183, 2008) based on the value of a dimensionless morphometric groyne-field parameter. Field experiments were purposely performed in a natural stream with embayments whose length over width ratios were close to the ratio in the LES study. The concentration fields predicted by LES are compared with video-records of colored dye used to visualize the mass exchange in the field experiment. It is shown that, for both LES and the field experiment, the dominant passage frequency of the eddies inside the interfacial mixing layer is well predicted by the analytical model of Sukhodolov and Sukhodolova (in: Cowen et al (eds) Hydraulic measurements & experimental methods. Proceedings of international conference, Lake Placid, USA, pp 172–177, 2007). The model is then used to scale the time in the LES animations and field video-records showing the temporal evolution of the concentration field. The results of the comparison indicate several similarities in the mixing process, despite the differences in the bathymetry and the large difference in the Reynolds number between LES and the field experiment. This proves the usefulness of performing detailed LES and laboratory studies in well-controlled environments to understand mass-exchange processes around river groyne fields.
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References
Abad JD, Rhoads BL, Guneralp I, Garcia MH (2008) Flow structure at different stages in a meander bend with bendway weirs. J Hydraul Eng 134(8): 1052–1063
Brevis W, Nino J, Weitbrecht V, Jirka GH (2008) On the flow dynamics and coherent structures in submerged groyne fields. In: Altinakar, Kopkinar, Aydin, Cokgor, Kirkgoz (eds) Proceedings of the river flow 2008 conference, Cesme, Turkey, September 2008, pp 893–902
Chang KS, Constantinescu SG, Park S (2006) Analysis of the flow and mass transfer process for the incompressible flow past an open cavity with a laminar and a fully turbulent incoming boundary layer. J Fluid Mech 561: 113–145
Chang KS, Constantinescu SG, Park S (2007) The purging of a neutrally buoyant or a dense miscible contaminant from a rectangular cavity. Part II: The case of an incoming fully turbulent overflow. J Hydraul Eng 133(4): 373–385
Chang K, Constantinescu G, Park SO (2007) Assessment of predictive capabilities of detached eddy simulation to simulate flow and mass transport past open cavities. ASME J Fluids Eng 129(11): 1372–1383
Englehardt C, Kruger A, Sukhodolov A, Nicklisch A (2004) A study of phytoplankton spatial distributions, flow structure and characteristics of mixing in a river reach with groynes. J Plankton Res 26(11): 1351–1366
Hinterberger C (2004) Three-dimensional and depth-average large eddy simulation of shallow water flows. Ph.D. Dissertation, Karlsruhe University, Karlsruhe, Germany
Hinterberger C, Frohlich J, Rodi W (2007) Three-dimensional and depth-averaged large eddy simulations of some shallow water flows. J Hydraul Eng 133(8): 857–872
Kirkil G, Constantinescu G (2009) Nature of flow and turbulence structure around an instream vertical plate in a shallow channel and the implications for sediment erosion. Water Resources Research 45:W06412. doi:10.1029/2008WR007363
Kirkil G, Constantinescu SG, Ettema R (2008) Coherent structures in the flow field around a circular cylinder with scour hole. ASCE J Hydraul Engrg 134(5): 572–587
Koken M, Constantinescu G (2008) An investigation of the flow and scour mechanisms around isolated spur dikes in a shallow open channel. Part I. Conditions corresponding to the initiation of the erosion and deposition process. Water Resour Res 44:W08406. doi:10.1029/2007WR006489
Koken M, Constantinescu G (2008) An investigation of the flow and scour mechanisms around isolated spur dikes in a shallow open channel. Part II. Conditions corresponding to the final stages of the erosion and deposition process. Water Resources Research 44:W08407. doi:10.1029/2007WR006491
Koken M, Constantinescu G (2009) An investigation of the dynamics of coherent structures in a turbulent channel flow with a vertical sidewall obstruction. Phys of Fluids 21:085104. doi:10.1063/1.3207859
Mahesh K, Constantinescu SG, Moin P (2004) A numerical method for large eddy simulation in complex geometries. J Comput Phys 197: 215–240
Mahesh K, Constantinescu SG, Apte S, Iaccarino G, Ham F, Moin P (2006) Large eddy simulation of reacting turbulent flows in complex geometries. J Appl Mech 73: 374–381
