Landslides are a disaster event caused by heavy rainfall in mountainous areas and it occurs in many countries including Thailand, especially in northern and southern regions. This problem is still arising and likely to escalate in the future. Long-time torrential rainfall is often the cause of landslide. Generally, landslide warning is done by checking rainfall amounts compared to critical rainfall amounts triggering landslides in the past. The objectives of the research are to determine critical rainfall amounts for landslide warning in Thailand. In this research, critical rainfall amounts in terms of duration and severity appropriate for Thailand were determined by a study on landslide records in the past and rainfall amount records and the scope of critical rainfall amounts were then determined. Analytical results found that critical rainfall amounts in each area were different and duration of rainfall used in probability assessment of landslides was 4 days. Rainfall amounts were divided into two sections: rainfall amounts in the past 3 days and daily rainfall amount on the day of consideration. The results could be applied to landslide warning in Thailand.
Santi Thaiyuenwong, Rajamangala University of Technology Rattanakosin, Thailand
Stream: South-East Asian Studies (including Thailand, Vietnam, Cambodia, Laos)
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