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using a 3D laser scanner, a flying-probe system, and an IPT carriage are also
presented, where the geometry of the 2D autocorrelation function (or the closely
related second-order structure function) is found to provide an effective means of
assessing the three-dimensionality of waves in measured bed surfaces.
Acknowledgments I am very grateful to the organising committee of the 30th International
School of Hydraulics for their invitation to present this chapter as a lecture. I also acknowledge
the support of this committee and the University of Auckland Cross-faculty Research Initiatives
Fund to enable my attendance at the school. I wish to thank the colleagues and students who have
shared the ideas and adventures leading to the studies described herein, including Bruce Melville,
Burkhard Eling, Graeme Twose, Marcelo Garcia, Juan Fedele, Wylie Wong, Rodrigo Musalem,
Kirsty Coleman, Vladimir Nikora, Derek Goring, Dougal Clunie, Heide Friedrich, Ted Schlicke,
Stuart Cameron, Andries Paarlberg, Joost Lansink, Mark Trevethan, John Cater, Azin Kusari, John
Boys, and Grant Covic. In particular, experimental studies are indebted to the technicians who can
turn ideas and fancy into reality. In this regard, the present studies have particularly benefitted
from the technical skills of Jim Bickner, Ray Hoffman, Gary Carr, Mark Twiname, Jim Luo, and
Geoff “Mythbuster” Kirby. The writer's research discussed in this paper was partly funded by the
Marsden Fund (Grant UOA220) administered by the Royal Society of New Zealand.
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