The debris flows,occurring in the mountainous area of southwestern China in 2003,are of typically destructive,which are trigged by rainstorm. They swallowed many persons and damaged amount of property.To analyze the debris flow’s movement and deposit characteristics in the area,the authors chose seven typical debris flows to study,which caused much severe hazards.And then we computed their velocity and discharge by some models and concludes the characteristics of large grain and high concentration by statistic and analysis.The value of the debris flow velocity in the mountainous area of southwestern China is very high and the variation of peak discharge is marked.The peak discharge of these debris flows is correlative to the area of valley and in general it increases with the area of valley,however,the relationship between the discharge and area is not positive correlation.In the composition of these debris,some grains are unbelievably large.But the content of the gravels is comparatively low comparing to other viscous debris flows in the southwestern China.
CHENG Ning-Sheng, ZHANG Fei
. Movement and Deposit Characteristics of Typical Catastrophic Debris Flows by Rainstorm in the Mountainous Area of Southwestern China in 2003[J]. SCIENTIA GEOGRAPHICA SINICA, 2006
, 26(6)
: 701
-705
.
DOI: 10.13249/j.cnki.sgs.2006.06.701
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