The 1999 Tsao-Ling Rockslide: Source Area, Debris, and Life Cycle of Associated Rockslide-Dammed Lake (Central Taiwan) (original) (raw)

Lecture Notes in Earth Sciences, 2010

Abstract

The Tsao-Ling rock avalanche was the largest landslide triggered by the 1999 Chi–Chi earthquake in central Taiwan. In addition to detailed and extensive field observations, several Digital Elevation Models (DEMs) generated from sets of aerial photos have been utilized to document and measure the coseismic and post-seismic morphological changes at Tsao-Ling. The estimated volume of the initial rock avalanche is about 125.5 and 138 Mm3 for the depleted and accumulated zones, respectively, indicating an increase in volume due to fragmentation. The average thickness was about 150–170 m, up to 195 m of the slid mass–over 140 m on the Chingshui River channel while between 30 and 90 m debris covered on the preexisting debris deposit hill. The landslide debris blocked the river channel and formed a dammed lake, with a maximum volume of 45 Mm3. In the deposit area, strong river erosion has removed 72 Mm3 of the debris since the earthquake. By August 2004, the rockslide-dammed lake had filled up completely with sediment. The filling materials originated in numerous landslides in the upstream area.

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