Fieldwork in Cabras Lagoon, Sardinia

BRAD deployed in Cabras Lagoon

Prof Carl L. Amos and PhD student Hachem Kassem, from the coastal processes research group at NOCS/University of Southampton (and former MSC ECE student), have recently participated in a scientific field campaign in the Cabras Lagoon, Sardinia, Italy. The work was undertaken within RITMARE, the Italian National programme of scientific and technological marine research; through sub-project 3, Work Package 4, Action 5;  WP4.A5 on hydrodynamic and morphodynamic modelling of lagoon systems in association with ISMAR (Institute of Marine Science) and IAMC (Institute for Coastal Marine Environment) both of the National Research Council (CNR) of Italy.

The work saw  11 deployments of the Benthic Roughness Acoustic Device (BRAD), a motorized frame-mounted Sediment Imaging Sonar (SIS) used to scan acoustically the water column for particulate matter in suspension, and bed roughness, providing a 3D  image (1.7 sq.m area) of varying seabed types across the main lagoon inlets/channels. Also fitted to the frame were 2 Acoustic Doppler Velocimeters (ADVs) offset vertically to measure the 3D structure of turbulence  near and above the bed, and a combined CTD/PT unit logging continuously conductivity, temperature (Salinity), and pressure. Water sampels were collected repeatedly at various elevations during each run, to ensure later calibration of the backscatter echograpms given by the sonar.The UoS team also deployed three Valeport 808 Units across the lagoon, logging currents and waves, and turbidity at 40 cm above the bed. Meanwhile, the ISMAR/IAMC teams deployed a series of drifters to record Lagrangian currents along the lagoon (compared very well with Andrea Cucco’s model of the lagoon through SHYFEM), as well several S4 sensors, and carried out a series of ADCP transects across and along the lagoon.

Hachem and Prof Carl attach an ADV to BRAD
Two Valeports triggered and ready for deployment (also, the bosses, from left:: Andrea Cucco(IAMC), Carl Amos (OES) and Georg Umgiesser (ISMAR, and project leader))
Programmed and ready to go
Heading to site
work on BRAD
Hachem Sampling water and taking underwater images
Brad being deployed (great help from Fabio and Goeff)
On the way to the sampling point
ISMAR team ready for another ADCP transect
Data being backed up at night.
Carl displays a common feature of the seabed.
BRAD at Work
The Drifters
Fabio takes some photos of the seabed
Final day, enjoying some last glimpses of mediterannean sunshine at the camp site, before heading back home.
The Scolmatore Channel

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