12:00 PM - 12:15 PM
[HTT21-06] Characteristics of the distribution of δ18O, δD and d-excess values in groundwater and spring water at Fukushima and Niigata prefecture
Keywords:Fukushima, Niigata, groundwater, spring water, stable isotope, d-excess
Stable isotopes of oxygen and hydrogen are relatively high near the coastal area and relatively low at inland area, thus the inland effect is confirmed. And isotopes are relatively low in high altitude area (e.g. mountainous area), the altitude effect and temperature effect are also recognized.
From the distribution map of d-excess values, it is obvious that the d-excess is relatively low at Pacific coastal regions (Fukushima prefecture) and relatively high at coasts of Japan Sea regions (Niigata prefecture). It is assumed that the difference of d-excess values is affected by origin of the water vapor. The d-excess values change near the Ou mountains, and not change near the Abukuma mountains. Elevation of the Ou mountains is higher than Abukuma mountains, hence the water vapor is prevented by the Ou mountains is considered.