Landslide investigation of roads in Sochi on the basis of the optimum risk method

For a risk estimate qualitative, semiquantitative and quantitative approaches (Chowdhury & Flentje 2003) are used nowadays. The qualitative and semiquantitative risk estimate, as a rule, is based on judgement, and also on qualifications and experience of experts and is applied in conditions of data deficiency. The landslide risk qualitative analysis needs accordingly a quantitative assessment of the factors promoting origin of hazard (Postoev 2003).