论小流域内泥石流物源的判别—以康定县子耳沟为例

Assessment of the debris flow origins along the mountainous stream basins:An example from the Zi’er gully in Kangding,Sichuan

关键词:  子耳沟  泥石流  松散碎屑物  稳定性

Key words:  Zi'er gully  debris flow  loose deposits  stability

摘要:

小流域内松散碎屑物质的稳定性及储量可以作为泥石流沟判别的依据。本文以康定县子耳沟为例,通过对滑塌面积率、不良地质体长度比、流域内暴发泥石流的碎屑物量最低标准三个指数的计算,判定子耳沟流域内松散碎屑物质物源丰富且不稳定,泥石流暴发可能性大。这种方法的应用,可以指导泥石流的预报预警和防灾减灾工作,判别山区小流域暴发泥石流的易发程度及规模。

Abstract:

With the ever-growing trend of extreme weathers,the debris flows frequently occur and bring about more and more tremendous disasters all over the world.The assessment of the stability and reserves of the loose deposits along the mountainous stream basins may help establish a basis for the recognition of debris flow gullies.In this paper,three parameters are calculated,including slump area rate,length ratio of the unfavourable geological bodies,and minimum amounts of the debris flow-triggering loose deposits.The calculations indicate the possibility of the debris flows along the Zi’er gully in Kangding,Sichuan due to the accumulation of abundant and unstable loose deposits.This method may be viable in the application to the forecast and supervise-warning,and risk assessment of the debris flows.