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Debris flows are mass movements composed by a viscous mixture of debris and water, very fast and highly mobile, with great energy and destructive power [Takahashi, 2007 ; Hungr et al ., 2014]. They occur in small basins with high hypsometric gradient and are characterized by : i) a zone of nucleation or initiation; ii) a channeled transport zone; and iii) a deposition zone downstream, characterized by the formation of depositional fans [Jakob and Hungr, 2005]. The initiation zone of debris flows corresponds to the region where there is slope failure on steep rock slopes, ravines or marginal channels (Fig.1). These material is entrapped by ravines or channels and loose the cohesion, generating debris flows [Hungr et al, 2005]. This process occurs either in sub-basins of order one or zero, associated with positive relief breaks, with slopes between 20-45°[Jakob, 2005]. Initiation zones have implications with hazard mapping, because it controls the generation and run-off of debris flows [Coe et al., 2008]. Due to their physical characteristics, the initiation zones are usually poorly monitored, and consequently the rainfall conditions or soil moisture of these areas is poorly understood. The study of the relationship between rock and its weathering products is important to understand the nucleation of shallow translational landslides which trigger debris flows [Chiu and Ng, 2014]. Several types of classifications have been proposed to account for the complexities of the granitic regolith profiles Original Article

Geotechnical and Mineralogical Properties of Granite Regolith Related to Nucleation Mechanisms of Debris Flows in Tropical Areas