ビワ湖東岸の地質と地下水の流出機構について

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The writers intended in this paper to discribe some considerations on groundwater of the eastern part of the Lake Biwa, Shiga Prefecture from biew point of geology. Through investigation of well , we have found that artesian well (local name Dokkoisho) and non-flowing well (local name Horinukiido) are distributed distinctly separated from each other. The area is composed mainly of the basement complex, the Paleo-Biwa Group, the old terrace deposits, the young terrace deposits and the allvial deposits. Each members, excepting the besement complex, are inclined gently towards the Lake. First of all, the young terrace deposits are the most suitable layers to allow groundwater flow. And the zonal distribution of the artesian wells also have direct connection with the structure of these layers. The artesian well zone coinsides perfectly with the area of the allvial deposits. From this facts, the writers came to the following conclusion. The allvial deposits is considered to cover the pervious young terrace layer as impervious cap rock. Artesian wells are limited only under this condition. In this respect, the pervious young terace deposits are referred to a headrace channel below the allvial deposits and extend to the lake bottom making the second subaquatic terrace plane, from where the groundwater springs out. In conclusion, flow of groundwater in this area is considerably controlled by geological structure and topographical condition.
地学団体研究会の論文
1964-09-30

ビワ湖東岸の地質と地下水の流出機構について

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