Application of Geographic Information System with the Probability of Landslide Model for Assessing Landslide Hazard in the Eastern Thailand
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Abstract
The study of debris flow landslide in the Eastern Thailand applies Geographic Information System (GIS) and landslide probability model by using maximum daily rainfall data from 9 precipitation stations for assessing landslide hazard map at 5, 10, 50, and 100 year return periods. The results showed that most high-risk areas were located in Trat and Chanthaburi Provinces especially in Banthat Mountain Range and Khao Soi Dao Mountain areas. The probability of landslide in the Eastern region of Thailand would gradually increase along with the longer return period scenario. For 100 year return period, areas with 80% probability of landslide would expand to cover 25 percent of the total area of the eastern Thailand. Furthermore, this research also revealed the damage cost from landslide in the eastern region. The average landslide damage cost in the eastern region is approximately 0.4 million Baht per square kilometer at 5 year return period with the increasing effect to 1.8 million per square kilometer at 100 year return period.
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