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dotOcean GraviProbe 2.0

The GraviProbe is a free fall impact instrument, analyzing the underwater sediment layers during intrusion. Under its own weight it accelerates and penetrates fluid and consolidated mud layers. The geotechnical and density conditions of the soil laye

  • dotOcean  GraviProbe 2.0
dotOcean
Gistelsesteenweg 294, b205
8200 Brugge
Belgium
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Description

The GraviProbe is a free fall impact instrument, analyzing the underwater sediment layers during intrusion. Under its own weight it accelerates and penetrates fluid and consolidated mud layers. The geotechnical and density conditions of the soil layers are determining the probe’s dynamical behavior. The data acquired from on-board accelerometers, inclinometers and pressure sensors is feeding a dynamical model which determines the geotechnical parameters of the intruded medium (depth, undrained shear strength and dynamic cone penetration resistance). As a result the GraviProbe is able to very accurately distinguish the depth of the fluid mud and consolidated mud layers, even in gassy environments. The high sensor data acquisition rates of up to 2kHz in combination with a low drag housing results in the highest quality profiles at drop rates over 7 m/s. Due to its light weight the probe can be operated manually from a small vessel, platform or quay and is limiting the operational costs. The GraviProbe Rheology provides tip resistance and shear strength. The GraviProbe Soil is similar to the GraviProbe Rheology but has a conus extension to penetrate hard an stiff sediment layers.

Specifications

  • Product type
    Free fall penetrometer
  • Year of initial development
    2010
  • Application
    High Resolution
  • Max power consumption [W]
    2
  • Power type
    DC
  • Transducer weight [kg]
    0
  • Transducer length [m]
    1
  • Transducer width [m]
    0.1
  • Transducer height [m]
    0.1
  • Weight of logging unit [kg]
    8
  • Length of logging unit [m]
    0.9
  • Width of logging unit [m]
    0.05
  • Height of logging unit [m]
    0.05
  • Portability of logger
    Portable
  • Components to be used in combination with product
    GPS
  • Platform type
    Side Mounted
  • Operating System
    Other
  • Min. depth of operation [m]
    4
  • Max. depth of operation [m]
    150
  • Power output [W]
    0
  • Max. resolution [m]
    0.01
  • Max. penetration [m]
    6
  • Max. pulse rate [Hz]
    0
  • Max. pulse length [s]
    0
  • Dynamic range [dB]
    0
  • Pitch corrected
    Y
  • Roll corrected
    Y
  • Heave corrected
    Y
  • Remote operation
    Y
  • External heave input
    N
  • External roll input
    N
  • External pitch input
    N
  • External positioning input
    Y
  • Marking of events
    Y
  • Real time coupling to survey software
    Y
  • Coupling to post-processing software
    Y
  • Data displayed
    Acceleration (m/s²)Velocity (m/s) Dynamic Undrained Shear Strength (Pa)Static Undrained Shear Strength (Pa)Dynamic Cone Penetration Resistance (Pa)
  • Main use
    Classification of mud and soil layersDetermination of nautical depthHigh accurate layer thickness measurementCalculating dredging volumesCharacterizing echo sound and acoustic dataComplementary soil analysis during CPT and core sampling
  • Data output
    Processed by GraviProbe software or uploaded in other survey software.
  • Formats
    Any
  • Data output for seafloor classification
    Y
  • Internal logging
    Hard drive
  • Post-processing
    GraviProbe software or dotOcean Atlantis (web-based platform) or other programs.

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