| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To simplify the constitution of a measurement apparatus and to eliminate the need for a working power supply of the measurement apparatus, when a flow direction and a flow speed of groundwater are to be measured inside an observation well drilled in the ground. <P>SOLUTION: In a paper sheet P2 with a hole at the center, a plurality of dot patterns d are formed by a water-soluble ink so as to provide an orientation alignment mark, and a printed surface of the P2 is covered with a paper sheet P1, which has the same shape as the P2 and does not have the printed dot pattern. A pair of holding plates are formed with a hole at the center gripped by a water-permeable sponge formed with a hole in the center, and grip both sides. A support rod 4 is penetrated through the hole formed in the entire center, and is integrally held to form a measurement apparatus body 1. The measurement apparatus body is held, in a state where it is attached to a lower end of a rod member, and disposed in the groundwater observation well. The orientation alignment is implemented. The measurement is implemented for a predetermined time. After the predetermined time, the paper sheet is extracted and retrieved. The groundwater flow direction and flow speed are obtained from the length and the direction of a tailing d' which is associated with and generated by the dot pattern d in the P2. <P>COPYRIGHT: (C)2011,JPO&INPIT</p> |
