The Wells in the Central Section of the Nasuno-Basin : The Fluctuation of the Water Table

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紀要論文

From the foregoing regional analyses it is clearly known that the seven subsections A, B, C, D, E, F and G which were established in paper (2) on the basis of the three important characteristics of the wells, i.e. the depth of the wells, the depth of the water table and the thickness of the water in the wells, are also contrasted and compared, respectively as a whole, regarding a fourth basic characteristic of the wells, namely, the fluctuation of the water table. When considered as a series of contiguous regions, the most striking contrasts are found between the respective couples A and B, D and E, and C and F. Similarities, on the other hand, are pointed out between C and E, and F and G. These regional contrasts are hypothetically considered to be due to the three different and independent subdrainage systems, i.e. the systems which are controlled respectively by those rivers Naka, the couple of Kuma and Sabi and lastly Hoki. While the sphere of influence of these subdrainage systems perhaps corresponds directly with D, C and G, respectively in order of mention, on the other hand, both E and F are under the respe\ ctive indirect influence of the Kuma and the Hoki. As for A and B such subdrainage systems are yet unknown. Such and other important items still remain uncertain in connection with the origin of the areal differentiations regarding the fluctuation of the water table. It is, however, undoubtedly clear that the regional division of the central section into those seven subsections is also reasonable and useful when viewed from the fourth angle, i.e. the fluctuation of the water table, at least as far as the observations in 1950, 1961, 1962 and 1963 are concerned. The present author has to acknowledge his indebtedness to the Scientific Research Grant of the Ministry of Education for the year 1964. He is also deeply indebted to the Kanto Regional Office (Kanto Nosei-Kyoku) of the Ministry of Agriculture and Forestry for the ample facilities afforded to him to make use of the data analysed in the course of this study. His cordial thanks are due to Mr. Noboru Sagehashi for his kind oral communications and also to Miss Setsuko Okazaki for her assistance in analysing the data.

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