s from the Journal of Japanese Forestry Society J For Res (2005) 10:79–82 © The Japanese Forest Society and Springer-Verlag Tokyo 2005 DOI 10.1007/s10310-004-0127-6 The original papers appeared in the Journal of Japanese Forestry Society vol. 86, no. 3 in Japanese with English abstracts with a 67-cm depth installed on bedrock, and up to 0.35 in a well with a 135.3-cm depth installed beneath the bedrock during typhoon T0206. The simulation of oxygen-18 in subsurface water during storm runoff was attempted using a simple one-reservoir model in which the isotopic composition in the subsurface water changes by mixing with event water. The model simulated the oxygen-18 variation in the well with a 67-cm depth during typhoon T0206 well. This demonstrates that under wet conditions subsurface water mixes immediately with throughfall infiltrated into subsurface or soilwater during storm runoff. This would make it possible for subsurface water to discharge into the stream rapidly.
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