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Catastrophic landslides and debris flows in Thailand

  • N. Phien-Wej
  • P. Nutalaya
  • Zin Aung
  • Tang Zhibin
Article

Abstract

Extremely intense rainfall of November 1988 in Southern Thailand triggered the worst natural disaster of the country. Widespread slope failures took place in the mountainous and hilly areas in the region that was previously considered to have low risk of landslides. Most slope failures occurred in the vicinity of the steep granitic Khao Luang Mountains where several villages along their rims were almost wiped out by catastrophic debris flows. This paper summarizes findings of a post-event study to determine the characteristics of the slope failures and their relation to geological setting, weathering characteristics, slope gradient, land use practice (vegetation cover) and rainfall intensity. Engineering characteristics of the weathered granite which was the predominant medium involved in the slope failures was also studied.

Keywords

Debris Flow Slope Failure Slope Gradient Residual Soil Intense Rainfall 

Glissements de terrain et chutes de débris à effets catastrophiques en Thaïlande

Résumé

Des pluies torrentielles en novembre 1988 dans le sud de la Thaïlande ont provoqué le pire des désastres naturels que le pays ait connu jusqu'à présent. De nombreux glissements de terrain se sont produits dans cette région de montagnes et collines, considérée jusqu'alors comme une région à faible risque. La plupart des ruptures se sont produites dans le voisinage des montagnes escarpées de granite de Khao Luang, où plusieurs villages en bordure ont pratiquement été anéantis par les coulées de débris. Cet article présente les résultats d'une étude postérieure aux événements, effectuée dans le but de déterminer les caractéristiques des glissements et leur relation avec la structure géologique, les caractéristiques climatiques, le gradient de pente, les pratiques agraires (couvert végétal) et l'intensité des pluies. Les propriétés structurelles du granite altéré qui était le principal faciès concerné par les glissements, ont également été examinées.

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Copyright information

© International Association of Engineering Geology 1993

Authors and Affiliations

  • N. Phien-Wej
  • P. Nutalaya
  • Zin Aung
  • Tang Zhibin
    • 1
  1. 1.Asian Institute of TechnologyBangkokThailand

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