Measurement techniques and instruments

An overview of the main types of measurements that we can perform follows. Depending on the project requirements and in consultation with the customer, we determine the most appropriate combination of measurement techniques, frequency, duration and sensors. Flanders Hydraulics Research is not committed to a specific manufacturer or supplier for the purchase of measuring instruments. Furthermore, we personally develop specific instruments that are not available on the market. 

Measurements in situ

For in situ measurement campaigns, Flanders Hydraulics Research possesses the expertise necessary to carry out the entire process: from exploration of the measurement locations, organisation and preparation of the campaign, through the mobilisation, implementation and demobilisation, to the delivery of data (including a factual data report). We use an extensive set of high-tech measuring equipment, including:

  • equipment to measure the flow rate and direction: various types of Acoustic Doppler Current Profilers (ADCP), Acoustic Doppler Velocimeters (ADV) and electromagnetic velocitymeters;Q-liner
  • instruments to measure the water level and wave run-up (acoustic and pressure);
  • turbidity, pressure, conductivity, oxygen and temperature sensors;
  • various equipment for sampling water and other materials;
  • RTK-GPS for height and position determination;
  • measuring frames to place on the sea/river bed;
  • positioning system for ship motions;
  • angle sensors and rotational speed indicators;
  • high-definition cameras.

Flanders Hydraulics Research also provides advice on specialised measurements carried out in situ to#Boven identify silt layers and properties. We guide customers in using the right geophysical measuring devices and correctly evaluating the data obtained. These include the following equipment:

  • acoustic bathymetric equipment (single-beam and multi-beam);
  • in situ density profiling equipment;
  • rheological equipment. 

Measurements on physical modelsnaar boven

To perform measurements on scale models and other equipment at Flanders Hydraulics Research, we determine the most appropriate instrument choice and method. This is based on the parameters to be measured and the available measurement space on the model. The possible measuring instruments include:

  • electromagnetic and acoustic velocimeters and discharge meters;activiteiten in de hal
  • pressure sensors for static or dynamic pressure;
  • wave gauges;
  • laser position meters;
  • total station and electronic levelling equipment;
  • angle sensors and rotational speed indicators;
  • force sensors;
  • water level gauges;
  • calibration devices for control and measurement signals and strain gauges;
  • vision systems including Particle Tracking Velocimetry measurements;
  • custom-made measuring instruments for specific applications. 

Laboratory analyses

We most frequently perform the following analyses in our sedimentological laboratory:Sedimentlabo_3

  •  grain size distribution;
  • determination of rheological characteristics;
  • density determination;
  • determination of lime and organic content, sediment concentration, salinity and Cl content.

We have devices to determine the dry matter content, the loss on ignition and the sintering of samples. For an automated determination we use a PrepAsh, for a manual analysis we use a drying oven and a muffle furnace. With the automatic filtration machine that was developed in-house, we can determine said contents on water samples. Furthermore the sedimentological laboratory has an ion chromatograph and equipment for lyophilisation and making digital microphotographs with a light microscope and a scanning electron microscope. The latter is also equipped with an energy-dispersive X-ray spectroscope for elemental analysis of samples.

In the sedimentological laboratory we conduct innovative project-based research and laboratory analyses, including light and electron microscopy using EDX and the option to include digital micrographs.naar boven

Measuring team FHR-HIC