scholarly journals The importance of spatial variability in the generation of secondary gravity waves from local body forces

2002 ◽  
Vol 29 (20) ◽  
pp. 45-1-45-4 ◽  
Author(s):  
Sharon L. Vadas ◽  
David C. Fritts
Keyword(s):  
Spatial Variability ◽  
Gravity Waves ◽  
Body Forces ◽  
Local Body

scholarly journals The Excitation of Secondary Gravity Waves From Local Body Forces: Theory and Observation

2018 ◽  
Vol 123 (17) ◽  
pp. 9296-9325 ◽  
Author(s):  
Sharon L. Vadas ◽  
Jian Zhao ◽  
Xinzhao Chu ◽  
Erich Becker
Keyword(s):  
Gravity Waves ◽  
Body Forces ◽  
Local Body

scholarly journals Diagnosing surfzone impacts on inner-shelf flow spatial variability using realistic model experiments with and without surface gravity waves

2021 ◽  
Author(s):  
Xiaodong Wu ◽  
Falk Feddersen ◽  
Sarah N. Giddings
Keyword(s):  
Spatial Variability ◽  
Gravity Waves ◽  
Realistic Model ◽  
Surface Gravity ◽  
Rip Currents ◽  
Inner Shelf ◽  
Surface Gravity Waves ◽  
Eddy Transport ◽  
Generation Mechanisms ◽  
Shelf Flow

AbstractRip currents are generated by surfzone wave breaking and are ejected offshore inducing inner-shelf flow spatial variability (eddies). However, surfzone effects on the inner-shelf flow spatial variability have not been studied in realistic models that include both shelf and surfzone processes. Here, these effects are diagnosed with two nearly identical twin realistic simulations of the San Diego Bight over summer to fall where one simulation includes surface gravity waves (WW) and the other that does not (NW). The simulations include tides, weak to moderate winds, internal waves, submesoscale processes, and have surfzone width Lsz of 96(±41) m (≈ 1 m significant wave height). Flow spatial variability metrics, alongshore root mean square vorticity, divergence, and eddy cross-shore velocity, are analyzed in a Lsz normalized cross-shore coordinate. At the surface, the metrics are consistently (> 70%) elevated in the WW run relative to NW out to 5Lsz offshore. At 4Lsz offshore, WW metrics are enhanced over the entire water column. In a fixed coordinate appropriate for eddy transport, the eddy cross-shore velocity squared correlation betweenWWand NW runs is < 0.5 out to 1.2 km offshore or 12 time-averaged Lsz. The results indicate that the eddy tracer (e.g., larvae) transport and dispersion across the inner-shelf will be significantly different in the WW and NW runs. The WW model neglects specific surfzone vorticity generation mechanisms. Thus, these inner-shelf impacts are likely underestimated. In other regions with larger waves, impacts will extend farther offshore.

scholarly journals Global distributions of overlapping gravity waves in HIRDLS data

2015 ◽  
Vol 15 (4) ◽  
pp. 4333-4382 ◽  
Author(s):  
C. J. Wright ◽  
S. M. Osprey ◽  
J. C. Gille
Keyword(s):  
Spatial Variability ◽  
Gravity Wave ◽  
Gravity Waves ◽  
Spectral Characteristics ◽  
Small Scale ◽  
Spectral Form ◽  
Temporal And Spatial Variability ◽  
Abstract Data ◽  
Temporal And Spatial ◽  
Wave Phenomena

Abstract. Data from the HIRDLS instrument on NASA's Aura satellite are used to investigate the relative numerical variability of observed gravity wave packets as a function of both horizontal and vertical wavenumber, with support from the SABER instrument on TIMED. We see that these distributions are dominated by small vertical and large horizontal wavenumbers, and have a similar spectral form at all heights and latitudes, albeit with important differences. By dividing our observed wavenumber distribution into particular subspecies of wave, we demonstrate that these distributions exhibit significant temporal and spatial variability, and that small-scale variability associated with particular geophysical phenomena such as the monsoon arises due to variations in specific parts of the observed spectrum. We further show that the well-known Andes/Antarctic Pensinsula gravity wave hotspot during southern winter, home to some of the largest wave fluxes on the planet, is made up of relatively few waves, but with a significantly increased flux per wave due to their spectral characteristics. These results have implications for the modelling of gravity wave phenomena.

Spatial variability induces generalization in contextual cueing.

2020 ◽  
Vol 46 (12) ◽  
pp. 2295-2313
Author(s):  
Yoko Higuchi ◽  
Yoshiyuki Ueda ◽  
Kazuhisa Shibata ◽  
Jun Saiki
Keyword(s):  
Spatial Variability ◽  
Contextual Cueing
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