OBSEA

Share:

Project title and acronym    

Shallow Water Hydrophone Array long term Deployment (SWHAD)

Host facility    

OBSEA 

Modality of Access    

MoA2 – Partially remote (the presence of the user is required at some stage, e.g. for installing and uninstalling an instrument)

Description  

The missions are devoted to the following scientific and technical objectives

  • Define the best position and geometry of the array to get the best deployment according to the type of measurement
  • Verify proper functioning of the system
  • Set up the acoustic measurement parameters
  • Verify resistance to environmental agents
  • Validate acoustic measurement of different acoustic source
  • Measure hydrophones real performances in shallow water environment
  • Validate hydrophones real performance vs. targeted

Project title and acronym

Upwelling characterization with autonomous underwater vehicle (upAUV)

Host facility

OBSEA

Modality of Access

MoA3 – In-person (the presence of the user is required/ recommended during the whole access period)

Description

Autonomous Underwater Vehicles (AUVs) are being incorporated to Ocean Observing Systems worldwide as multisensory platforms capable of high spatiotemporal resolution sampling. Propelled AUVs, such as CSIC’s Iver2 AUVs, often incorporate Doppler (DVL) sensors for accurate underwater navigation (no GPS available). These sensors can also perform current profiling (ADCP), although their measures’ accuracy has not been thoroughly studied. Underwater gliders (more widespread than propelled AUVs) are now being installed ADCPs for current profiling. These gliders need to navigate with pitch (nose inclination) values ranging from 15-30º, which may yield erroneous current measurement values.

One of the objectives of the experiments is to evaluate the measurements of the AUV (provided by CSIC) by comparing against a moored ADCP (OBSEA). The AUV should navigate at different pitch angles, speeds, on the surface,… in order to identify what navigation modes are valid for using AUVs as current measurement instruments.

The other objective is to characterize the currents during upwelling processes that occur in the area in springtime [J. Antonijuan et al., 2015]. The AUV or AUVs (CSIC can operate 2 AUVs at a time) could provide a different perspective of the process as now it has been studied only with one moored ADCP (OBSEA). The AUVs, sampling at 1Hz and moving at speeds of 2 m/s could provide a high resolution and fairly synoptic currents map of the area.


Project title and acronym

Currentmeter intercomparison in a shallow water Environment (CISWE)

Host facility

OBSEA

Modality of Access

MoA2 – Partially remote (the presence of the user is required at some stage, e.g. for installing and uninstalling an instrument)

Description

Nortek has developed new technology called AD2CP and registered under the patent US 20080289433 A1. Nortek instruments are well recognized worldwide for their reliability and high accuracy, so the transition to the new product line must be supported by a number of test and inter comparisons.

Many of them are already done near the manufacturing facilities (Oslo, Norway), but as long as these instruments will be supplied all around the world, the different test have to be done in a wide spectrum of measurement sites.

Obsea observatory fulfills the requirements for one of the projected tests. The temperature in the Mediterranean area is higher, waves are shorter and currents are lower (under 0.2 m/s)