Longshore pressure gradients caused by offshore wind

Csanady, G. T.

doi:10.1029/jc085ic02p01076

Cited by 64 publications

(6 citation statements)

References 9 publications

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“…This probably explains the increase of the along‐shelf flow shown after the wind‐jet (Figure ) related to the transient set‐down near the coast. In this sense, Csanady () showed that strong cross‐shore wind can generate substantial along‐shelf flow due to the presence of a trapped pressure field on the inner shelf.…”

Section: Discussionmentioning

confidence: 99%

Shelf Circulation Induced by an Orographic Wind Jet

et al. 2017

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The dynamical response to cross‐shelf wind‐jet episodes is investigated. The study area is located at the northern margin of the Ebro Shelf, in the Northwestern (NW) Mediterranean Sea, where episodes of strong northwesterly wind occur. In this case, the wind is channeled through the Ebro Valley and intensifies upon reaching the sea, resulting in a wind jet. The wind‐jet response in terms of water circulation and vertical density structure is investigated using a numerical model. The numerical outputs agree with water current observations from a high‐frequency radar. Additionally, temperature, sea level, and wind measurements are also used for the skill assessment of the model. For the wind‐jet episodes, the numerical results show a well‐defined two‐layer circulation in the cross‐shelf direction, with the surface currents in the direction of the wind. This pattern is consistent with sea level set‐down due to the wind effect. The comparison of the vertical structure response for different episodes revealed that the increase of stratification leads to an onshore displacement of the transition from inner shelf to mid‐shelf. In general, the cross‐shelf momentum balance during a wind‐jet episode exhibits a balance between the frictional terms and the pressure gradient in shallow waters, shifting to a balance between the Coriolis force and the wind stress terms in deeper waters.

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Section: Discussionmentioning

confidence: 99%

Shelf Circulation Induced by an Orographic Wind Jet

et al. 2017

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“…Storms with their center moving along the northern coast of the Mid-Atlantic Bight are infrequent, but they do occur, and allow under favorable circumstances a study of cross-shore wind effects more or less in isolation. Such a storm was fortuitously observed during a series of coastal current studies off the south coast of Long Island (Csanady, 1980). On this occasion a storm center passed eastward along the Long Island coast and was followed by a strong offshore wind stress impulse (0.6 Pa).…”

Section: Effects Of Cross-shore Windsmentioning

confidence: 96%

Circulation in the Coastal Ocean

Csanady¹

1982

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312

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“…Despite the relatively limited fetch in the wind jet region, the wave height can be relevant, interacting with bimodal features (Shimada and Kawamura, 2006). In this sense, several contributions have highlighted the influence of variable wind conditions in relatively smallscale areas (such as wind jet), influencing wind-wave generation (Shimada and Kawamura, 2006;Bolaños-Sanchez et al, 2007;Alomar et al, 2014) or modifying ocean circulation patterns (Csanady, 1980;Zhai and Bower, 2013;Schaeffer et al, 2011;Klaić et al, 2011).…”

Section: Introductionmentioning

confidence: 99%

Ocean–atmosphere–wave characterisation of a wind jet (Ebro shelf, NW Mediterranean Sea)

Grifoll

Navarro

Pallarés

et al. 2016

Nonlin. Processes Geophys.

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Abstract. In this contribution the wind jet dynamics in the northern margin of the Ebro River shelf (NW Mediterranean Sea) are investigated using coupled numerical models. The study area is characterised by persistent and energetic offshore winds during autumn and winter. During these seasons, a seaward wind jet usually develops in a ∼ 50 km wide band offshore. The COAWST (Coupled Ocean-Atmosphere-Wave-Sediment Transport) modelling system was implemented in the region with a set of downscaling meshes to obtain high-resolution meteooceanographic outputs. Wind, waves and water currents were compared with in situ observations and remote-sensingderived products with an acceptable level of agreement. Focused on an intense offshore wind event, the modelled wind jet appears in a limited area offshore with strong spatial variability. The wave pattern during the wind jet is characterised by the development of bimodal directional spectra, and the ocean circulation tends to present well-defined twolayer flow in the shallower region (i.e. inner shelf). The outer shelf tends to be dominated by mesoscale dynamics such as the slope current. Due to the limited fetch length, ocean surface roughness considering sea state (wave-atmosphere coupling) modifies to a small extent the wind and significant wave height under severe cross-shelf wind events. However, the coupling effect in the wind resource assessment may be relevant due to the cubic relation between the wind intensity and power.

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Longshore pressure gradients caused by offshore wind

Cited by 64 publications

References 9 publications

Shelf Circulation Induced by an Orographic Wind Jet

Shelf Circulation Induced by an Orographic Wind Jet

Circulation in the Coastal Ocean

Ocean–atmosphere–wave characterisation of a wind jet (Ebro shelf, NW Mediterranean Sea)

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