A heat-pulse flowmeter for measuring minimal discharge rates in boreholes
The U.S. Geological Survey has tested a borehole-configured heat-pulse flowmeter which has good low-velocity flow-measuring sensitivity. The flowmeter was tested in the laboratory in 51-, 102-, and 152-millimeter-diameter columns using water velocities ranging from 0.35 to 250 millimeters per second. The heat-pulse flowmeter also was tested in a 15-meter-deep granite test pit with controlled water flow, and in a 58-meter-deep borehole in sedimentary materials. The flowmeter's capability to detect and measure naturally occurring, low-velocity, thermally induced convection currents in boreholes was demonstrated. Further improvements to the heat-pulse-flowmeter system are needed to increase its reliability and improve its response through four-conductor logging cable.
Citation Information
Publication Year | 1982 |
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Title | A heat-pulse flowmeter for measuring minimal discharge rates in boreholes |
DOI | 10.3133/ofr82699 |
Authors | A.E. Hess |
Publication Type | Report |
Publication Subtype | USGS Numbered Series |
Series Title | Open-File Report |
Series Number | 82-699 |
Index ID | ofr82699 |
Record Source | USGS Publications Warehouse |