DEVELOPMENT OF RAPID AND ELECTRIC FREE MEASUREMENT METHOD OF GROUNDWATER VELOCITY

Abstract

 We have developed a rapid measurement method to the paper disc groundwater velocity meter which uses no electricity. The paper disc groundwater velocimeter can measure the groundwater velocity and direction in one borehole using the trajectory of the ink transported by the groundwater water on the paper disc. The smallest measurement time of this device is 5 min. However, it should have the image analysis of the paper and should take much time to get the result. If the device could measure the result immediately after the measurement, the total performance of the velocimetry will be more rapid. We have developed a ruler to convert the tailing length to groundwater velocity and flow direction.
 We evaluated the measurement accuracy after the application of the sensory analysis. As a result of the sensory analysis, in the range between 0.3 to 1.5 cm/min, the accuracy of the velocity and direction were within 33% and 10 degrees respectively. Though the measurement accuracy of the velocity was lower than the existing calorimetry device, the measurement accuracy of the flow direction was as same degree of the existing calorimetry device.