Oceanography

Measurement of the physicochemical elements

Principle

Several parameters define water masses such as:

  • Temperature
  • Pressure
  • Salinity
  • pH
  • Dissolved oxygen
  • Turbidity

Every parameter, pertaining to a definite context, is measured with a specific probe and technology (electrode cells, light beam…).

Implementation and data processing

Multi-parameters probes are operated following two methodologies :

  • Survey from a vessel or a mobile (rov, auv, slocum glider...) for spatially located data sampling.
  • Static recording with a sensor fixed to a support : quay, surface buoy, mooring line...

Data can be recovered by direct reading or recorded in the probe memory. This long term continuous monitoring is performed trough the connection of the multi-parameter probe to an external data logging system.

That configuration allows then to retrieve data remotely (by wireless modem connections), or to manage alarms according to thresholds (e.g to trigger a sampler).

The data can be displayed as profiles, charts, graph or data base.

Application

  • Turbidity monitoring within environmental studies related to marine work.
  • Quality of water: site surveys (harbour, oufall, beaches, lakes, dams...).
  • Méditerranean sea monitoring and protection against land borne pollutions.
  • Studies of salinity and temperature of water masses related to location and time.
  • Supply of requested data to validate a digital model , in order to quantify the improvements on the environment of a discharge new managements .
  • Monitoring of underground water table levels and surface waters.