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CHEMOSENSORY-MEDIATED FORAGING IN A TURBULENT BOUNDARY LAYER

Donald R. Webster
School of Civil and Environmental Engineering Georgia Institute of Technology Atlanta, GA 30332-0355 USA

S. Rahman
School of Civil & Environmental Engineering Georgia Institute of Technology, Atlanta, Georgia 30332, USA

L. P. Dasi
School of Civil & Environmental Engineering, Georgia Institute of Technology, Atlanta, Georgia 30332, USA

要約

Concentration measurements of a chemical plume in a turbulent open channel flow are collected using planar laser-induced fluorescence (PLIF). The objective is to document the chemosensory cues that may be useful to a rapidly moving animal tracking the chemical odor. The plume is released iso-kinetically into the logarithmic layer of a fully developed turbulent boundary layer for two bed surfaces: fine gravel and painted steel. Of interest is the variation of the sensory cues, particularly a spanwise correlation function, with bed roughness. It has been hypothesized that animals, such as blue crabs, use a bilateral comparison of the chemosensory signal to steer toward the plume centerline. The current study represents the first step in understanding the effect of bed roughness on the turbulent transport and specifically addresses the usefulness of bilateral comparison to chemical plume tracking.