2018 Volume 55 Issue 5 Pages 232-242
The Hai Van landslide area in central Vietnam is geologically composed of fractured and deeply weathered granitic rocks. Under the geological and weather condition, the Hai Van landslide has repeatedly activated during the monsoon rainy season. It is significant to clarify the relation between the hydrogeological structure of weathered and unweathered rocks and landslide activity, and subsequently to assess the risks of landslide disaster.
Here we provide new information about the distinctive hydrogeological structure of the landslide in relation to landslide movement by investigating various data derived from the literature of precedence researches, a drilling survey, water quality analyses of samples from springs and boreholes, and also quantitative measurements of landslide movement. As a result, the hydrogeological structure clearly indicates that the landslide response is sensitive to water pressure exerted through groundwater channels in the fractured and deeply weathered granitic rocks in the Hai Van landslide area.
This research was carried out as a part of the Japan－Vietnam joint research project “Development of Landslide Risk Assessment Technology along Transport Arteries in Vietnam.
