混合粒径からなる砂州と河川横断構造物周辺の河床変動解析法に関する研究
キーワード:
sediment mixture,
grain size distributions,
bed variation analysis,
sandbar transformation,
local scouring
2011 年 17 巻 p. 95-100
詳細
2011 年 17 巻 p. 95-100
It is important for maintenance and management of river structures to predict movement and transformation of sandbar and local scouring around structures during floods. Bed variation in gravel bed rivers during flood is known to be subject to the grain size composition of sandbar. In this study, we investigate the horizontal and vertical variations in grain size distribution of sandbar formed by previous flood events in the Tama River. And we develop a bed variation computation method by the bottom velocity computation method for rivers with sandbar and structures, taking into account the characteristics of grain size composition of sandbars. Discussion is made on the interactions between local scouring and the Nikaryo-Syukugawara Weir in the Tama River during the 2007 flood.
