Research on Material Source Factors of Gully-Type Debris Flow Caused by Shallow Landslides
Chen Wenhong
Yu Bin
Ye Peng
Liu Kan
Ye Longzhen
Yang Zhiyi
Abstract：Few studies pay attention to revealing the relationship between the amount of landslide material and the formation of gully debris flow,although a large number of shallow landslides in a watershed can lead to gully-type debris.Thus,the landslide source conditions required for the formation of this type of debris flow are evaluated based on the mechanism of debris flow formation.To analyze the relationship between the debris flow by shallow landslides in Baozhuang Village,Fujian,in 2010.And the material model of gully-type debris flow by shallow landslides was proposed.The result shows that the larger the landslides area in the catchment,the greater the possibility of gully-type debris flow.The landslide area(A0),catchment area(A)and soil thickness(h)can be applied to classify the susceptibility class of gully-type debris flow by shallow landslides.For the gullies in the East China region:when the average soil thickness of the catchment is h(m),the total of area where landslides occur(A0)is related to the area of the catchment(A)as:it is very high probabilities of debris flow formation when A0/A≥0.045×(3/h).The probabilities of debris flow formation is medium when 0.02×(3/h)≤A0/A≤0.045×(3/h).The probabilities of debris flow formation is very low when 0.02×(3/h)≥A0/A.When the total area of landslides entering the channel(AL)is related to the area of the catchment(A)as:it is very high probabilities of debris flow formation when AL/A≥0.03×(3/h).The probabilities of debris flow formation is medium when 0.006 5×(3/h)≤AL/A≤0.03×(3/h).The probabilities of debris flow formation is very low when 0.006 5×(3/h)≥AL/A.The empirical models are simple,and the data needed necessary for the input are easily measurable catchment areas and landslides area.The approach may be applied to the analysis debris flow by shallow landslides in other areas due to simplicity,when adapting the threshold parameters according to new local conditions.
Keywords：shallow landslidesdebris flowstatistical modelthresholdengineering geology
Publication Date：2025-06-30
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：16( 2356-2371 )