{"refrec":{"BRefID":211434,"RR":"<b>Douxchamps, D.; Devriendt, D.; Capart, H.; Craeye, C.; Macq, B.; Zech, Y.</b> (2000). Three-dimensional reconstruction of the oscillatory free-surfaces of a flow over antidunes: stereoscopic and velocimetric techniques, <b><i>in</i></b>: IEEE <i>OCEANS 2000 MTS/IEEE Conference and Exhibition. Oceans (New York),</i> 1-3: pp. 1535-1542","BEntID":203356,"PublicFlag":1,"CheckedFlag":1,"wosflag":0,"vabbflag":null,"RefStringPartII":", <b><i>in</i></b>: IEEE <i>OCEANS 2000 MTS/IEEE Conference and Exhibition. Oceans (New York),</i> 1-3: pp. 1535-1542","DocTypID":17,"DocType":"Book chapters","MarineFlag":0,"FreshFlag":0,"BrackishFlag":0,"TerrestrialFlag":0,"Authorstring":"Douxchamps, D.; Devriendt, D.; Capart, H.; Craeye, C.; Macq, B.; Zech, Y.","OrigTitleTranslFlag":0,"Authorstringtrunc":"Douxchamps, D. <i>et al.</i>","Englishabstract":"We present imaging methods developed to characterize the oscillatory free-surface of rapid flows and apply them to torrential currents propagating over sediment antidunes. The aim is to obtain high-resolution relief maps of the free-surface topography, in order to highlight the regular spatial patterns associated with the bedforms. Two measurement principles are outlined and tested, both based on the imaging of floating tracers dispersed on the rapidly flowing surface. The first relies on direct stereoscopic measurements obtained using two cameras, while the second exploits an original velocimetric principle allowing to derive elevation from the velocity field acquired using a single camera. The measurement procedures and image analysis algorithms are introduced for the two methods, along with the physical assumptions underlying the velocimetric principle. The results of the two techniques are compared for different foe-surface patterns and good correspondence is obtained. 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