A heat-pulse flowmeter for measuring minimal discharge rates in boreholes
Open-File Report
82-699
By: A.E. Hess
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Abstract
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.
| Publication type | Report |
|---|---|
| Publication Subtype | USGS Numbered Series |
| Title | A heat-pulse flowmeter for measuring minimal discharge rates in boreholes |
| Series title | Open-File Report |
| Series number | 82-699 |
| DOI | 10.3133/ofr82699 |
| Edition | - |
| Year Published | 1982 |
| Language | ENGLISH |
| Publisher | U.S. Geological Survey, |
| Description | iv, 44 p. ill. ;28 cm. |
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