OBSERVATION METHOD AND OBSERVATION DEVICE FOR UNDERGROUND WATER LEVEL AND UNDERGROUND WATER QUALITY

摘要

PROBLEM TO BE SOLVED: To provide an observation method and its observation device for underground-water level and underground-water quality, by which the observation of underground-water level and underground-water quality can be performed by the use of the same borehole, and the burden of cost at the time of drilling a borehole can be much more reduced compared with conventional methods. ;SOLUTION: A pair if conductors 4 spaced apart by an insulating material 5 to be parallel to each other, are arranged in a borehole 30 in the ground 12, and the end part of the conductors on the underground side is inserted into the underground-water 6 accumulated in the borehole 3. A pulse signal is inputted to one end part of the conductor 4 on the ground surface side by pulse transmitting means 7, and the input signal is received by receiving means 8 from the other end part of the conductor 4 on the ground surface side. Based on the input signal and the received signal, impedance between the conductors 4 is measured by impedance measuring means 9, and the changes in the underground-water level and the underground-water quality are measured based on the measured results.;COPYRIGHT: (C)1998,JPO