Along‐shelf current variability on the Catalan inner‐shelf (NW Mediterranean)

Grifoll, Manel; Aretxabaleta, Alfredo L.; Espino, Manuel; Warner, John C.

doi:10.1029/2012jc008182

Cited by 23 publications

(57 citation statements)

References 47 publications

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“…In the present study, we focus on a subset of the data analyzed by Grifoll et al (2012) that includes an energetic event lasting a few days during March 2011. The bulk of the measurements correspond to a field experiment conducted over the Catalan inner shelf in the framework of the FIELD_AC project (Grifoll et al, 2012).…”

Section: Site Location Data and Methodsmentioning

confidence: 99%

“…The bulk of the measurements correspond to a field experiment conducted over the Catalan inner shelf in the framework of the FIELD_AC project (Grifoll et al, 2012). The data set consisted of velocity time series from three Acoustic Doppler Current Profiler (ADCP) deployments, each with a pressure sensor (A1 [AWAC], A2 [AWAC] and A3 [RDI]; Fig.…”

Section: Site Location Data and Methodsmentioning

confidence: 99%

“…The circulation over the inner shelf is often investigated through the analysis of the momentum balance in different regions, although most studies have usually focused on those conditions averaged over periods longer than 1 week (Lee et al, 1984;Lentz and Winant, 1986;Lentz et al, 1999, Maza et al, 2006Fewings and Lentz, 2010;Grifoll et al, 2012Grifoll et al, , 2013. In contrast, the analysis of the momentum terms at daily and shorter timescales under rapidly changing forcing conditions remains less explored.…”

Section: Introductionmentioning

confidence: 99%

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Temporal evolution of the momentum balance terms and frictional adjustment observed over the inner shelf during a storm

et al. 2016

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Abstract. We investigate the rapidly changing equilibrium between the momentum sources and sinks during the passage of a single two-peak storm over the Catalan inner shelf (NW Mediterranean Sea). Velocity measurements at 24 m water depth are taken as representative of the inner shelf, and the cross-shelf variability is explored with measurements at 50 m water depth. During both wind pulses, the flow accelerated at 24 m until shortly after the wind maxima, when the bottom stress was able to compensate for the wind stress. Concurrently, the sea level also responded, with the pressuregradient force opposing the wind stress. Before, during and after the second wind pulse, there were velocity fluctuations with both super-and sub-inertial periods likely associated with transient coastal waves. Throughout the storm, the Coriolis force and wave radiation stresses were relatively unimportant in the along-shelf momentum balance. The frictional adjustment timescale was around 10 h, consistent with the efolding time obtained from bottom drag parameterizations. The momentum evolution at 50 m showed a larger influence of the Coriolis force at the expense of a decreased frictional relevance, typical in the transition from the inner to the midshelf.

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Section: Site Location Data and Methodsmentioning

confidence: 99%

Section: Site Location Data and Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Temporal evolution of the momentum balance terms and frictional adjustment observed over the inner shelf during a storm

et al. 2016

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“…The coastal circulation is strongly shelf direction due to the coastal boundary constraint. The along fluctuations are basically controlled by wind stress at short time scales and by remote pressure synoptic time scales (Grifoll et al 2012). The goal of this paper is to relate land boundary fluxes to different plume discharges.…”

Section: Coastal Engineering 2012mentioning

confidence: 99%

“…In this study we use a numerical model to incorporate the land boundary fluxes into a coastal circulation model in the Catalan coast zone during spring 2011 (from March 1, 2011 to April 31, 2011) in the framework of the Field AC project (www.field_ac.eu).The Catalan Coast was chosen for this study because local (torrential) rainfall is considered to have a high impact on the quality of coastal waters and it is thus important to be able to predict the land discharge adequately such that it can be incorporated into the coastal scale oceanographic models (Keupers et al 2011). The study area, as many parts of the Mediterranean environment, is under strong anthropogenic pressure and requires in-depth knowledge of the marine environment for appropriate management (Grifoll et al 2012).…”

Section: Introductionmentioning

confidence: 99%

Incorporation of Continental and Urban Run-Off Into a Coastal Circulation Model: Application to the Catalan Coast

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Grifoll²,

Keupers³

et al. 2012

Int. Conf. Coastal. Eng.

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A 3D hydrodynamical model has been set up to incorporate the continental and urban run-off into the Catalan Coastal waters. Particular attention was paid to introducing correctly the freshwater plumes and attention was also paid to determinate the influence of the land discharge profile with regard to the distributed continental run-off. The model domain includes a small part of the Catalan Coast where the combination of local land topography with torrential rainfall caused considerable local runoff on a short period of time with a large impact on the receiving coastal waters. The Regional Ocean Modeling System (ROMS) simulations were used to examine the dispersal to a freshwater delivery from two relevant event; a low river discharge typical of mean conditions during April 2011 and a high discharge representative of the storm event during March 2011 are considered. We have observed the plume responses to an abrupt change in river discharge. During the mean conditions, low salinity water is concentrated around the rivers mouth while during the flood event, the plume spread offshore in the direction of river water outflow and turned downstream close to the coast. The differences between a simulation including the river outflow as a land forcing and a simulation including river and urban runoff as a land forcing suggested that the urban runoff plays an important role in the spreading and shape of the river plume.

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Formation of fine sediment deposit from a flash flood river in the Mediterranean Sea

et al. 2014

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We identify the mechanisms controlling fine deposits on the inner-shelf in front of the Besos River, in the northwestern Mediterranean Sea. This river is characterized by a flash flood regime discharging large amounts of water (more than 20 times the mean water discharge) and sediment in very short periods lasting from hours to few days. Numerical model output was compared with bottom sediment observations and used to characterize the multiple spatial and temporal scales involved in offshore sediment deposit formation. A high-resolution (50 m grid size) coupled hydrodynamic-wave-sediment transport model was applied to the initial stages of the sediment dispersal after a storm-related flood event. After the flood, sediment accumulation was predominantly confined to an area near the coastline as a result of preferential deposition during the final stage of the storm. Subsequent reworking occurred due to wave-induced bottom shear stress that resuspended fine materials, with seaward flow exporting them toward the midshelf. Wave characteristics, sediment availability, and shelf circulation determined the transport after the reworking and the final sediment deposition location. One year simulations of the regional area revealed a prevalent southwestward average flow with increased intensity downstream. The circulation pattern was consistent with the observed fine deposit depocenter being shifted southward from the river mouth. At the southern edge, bathymetry controlled the fine deposition by inducing near-bottom flow convergence enhancing bottom shear stress. According to the shortterm and long-term analyses, a seasonal pattern in the fine deposit formation is expected.

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Along‐shelf current variability on the Catalan inner‐shelf (NW Mediterranean)

Cited by 23 publications

References 47 publications

Temporal evolution of the momentum balance terms and frictional adjustment observed over the inner shelf during a storm

Temporal evolution of the momentum balance terms and frictional adjustment observed over the inner shelf during a storm

Incorporation of Continental and Urban Run-Off Into a Coastal Circulation Model: Application to the Catalan Coast

Formation of fine sediment deposit from a flash flood river in the Mediterranean Sea

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