Heavy rainfall induced landslides in Bac Kan and Binh Dinh provinces

Abstract

Landslides is one ofthe most severe hazard in Vietnam, arnong that a major number of landslides are induced by heavy rainfall The paper deals with heavy rainfall induces shallow landslides at the excavated slopes in Bac Kan province and at the natural slopes in Binh Dinh province. Landslides in Bac Kan can happen when the amount ofrainfall is 180tmn continuously. Landslides of natural slopes in Binh Dinh can only occur when rainfall makes the slopes ahnost saturated. This can happen when the arnouut of rainfall reach over 1260mm. Landslides induced by heavy rainfall also depend on the initial water content (i.e. antecedent rainfall), geological settings, and plant cover. Thereforc rainfall path and critical rainfall ean vary in a given range in a place, and can vary widcly from place to place.