STUDYING LANDSLIDES IN THUA THIEN - HUE PROVINCE

Abstract

Studying landslide hazards in Thuathien - Hue is based on the relationship between landslide and its controlling factors (topographical slope, rainfall, landuse, weathering crust, lithological properties, fault and road proximity), evaluated in a key areas. This relationship is quantified by weighting the classes in each factor and weighting each factor in a set of landslide-controlling factors. This is the bases for landslide susceptibility mapping given by integrating the weighted factor maps. The class is weighted by its landslide density, normalized on a 1-to-9 scale. The factor weighting is determined based on the landslide quantity, which would be engendered in a whole province with considering the
landslide density in each class as that obtained from the key area. The calculated results show that, influences of landslide-controlling factors in Thuathien - Hue may increase in following order: road proximity, landuse, weathering, fault, lithology, rainfall, and slope. The areas of very low, low, medium, high and very high landslide hazards account
respectively 12,36%, 15,34%, 39,69%, 31,89% and 0,82% of province. The high and very hazards are distributed in linear form, suggesting a strong influence of faults in these areas.

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