On the basis of 49 borehole studies at the mid- and upper-stream of the Dajia and Jhuoshuei river basins, landslide occurrence was found to not only be related to subsurface geological composition and hydrogeological characteristics, but also to groundwater level dynamics, which have seldom been addressed in previous works. It is suggested that the interplay between hydrogeologic and landslide factors be given further consideration in future investigations. This would be a crucial step towards effective disaster prevention for mountainous regions in Taiwan.
Key Words : Borehole hydrogeologic investigation, hydrogeologic characteristics, landslide.
〔1〕Geo-technical Engineering Research Center, Sinotech Engineering Consultants, Inc., Taipei, Taiwan.
〔2〕Geological Resources Division, Central Geological Survey, Ministry of Economic Affairs, Taipei, Taiwan.
〔3〕Environmental & Engineering Geology Division, Central Geological Survey, Ministry of Economic Affairs, Taipei, Taiwan. * Corresponding Author. E-mail : jjlin@sinotech.org.tw