Estimating groundwater velocity using apparent resistivity tomography: A sandbox experiment

International Conference on Water Resource and Environment 2016

地球科学;生态环境科学

Chen, J.L.^1 ; Chen, C.H.^1 ; Kuo, C.L.^1 ; Fen, C.S.^1 ; Wu, C.C.^1

Dept. of Environmental Engineering and Science, Feng Chia University, 100 Wenhwa Rd., Taichung City, Taichung

40724, Taiwan^1

关键词: Accuracy and repeatabilities;    Apparent conductivity;    Apparent resistivity;    Dispersion coefficient;    Electrical conductivity;    Electrical resistivity tomography;    Groundwater velocity;    Tracer concentration;   

Others  :  https://iopscience.iop.org/article/10.1088/1755-1315/39/1/012056/pdf
DOI  :  10.1088/1755-1315/39/1/012056

学科分类：环境科学（综合）

来源: IOP

【 摘 要 】

The electrical resistivity tomography (ERT) technique can estimate groundwater velocity to within 5% of the pre-set groundwater velocity. The apparent conductivity obtained by the ERT technique is linearly related to the groundwater conductivity, as described by Archie's law. Gaussian-like profiles of the tracer concentration were demonstrated with the ERT technique, and the estimated dispersion coefficient was between 0.0015 and 0.0051 cm2/sec. In terms of monitoring changes in groundwater conductivity, the ERT technique has two major advantages over monitoring wells: (1) it measures a larger area and provides more representative results; and, (2) it does not withdraw groundwater samples, and therefore does not affect the groundwater flow. The objective of this research is to measure groundwater velocity with the ERT technique using only one well. The experiments in this research were divided into two parts. The first part evaluated the accuracy and repeatability of the ERT technique using a dipole-dipole array, and the second part estimated the groundwater velocity in a sandbox using the ERT technique. The length, width, and height of the sandbox, which was made of acrylic, were 1.5, 5, and 1.0 m, respectively. The ERT sandbox was sequentially filled with 5-cm layers of the silica sand to a total height of 70 cm. A total of 32 electrodes spaced every 5-cm were installed in the center of the sandbox. Three monitoring wells were installed along the line of the electrodes. Both no-flow and constant flow (NaCl solution with electrical conductivity and concentration of 5,000 μs/cm and 2.456 g/L, respectively) tracer experiments were conducted.