STATISTICAL RELATIONS BETWEEN GEO-HAZARDS AND RAIN-TYPE

Geo-hazards have some correlations with rain-time, rainfall and rain-type. For different rain-types, rainfall induced geo-hazards have different characteristics. In this paper, according to rainfall and geo-hazards data, the rainfalls that can induce geo-hazards are classified into three types. They are typhoon rainfall, sustained rainfall and regional rainstorm. The characteristics of geo-hazards induced by different rainfall-types are different. Typhoon rainfall induced geo-hazards have the characteristics of hazards and rainfall consistently. It is consistent in time and space. The hazards are almost clustery accruing, shallow sliding or rock-fall. For sustained rainfall, geo-hazards have the hysteresis action with small rain-intensity. But for inducing new hazards, it needs larger rainfall after hazards occurred. Geo-hazards induced by regional rainstorm often occur in the day and space as same as the rainfall.