NOTES AND CORRESPONDENCE : Behavior of Subsurface Water Revealed by Stable Isotope and Tensiometric Observation in the Tibetan Plateau

概要

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Intensive observation of the pressure head in subsurface water and sampling of subsurface water were performed to investigate the subsurface flow process in the Tibetan plateau from July 24 to September 12-the mon500n season-1998, Pressure head of the subsurface water was monitored using tensiometers and subsurface water was sampled using suction lysimeters installed at multiple depths from 10 to 100 cm. The pressure head of subsurface water ranged from - 10 to -100cmH_20, and zero flux plane was often observed above the depth of 30 cm. The groundwatper rechalge was very active during this period, thus the groundwater table rose up to the depth of 55 cm in the beginning of September. The 8D and δ^18 of sha11ow subsurface water varied marked1y with precipitation and evaporation, whereas those of ground water were stable. The meanδ180 of ground water was 3.4‰ higher than the volume weighted meanδ180 of precipitation. The difference ofδO between the ground water and the precipitation wou1d be caused by isotopic enrichment along with evaporation from the so11 surface, and 27% of precipitation might be lost by evaporation from the soil surface.
社団法人日本気象学会の論文
2001-03-25