Geoscience Reference
In-Depth Information
measurement, with a high temporal resolution, hence the option for LDA. The
second application, describing the flow within the scour hole of a wall-mounted
vertical cylinder on a mobile bed, required fine spatial details of the vortical
structures that develop inside the scour hole. The need to calculate vorticity and
to observe a considerable large flow region conditioned the choice of PIV.
Details on raw data processing and data treatment were offered in order to
highlight the relevance of LDA and PIV techniques to understand the interaction
between turbulent flows and sediment transport. Specific phenomenological conclu-
sions and discussions can be consulted at the end of Sects.
3
and
4
of the present text.
Acknowledgments This research was partially supported by the Portuguese Foundation for
Science and Technology (FCT) through the project PTDC/ECM/65442/2006. Investigation of
local scour around a cylinder was performed with Helena Nogueira and M
´
rio J. Franca. The
author acknowledges Paweł M. Rowi
´
ski, Institute of Geophysics, Poland, for the invitation to
lecture at the 30th International School of Hydraulics, September 2010.
References
Albrecht H-E, Borys M, Damaschke N, Tropea C (2003) Laser Doppler and phase Doppler
measurement techniques. Springer, Berlin
Baker CJ (1980) The turbulent horseshoe vortex. J Wind Eng Ind Aerodyn 6(1-2):9-23
Crowe C, Sommerfeld M, Tsuji Y (1998) Multiphase flows with droplets and particles. CRC, Boca
Raton
Csele M (2004) Fundamentals of light sources and lasers. Wiley, Hoboken. ISBN 0-471-47660-9
Durst F, Melling A, Whitelaw JH (1976) Principles and practice of laser Doppler anemometry.
Academic, London
Ferreira RML (2005) River morphodynamics and sediment transport. Conceptual model and
solutions. Ph.D. thesis, Instituto Superior T´cnico, Technical University of Lisbon, Lisbon
Ferreira RML, Franca MJ, Leal JGAB (2007) Laboratorial and theoretical study of the mobility of
gravel and sand mixtures. In: Dohmen-Janssen CM, Hulscher SJMH (eds) Proceedings of the
5th RCEM, Cambridge University Press, Cambridge, UK, pp 531-539
Franca MJ, Lemmin U (2006) Detection and reconstruction of coherent structures based on
wavelet multiresolution analysis. River Flow 2006 1:181-190
Grass AJ (1971) Structural features of turbulent flow over smooth and rough boundaries. J Fluid
Mech 50:233-255
Gyr A, Schmid A (1997) Turbulent flows over smooth erodible sand beds in flumes. J Hydr Res
35(4):525-544
Hjemfelt AT, Mockros LF (1996) Motion of discrete particles in a turbulent fluid. Appl Sci Res
16(1):149-161
Hurther U, Lemmin U, Terray EA (2007) Turbulent transport in the outer region of rough-wall
open-channel flows: the contribution of large coherent shear stress structures (LC3S). J Fluid
Mech 574:465-493
Krogstad PA, Antonia RA (1999) Surface roughness effects in turbulent boundary layers.
Exp Fluids 27:450-460
Kumar S, Banerjee S (1998) Development and application of a hierarchical system for digital
particle image velocimetry to free-surface turbulence. Phys Fluids 10(1):160-77
Lauterborn W, Vogel A (1984) Modern optical techniques in fluid mechanics. Annu Rev Fluid
Mech 16:223
Lourenco L, Krothapalli A (1995) On the accuracy of velocity and vorticity measurements with
PIV. Exp Fluids 18(6):421-428
