MaRoLiS 2021

Name: MaRoLiS 2021
Start: 2021-07-11
End: 2021-07-18
Location: Ligurian Sea

Type	Oceanographic cruise
Ship	Pourquoi pas ?
Ship owner	Ifremer
Dates	11/07/2021 - 18/07/2021
Chief scientist(s)	GARZIGLIA Sébastien
	GEO-OCEAN - UMR 6538 Univ. Brest, CNRS, Ifremer, Univ. Bretagne Sud Place Nicolas Copernic 29280 Plouzané https://www.geo-ocean.fr/
DOI	10.17600/18002394
Objective	The works undertaken during the MaRoLiS 2021 cruise aimed at detecting the precursory signs and controlling factors of submarine landslides offshore Nice Aiport, as part of the French-german ANR DFG MODAL project. This implied the deployment of two piezometers to record over several years the fluid pressure and temperature within the upper five meters of sediments. In addition to these classical deployments, two prototypes of instrumented rods (TIPS) each of 50 m long were installed with the Penfeld penetrometer to measure over the same period of time the displacement of sediments along with their fluid pressure and temperature. Two piston cores of about ten meters long were also recovered to analyse the nature of the fluids and the physical properties of sediments as useful parameters to the interpretation of in situ measurements. The MaRoLiS 2021 cruise also contributed to the testing of the Penfeld penetrometer and of the deployment of gas sensors on a CTD/Rosette to prepare the GHASS2 cruise. In addition, as requested by GENAVIR, a survey was carried out to calibrate a gravimeter.

Sea/Ocean

Ligurian Sea

(Nice continental shelf)

Ports

Port of departure : La Seyne-sur-Mer (France)

Port of return : La Seyne-sur-Mer (France)

Limits

North	South	West	East
43.6	43.6	7.2	7.2

Project

EMSO - European Multidisciplinary Seafloor and Water Column Observatory

Scientific Authority

GEO-OCEAN - UMR 6538

Univ. Brest, CNRS, Ifremer, Univ. Bretagne Sud

Place Nicolas Copernic

29280 Plouzané

https://www.geo-ocean.fr/

Participating bodie(s)

Ifremer

Discipline(s)

MARINE GEOSCIENCES
PHYSICAL OCEANOGRAPHY
CROSS-DISCIPLINE

Code	Label	Quantity	PI
B64	Gear research Testing of piezocone sounding with the Penfeld at 3 deep water sites (~1150 m) and 3 shallow water sites (~20 m)	6 stations	GARZIGLIA Sébastien
B64	Gear research Deployment of methane and carbon dioxide sensors on a CTD Rosette	7 deployments	GARZIGLIA Sébastien
D71	Current profiler (eg ADCP)	-	GARZIGLIA Sébastien
D90	Other physical oceanographic meas.	-	GARZIGLIA Sébastien
G043	Piston corer Recovery of the upper 10 meters of sediment on the continental shelf offshore Nice Airport	2 cores	GARZIGLIA Sébastien
G27	Gravity measurements 2 race-track patterns and 1 line to calibrate the L&R Sea-3 gravimeter	292 kilometers	GARZIGLIA Sébastien
G71	In-situ seafloor meas. or sampling Piezometer installation to monitor pore fluid pressure and temperature of shelf sediment over more than a year	2 deployments	GARZIGLIA Sébastien
G711	Penetrometer Installation of 50 m long instrumented rods to measure the displacement, pore fluid pressure and temperature of shelf sediments over more than a year	2 deployments	GARZIGLIA Sébastien
G73	Single-beam echosounding	-	GARZIGLIA Sébastien
G74	Multi-beam echosounding Recording of water column data to identify fluid seeps on the continental shelf offshore Nice Airport	1 square kilometers	GARZIGLIA Sébastien
G75	Single channel seismic reflection	-	GARZIGLIA Sébastien
H71	Surface measurements underway (T,S) Thermosalinograph	8 days	GARZIGLIA Sébastien
M06	Routine standard measurements Mercury-Météo France: Wind speed and direction, Temperature/hygrometry, Sunshine	8 days	GARZIGLIA Sébastien

Positionning system

Geodetic system : WORLD GEODETIC SYSTEM 1984 = WGS84

Positioning system : GPS cinématique

Joint document(s)

ADCP DATA OF THE PP, YEAR 2021

Published data

Garziglia Sebastien, Roudaut Mickael, Ferrant Anthony, Chauvet Adrien, Guyavarch Pierre, Barbot Stephane (2023). Pressure and temperature data from piezometer MAR2-PZML-01 on EMSO-LIGURE NICE observatory, since July 2021. https://doi.org/10.17882/96265

Data managed by SISMER

Bibliography

Publications

Sultan Nabil , Garziglia Sebastien (2024). 3D stability analysis of submarine slopes: a probabilistic approach incorporating strain-softening behaviour. Landslides, 21(11), 2695-2709. Publisher's official version : https://doi.org/10.1007/s10346-024-02317-6 , Open Access version : https://archimer.ifremer.fr/doc/00901/101258/

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