A STUDY ON LANDSLIDE EARLY WARNING SYSTEM CONSIDERING THE EFFECT OF ANTECEDENT RAINFALL ON SLOPE STABILITY

摘要

This study discusses the applicability of landslide early warning method considering the effect of antecedentrainfall on slope stability. First, as a typical example of the method, the antecedent precipitation index, API method,which has been developed to use as the index for landslide early warning by covering the wide landslide prone areasin Thailand is introduced. Second, the basic concept of newly-developed Modified API, MAPI method, whichconsiders the reduction of moisture stored into subsoil by antecedent rainfall records observed in Nakhon Nayok,Thailand, is presented. The results present that there are similarities not only between pore water pressure at the oldsliding plane and API but also between API and MAPI.