北上線沿線の段丘群

概要

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The drainage areas of the Asahi and Waga Rivers compose a zone crossing the Backbone Ranges of Northeastern Honshu, Japan. In this area, the Backbone Ranges consist of two ranges, the eastern and western, with a lowland between them. From the central lowland, the Asahi River flows westwards through the western range to the Yokote Basin, and the Waga River flows eastwards across the eastern range to the Kitakami River Valley. Fluvial terraces are well developed along these two rivers and their tributaries. The borders of the drainage areas of the Asahi and Waga Rivers are situated on the gentle hills in the central lowland. The terraces are hardly traced beyond the divide. A gorge between the middle and lower courses of the Waga River prevents direct tracing of the terraces. The terrace sequences in three areas along the Asahi and its tributary, the Kurosawa River, along the upper and middle courses of the Waga River, and along the lower course of the Waga River are shown in Tables 1, 2, and 3, separately. The correlation of them (Table 4) was based on the altitude, geomorphology, and deposits of the terraces, especially on the characteristic features built by the minor tributaries and gullies which are thought to have climatic implication during their development. Further discussion concerning the Quaternary crustal movement in the present area will be given at another opportunity.
東北大学の論文
1971-03-31