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The GFV-System (Groundwater Flow Visualization) is based on the visualisation and tracking of naturally occuring
suspended particles in the groundwater. These particles serve as natural tracers for flow velocity and direction. Via a camera system the particle drift is continously transmitted to
a computer wich directly evaluates pictures and data. The results are immediately displayed on the monitor. The method can be used in any depth within screened wells.The GFV-System consists of a measuring probe and a
computer unit. The probe includes a double packer, two independent measuring sections with cameras, and an extra borehole camera. The borehole camera observes the state of the filter screens and locates the well casing junctions.
The observation of the two measuring cameras is focused on a measuring area in the center of the respective section. It registers continuously and in detail any drift movements of
the material carried along by the groundwater; naturally or artificially generated flow deviations can be determined within seconds.
The employed optics guarantee a reliable recording of display
data, even in cloudy water and low currents.
The measuring data are graphically represented as direction plots, rate plates and plots of amount of suspended material. The GFV-System measures flow velocities from 10-2
to 10-7 m/s. |
