河州水の流量および水質による表層部の地下水流動の推定 : 岐阜県東濃地域におけるケーススタディ

概要

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This study is designed to define the correlation between surface geology and discharge and chemical composition of the stream water in order to estimate the groundwater flow system. In the 29 catchments in the Tono area which consist of basement granite, and overlaying Mizunami Group (sandstone, mudstone, etc.) and Seto Group (unconsolidated sediments), flow rates and chemical composition of the stream water were analysed in a dry season. These values were compared with the surface geological condition of each catchment by multivariate analyses. Results are summarized as follows; (1) Height of runoff is smaller in the catchments where the Mizunami Group. (2) A discriminant analysis revealed that classification of stream water based on surface geology corresponds well with the classification based on chemical composition. This indicates the chemical composition of the stream water is relevant to the surface geology of the catchment. (3) The results of a principal component analysis for chemical composition of the stream water indicates that the residence time of groundwater in the Seto Group is smaller compared to that in the Mizunami Group.
一般社団法人日本応用地質学会の論文
1995-04-10