Simultaneous LIF and PIV Measurements of a Laboratory Modeled Coastal Plume

Qian, Lei; Zarruk, Gustavo A.; Cowen, Edwin A.

doi:10.1061/40517(2000)323

Cited by 1 publication

(2 citation statements)

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“…In fact, the cross-correlation, vЈcЈ, has been quantified for a jet by Webster et al (2001), among others, and for a plume by Liao et al (2000). The term ''flavored eddy,'' however, is a poor descriptor of the plume behavior.…”

Section: Discussionmentioning

confidence: 99%

“…In each example there is net transport of tracer away from the plume centerline, which suggests that the correlation between the fluctuating velocity and fluctuating concentration is nonzero. In fact, the cross-correlation, vЈcЈ, has been quantified for a jet by Webster et al (2001), among others, and for a plume by Liao et al (2000). The term ''flavored eddy,'' however, is a poor descriptor of the plume behavior.…”

Section: Discussionmentioning

confidence: 99%

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Chemosensory guidance cues in a turbulent chemical odor plume

Webster

Weissburg

2001

Limnology & Oceanography

150

168

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The characteristics of chemical odor plumes released into a turbulent open channel flow are evaluated in the context of chemical plume tracking. The objective is to assess the availability and usefulness of chemosensory cues to animals, such as benthic crustaceans, attempting to orient in the plume. Releasing fluorescent dye into the fully developed turbulent boundary layer of a large laboratory-scale flume created turbulent odor plumes. Flow visualization of odor fields created with varying release velocity, release distance from the bed, and nozzle diameter indicated that chemosensory cues in plumes depend on the release characteristics as well as the ambient flow conditions. Thus, to understand animal behavior, it is important to quantify the plume release properties and characteristics. We chose to quantify concentration fields for the case of isokinetic release using the planar laser-induced fluorescence technique. These measurements indicate that the time-averaged concentration converges far too slowly to be useful to a foraging animal. Similarly, resolving the rise slope of a concentration burst requires sampling rates unattainable by animals, and the spatial variation of rise slope is too mild to follow without lengthy sampling periods. In addition, only mild variation with distance from the source is observed in the concentration burst magnitude and duration. Thus, the time-averaged concentration, rise slope, and burst shape all appear to have limited usefulness for plume orientation for animals known to orient effectively to these types of odor sources.Sensory systems in organisms translate spatial and temporal patterns of physical properties into electrical signals that mediate animal responses. Light, sound, pressure, and chemical concentration, among others, are stimuli that are used by animals to collect information on their external world, and which evoke various behaviors necessary for survival. Understanding the operation of perceptual systems provides information on ecological interactions mediated by various sensory modalities, as well as on basic neurological mechanisms of encoding and processing information.A fundamental tenet in the analysis of sensory systems is that they are not fully interpretable until the appropriate sensory environment is characterized or defined. In other words, unless the nature of the input to a sensory system is known, the details and functions of its operation will be obscured. For instance, the elegant construction of the eyes of some insects allows them to use polarized light as a navigational aid. This design is contingent on the orientation of regions of the eye corresponding to the orientation of the e-vector of polarized light emanating from the sector of the sky scanned by each region. Thus, the map of the eye cannot be appreciated unless one has similarly obtained a map of the sky (Wehner 1989).The physical cues used by many sensory modalities offer convenient dimensions for characterization of stimulus patterns, even in the spatial or temporal do...

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%