第三紀層泥岩地すべり斜面の浅層地下水の水質変化 : 新潟県板倉町の大池地すべりを例として

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概要

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• The underground temperature survey and radioactivity prospecting had shown that three groundwater vein-streams are caused by different origin on Ohoile landslide slope in Itakura Town, Niigata Prefecture; west groundwater vein-stream by fault, center groundwater vein-stream by fissures zone of combination of small landslides, and east groundwater vein-stream by the fissures zone and underflow of stream water. It may be inferred that the shallow ground water flow downstream through the zone of strongly weathered mudstone and the vein-streams. The relationship between geochemistry of shallow groundwater and groundwater vein-streams, and the variation of shallow ground water geochemistry as groundwater flow downstream has been studied. The shallow groundwater is divided into high silica concentration group : Group 1, and low silica concentration group : Group 2. The Group 1 is subdivided into two subgroups : Group 1a and Group 1b, on the basis of its rate of electrical conductivity and Na^+ concentration increase in proportion to groundwater flow distance. The Group 1a is high rate of increase. The Group 1b is low rate of that. The distribution areas of Group 1a, Group 1b, and Group 2 practically coincide with the area of west groundwater vein-stream, that of center groundwater vein-stream, and that of east groundwater vein-stream, individually. The different origin of vein-streams is presumably related to the diffrent variation of geochemistry of groundwater.

• 一般社団法人日本応用地質学会の論文
• 1996-04-10

著者

• 今泉 眞之

  国際農林水産業研究センター

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