富山県庄川扇状地地下水の滞留時間

概要

論文の詳細を見る
Groundwater system of the Shogawa fan, Toyama, consists of six divisions of aquifers. Each aquifer has characteristic water quality. Present study used tritium measurement to estimate the age of the groundwaters. The piston-flow model indicated that the waters of division 1 from the Oyabe river and division 2 from Takashozu range are less than 3 years old. Age of the groundwater in a southern part of division 3 (from the Sho river) is estimated to be less than 1 year. At a northern part of division 3, old water from a deep confined aquifer appeared to flow into young water of a shallow confined aquifer. Waters of more than 30 years of age were found in divisions 4 and 5. In these divisions, groundwaters of markedly different tritium concentration coexisted. This coexistence suggests little mixing of groundwaters in these areas. Tritium measurement, thus, gives valuable information concerning the origin and subsurface behavior of groundwaters.
日本地球化学会の論文
1987-12-10