Deployment of the fibre optical cable for long-term seepage monitoring at Winscar-Dam (United Kingdom)
IN SITU MEASUREMENT OF SEEPAGE FLOW VELOCITY
The most critical hydrodynamic parameter for material transportation phenomena by seeping water is the local pore velocity. Regions with high pore velocity are most likely prone to internal erosion. Up to now, critical pore velocities for the onset of internal erosion have been determined theoretically by using particle size distributions and measured hydraulic gradients. The applicability of theoretically calculated pore velocities is rather limited and in most cases questionable. In order to address this problem GTC® developed a temperature based method - the heat pulse method (HPM). With the HPM it is possible to determine pore velocities in the range from 10-7 m/s up to 10-3 m/s. Thus, allowing the in situ determination of this important hydrodynamical parameter for the first time.

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     - Heat-Pulse-Method (TSM4.pdf, 134kb)