Simple models for turbulent wave-current bottom boundary layer flow : theoretical formulations and applications
Name
56132600-MIT.pdf
Description
Full printable version
Size
4.7 MB
Format
Adobe PDF
Checksum (MD5)
73af53db4e84d372e8114c8fc6799d9b
Author(s)
Sleath, Alison I., 1978-
Advisor(s)
Ole Secher Madsen.
Date Issued
2004
Publisher
Massachusetts Institute of Technology
Abstract
This study presents the theoretical formulations and applications of simple models for turbulent wave-current bottom boundary layer flow. Eddy viscosity formulations are presented for each model in order to analytically solve the governing equations for the bottom boundary layer. Approximations and procedures for obtaining practical solutions of the current velocity profile are presented for the two-layer Madsen-Salles (1998) and three-layer Barreto-Acobe (2001) flow models. Bottom roughness and ripple geometry models are developed for each model using fixed bed laboratory data and movable bed laboratory and field data. Wave attenuation measurements and current profile data are used in order to investigate the bottom roughness length scale for the cases of pure waves, waves in the presence of a current, and currents in the presence of waves. Wave and sediment characteristics are used to formulate a model for wave-generated ripples based on available laboratory and field data. The two-layer Madsen-Salles (1998) and three-layer Barreto-Acobe (2001) flow models are applied in conjunction with the ripple geometry and roughness models for the cases of known and unknown ripple geometry, and an assessment of expected accuracy of application of the models is presented.
Description
Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Civil and Environmental Engineering, 2004.
Includes bibliographical references (leaves 185-190).
Subjects
Civil and Environmental Engineering.
MIT Department
Massachusetts Institute of Technology. Department of Civil and Environmental Engineering
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