Sediment dynamics on the outer-shelf of the Gulf of Lions during a storm: An approach based on acoustic glider and numerical modeling

Gentil, Mathieu; Estournel, Claude; Madron, Xavier Durrieu de; Many, Gaël; Miles, Travis; Marsaleix, Patrick; Berné, Serge; Bourrin, François

doi:10.1016/j.csr.2022.104721

Cited by 4 publications

(3 citation statements)

References 83 publications

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“…Whereas the above observations on sediment dynamics are limited to shallow depths, gliders equipped with optical and acoustic sensors, deployed during storms and following cross-shore transects through the Gulf of Lion shelf, have found increases in suspended matter concentrations as far as the shelf break. Such increases impact the entire water column on the inner and mid-shelf with concentrations of a few tens of mg/L, and are limited to a ~30 m thick bottom nepheloid layer with concentrations of a few mg/L on the outer shelf (Bourrin et al, 2015;Gentil et al, 2022). By integrating the effect of successive storms, this transport could carry particulate matter from the Rhone's vicinity to the southwestern end of the Gulf of Lion (Gentil et al, 2022).…”

Section: Resuspension and Sediment Transportmentioning

confidence: 99%

“…Such increases impact the entire water column on the inner and mid-shelf with concentrations of a few tens of mg/L, and are limited to a ~30 m thick bottom nepheloid layer with concentrations of a few mg/L on the outer shelf (Bourrin et al, 2015;Gentil et al, 2022). By integrating the effect of successive storms, this transport could carry particulate matter from the Rhone's vicinity to the southwestern end of the Gulf of Lion (Gentil et al, 2022).…”

Section: Resuspension and Sediment Transportmentioning

confidence: 99%

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Sediment dynamics in the Gulf of Lion (NW Mediterranean Sea) during two autumn–winter periods with contrasting meteorological conditions

Estournel

Mikolajczak

Ulses

et al. 2023

Progress in Oceanography

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Section: Resuspension and Sediment Transportmentioning

confidence: 99%

Section: Resuspension and Sediment Transportmentioning

confidence: 99%

Sediment dynamics in the Gulf of Lion (NW Mediterranean Sea) during two autumn–winter periods with contrasting meteorological conditions

Estournel

Mikolajczak

Ulses

et al. 2023

Progress in Oceanography

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“…We rely here on the SYMPHONIE primitive-equation model which has been widely used in the study area at the nearshore (Michaud et al, 2012), coastal (Estournel et al, 2003;Mikolajczak et al, 2020;Petrenko et al, 2008) and regional (Estournel et al, 2016) scales. Validation studies of SYM-PHONIE currents over the Gulf of Lion have been carried out by comparison with various instruments on different hydrological structures and meteorological situations, specifically VHF radars on the Rhone plume , hull-mounted ADCP (Estournel et al, 2003) in prevailing northerly winds, fixed ADCP (Mikolajczak et al, 2020) and glider drift (Gentil et al, 2022) during easterly storms. SYMPHONIE is described in Marsaleix et al (2008Marsaleix et al ( , 2006 and in Damien et al (2017), with turbulence closure and convection parameterization detailed in Estournel et al (2016).…”

Section: Modelmentioning

confidence: 99%

Assessing the capability of three different altimetry satellite missions to observe the Northern Current by using a high-resolution model

et al. 2023

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Abstract. Over the last 3 decades, satellite altimetry has observed sea surface height variations, providing a regular monitoring of the surface ocean circulation. Altimetry measurements have an intrinsic signal-to-noise ratio that limits the spatial scales of the currents that can be captured. However, the recent progress made on both altimetry sensors and data processing allows us to observe smaller geophysical signals, offering new perspectives in coastal areas where these structures are important. In this methodological study, we assess the ability of three altimeter missions with three different technologies to capture the Northern Current (northwestern Mediterranean Sea) and its variability, namely Jason-2 (Ku-band low-resolution-mode altimeter, launched in 2008), SARAL/AltiKa (Ka-band low-resolution-mode altimeter, launched in 2013) and Sentinel-3A (synthetic aperture radar altimeter, launched in 2016). Therefore, we use a high-resolution regional model as a reference. We focus along the French coast of Provence, where we first show that the model is very close to the observations of high-frequency radars and gliders in terms of surface current estimates. In the model, the Northern Current is observed 15–20 km from the coast on average, with a mean core velocity of 0.39 m s−1. Its signature in terms of sea level consists of a drop whose mean value at 6.14∘ E is 6.9 cm, extending over 20 km. These variations show a clear seasonal pattern, but high-frequency signals are also present most of the time. In comparison, in 1 Hz altimetry data, the mean sea level drop associated with the Northern Current is overestimated by 3.0 cm for Jason-2, but this overestimation is significantly less with SARAL/AltiKa and Sentinel-3A (0.3 and 1.4 cm respectively). In terms of corresponding sea level variability, Jason-2 and SARAL altimetry estimates are larger than the model reference (+1.3 and +1 cm respectively), whereas Sentinel-3A shows closer values (−0.4 cm). When we derive geostrophic surface currents from the satellite sea level variations without any data filtering, in comparison to the model, the standard deviations of the velocity values are also very different from one mission to the other (3.7 times too large for Jason-2 but 2.4 and 2.9 times too large for SARAL and Sentinel-3A respectively). When low-pass filtering altimetry sea level data with different cutoff wavelengths, the best agreement between the model and the altimetry distributions of velocity values are obtained with a 60, 30 and 40–50 km cutoff wavelength for Jason-2, SARAL and Sentinel-3A data respectively. This study shows that using a high-resolution model as a reference for altimetry data allows us not only to illustrate how the advances in the performances of altimeters and in the data processing improve the observation of coastal currents but also to quantify the corresponding gain.

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Benthic sediment disturbances by episodic human-controlled discharge in an altered estuary

Jeong,

Ha,

Kim

et al. 2023

Marine Geology

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Sediment dynamics on the outer-shelf of the Gulf of Lions during a storm: An approach based on acoustic glider and numerical modeling

Cited by 4 publications

References 83 publications

Sediment dynamics in the Gulf of Lion (NW Mediterranean Sea) during two autumn–winter periods with contrasting meteorological conditions

Sediment dynamics in the Gulf of Lion (NW Mediterranean Sea) during two autumn–winter periods with contrasting meteorological conditions

Assessing the capability of three different altimetry satellite missions to observe the Northern Current by using a high-resolution model

Benthic sediment disturbances by episodic human-controlled discharge in an altered estuary

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