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dc.contributor.authorPaola, Christopher  Concept link
dc.date.accessioned2005-11-18T13:26:53Z
dc.date.available2005-11-18T13:26:53Z
dc.date.issued1983-06
dc.identifier.urihttps://hdl.handle.net/1912/143
dc.descriptionSubmitted in partial fulfillment of the requirements for the degree of Doctor of Science at the Massachusetts Institute of Technology and the Woods Hole Oceanographic Institution.en
dc.description.abstractThe first of two sets of data reported here, measured over two-dimensional immobile current ripples, comprises skin-friction time series at four streamwise positions and velocity profiles measured to within a few mm of the bed. The velocity profiles cannot be linked to the local mean skin friction through the law of the wall, so they do not represent an internal boundary layer growing downstream of reattachment. Rather the velocity field is the sum of a spatially averaged rotational profile and a locally inviscid perturbation. Normalized skin-friction spectra are independent of position, but skin-friction probabilty density functions show strong increases in skewness and kurtosis near reattachment. The second set of data comprises measurements of the skin-friction vector field around isolated hemispheres with and without model sedimentary tails, and skinfriction and velocity measurements on arrays of hemispheres with and without tails. The skin-friction field around an isolated hemisphere is not consistent with formation of growth of a sedimentary tail more than about two obstacle heights long. The skin-friction field in a hemisphere array of areal density 0.02 is significantly distorted from the isolated-element case, and the roughness length in arrays of two areal densities is not altered by addition of tails.en
dc.description.sponsorshipFunding was provided by the National Science Foundation under Grant aCE 77-20437 and by the Office of Naval Research under Contract N00014-80-C-0273.en
dc.format.extent11418850 bytes
dc.format.mimetypeapplication/pdf
dc.language.isoen_USen
dc.publisherWoods Hole Oceanographic Institutionen
dc.relation.ispartofseriesWHOI Technical Reportsen
dc.relation.ispartofseriesWHOI-83-18en
dc.relation.ispartofseriesWHOI Thesesen
dc.subjectCurrent ripplesen
dc.subjectSkin-friction patternsen
dc.subjectSedimentary tailsen
dc.subjectRoughness lengthen
dc.subjectRough turbulent boundary layersen
dc.subjectOcean bottomen
dc.subjectMarine sedimentsen
dc.subjectFrictional resistance (Hydrodynamics)en
dc.titleFlow and skin friction over natural rough bedsen
dc.typeTechnical Reporten
dc.typeThesisen
dc.identifier.doi10.1575/1912/143


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