The dynamics and kinematics of the coastal boundary layer off Long Island
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 December 1980 Data from the COBOLT experiment, which investigated the first 12 km off Long Island's south shore,...
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Massachusetts Institute of Technology and Woods Hole Oceanographic Institution
1980
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ftwhoas:oai:darchive.mblwhoilibrary.org:1912/3727 2023-05-15T17:36:11+02:00 The dynamics and kinematics of the coastal boundary layer off Long Island Pettigrew, Neal R. North Atlantic Ocean 1980-12 application/pdf https://hdl.handle.net/1912/3727 en_US eng Massachusetts Institute of Technology and Woods Hole Oceanographic Institution WHOI Theses https://hdl.handle.net/1912/3727 doi:10.1575/1912/3727 doi:10.1575/1912/3727 Boundary layer Ocean currents Ocean waves Thesis 1980 ftwhoas https://doi.org/10.1575/1912/3727 2022-05-28T22:58:02Z 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 December 1980 Data from the COBOLT experiment, which investigated the first 12 km off Long Island's south shore, are analyzed and discussed. Moored current meter records indicate that the nearshore flow field is strongly polarized in the alongshore direction and its fluctuations are well correlated with local meteorological forcing. Complex empirical orthogonal function analysis suggests that subtidal velocity fluctuations are barotropic in nature and are strongly influenced by bottom friction. Wind-related inertial currents were observed within the coastal boundary layer (CBL) under favorable meteorological and hydrographical conditions. The magnitude of these oscillations increases with distance from shore, and they display a very clear 180° phase difference between surface and bottom layers. Nearshore inertial oscillations of both velocity and salinity records appear to lead those further seaward, suggesting local generation and subsequent radiation away from the coast. The response of the coastal zone to impulsive wind forcing is discussed using simple slab and two-layer models, and the behavior of the nearshore current field examined. The major features of the observed inertial motions are in good qualitative agreement with model predictions. It is found that, in a homogeneous domain, the coastal boundary condition effectively prohibits inertial currents over the entire coastal zone. In the presence of stratification the offshore extent of this prohibition is greatly reduced and significant inertial currents may occur within one or two internal deformation radii of the coast. The "coastal effect", in the form of surface and interfacial waves which propagate away from the coast, modifies the "pure" inertial response as it would exist far from shore. The kinematics of this process is such that a 180° phase difference between ... Thesis North Atlantic Woods Hole Scientific Community: WHOAS (Woods Hole Open Access Server) Long Island Woods Hole, MA |
institution |
Open Polar |
collection |
Woods Hole Scientific Community: WHOAS (Woods Hole Open Access Server) |
op_collection_id |
ftwhoas |
language |
English |
topic |
Boundary layer Ocean currents Ocean waves |
spellingShingle |
Boundary layer Ocean currents Ocean waves Pettigrew, Neal R. The dynamics and kinematics of the coastal boundary layer off Long Island |
topic_facet |
Boundary layer Ocean currents Ocean waves |
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 December 1980 Data from the COBOLT experiment, which investigated the first 12 km off Long Island's south shore, are analyzed and discussed. Moored current meter records indicate that the nearshore flow field is strongly polarized in the alongshore direction and its fluctuations are well correlated with local meteorological forcing. Complex empirical orthogonal function analysis suggests that subtidal velocity fluctuations are barotropic in nature and are strongly influenced by bottom friction. Wind-related inertial currents were observed within the coastal boundary layer (CBL) under favorable meteorological and hydrographical conditions. The magnitude of these oscillations increases with distance from shore, and they display a very clear 180° phase difference between surface and bottom layers. Nearshore inertial oscillations of both velocity and salinity records appear to lead those further seaward, suggesting local generation and subsequent radiation away from the coast. The response of the coastal zone to impulsive wind forcing is discussed using simple slab and two-layer models, and the behavior of the nearshore current field examined. The major features of the observed inertial motions are in good qualitative agreement with model predictions. It is found that, in a homogeneous domain, the coastal boundary condition effectively prohibits inertial currents over the entire coastal zone. In the presence of stratification the offshore extent of this prohibition is greatly reduced and significant inertial currents may occur within one or two internal deformation radii of the coast. The "coastal effect", in the form of surface and interfacial waves which propagate away from the coast, modifies the "pure" inertial response as it would exist far from shore. The kinematics of this process is such that a 180° phase difference between ... |
format |
Thesis |
author |
Pettigrew, Neal R. |
author_facet |
Pettigrew, Neal R. |
author_sort |
Pettigrew, Neal R. |
title |
The dynamics and kinematics of the coastal boundary layer off Long Island |
title_short |
The dynamics and kinematics of the coastal boundary layer off Long Island |
title_full |
The dynamics and kinematics of the coastal boundary layer off Long Island |
title_fullStr |
The dynamics and kinematics of the coastal boundary layer off Long Island |
title_full_unstemmed |
The dynamics and kinematics of the coastal boundary layer off Long Island |
title_sort |
dynamics and kinematics of the coastal boundary layer off long island |
publisher |
Massachusetts Institute of Technology and Woods Hole Oceanographic Institution |
publishDate |
1980 |
url |
https://hdl.handle.net/1912/3727 |
op_coverage |
North Atlantic Ocean |
geographic |
Long Island |
geographic_facet |
Long Island |
genre |
North Atlantic |
genre_facet |
North Atlantic |
op_source |
doi:10.1575/1912/3727 |
op_relation |
WHOI Theses https://hdl.handle.net/1912/3727 doi:10.1575/1912/3727 |
op_doi |
https://doi.org/10.1575/1912/3727 |
op_publisher_place |
Woods Hole, MA |
_version_ |
1766135589590007808 |