Antecedent Rainfall Thresholds for the Triggering of Deep-Seated Landslides (Case study: Chaharmahal & Bakhtiari Province, Iran)

Rainfall is recognized as one of the main triggering factors of landslides. Researchers have long attempted to determine the amount of precipitation required to trigger slope failures. One of the landslide zones in Iran is Chaharmahal & Bakhtiari province where many landslides cause high casualties in recent decades. It is significant that most of these landslides occur after a rainy period. Thus, determination of rainfall thresholds in this province seems to be necessary as the first step to present an effective landslide warning system. In this research, we tried to introduce some antecedent rainfall thresholds for deep-seated landslides. The antecedent periods considered for the events examined in this study were ۵, ۱۰, ۱۵, ۲۰, ۲۵, ۲۸ and ۳۰ days. Since most of landslides occurred by cumulative rainfall for more than ۱۰ days, the results of ۵ days and shorter time periods appear not logically connected. We have also established rainfall thresholds for the ۱۵-day antecedent period and ۲, ۳ and ۵ days rainfall events. Results indicate that for ۱۰ to ۳۰ days antecedent periods, mean total rainfall needed to induce landslides varies between about ۱۴۰ and ۲۸۰ mm. Finally, we recommend more research on relation between rainfall characteristics and destabilization of different soil classes in the study area (especially clayey-marly deposits).

کلیدواژه ها:

Antecedent rainfall ، Chaharmahal & Bakhtiari ، Landslide ، Threshold