Hydrodynamics and morphodynamics of shallow tidal channels and intertidal flats


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dc.contributor.author Friedrichs, Carl T.
dc.date.accessioned 2006-08-17T16:24:40Z
dc.date.available 2006-08-17T16:24:40Z
dc.date.issued 1993-02
dc.identifier.uri http://hdl.handle.net/1912/1176
dc.description Submitted in partial fulfillment of the requirements for the degree of Doctor of Philosophy at the Massachusetts Institute of Technology and the Woods Hole Oceanographic Institution, February, 1993 en
dc.description.abstract In this thesis, mechanisms which control morphodynamics of shallow tidal embayments are investigated analytically. In the process of exploring these mechanisms (specifically asymmetries in bottom stress, τ), basis momentum and mass balances which govern flow in these systems are clarified. Temporal asymmetries in τ are investigated via a new perturbation scheme which quantifies nonlinear processes and combines geometric controls on asymmetry into a single non-dimensional parameter. Implications of spatial asymmetries in τ are investigated though stability criteria based on a uniform distribution of τ. Morphologic observations of both tidal channels and intertidal flats are consistent with a unifonn distribution of τ at equilibrium. Investigation of morphodynamic mechanisms leads to scalings of momentum and continuity which diverge from classical models. Scalings for prismatic channels with strong tidal asymmetries indicate friction often dominates acceleration in the momentum equation. The resulting "zero-inertia" balance gives a time-varing diffusion equation which requires along-channel amplitude to decay. Uniform τ justifies a new scaling of continuity for exponentially-shaped channels. In such channels, along-channel gradients in tidal velocity are small and are often dominated by gradients in cross-sectional area. The resulting first-order wave equation allows only constant amplitude, forward propagating waveforms which are independent of channel length. en
dc.description.sponsorship Funding was provided by the Offce of Naval Research through the American Society for Engineering Education and the National Science Foundation under grant OCE91-02429. en
dc.format.extent 8922475 bytes
dc.format.mimetype application/pdf
dc.language.iso en_US en
dc.publisher Woods Hole Oceanographic Institution en
dc.relation.ispartofseries WHOI Technical Reports en
dc.relation.ispartofseries WHOI-93-17 en
dc.relation.ispartofseries WHOI Theses en
dc.subject Tidal channels en
dc.subject Hydrodynamics en
dc.subject Tidal flats en
dc.title Hydrodynamics and morphodynamics of shallow tidal channels and intertidal flats en
dc.type Technical Report en
dc.type Thesis en
dc.identifier.doi 10.1575/1912/1176

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