Impact of earthquake-induced dammed lakes on channel evolution and bed mobility: Case study of the Tsaoling landslide dammed lake

Formation, failure, and consequences of the Xiaolin landslide dam, triggered by extreme rainfall from Typhoon Morakot, Taiwan

“…Most landslide dam disasters due to excessively rainfall or earthquake events (Schuster 1993) occur in landslideprone countries, including New Zealand (Korup 2004, Korup 2005Korup and Tweed 2007), Japan (Tabata et al 2002), China (Chen et al 1992;Dai et al 2005;Liu et al 2010), and especially Taiwan with its frequent torrential rainfall and earthquake events (Chen 1999;Shou and Wang 2003;Hsu and Hsu 2009). The floods resulting from the bursting of a landslide dam can result in serious bank erosion and inundation of populated areas and farmland near the river.…”

“…Second, the volume of the impoundment behind an earthquake-triggered landslide dam with long longevity is often too large to be discharged safely. Two very large landslide dams, Tsaoling (Hsu and Hsu 2009) and Chiufenershan (Shou and Wang 2003) and 15 smaller ones (Chen 1999) occurred in Taiwan due to the 1999 Chichi earthquake. Most of these dams were of short longevity, except the Chiufenershan landslide dam, which still exists with remedial engineering measures more than 12 years later.…”

Recent Landslide Movement in Tsaoling, Taiwan Tracked by TerraSAR-X/TanDEM-X DEM Time Series

“…One major landslide trigged by the Chi-Chi Earthquake in 1999 has led to a soil loss of about 0.1239 km 3 and notable casualties [2]. Moreover, the induced landslide lakes also pose threat to life and property nearby [3].…”

“…One major landslide trigged by the Chi-Chi Earthquake in 1999 has led to a soil loss of about 0.1239 km 3 and notable casualties [2]. Moreover, the induced landslide lakes also pose threat to life and property nearby [3]. Related researches have been extensively conducted, such as the cause of landslides [4][5][6], volumetric changes [2,7,8], the evolution of topography [1] and the mechanism behind landsides [9,10].…”

“…Related researches have been extensively conducted, such as the cause of landslides [4][5][6], volumetric changes [2,7,8], the evolution of topography [1] and the mechanism behind landsides [9,10]. However, a series of small-scale landslides occurred after 1999 with significant soil transport was not well studied, which can aslo lead to secondary disasters such as rockslide, dammed lakes and river incision [3,11]. Monitoring the spatial pattern and rate of geomorphological changes in this area is indeed vital for protecting residents' life and the ecological environment.…”