Simulated Sand Wave Initiation (IMAGE) American Institute of Physics Caption Simulated sand wave initiation in 3D contours of bed elevation corresponding to a) t=0.2 seconds, b) 400 seconds, c) 800 seconds, d) 1,600 seconds, e) 3,200 seconds, and f) 4,800 seconds. Credit Hongwei Fang Usage Restrictions Image can only be used with credit License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.