We currently have two ongoing projects. One project focuses on the physical oceanography and meteorology of coastal Georgia as part of the GCE-LTER network, and the other project focuses on hydrothermal vents near the Juan de Fuca Ridge as part of Ocean Networks Canada.

 

1) Coastal Georgia: This project is part of the Georgia Coastal Ecosystems Long Term Ecological Research Network (GCE-LTER) (see our link on GCE-LTER: https://gce-lter.marsci.uga.edu/public/app/personnel_bios.asp?id=ddiiorio) through the National Science Foundation since 2000. Much of the data collection began in 2001 and continues to present. This includes sea level, meteorological, and hydrographic data at various locations in the GCE domain. Most of this data is currently available for download (at: https://gce-lter.marsci.uga.edu/), while some is still in the processing stages. Our team is also focused on modeling the physical parameters of the Duplin River (near Sapelo Island, GA) to understand the exchange between ocean and estuary; this model is forced by observed data collected under the GCE-LTER project.

 

Our most recent addition to the project is the deployment a horizontal ADCP (HADCP) to monitor the real time flow of the Duplin River on timescales from tidal to decadal. Our December 2016 deployment of the HADCP was successful, real-time Duplin River velocity data are being monitored currently (unless the system is down for maintenance). See: http://gce-lter.marsci.uga.edu/portal/stations/gce_adcp/index.xml

Here is a slideshow video of the HADCP's initial installation: https://www.dropbox.com/s/jhwbx39653g1opw/HADCPdeploymentvideo.mov?dl=0

Dublin River

HADCP

Positioning

Clean HADCP

Plot

2017

2017

 

 

2) Juan de Fuca Ridge: Our group is part of the Ocean Networks Canada, previously known as NEPTUNE Canada (see: http://www.oceannetworks.ca/). For this project, the technology of FASS has been vastly improved (through the help of ASL Environmental Sciences) with two major modifications. This instrument now uses reciprocal acoustic transmission at two separate vertical levels and will be permanently cabled to the seafloor near the Main Endeavor vent field offshore of the southern region of Vancouver Island, BC. The primary advantage of reciprocal transmission is the ability to resolve both vertical buoyant flows and horizontal advective flows, as well as improving turbulence measurements and speed of sound estimations. Being permanently cabled, battery life or data storage are no longer a concern.  These acoustic measurements are essential for developing accurate and realistic 3-D models of hydrothermal vent plumes and their interaction with the ambient ocean.

Update: 24 Jan 2020: The production of the new FASS system has proved to be an engineering challenge; however, it is currently in the final stages of production and testing. We are hoping for a 2020 deployment. We anticipate an ocean test soon, this will allow us to operate the instrument with the transducers separated at a distance similar to final deployment conditions. 

 

Recent Completed Projects:

1) Gulf of Mexico: Our group is part of the Gulf of Mexico Research Initiative (GoMRI). “The ultimate goal of the GoMRI will be to improve society’s ability to understand, respond to and mitigate the impacts of petroleum pollution and related stressors of the marine and coastal ecosystems, with an emphasis on conditions found in the Gulf of Mexico.” (see our groups link on GoMRI: http://research.gulfresearchinitiative.org/research-awards/projects/?pid=270)

 

See Daniela on youtube talking about our work in GOM: (https://www.youtube.com/watch?v=OJv9j78Esuo&feature=youtu.be)

 

The abundance of hydrocarbons in Gulf of Mexico (GOM) makes this study site an exciting place to acquire knowledge regarding the relationship between underground hydrocarbons and physical oceanography. In Summer 2017 our goal is to deploy FASS, 4 and 5 beam ADCP’s and CTD’s on the sea floor of GOM where naturally occurring oils and methane gases are emitted. We will characterize the vertical upwelling velocity of gas hydrates and its role in vertical transport of methane and oil to the surface, as well as improve our understanding of horizontal and vertical dispersal processes in the turbulent bottom boundary layer by making time series measuring of 3-D velocity and hydrographic properties near naturally occurring seeps. Our instruments will be deployed and recovered within a period of ~90 days. If all goes as planned our group will produce the an in-situ time-series of vertical transport in a bubble plume rising from a natural seep. We will use a model, forced by these observed data, to investigate acoustic scattering theory to quantify the bubble plumes at hydrocarbon seeps. 

Update: 24 Jan 2020: Instruments were deployed in September 2017 and retrieved in January 2018. Rather than a methane seep as originally planned, we focused on an oily seep near the original Megaplume study site in the GC600 block. We deployed: 1) 2 deep water cameras to capture video of the oil seep, 2) 4 beam ADCP's with frequency of 300 and 600 kHz, 3) 2 - 40 m moorings with 5 CTD's placed at 9 meter intervals beginning at ~4 to 40 mab, and the 4) Acoustic Scintillation Flow Meter to measure the vertical velocity of the oily plume. Unfortunatetly, we were not able to deploy our new 5 beam ADCP. An AUV was used to identify/view the study site, it was equipped with side-scan, multi-beam, and a sub-bottom profiler. Data has been archived with GoMRI ( https://research.gulfresearchinitiative.org/research-awards/projects/?pid=270 ).