Estimating Deep Percolation in a Small Catchment in a Tertiary Formation Using the Chloride Mass Balance Method

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  • ODA Tomoki
    Graduate School of Agricultural and Life Sciences, The University of Tokyo
  • ASANO Yuko
    Graduate School of Agricultural and Life Sciences, The University of Tokyo
  • SUZUKI Masakazu
    Graduate School of Agricultural and Life Sciences, The University of Tokyo

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  • 塩化物イオンの物質収支を用いた新第三紀層山地小流域における深部地下水浸透量の推定
  • エンカブツ イオン ノ ブッシツ シュウシ オ モチイタ シンダイサンキソウ サンチ ショウリュウイキ ニ オケル シンブ チカスイ シントウリョウ ノ スイテイ

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Abstract

Water that infiltrates bedrock is not recorded at outlet weirs, and studies have reported that in some catchments this deep percolation cannot be ignored. In this study, we used the chloride mass balance method to estimate deep percolation in a 1-ha mountainous catchment in a Tertiary formation. We determined the chloride concentrations of throughfall, stemflow and streamwater during baseflow and stormflow, and groundwater. The analysis of chloride inputs and streamwater output indicated that the annual deep percolation was in the range 410 to 640 mm/yr and the mean annual percolation was 530 mm/year, or 22 % of the annual mean precipitation. The input of throughfall and stemflow and the output during stormflow are necessary to estimate deep percolation using the chloride mass balance method in forest catchments.

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