McCoy A, Constantinescu G, Weber L (2006) Exchange processes in a channel with two emerged groynes. J Flow Turbul Combust 77: 97–126
McCoy A, Constantinescu SG, Weber L (2007) A numerical investigation of the dynamics of coherent structures and mass exchange processes in a channel flow with two lateral submerged groynes. Water Resour Res 43: W05445. doi:10.1029/2006WRR005267
McCoy A, Constantinescu SG, Weber L (2008) Numerical investigation of flow hydrodynamics in a channel with a series of groynes. J Hydraul Eng 134(2): 157–172
Monin AS, Yaglom AM (1971) Statistical fluid mechanics. Volume 1: Mechanics of turbulence. MIT Press, Cambridge
Muto Y, Baba Y, Fujita I (2002) Velocity measurements in rectangular embayments attached to a straight open channel. In: Proceedings of river flow 2002, Louvain-la-Neuve, Belgium, pp 1213–1219
Nezu I, Onitsuka K, Yano M (2002) PIV measurements in side-cavity open-channel flows with and without sediment transport. In: Proceedings of the 10th international symposium on flow visualization, Kyoto, Japan
Pusch M, Fischer H (2006) Stoffdynamik und Habitatstruktur in der Elbe. Weissensee Verlag, Berlin
Reichert P, Borsuk M, Hostmann M, Schweizer S, Spörri C, Tockner K, Truffer B (2007) Concepts of decision support for river rehabilitation. Environ Softw Model 22: 188–201
Reynolds CS (1988) Potomoplankton: paradigms, paradoxes, prognoses. In: Algae and aquatic environment. Biopress, Bristol, pp 285–311
Sukhodolov A, Sukhodolova T (2007) Coherent structures in river flows over submerged vegetation: experimental study in a lowland river. In: Cowen EA et al (eds) Hydraulic measurements & experimental methods. Proceedings of international conference, Lake Placid, USA, September 2007, pp 172–177
Sukhodolov A, Uijttewaal WSJ, Engelhardt C (2002) On the correspondence between morphological and hydrodynamical patterns of groyne fields. Earth Surf Process Landf 27: 289–305
Sukhodolov A, Engelhardt C, Kruger A, Bungartz H (2004) Case study: turbulent flow and sediment distributions in a groyne field. J Hydraul Eng 130(1): 1–9
Sukhodolov A, Schnauder I, Anlager C, Rauch HP, Uijttewaal W (2008) Field experiments on flow hydrodynamics and exchange processes in groyne fields. In: Altinakar et al (eds) River flow 2008, proceedings of international conferences, Cesme, Turkey, September 2008, pp 865–874
Tockner K, Karaus U, Paetzold A, Claret C, Zettel J (2006) Ecology of braided rivers. In: Sambrook Smith G, Best J, Bristow C, Petts GE (eds) Braided rivers. IAS special publication. Blackwell, Oxford, pp 339–358
Uijttewaal W, Lehmann D, van Mazijk A (2001) Exchange processes between a river and its groyne fields: model experiments. J Hydraul Eng 127: 928–936
van Haveren BP, Jackson WL (1986) Concepts in stream riparian rehabilitation. In: Transactions 51st North American wildlife and natural resources conference
Vowinkel B, Schanauder I, Sukhodolov A (2007) Spectral dynamics of turbulence in shallow mixing layers at a confluence of two parallel streams. In: Cowen EA et al (eds) Hydraulic measurements & experimental methods. Proceedings of international conference, Lake Placid, USA, September 2007, pp 635–640
Weitbrecht V, Kuhn G, Jirka GH (2002) Large scale PIV-measurements at the free surface of shallow water flows. Flow Meas Instrum 13: 237–245
Weitbrecht V, Socolofsky SA, Jirka GH (2008) Experiments on mass exchange between groin fields and the main stream in rivers. J Hydraul Eng 134(2): 173–183
Woolsey S, Gonser T, Hostmann M, Junker B, Paetzold A, Roulier C, Schweizer S, Tiegs SD, Tockner K, Weber C, Peter A (2007) A strategy to assess river restoration projects. Freshw Biol 52: 752–769
Zeng J, Constantinescu G, Blanckaert K, Weber L (2008) Flow and bathymetry in sharp open-channel bends: experiments and predictions. Water Resources Research 44:W09401, doi:10.1029/2007WR006303
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Constantinescu, G., Sukhodolov, A. & McCoy, A. Mass exchange in a shallow channel flow with a series of groynes: LES study and comparison with laboratory and field experiments. Environ Fluid Mech 9, 587–615 (2009). https://doi.org/10.1007/s10652-009-9155-2
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DOI: https://doi.org/10.1007/s10652-009-9155-2