| 摘要 |
PROBLEM TO BE SOLVED: To estimate the flow conditions of ground water at low cost and with high accuracy in short times. SOLUTION: In a steel pipe 101 preparing a spiral blade 101a for digging at the apex circumferential surface, are prepared a coating nichrome wire (heater 102) wound on a core tube 03, a heat-insulating material 104, such as foam polystyrene placed in the core tube 103, and eight temperature sensors 105 and the like, arranged spaced equally at a fixed height position of internal surface of the steel pipe 101 are prepared. When the temperature changeΔT at a certain measuring point (a certain thermocouple) is the largest and the temperature changeΔT at another measuring point (thermocouple) facing that is smallest, the certain measuring point and the other measuring point are estimated to locate at downstream and upstream side of flowing direction of groundwater, respectively. COPYRIGHT: (C)2008,JPO&INPIT
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