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Flow kinematics and dynamics controlling tracer movement and shallow-water wave propagation in the Hudson River

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dc.contributor.advisor Wilson, Robert E en_US
dc.contributor.author Wang, Jindong en_US
dc.contributor.other Department of Marine and Atmospheric Science en_US
dc.date.accessioned 2017-09-18T23:49:49Z
dc.date.available 2017-09-18T23:49:49Z
dc.date.issued 2012-12-01 en_US
dc.identifier.uri http://hdl.handle.net/11401/76025 en_US
dc.description 206 pgs en_US
dc.description.abstract Analyses of ship borne ADCP, salinity and dye tracer data from a 2002 experiment in a reach of the lower Hudson Estuary emphasize the influence of bottom topography on halocline position within the water column and dye tracer movement relative to isohalines. Halocline slope and halocline position within the water column during both flood and ebb and their relationship to bottom topography and bottom friction are described in terms of both the quasi-steady two-layer frictional hydraulics and tidally generated internal waves. Hindcast simulations using ROMS for the same reach provide detailed description of 3D velocity field and salinity field to support the analyses. The spatially and temporally-varying vertical shear, strain rate and Richardson Number are estimated from both the observed and model data. The results indicate that halocline fluctuations and vertical tracer movement are significantly enhanced especially at the maximum ebb and flood and are closely related to strong vertical advection induced by the bottom valleys and hills. In addition, tracer dispersion is mainly controlled by vertical mixing induced by strong current shear. Strong vertical mixing regions are present not only within the bottom boundary layer during flood but also at the upstream slope of the bottom valleys and hills during ebb and at the current frontal zone during the transition from ebb to flood. The model results also suggest that the sudden release of the internal wave leads to enhanced vertical mixing in the vicinity of the halocline during the transition from ebb to flood. Analyses of extensive observations from ADCPs moored in the channel extending from the lower Hudson to the upper reaches near Troy reveal significant overtides and longitudinal variation in tidal amplitude and phase. The results show that the tides and overtides are strongly influenced by local topographic variations and the longitudinal position in the river dependent on the ratio of tidal wavelength to channel length. Analyses of water level observations from gauges distributed along the river from the Battery to Troy compliment the current observations. Mechanisms of overtide generation and tidal wave propagation are investigated by both one-dimensional model following Parker (1984) and two-dimensional ROMS model. Results emphasize the importance of nonlinear terms in over-tide generation, the influence of variations in channel depth and cross-section, and the importance of tidal wavelength to channel length. These results motivated further study of the interactions between storm surge, river pulse, and tide in the Hudson River. Hindcast simulations using both one-dimensional and two-dimensional models provide detailed description of water elevation and current throughout the Hudson River from the Battery to Troy to support the analyses. In addition, longitudinal variation in surge height and surge timing, and the effects of nonlinearity and channel morphology change on surge, will be discussed based on the model results in both a generic channel and the Hudson River. en_US
dc.description.sponsorship This work is sponsored by the Stony Brook University Graduate School in compliance with the requirements for completion of degree. en_US
dc.format Monograph en_US
dc.format.medium Electronic Resource en_US
dc.language.iso en_US en_US
dc.publisher The Graduate School, Stony Brook University: Stony Brook, NY. en_US
dc.subject.lcsh Physical oceanography en_US
dc.subject.other Channel morphology, Internal motion, Shallow-water wave propagation, Storm surge and river pulse, Tides and overtides, Tracer movement en_US
dc.title Flow kinematics and dynamics controlling tracer movement and shallow-water wave propagation in the Hudson River en_US
dc.type Dissertation en_US
dc.mimetype Application/PDF en_US
dc.contributor.committeemember Wang, Dong-Ping en_US
dc.contributor.committeemember Bowman, Malcolm en_US
dc.contributor.committeemember Blumberg, Alan en_US
dc.contributor.committeemember Chant, Robert en_US
dc.contributor.committeemember Aikman, Frank en_US

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