The Topographic Conditions of the Ôi Alluvial Fan in the Historical Age

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概要

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• The author has researched the surface configulation of the lower plain of the Ôi River in Tôkai Region.To realize this objective, he tries three phases of work: the first is photo and map interpretation, the second the utilization of the ancient documents and maps preserved by old houses in this area, and the last includes intensive field survey.Conclusions are summarized as follows;1) This plain is divided into nine landform types including alluvial fan upper, alluvial fan lower, lagoon and beach ridge.2) Throughout many ages, this river had many distributary channels, and the volume of each channel water varied from flood to flood, and at the same time temporary channels developed out of original ones.3) The shore-line was changed with the shifting of river course. For example, the shoreline between Tajiri and Shizunami underwent a change from concave to cuspate type.4) In the past one thousand years, most of floods in this area were repeated near the banks of the present main stream.5) The low bluffs that stand in the areas between 20 and 45 meters above sea level and "Sankaku Yashiki" (Triangular sites) along the abandoned courses seem to indicate the flood-danger zones and degree.6) The remains of "Wadju" which protected the houses from flood disasters exist in some downstream parts of this fan.7) Throughout the historical age, the area on the fringe of Makinohara Upland and slightly raised areas of fan margin, especially Fujimori village were relatively free from flood dangers as residential place.

• 人文地理学会の論文

著者

• 日下 雅義

  立命館大学文学部

• 日下 雅義

  立命館大学

関連論文

• アメリカ合衆国における地形学の動向
• 人間による土地環境の改変
• 人文地理学と地形研究
• 紀ノ川下流域平野の開発に関する基礎的研究
• 那賀川下流域における平野地形の発達と開発の進展
• The Topographic Conditions of the Ôi Alluvial Fan in the Historical Age

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