A new saturated and unsaturated infiltration computation model taking the rising of groundwater level in a slope surface layer into account was developped to simulate the entire processes of shallow landslides occurred during heavy rainfall. The influence of the time distribution of rainfall on the occurrence of shallow landslides was studied with the model. The new model can explain well the fact that most landslides occur when and just after the maximum rainfall intensity takes place. Following results were also obtained through the study. Rainfall whose peak comes in the first half causes landslides earlier than other types of rainfall time distribution. In the case of rainfall whose peak comes in the latter half, the concentration of groundwater influences landslide occurrence than rainfall intensity. Landslide occurrence of concave slopes are controlled by total amount of rainfall than rainfall intensity. On the other hand, landslide occurrence of convex and laterally flat slopes are controlled by rainfall intensity more that of concave slopes.
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