Rates and patterns of thermal mixing at a small stream confluence under variable incoming flow conditions

Hydrological Processes

Volumn 29, Issue 20, 2015, Pages 4442-4456

  Lewis, Quinn W ^a   Rhoads, Bruce L ^a  

^a UNIVERSITY OF ILLINOIS AT URBANA CHAMPAIGN   (United States)

Author keywords

Confluence; Mixing; Temperature

Indexed keywords

MIXING; MOMENTUM; RIVERS; TEMPERATURE;

CONFLUENCE; CROSS SECTIONAL AREA; DENSITY DIFFERENCE; DOWNSTREAM CHANNELS; DRAINAGE NETWORKS; EVENT-SPECIFIC; HELICAL MOTION; MOMENTUM FLUX RATIOS;

MIXER CIRCUITS;

FLUX MEASUREMENT; MIXING RATIO; RIVER FLOW; TEMPERATURE EFFECT; TRIBUTARY;

EID: 84940788127     PISSN: 08856087     EISSN: 10991085     Source Type: Journal    
DOI: 10.1002/hyp.10496     Document Type: Article

References (41)

1. Ashmore PE, Parker G. 1983. Confluence scour in coarse braided streams. Water Resources Research 19(2): 392-402. DOI:10.1029/WR019i002p00392.
2. Best JL. 1987. Flow dynamics at river channel confluences: implications for sediment transport and bed morphology. In Recent Developments in Fluvial Sedimentology, Ethridge FG, Flores RM, Harvey MD (eds). SEPM (Society of Economic Paleontologists and Mineralogists): Tulsa, Oklahoma, USA 39: 27-35.
3. Best JL. 1988. Sediment transport and bed morphology at river channel confluences. Sedimentology 35.3: 481-498.
4. Biron P, Roy AG, Best JL. 1996a. Turbulent flow structure at concordant and discordant open-channel confluences. Experiments in Fluids 21: 437-446.
5. Biron P, Best JL, Roy AG. 1996b. Effects of bed discordance on flow dynamics at open channel confluences. Journal of Hydraulic Engineering 122: 676-682.
6. Biron P, Ramamurthy AS, Han S. 2004. Three-dimensional numerical modeling of mixing at river confluences. Journal of Hydraulic Engineering 130: 243-253.
7. Bouchez J, Lajeunesse E, Gaillardet J, France-Lanord C, Dutra-Maia P, Maurice L. 2010. Turbulent mixing in the Amazon River: the isotopic memory of confluences. Earth and Planetary Science Letters 290: 37-43.
8. Bradbrook KF, Biron P, Lane SN, Richards KS, Roy AG. 1998. Investigation of controls on secondary circulation and mixing processes in a simple confluence geometry using a three-dimensional numerical model. Hydrological Processes 12: 1371-1396.
9. Bradbrook KF, Lane SN, Richards KS. 2000. Numerical simulation of three-dimensional time-averaged flow structure at river channel confluences. Water Resources Research 36: 2731-2746.
10. Bradbrook KF, Lane SN, Richards KS, Biron P, Roy AG. 2001. Role of bed discordance at asymmetrical open-channel confluences. Journal of Hydraulic Engineering 127: 351-368.
11. Brown GL, Roshko A. 1974. On density effects and large structure in turbulent mixing layers. Journal of Fluid Mechanics 64.04: 775-816.
12. Bruno MS, Muntisov M, Fischer HB. 1990. Effect of buoyancy on transverse mixing in streams. Journal of Hydraulic Engineering 116: 1484-1494.
13. Buchanan TJ, Somers WP. 1969. Discharge Measurements at Gaging Stations. US Government Printing Office: Washington, DC.
14. Buffin-Bélanger T, Roy AG. 2005. 1 min in the life of a river: selecting the optimal record length for the measurement of turbulence in fluvial boundary layers. Geomorphology 68.1: 77-94. DOI:10.1016/j.geomorph.2004.09.032.
15. Chu VH, Abdelwahed MST. 1990. Shore attachment of buoyant effluent in strong crossflow. Journal of Hydraulic Engineering 116: 157-175.
16. Constantinescu G, Miyawaki S, Rhoads B, Sukhodolov A, Kirkil G. 2011. Structure of turbulent flow at a river confluence with momentum and velocity ratios close to 1: insight provided by an eddy-resolving numerical simulation. Water Resources Research 47: W05507. DOI: 10.1029/2010WR010018
17. Constantinescu G, Miyawaki S, Rhoads BL, Sukhodolov AN. 2012. Numerical analysis of the effect of momentum ratio on the dynamics and sediment-entrainment capacity of coherent flow structures at a stream confluence. Journal of Geophysical Research, Earth Surface 117: F4. DOI:10.1029/2012JF002452.
18. Constantinescu G, Miyawaki S, Rhoads BL, Sukhdolov AN. 2014. Numerical evaluation of the effects of planform geometry and inflow conditions on flow, turbulence structure, and bed shear velocity at a stream confluence with a concordant bed. Journal of Geophysical Research - Earth Surface . DOI:10.1029/2012JF002452.
