石礫河川の粒度分布特性と安定河道形状
キーワード:
stony bed rivers,
field experiment,
grain size distribution,
boulders,
cobbles stable cross-sectional form
2008 年 14 巻 p. 7-12
詳細
2008 年 14 巻 p. 7-12
The river-bed elevation of stony bed rivers is controlled by boulders and cobbles. The authors have clarified mechanism of river-bed variation, characteristics of grain size group and river-bed stability in stony bed rivers from results of field experiments of straight channel conducted in the Joganji River in 2004 and 2005.
In this study, we analysed the results of field experiments using a meandering channel of the Joganji River in 2006. We examined characteristics of grain size distribution in meandering rivers with boulders and cobbles, and the effects of meander and revetment on river-bed elevation grain size distribution. Furthermore, we clarified a physical parameter forming the stable cross-section of stony bed rivers based on the all field experiments. A method of bed material survey applicable to stony bed rivers is proposed by comparing with the existing sieve analysis method.
