日本地球惑星科学連合2014年大会

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セッション記号 H (地球人間圏科学) » H-GM 地形学

[H-GM22_30AM1] 地形

2014年4月30日(水) 09:00 〜 10:45 422 (4F)

コンビーナ:*島津 弘(立正大学地球環境科学部地理学科)、小口 千明(埼玉大学・地圏科学研究センター)、瀬戸 真之(福島大学うつくしま福島未来支援センター)、座長:小玉 芳敬(鳥取大学地域学部)

09:30 〜 09:45

[HGM22-03] 局所的な隆起による河川への影響に関するモデル実験

仲内 拓野1、*遠藤 徳孝1 (1.金沢大学理工学域)

キーワード:河川, 隆起, モデル実験

Flume experiments were conducted to examine the effects of uplift on river channels in which the uplift area was restricted to the middle reaches. Experimental landform was evolved by exerting fine water mist on the slope consisting of a mixture of fine sand and clay, and the uplift was realized by jacking up the partial area of the flume bottom. The conventional idea that the occurrence of water gaps was determined by the balance between rates of uplift and downward erosion is true locally. The rate of down erosion is, however, variable due to the change of channel paths in the meso-scale. The avoidance of flowing in the uplift area tends to cause a new confluence and higher stream power producing larger erosion rate. A confluence makes the possibility of forming water gap high. The avoidance of the uplift area, however, does not always induce a confluence, in which the water gap is not generated.