한국지구물리탐사학회:학술대회논문집
- 2003.11a
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- Pages.344-351
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- 2003
Recharge mechanism using electromagnetic ground conductivity survey and tritium concentration analyses of groundwater in salt affected area, Northeast Thailand
- Imaizumi Masayuki (National Institute for Rural Engineering) ;
- Sukchan Somsaku (Land Development Department) ;
- Ishida Satoshi (National Institute for Rural Engineering) ;
- Tsuchihara Takeo (National Institute for Rural Engineering) ;
- Ohonishi Ryouichi (National Institute for Rural Engineering)
- Published : 2003.11.01
Abstract
Hydrogeological survey and geochemical analysis were carried out in Phra Yun area, Northeast Thailand, which is a typical salt-affected area for an understanding of hydrogeological groundwater behaviours. Geological survey reveals the presence of G1 and F1 faults. Electromagnetic ground conductivity prospecting shows that the high conductivity zones of 15 mS/cm or more are distributed at underground of the G1 and F1 faults where saline groundwater is discharged. The distribution patterns of tritium concentration show that high tritium concentration zones of groundwater were recharged from pond and river. On the assumption that the annual average tritium concentration of precipitation in Northeast Thailand is same as tritium concentration of precipitation in Tokyo and groundwater flows as piston flow, the age of recharging precipitation of groundwater with 15 TU in 1997 could be estimated at 1967-1970 years. The velocity of groundwater flow was calculated to be
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