19. DeSerres B, Roy AG, Biron PM, Best JL. 1999. Three-dimensional structure of flow at a confluence of river channels with discordant beds. Geomorphology 26: 313-335.
20. Frothingham KM, Rhoads BL. 2003. Three-dimensional flow structure and channel change in an asymmetrical compound meander loop, Embarras River, Illinois. Earth Surface Processes and Landforms 28(6): 625-644. DOI:10.1002/esp.471.
21. Gaudet JM, Roy AG. 1995. Effect of bed morphology on flow mixing length at river confluences. Nature 373: 138-139.
22. Kabeya N, Kubota T, Shimizu A, Nobuhiro T, Tsuboyama Y, Chann S, Tith N. 2008. Isotopic investigation of river water mixing around the confluence of the Tonle Sap and Mekong rivers. Hydrological Processes 22(9): 1351-1358. DOI:10.1002/hyp.6944.
23. Kenworthy ST, Rhoads BL. 1995. Hydrologic control of spatial patterns of suspended sediment concentration at a stream confluence. Journal of Hydrology 168(1): 251-263.
24. Lane SN, Parsons DR, Best JL, Orfeo O, Kostaschuk RA, Hardy RJ. 2008. Causes of rapid mixing at a junction of two large rivers: Rio Parana and Rio Paraguay, Argentina. Journal of Geophysical Research, Earth Surface 113: F02019. DOI: 10.1029/2006JF000745
25. Laraque A, Guyot JL, Filizola N. 2009. Mixing processes in the Amazon River at the confluences of the Negro and Solimñoes rivers, Encontro das Aguas, Manaus, Brazil. Hydrological Processes 23: 3131-3140. DOI:10.1002/hyp.7388.
26. Mackay JR. 1970. Lateral mixing of the Liard and Mackenzie rivers downstream from their confluence. Canadian Journal of Earth Sciences 7.1: 111-124.
27. Mosley MP. 1976. An experimental study of channel confluences. Journal of Geology 84: 535-562.
28. Parsons DR, Best JL, Lane SN, Orfeo O, Hardy RJ, Kostaschuk R. 2007. Form roughness and the absence of secondary flow in a large confluence-diffluence, Rio Paraná, Argentina. Earth Surface Processes and Landforms 32: 155-162. DOI:10.1002/esp.1457.
29. Ramón CL, Hoyer AB, Armengol J, Dolz J, Rueda FJ. 2013. Mixing and circulation at the confluence of two rivers entering a meandering reservoir. Water Resources Research 49.3: 1429-1445. DOI:10.1002/wrcr.20131.
30. Ramón CL, Armengol L, Dolz L, Prats J, Rueda FJ. 2014. Mixing dynamics at the confluence of two large rivers undergoing weak density variations. Journal of Geophysical Research, Oceans 119.4: 2386-2402. DOI:10.1002/2013JC009488.
31. Rathbun RE, Rostad CE. 2004. Lateral mixing in the Mississippi River below the confluence with the Ohio River. Water Resources Research 40: W05207. DOI: 10.1029/2003WR002381
32. Rhoads BL. 1996. Mean structure of transport-effective flows at an asymmetrical confluence when the main stream is dominant. In Coherent Flow Structures in Open Channels: Origins, Scales and Interactions with Sediment Transport and Bed Morphology, Ashworth PJ, Bennett SJ, Best JL, McLelland SJ (eds). Wiley: Chichester; 491-517.
33. Rhoads BL, Kenworthy ST. 1995. Flow structure at an asymmetrical confluence. Geomorphology 11: 273-293.
34. Rhoads BL, Kenworthy ST. 1998. Time-averaged flow structure in the central region of a stream confluence. Earth Surface Processes and Landforms 23: 171-191.
35. Rhoads BL, Sukhodolov AN. 2001. Field investigation of three dimensional flow structure at stream confluences: 1. Thermal mixing and time-averaged velocities. Water Resources Research 37: 2393-2410. DOI:10.1029/2001WR000316.
36. Rhoads BL, Sukhodolov AN. 2004. Spatial and temporal structure of shear layer turbulence at a river confluence. Water Resources Research 40: W06304. DOI: 10.1029/2003WR002811
37. Rhoads BL, Sukhodolov AN. 2008. Lateral momentum flux and spatial evolution of flow within a confluence mixing interface. Water Resources Research 44: W08440. DOI: 10.1029/2007WR006634
38. Rhoads BL, Riley JD, Mayer DR. 2009. Response of bed morphology and bed material texture to hydrological conditions at an asymmetrical stream confluence. Geomorphology 109: 161-173. DOI:10.1016/j.geomorph.2009.02.029.
39. Rutherford JC. 1994. River Mixing. J. Wiley & Sons: New York.
40. Sukhodolov AN. 2012. Structure of turbulent flow in a meander bend of a lowland river. Water Resources Research 48.1: . DOI:10.1029/2011WR010765.
41. Sukhodolov AN, Rhoads BL. 2001. Field investigation of three-dimensional flow structure at stream confluences: 2. Turbulence. Water Resources Research 37: 2411-2424. DOI:10.1029/2001/WR000317.