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Frequency–volume relation and prediction of rainfall-induced landslides
Authors:F. C. Dai  C. F. Lee  
Affiliation:

a Institute of Geographical Sciences and Natural Resources, Chinese Academy of Sciences, Beijing 100101, People's Republic of China

b Department of Civil and Structural Engineering, The University of Hong Kong, Pokfulam Road, Hong Kong, People's Republic of China

Abstract:Rainfall-induced landslides constitute a major public concern in Hong Kong. This paper investigates two aspects of critical importance to landslide hazard and risk assessment and management: magnitude–cumulative frequency relationship for landslides, and relationship between rainfall and the occurrence of landslides. The results indicated that landslides with a failure volume of not less than 4 m3 have a cumulative frequency–size distribution with a power-law dependence on volume of failure. Analysis of rainfall/landslides showed that the 12-hour rolling rainfall is most important in predicting the number of landslides. Failure volume dependency in the relationships between rainfall and the number of landslides is also presented. However, with an increase in failure volume of landslides, the most important rainfall variable may vary from rainfall of short duration (12-h rolling rainfall) to that of relatively long duration (24-h rolling rainfall).
Keywords:Landslide   Rainfall   Magnitude–frequency   Prediction
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