摘要
物源、降水、地形是泥石流形成的三大基本条件,同一次降水同一流域范围内并不是所有泥石流沟都会发生泥石流,可见在小流域范围内,物源因子和降水因子基本接近时地形因子对泥石流的发生起着首要作用。本文以龙溪河流域泥石流沟为例来探讨地形因子对泥石流易发程度的影响。选取流域面积、形状系数和沟道纵比降等参数进行研究并获取三者相互之间的关系而得到一个能全面反映地形条件的综合地形因子G:G=F×J(A/A0)0.2。对该研究区来说,G=0.2是该区域泥石流沟发生泥石流的界限,即G>0.20时会发生泥石流,G<0.20时不会发生泥石流。在白水河流域验证此理论得知地形因子G对泥石流的发生同样具有重要意义,但物源和降水情况的差异也会影响泥石流的发生,因此该成果不能涵盖所有的地形条件,故适应性有一定限制性。
There are three factors related to topography,geology and hydrology which have influence on the formation of debris flows. At the same rainfall conditions in some catchment range,not all debris flows would occurr. The topography factor plays an important role on causing debris flows when the geological and rainfall conditions are roughly the same in an area. The basin area,channel gradient and shape factor are selected as the topographical parameters in the Longxi River Area. A new factor G = F × J(A/A0）0. 2 is proposed as a single terrain indicator,which may be used as a threshold parameter for assessing the formation of debris flows. In the study area of Longxi River Area,it is very high probabilities of debris flow formation when G 〉0. 20,and the probabilities of debris flow formation is very low when G 〈 0. 20. This paper indicate that the topography factors G has important influence on forming debris flow, but the difference of source and precipitation should also be considered to assess on the debris-flow susceptibility.
作者
马煜
李彩侠
MA Yu;LI Caixia(The Engineering ＆ Technical College of Chengdu University of Technology, Leshan, Sichuan 614000, China)
出处
《中国地质灾害与防治学报》
CSCD
2018年第2期16-21,共6页
The Chinese Journal of Geological Hazard and Control
基金
四川省教育厅基金(18ZA0076
16ZB0407)
成都理工大学工程技术学院院级科研基金(C122016020
C122017009)
关键词
泥石流
地形因子
龙溪河流域
debris flow
topographic factor
Longxi River Area
