Wave-, wind-, and tide-driven circulation at a well-mixed ocean inlet
Wargula, Anna E.
MetadataShow full item record
The effects of waves, wind, and bathymetry on tidal and subtidal hydrodynamics at unstratified, shallow New River Inlet, NC, are evaluated using field observations and numerical simulations. Tidal flows are ebb-dominated (-1.5 to 0.6 m/s, positive is inland) inside the main (2 to 5 m deep) channel on the (1 to 2 m deep) ebb shoal, owing to inflow and outflow asymmetry at the inlet mouth. Ebb-dominance of the flows is reduced during large waves (> 1 m) owing to breaking-induced onshore momentum flux. Shoaling and breaking of large waves cause depression (setdown, offshore of the ebb shoal) and super-elevation (setup, on the shoal and in the inlet) of the mean water levels, resulting in changes to the cross-shoal pressure gradient, which can weaken onshore flows. At a 90-degree bend 800-m inland of the inlet mouth, centrifugal acceleration owing to curvature drives two-layered cross-channel flows (0.1 to 0.2 m/s) with surface flows going away from and bottom flows going toward the bend. The depthaveraged dynamics are tidally asymmetric. Subtidal cross-channel flows are correlated (r2 > 0.5) with cross-channel wind speed, suggesting that winds are enhancing and degrading the localcurvature- induced two-layer flow, and driving three-layer flow.
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 June 2017
Suggested CitationThesis: Wargula, Anna E., "Wave-, wind-, and tide-driven circulation at a well-mixed ocean inlet", 2017-06, DOI:10.1575/1912/9059, https://hdl.handle.net/1912/9059
Showing items related by title, author, creator and subject.
A qualitative and quantitative study of the distribution of pelagic sediment in the Atlantic Basin Webb, Helen F. (Massachusetts Institute of Technology and Woods Hole Oceanographic Institution, 1997-02)Pelagic sedimentation is the primary modifier of topography generated by ridge-associated volcanic and tectonic processes. This thesis represents an effort to understand the processes of, and the general distribution of, ...
Acoustic scattering by axisymmetric finite-length bodies with application to fish : measurement and modeling Reeder, D. Benjamin (Massachusetts Institute of Technology and Woods Hole Oceanographic Institution, 2002-06)This thesis investigates the complexities of acoustic scattering by finite bodies in general and by fish in particular through the development of an advanced acoustic scattering model and detailed laboratory acoustic ...
Nadakuditi, Rajesh Rao (Massachusetts Institute of Technology and Woods Hole Oceanographic Institution, 2002-02)One of the major problems in wireless communications is compensating for the time-varying intersymbol interference (ISI) due to multipath. Underwater acoustic communications is one such type of wireless communications ...