Hydrogeological survey using geophysical prospecting for saline groundwater in Phra Yuen area, northeast Thailand

• Published in: Transactions of The Japanese Society of Irrigation, Drainage and Reclamation Engineering Vol. 2003; no. 225; pp. 349 - 360
• Main Authors: Imaizumi, M. (National Inst. for Rural Engineering, Tsukuba, Ibaraki (Japan)), Sukchan, S, Nakazato, H, Okuyama, T, Ohonisi, R, Takeuchi, M
• Format: Journal Article
• Language: Japanese
• Published: The Japanese Society of Irrigation, Drainage and Rural Engineering 25.06.2003
• Subjects: Electric prospecting; Electromagnetic survey; Fault; GROUNDWATER; HYDROGEOLOGY; Rock salt; Saline groundwater; SALINE WATER; SOIL SURVEYS; THAILAND
• ISSN: 0387-2335; 1884-7234
• DOI: 10.11408/jsidre1965.2003.349

The rock salt layers underlie at shallow depth under 50m-100m in depth and saline groundwater is distributed in Phra Yuen area, northeast Thailand. The G1 and F 1 faults were inferred by analyses of geological columns at 16 sites (A1-A16) of the regular 1 km grid covered 3km×3km area and photo-lineaments interpretation. The electromagnetic prospecting, the electric prospecting, and the soil temperature survey at 1m depth were carried out along the survey lines of A5-A7 and A10-Al2 to verify the inferred faults. The conductivity sections by electromagnetic survey showed the vertical distributions of high conductivity zone around the inferred G1 and F 1 faults. The resistivity section showed the vertical distributions of high resistivity zone around F1 fault. The results of soil temperature survey revealed an anomaly low soil temperature zone over the F 1 fault. The cross-check of different methods of physical prospecting ensures the possibility of inferred G1 and F 1 faults. The monitoring result of groundwater showed that the electric conductivity of groundwater changes seasonally and locally. The evidences of groundwater with a high electric conductivity and distribution of ponds with water salinization along inferred faults support that fault has a function of pathway for upward movement of the saline groundwater.