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N. Endo, K. Taniguchi, A. Katsuki (2004)
Observation of the whole process of interaction between barchans by flume experimentsGeophysical Research Letters, 31
J. Best (2005)
The fluid dynamics of river dunes: A review and some future research directionsJournal of Geophysical Research, 110
R. Norris (1966)
Barchan Dunes of Imperial Valley, CaliforniaThe Journal of Geology, 74
RL Hastenrath (1967)
The barchans of the Arequipa region, southern PeruZ Geomorphol, 11
B. Andreotti, P. Claudin, S. Douady (2002)
Selection of dune shapes and velocities Part 1: Dynamics of sand, wind and barchansThe European Physical Journal B - Condensed Matter and Complex Systems, 28
G. Sauermann, P. Rognon, A. Poliakov, Hans Herrmann (2000)
The shape of the barchan dunes of Southern MoroccoGeomorphology, 36
N. Lancaster (2009)
Dune Morphology and Dynamics
Ajay Prasad, Ronald Adrian, C. Landreth, P. Offutt (1992)
Effect of resolution on the speed and accuracy of particle image velocimetry interrogationExperiments in Fluids, 13
I. Livingstone, G. Wiggs, M. Baddock (2005)
Barchan dunes: why they cannot be treated as ‘solitons’ or ‘solitary waves’Earth Surface Processes and Landforms, 30
Steven Soloff, R. Adrian, Zi Liu (1997)
Distortion compensation for generalized stereoscopic particle image velocimetryMeasurement Science and Technology, 8
R. Fernandez, J. Best, F. López (2006)
Mean flow, turbulence structure, and bed form superimposition across the ripple‐dune transitionWater Resources Research, 42
G. Wiggs, I. Livingstone, A. Warren (1996)
The role of streamline curvature in sand dune dynamics: evidence from field and wind tunnel measurementsGeomorphology, 17
Joseph Long, R. Sharp (1964)
Barchan-dune movement in Imperial Valley, CaliforniaGeological Society of America Bulletin, 75
Z. Liu, R. Adrian, T. Hanratty (2001)
Large-scale modes of turbulent channel flow: transport and structureJournal of Fluid Mechanics, 448
Pascal Hersen, Ken Andersen, H. Elbelrhiti, Bruno Andreotti, P. Claudin, S. Douady (2003)
Corridors of barchan dunes: Stability and size selection.Physical review. E, Statistical, nonlinear, and soft matter physics, 69 1 Pt 1
I. Livingstone, G. Wiggs, Corinne Weaver (2007)
Geomorphology of desert sand dunes: A review of recent progressEarth-Science Reviews, 80
J. Allen (1968)
Current Ripples : their relation to patterns of water and sediment motion
O. Durán, V. Schwämmle, H. Herrmann (2004)
Breeding and solitary wave behavior of dunes.Physical review. E, Statistical, nonlinear, and soft matter physics, 72 2 Pt 1
Herman Finkel (1959)
The Barchans of Southern PeruThe Journal of Geology, 67
L Sirovich (1987)
Turbulence and the dynamics of coherent structures. Part 1. Coherent structuresQ Appl Math, 45
R. Adrian, C. Meinhart, C. Tomkins (2000)
Vortex organization in the outer region of the turbulent boundary layerJournal of Fluid Mechanics, 422
Zhen‐Ting Wang, S. Tao, Yaowen Xie, G. Dong (2007)
Barchans of Minqin: MorphometryGeomorphology, 89
H. Herrmann, J. Andrade, V. Schatz, G. Sauermann, E. Parteli (2004)
Calculation of the separation streamlines of barchans and transverse dunesPhysica A-statistical Mechanics and Its Applications, 357
C. Meinhart (1994)
Investigation of Turbulent Boundary Layer Structure Using Particle-Image Velocimetry.
J. Rohály, F. Frigerio, D. Hart (2002)
Reverse hierarchical PIV processingMeasurement Science and Technology, 13
S. Douady, P. Hersen (2011)
Dunes, the Collective Behaviour of Wind and Sand, or: Are Dunes Living Beings?
G. Kocurek, R. Ewing (2005)
Aeolian dune field self-organization – implications for the formation of simple versus complex dune-field patternsGeomorphology, 72
W. Cazemier, R. Verstappen, A. Veldman (1998)
Proper orthogonal decomposition and low-dimensional models for driven cavity flowsPhysics of Fluids, 10
L. Sirovich (1987)
Turbulence and the dynamics of coherent structures. II. Symmetries and transformationsQuarterly of Applied Mathematics, 45
F. Khalaf, D. Al-Ajmi (1993)
Aeolian processes and sand encroachment problems in KuwaitGeomorphology, 6
I. Walker, W. Nickling (2002)
Dynamics of secondary airflow and sediment transport over and in the lee of transverse dunesProgress in Physical Geography, 26
D. Parsons, I. Walker, G. Wiggs (2004)
Numerical modelling of flow structures over idealized transverse aeolian dunes of varying geometryGeomorphology, 59
H. Heywood (1941)
The Physics of Blown Sand and Desert DunesNature, 148
RL Hastenrath (1987)
The barchan dunes of southern Peru revisitedZ Geomorphol NF, 31
W. Nickling, C. Neuman (2009)
Aeolian Sediment Transport
Barchan dunes are crescentic planform-shaped dunes that are present in many natural environments, and may occur either in isolation or in groups. This study uses high-resolution particle-image velocimetry (PIV) experiments using fixed-bed models to examine the effects of barchan dune interaction upon the flow field structure. The barchan dune models were created from an idealized contour map, the shape and dimensions of which were based upon previous empirical studies of dune morphology. The experimental setup comprised two, co-axially aligned, barchan dune models that were spaced at different distances apart. In this paper, two volumetric ratios (V r, upstream dune: downstream dune) of 1.0 and 0.175 were examined. Models were placed in a boundary-layer wind tunnel and flow quantification was achieved via PIV measurements of the mean and turbulent flow field in the streamwise–wall-normal plane, along the centerline of the barchan(s), at an average flow Reynolds number of 59,000. The presence of an upstream barchan dune induces a “sheltering effect” on the flow. Flow on the stoss side of the downstream dune is controlled by the developing internal boundary layer from the upstream dune, as well as by the turbulent flow structures shed from the free shear layer of the upstream dune leeside. At both volumetric ratios, enhanced turbulence is present over the downstream barchan dune leeside, which is proposed to be caused by the interaction of shear layers from the upstream and downstream dunes. Both the size and magnitude of the shear layer formed in the leeside of the upstream dune control this interaction, together with the proximity of this shear layer to the stoss side of the downstream dune. Proper orthogonal decomposition (POD) analysis shows that the distribution of turbulent kinetic energy is shifted to higher modes (i.e., smaller spatial scales) over interacting barchan dunes, which also reflects the role of the leeside free shear layer in dominating the flow field by generation, or redistribution, of TKE to smaller scales.
Experiments in Fluids – Springer Journals
Published: Jun 8, 2011
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