Transport and Mixing Near the Boundary of a Lake

Alvin Anderson Award Ceremony: 

Award Winners: Anne Wilkinson (Civil, Environmental, and Geo- Engineering) and Abigail Tomasek (Civil, Environmental, and Geo- Engineering)


Distinguished Lecture: Chris Rehmann, Associate Professor, Civil, Construction, and Environmental Engineering, Iowa State University

Transport in lakes and oceans is often controlled by turbulence and mixing at sloping boundaries, and determining how the mixed fluid moves from the boundary to the interior is important for estimating basin-wide transport of heat and pollutants. A field experiment in one lake showed that fluid mixed at the boundary can be transported by intrusions that form as the mixed fluid collapses, while an experiment in another lake suggested that the transport is caused by advection and dispersion by internal waves. Our current work on this problem involves laboratory measurements of turbulence caused by near-critical internal waves breaking on a slope; the detailed two-dimensional measurements have many features in common with results from numerical simulations.