Intake flow fields for a zooplankton pump sampling system
Brooks, James Ray
MetadataShow full item record
The flow fields entering intake forms oriented into a steady flume flow has been observed and quantified. This data is applied to a model of zooplankton sampler performance, to predict the fraction of the sampled fluid from which no animals will escape under conditions similar to those of the tests. Flume flow speeds (≈5 cm/s) and intake pumping rate (≈33 gal/min) are scaled by a factor of 20 in the model, while test form dimensions (4 and 7 inch throats and 12 inch outside diameters) are considered to be full-size for the prototype pump samplers. The data presented can be applied to other flow and geometrical scales. The 'lethal cone' and critical fluid deformation rate envelopes are evaluated for eleven intake forms: pointed, bullet-shaped, funnel-shaped, rounded and square-ended. The sharply-pointed intake performed test, for tow speed ≈100 cm/s, swimming speed=30 cm/s and Dc=1. 0 sec-1. 'Sure capture' is predicted in 83% of the sampled water. The four funnel-shaped forms follow consecutively in a rank ordering, with efficiencies, of 77% to 68%.
Submitted in partial fulfillment of the requirements for the degree of Ocean Engineer at the Woods Hole Oceanographic Institution and the Massachusetts Institute of Technology and for the degree of Ocean Engineer at the Massachusetts Institute of Technology August 1979
Showing items related by title, author, creator and subject.
The ecology of colonial radiolarians : their colony morphology, trophic interactions and associations, behavior, distribution, and the photosynthesis of their symbionts Swanberg, Neil Ralph (Massachusetts Institute of Technology and Woods Hole Oceanographic Institution, 1979-08)Colonial radiolarians (Spumellaria) are among the most common and abundant large zooplankton, but they have been little studied by modern biologists. Colonies were found on 98% of epipelagic diving stations in the period ...
Distribution, patchiness, and behavior of Antarctic zooplankton, assessed using multi-frequency acoustic techniques Lawson, Gareth L. (Massachusetts Institute of Technology and Woods Hole Oceanographic Institution, 2006-09)The physical and biological forces that drive zooplankton distribution and patchiness in an antarctic continental shelf region were examined, with particular emphasis on the Antarctic krill, Euphausia superba. This was ...
Barbeau, Katherine A. (Massachusetts Institute of Technology and Woods Hole Oceanographic Institution, 1998-05)Planktonic protozoan grazers have the potential to significantly affect the chemistry of particle-associated trace metals. This is due both to the importance of protists as consumers of bacterial-sized particles, and to ...