Assessment of Hazard Potential of Debris Flows in Relation to the Reclamation of Forests on the Foot of Volcanoes

This paper focuses on the hazards due to debris flows in the alluvial fans on the foot of volcanoes. A case study is carried out to assess the hazards associated with the transformation of forests to golf courses. A close examination of geomorphic evidence gives the history of occurrence of the debris flows of varied ages in the past and the estimate of their recurrence. To generalize this result, hazard potential is defined, from which hazard and risk are derived according to the time span, location and details of the reclamation.