Abstract
In northeast Thailand, salinization caused by the discharge of salty groundwater is a serious problem. Locations where groundwater flows into surface water must be identified before measures against salinization can be taken. Radon-222 (222Rn) is a useful indicator for determining areas of groundwater discharge. We measured 222Rn concentrations in surface waters in the region and found that groundwater flows into streams and lakes in low-elevation areas (below 180 m) . Our results agree with the results of published simulations of groundwater flow.
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