Groundwater flow system around the Takayubaru upland area at the south western foot of Aso volcano

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  • 阿蘇西麓台地南部・高遊原台地周辺における地下水流動系について
  • アソ セイロク ダイチ ナンブ コウ ユウゲン ダイチ シュウヘン ニ オケル

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Abstract

<p>The purpose of this study is to investigate the groundwater flow system around the Takayubaru upland area which are located in the south western foot of Aso Volcanoes in Kyushu, Japan. The groundwater flow systems were analyzed by water qualities and potential distributions. The results are summarized as follows:</p><p>1) Groundwater in Takayubaru-lava flows through two layers which are divided by the Futa-Layer, the representative local aquiclude. Groundwater flow direction in the upper layer is from ENE to WSW, which are mostly controlled by the topographic feature of the Futa-Layer. While groundwater flow direction in the lower layer is from SE to NW, which is thought to be connected to the Aso somma aquifer.</p><p>2) The groundwater flow of main aquifer in the study area is controlled by the topographic feature before the Aso pyroclastic flow accumulation. However, this study can not confirm the presence of groundwater valley which is called “Mizumichi” in the previous studies. The groundwater potential in Takayubaru-lava investigated by this study can make clear the precise distribution of piezometric heads in and around this study area.</p><p>3) This study uses concentrations of sulfate ion as the groundwater tracers, because the groundwater in the recharge area has high concentration of sulfate ion. From this analysis and seasonal changes in groundwater qualities, it is cleared that the groundwater recharged by the rice paddy field within the Kikuchi upland flows though the upper layer of main aquifer in this study area.</p>

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