平野地域における歴史的街道沿いの地形条件―関東平野の中山道を事例に― The Geomorphic Features of the Plain Areas along the Historical Highways: A Case Study of the Nakasendo Highway in Japan's Kanto Plain.

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抄録

本研究では,江戸時代の五街道の一つである中山道の関東平野の範囲を対象に,平野地域における歴史的な街道の地形条件の特徴を明らかにした.研究の方法は,街道のルートを正確にマッピングし,第二次世界大戦直後の空中写真の実体視により街道沿いの地形を分類した.本研究で明らかになったことは,平野全体でみた場合,そのルートは比較的直線であり,台地をできるだけ通過し,山地や丘陵,沖積低地を避ける傾向があることである.また,地形分類でみた場合,以下の特徴が挙げられる.台地では開析谷を避け,面の分水界に沿う傾向があること,扇状地性の台地では等高線に平行する弧を描くルートをとること,沖積低地では自然堤防を伝い,旧河道や後背湿地,河川を可能な限り通過しないことである.これらの特徴からは,高低差を少なくする通行の容易性と,水害を避けるという安全性の両面に配慮していることが指摘できる.ただし,いくつかの地点では,安全性よりも容易性を優先したルートも認められる.

This paper provides characteristics of the geomorphic features of the plain areas along historical highways on the basis of a geomorphologic examination of the route along the Kanto plain of the Nakasendo Highway, which was one of the five main highways of the Edo era. The author first maps the detailed route of the highway and then classifies landforms occurring along the highway through the stereo interpretation of aerial photographs that were taken just after World War II. The paper clarifies that the highway route appears almost straight and is usually located on terraces in the view of the entire plain scale. It is unusual that the route is found in mountains, hills, and the alluvial plain. Precise geomorphic analyses lead to the following conclusions. On the terrace, the highway route seldom crosses the dissected valley and follows the watershed in the middle of the terraces. The route on fans is an outward arc in shape parallel to contour line. The route was constructed on the natural levee in the alluvial plain so as not to cross the former rivers, back marshes, and present rivers. Based on these characteristics, the author concludes that the highway route was in the control of accessibility and safety against water hazards. However, accessibility took priority over safety at a few places.

収録刊行物

  • E-journal GEO

    E-journal GEO 5(1), 15-34, 2010

    The Association of Japanese Geographers

各種コード

  • NII論文ID(NAID)
    130000298522
  • 本文言語コード
    UNK
  • ISSN
    1880-8107
  • データ提供元
    J-STAGE 
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