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熊野川中流部における環流旧河谷の堆積過程の検討

Depositional processes of circular abandoned channels around the middle parts of the Kumano River, Southwest Japan

中西 利典*; 小松 哲也  ; 小形 学 ; 川村 淳; 安江 健一*

Nakanishi, Toshimichi*; Komatsu, Tetsuya; Ogata, Manabu; Kawamura, Makoto; Yasue, Kenichi*

熊野川中流部の穿入蛇行跡において採取したボーリングコア試料を観察・解析して同段丘地形の形成過程を検討した。古い段丘地形ほど現在の河床面よりも高い位置に分布すると想定したが、環流旧河谷の地下には支流成の土石流堆積物が厚く分布する場合があるため、同地表面を隆起・侵食の指標とする際には注意が必要である。

The formation process of terrace topography was investigated by observing and analyzing boring core samples collected in the middle reaches of the Kumano River. It was assumed that the older terrace topography was distributed higher than the current riverbed surface. However, since tributary debris flow deposits may be thickly distributed beneath the old gyre river valley, care must be taken when using the surface of the ground as an index of uplift and erosion.

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