|Date: Friday, April 13, 2018
Location: 1084 East Hall (4:10 PM to 5:00 PM)
Title: Topographically induced Non-Gaussian Water Waves
Abstract: Rogue waves have been of great interest in recent times with several proposed generation mechanisms currently under investigation. We present new laboratory experiments that reveal that bathymetry can qualitatively alter the distribution of randomized surface waves; a normally-distributed incoming wave field becomes skewed and highly non-Gaussian after encountering a step in terrain. A short distance downstream of the step, the wave-field is very accurately characterized by the gamma distribution, affording simple estimates for the skewness, kurtosis, and other statistical properties. Importantly, the exponential decay of the gamma distribution is much slower than Gaussian decay, signifying that extreme events occur more frequently. Our results also show that popular measures of rogue activity may be misleading. Clean linear regressions in surface probability distribution parameters as a function of forcing amplitude allow for more quantitative work in the future.
Speaker: Tyler Bolles
Institution: University of Michigan
Event Organizer: Audra McMillan firstname.lastname@example.org