崖錐,沖積錐および扇状地の縦断勾配と構成礫の円形度との関係

概要

論文の詳細を見る
The Krumbein's roundness of gravel was measured for the deposits, which form the surfaces of talus, alluvial cones and alluvial fans at 72 sites in Japan. The roundness ranges 0.2 〜 0.3 at talus, 0.2 〜 0.5 at alluvial cones, 0.3 〜 0.5 at very small fans (radius of fan, R_F, ≤ 1 km), 0.3 〜 0.6 at small fans (1 km < R_F ≤ 5 km), 0.5 〜 0.8 at middle fans (5 km < R_F ≤ 10 km) and 0.5 〜 0.8 at large fans (10 km < R_F), respectively. Longitudinal gradients of the depositional surfaces at the sites where the roundness was measured range 4 × 10^<-1> 〜 8 × 10^<-1> at the talus, 9 × 10^<-2> 〜 4 × 10^<-1> at the alluvial cones, 7 × 10^<-2> 〜 2 × 10^<-1> at the very small fans, 3 × 10^<-2> 〜 2 × 10^<-1> at the small fans, 4 × 10^<-3> 〜 3 × 10^<-2> at the middle fans and 4 × 10^<-4> 〜 9 × 10^<-3> at the large fans, respectively. The combination of the roundness and the gradient will be a key to roughly demarcate three geomorphic types in the field.
日本地形学連合の論文
2002-01-25