Investigation on Mechanism of Landslide Caused by Rainfall in Indochina Countries

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This study investigates the mechanism of landslide event caused by heavy rainfall based on field measurement results conducted in Thailand. The obtained results are summarized as follows. First, rainfall characteristics observed in Thailand are similar to those of torrential rainfall observed in Japan. Second, in proportion to the increase of rainfall, surface flow along slope becomes dominating and increases by 80 %, causing slope erosion, frequent events observed in Southeast Asia. Furthermore, the monitoring results on rainfall infiltration into subsoil suggest the possibility that it is necessary to adopt the new rainfall indices considering the effect of antecedent rainfall on slope stability, in order to establish landslide early warning system.