论冰碛石的形态特征及其与泥石流石的区别
周尚哲
A study on the morphological features of glaciated stone and its differences from debris flow stone
Shangzhe ZHOU
表1
砾石圆度分级(据Benn
[
7
]
和Powers
[
9
]
)
Table 1
Classes of Gravel roundness (modified from Benn
[
7
]
and Powers
[
9
]
)
形状
描述
Powers 磨圆指数
极棱角VA(very angular)
多边多面,带尖角利刃
0.12~0.17
棱角状A(angular)
多边多面,无尖角利刃
0.17~0.25
次棱角状SA(subangular)
边磨损,面未磨损
0.25~0.35
次圆SR(subrounded)
边、面均磨损,但仍清晰可辨
0.35~0.49
圆R(rounded)
边、面磨损,已不易辨别
0.49~0.70
极圆WR(well rounded)
已不存在多边多面
0.70~1.00