舟曲县南峪沟松散固体物源及其对泥石流的补给特征

LOOSE SOLID SOURCES AND THEIR SUPPLY TO DEBRIS FLOWS IN NANYU GULLY,ZHOUQU

南峪沟地处特殊的构造部位,特定的地层经长期的内外营力共同作用,形成泥石流松散固体物源。物源类型有重力堆积物和沟床中下游段松散堆积物,其分布相对较集中,对泥石流补给方式表现为坡面冲刷、崩塌、滑坍和流体冲刷;沟域面积和沟道长度与物源量没有明显的对应关系,决定泥石流补给量的主要因素是沟谷形态和山体岩石类型。

Loose solid sources are formed due to the long-term effect of internal and external forces on special strata, In Nanyu Gully in a particular position. Source types include gravitational deposits and residual materials at the midstream and downstream, which are relatively concentrated and supply flow debris through surface washout, slump, slide and fluid scour; no clear correspondence is found of supplied amount to the area of the reaches and the length of the channel, and the supply is determined mainly by gully configuration and rock types.