静岡平野における地下水流動系(<特集>沿岸海底湧水の地球科学)

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Stable isotopes (deuterium and oxygen-18), major inorganic ion chemistry, and tritium have been measured to understand the groundwater flow system in the Shizuoka plain, Japan. We found the following regional groundwater characteristics. (1) Most of shallow groundwaters in the Shizuoka plain is mainly classified as a calciumbicarbonate type, while deeper aquifers as a sodium-bicarbonate type. (2) The groundwater in this plain is recharged by either precipitation over the plain or Abe riverwater or both. The contribution of the riverwater in the groundwater decreases as the distance from the Abe River, although this contribution is different at eastern and western sides of river. In the western area, the riverwater contribution is smaller than local precipitation or Mariko riverwater. (3) The tritium concentration in the groundwaters shows that most groundwaters in the study area derive from rainwater after 1970 to present, although a part of deep groundwater indicates the residence time of 50 years or more. The groundwater flow characteristics in the studied plain are determined by the permeability of the aquifer materials rather than the depth. Thus, the deep groundwater collected near the Abe River where the alluvial gravel dominates has short residence time compared to that collected near the Oya River where the silt and clay dominate more. The submarine groundwater discharge at Motimune coast was confirmed the contribution from the land water. But their origin and flow paths are not yet identified.
日本地球化学会の論文
2005-08-20

静岡平野における地下水流動系(<特集>沿岸海底湧水の地球科学)

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