Continental shelf waves and the effects of atmospheric pressure and wind stress on sea level

1966 ◽  
Vol 71 (12) ◽  
pp. 2883-2893 ◽  
Author(s):  
B. V. Hamon
Keyword(s):  
Continental Shelf ◽  
Sea Level ◽  
Wind Stress ◽  
Atmospheric Pressure ◽  
Shelf Waves ◽  
Continental Shelf Waves

Continental shelf waves and their influence on the circulation around the Great Barrier Reef

1983 ◽  
Vol 34 (1) ◽  
pp. 23 ◽  
Author(s):  
E Wolanski ◽  
AF Bennett
Keyword(s):  
Continental Shelf ◽  
Great Barrier Reef ◽  
Sea Level ◽  
Atmospheric Pressure ◽  
Low Frequency ◽  
Internal Tides ◽  
Wind Component ◽  
Barrier Reef ◽  
Longshore Current ◽  
Shelf Waves

Winds and atmospheric pressure, sea level and water currents were measured at several locations over the continental shelf, both east and west of the Great Barrier Reef, between 14.5�s. and 20�S., from June to November 1980. The dominant wind direction changed from westward over the Coral Sea to north- westward (roughly parallel to the shore) over the shelf. A strong non-tidal low-frequency signal in all sea- level and longshore current data was found, highly coherent from site to site and strongly correlated with the longshore wind component over the shelf, though not with the atmospheric pressure. A model of wind- driven barotropic shelf waves is used to explain a number of observations, such as the invariance of temporal fluctuations of longshore current with distance from shore, and the northward longshore propagation of oceanic disturbances at a speed equal to twice that of the first-mode barotropic free shelf wave, a speed one order of magnitude smaller than that of the wind system. The low-frequency current fluctuations resulted in large water displacements, up and down the coast. Low-frequency cross-shelf currents were much weaker and less coherent. Two upwelling mechanisms are internal tides and internal Kelvin waves coupled to the barotropic shelf waves.

scholarly journals Localised continental shelf waves: geometric effects and resonant forcing

2015 ◽  
Vol 785 ◽  
pp. 54-77 ◽  
Author(s):  
J. T. Rodney ◽  
E. R. Johnson
Keyword(s):  
Continental Shelf ◽  
Depth Profile ◽  
Wind Stress ◽  
Local Maximum ◽  
Far Field ◽  
Maximum Frequency ◽  
Offshore Structure ◽  
Shelf Wave ◽  
Shelf Waves ◽  
Continental Shelf Waves

Alongshore variations in coastline curvature or offshore depth profile can create localised regions of shelf-wave propagation with modes decaying outside these regions. These modes, termed localised continental shelf waves ($\ell$CSWs) here, exist only at certain discrete frequencies lying below the local maximum frequency, and above the far-field maximum frequency, for propagating shelf waves. The purpose of this paper is to obtain these frequencies and construct, both analytically and numerically, and discuss $\ell$CSWs for shelves with arbitrary alongshore variations in offshore depth profile and coastline curvature. If the shelf curvature changes by a small fraction of its value over the shelf section of interest or an alongshore perturbation in offshore depth profile varies slowly over the same length scale then $\ell$CSWs can be constructed using WKBJ theory. Two subcases are described: (i) if the propagating region is sufficiently long that the offshore structure of the $\ell$CSW varies appreciably alongshore then the frequency and alongshore structure are found from a sequence of local problems; (ii) if the propagating region is sufficiently short that the alongshore change in offshore structure of the $\ell$CSW is small then the alongshore modal structure is given in an explicit, uniformly valid form. A separate asymptotic theory is required for curvature perturbations to shelves that are otherwise straight rather than curved. Comparison with highly accurately numerically determined $\ell$CSWs shows that both theories are extremely accurate, with the WKBJ theory having a significantly wider range of applicability. An idealised model for the generation of $\ell$CSWs is also suggested. A localised time-periodic wind stress generates an evanescent continental shelf wave in the far field of a localised mode where the coast is almost straight and the response on the shelf is obtained numerically. If the forcing frequency is close to that of an $\ell$CSW then the wind stress excites energetic motions in the region of maximum curvature, creating a significant localised response possibly far from the forcing region.

scholarly journals Hydraulic control of continental shelf waves

2021 ◽  
Vol 917 ◽  
Author(s):  
S. Jamshidi ◽  
E.R. Johnson
Keyword(s):  
Continental Shelf ◽  
Hydraulic Control ◽  
Shelf Waves ◽  
Continental Shelf Waves

Abstract

Corrigendum to “Continental shelf waves on the Alborán sea” [Cont. Shelf Res. 111 (2015) 1–8]

2016 ◽  
Vol 127 ◽  
pp. 43
Author(s):  
M.A. Serrano ◽  
M. Díez-Minguito ◽  
M. Ortega-Sánchez ◽  
M.A. Losad
Keyword(s):  
Continental Shelf ◽  
Alboran Sea ◽  
Shelf Waves ◽  
Continental Shelf Waves ◽  
Alborán Sea
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