Figure 18. Cross-sectional views of transverse (profiles A and B) and barchanoid (profile C) sand waves from the digital terrain model produced from bathymetric data collected during National Oceanic and Atmospheric Administration survey H12012. Sand-wave asymmetry indicates westward net sediment transport; the presence of megaripples on stoss slopes suggests transport is active. Locations of profiles are shown in figure 13; vertical exaggerations of profiles A, B, and C are 54, 9, and 22, respectively.