Hydrography
The Hydrographic Electrical Resistivity & Bathymetry Imager (HERBI) developed in Dr David Allen’s PhD is owned and operated by Groundwater Imaging. We also sell systems applying this technology. The system conducts Electrical Resistivity Tomography (ERT) continually while being towed in water bodies such as reservoirs, dams, rivers, drains, swamps and irrigation channels. For corrections needed in the ERT, water depth must be acquired so we collect full bathymetric datasets and use precision GNSS to position data and get water level elevation. HERBI survey has also involved collection of pH, temperature and EC of water used in Run of River and drain surveys to detect where groundwater inflows.
We have conducted soundings of water column parameters EC and temperature by combining pressure and EC sensors and plotting in 3D using our EC imaging software. This may be combined with our sludge sampling and optically obtained turbidity (NIR backscatter) or Total Suspended Solids (transmitted near infrared) measurements.
Dr David Allen also has studied various methods of measuring open channel flow.
