著者

籠瀬 良明

出版者

THE TOHOKU GEOGRAPHICAL ASSOCIATION

雑誌

東北地理 (ISSN:03872777)

巻号頁・発行日

vol.35, no.4, pp.159-168, 1983 (Released:2010-04-30)

参考文献数

4

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In the western part of Ibaraki prefecture, there is a slender zone of paddy fields which is located in between Mitsukaido City and Sanwa Town. It is called ‘Iinuma-Shinden’. This zone had been a shallow lake until 1725 (the 10th Year of Kyoho). The lake was reclaimed by Tokugawa Shogunate which accepted the villagers' petition of the reclamation.The writer has studied this zone, and clarified where the former lacustrine shoreline was existed (Figs. 4, 8, etc.). The data for deciding upon the shoreline are as follows; a) the large scale maps published after 1965 (Figs. 8, 9, etc.), b) the map of district baundaries of former towns and villages in this zone (Fig. 6.), and c) the old map of this zone made in 1724 (Figs. 1, 7, etc.).From these data, the writer has estimated the surface level of the former lake was 10.7 meter in height and made clear that the farmers' settlements were distributed around the paddy fields made by reclamation. Furthermore, the writer has clarified that the place of their settlements was on the topset flat of the former delta (of the “lake days”), and consisted of soft silt and sand from 20 to 40 meter thick.