Variations in Oxygen-18Composition in Subsurface Water during Storm Runoff Periods and Mixing Processes.

DOI JASI Web Site 23 References
  • Kubota T
    Forestry and Forest Products Research Institute
  • Tsuboyama Y
    Forestry and Forest Products Research Institute
  • Abe T
    Forestry and Forest Products Research Institute
  • Kabeya N
    Forestry and Forest Products Research Institute
  • Nobuhiro T
    Forestry and Forest Products Research Institute
  • Shimizu A
    Forestry and Forest Products Research Institute

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  • 出水中の地中水における酸素同位体比変化と混合過程
  • シュッスイ チュウ ノ チチュウスイ ニ オケル サンソ ドウイタイヒ ヘンカ ト コンゴウ カテイ

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Abstract

Oxygen-18 variations in subsurface water during two storm runoff periods were investigated atHitachi Ohta Experimental Watershed (0.84 ha) in Japan. Throughfall was sampled every 3.5 mL, and stream waterand piezometric water were sampled every two hours as typhoon T0206 approached to study area on 10 July 2002.Throughfall, stream water, and piezometric water were sampled every hour, and soilwater was sampled every sixhours as typhoon T0213 approached the study area on 18 September 2002. Oxygen-18 in the subsurface water variedup to 0.56‰ in well with a 67-cm depth installed on bedrock, and up to 0.35‰ in a well with a 135.3-cm depthinstalled beneath the bedrock during typhoon T0206. The simulation of oxygen-18 in subsurface water during stormrunoff was attempted using a simple one-reservoir model in which the isotopic composition in the subsurface waterchanges by mixing with event water. The model simulated the oxygen-18 variation in the well with a 67-cm depthduring typhoon T0206 well. This demonstrates that under wet conditions subsurface water mixes immediately withthroughfall infiltrated into subsurface or soilwater during storm runoff. This would make it possible for subsurfacewater to discharge into the stream rapidly.

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