Abstract
A comparison of deuterium excess or d-values of precipitation and groundwater at Cheju Island, Korea, indicates that, unlike in many temperate climates, precipitation during the whole year contributes to groundwater recharge. This in turn suggests that evapotranspiration effects are minimal, consistent with the fact that the island contains highly permeable volcanic rocks overlain by thin soils. This hypothesis is contrary to current water budget models that ascribe a significant role to evapotranspiration processes. Three coastal springs, and several streams and ponds throughout the island have enriched δ 18O and δD values that plot off the local meteoric water line and have relatively high Cl concentrations. This relationship is suggestive of seawater mixing for the coastal springs and evaporation for the streams and ponds. This database thus provides a useful means for evaluation of groundwater resources of the island.
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