Txt-tool 2.084-3.1 rainfall thresholds for triggering geohazards in bac kan province (vietnam)

Abstract

This paper presents the integration of several developed methods to establish rainfall thresholds for triggering any type of geohazards in data-scarce areas. In the developed procedure, it is important to obtain the exact dates of the past disastrous events such as landslides, floods, river bank erosion, debris flows, etc. For the case study area of Bac Kan province, the available data comprises of historic information of 14 geohazard events that occurred in some years from 1986 to 2010 and in 2013, and daily rainfall values during this period. The results show that the relationships between the daily rainfalls and the 7 days-antecedent rainfalls are of very important to trigger series of disastrous events in Bac Kan province. It is a simple and useful approach to applying to the contexts that lack detailed data of a specific geohazard type. This approach is going to be further developed to obtain more accurate thresholds not only for Bac Kan province but also for other areas with similar setting by updating more information on historic geohazard events.