Impact of Volcanic Ash from the 2016 Eruption of Mount Aso on the Water Quality of Rivers in Oita

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  • <b>河川水質に影響する火山灰の降灰量 </b>
  • 2016年阿蘇山噴火による降灰が河川の水質に与える影響及び影響度
  • 2016ネンアソサン フンカ ニ ヨル コウカイ ガ カセン ノ スイシツ ニ アタエル エイキョウ オヨビ エイキョウド
  • 河川水質に影響する火山灰の降灰量 : 2016年の阿蘇山噴火を事例として
  • カセン スイシツ ニ エイキョウ スル カザンバイ ノ コウカイリョウ : 2016ネン ノ アソサン フンカ オ ジレイ ト シテ
  • <b>―2016</b><b>年の阿蘇山噴火を事例として―</b>

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<p>The aim of this study was to investigate the impact of volcanic ash from the 2016 eruption of Mount Aso on the water quality of rivers in Oita. The explosive eruption occurred on October 8, 2016, and the volcanic ash spread in the basins of both Oita and Ohno rivers. The river water quality measurements revealed that F-, SO42-, and H+ concentrations were higher after the eruption. The influence of volcanic ash on the water quality was negligible near the intake point for drinking because of dilution or deposit due to a reservoir. Therefore, it is necessary to monitor the water quality near the intake point for drinking when the deposited volcanic ash is more than 100 g/㎡. However, volcanic ash hardly affects the water quality further downstream. Likewise, if there is a reservoir, the effect of volcanic ash on the water quality is less significant downstream of a river. The effects of volcanic ash on the water quality of rivers become less significant and almost disappear after 1 month.</p>

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