| 摘要 |
<p>PURPOSE:To measure an accurate physical value for a prolonged term by fixing a measuring section with a sensor for measuring a physical value into an excavated pit by upper and lower packers and comparing the physical value measured by the sensor and the physical value of groundwater pumped up by a pump. CONSTITUTION:A boring 4 is lowered into a groundwater measuring device 1, water is injected to upper and lower packers 9, 10, and the packers 9, 10 are expanded, and fastened at the position of measurement in the boring 4. A storage pump 7 is driven, and groundwater in the periphery of a measuring section 6 is sampled while the physical value of groundwater is measured by the measuring section 6. Physical values measured by each measuring section of a pressure measuring section 11, a water-temperature measuring section 12, a conductivity measuring section 13, a pH measuring section 14 and a redox- potential measuring section 15 are frequency-modulated through a control circuit, and transmitted onto the ground. These physical values and the physical value of groundwater sampled are compared. Accordingly, an accurate value can be determined from the displacement of each physical value.</p> |
