The relationships between suspended sediment and landslide in typhoon events, East of Taiwan
Date Issued
2010
Date
2010
Author(s)
Tseng, Yu-Lun
Abstract
This study used the Synchrotron Radiation analyzing the minerals composition in suspended sediment along the catchments of Beinan and Hualian River. The landslide areas were measured by using the Formosa II images from 2008 to 2009. We try to find the relationship between the rainfall, sediments discharge, minerals contents with landslide.
Investigation results indicated that the landslide ratio ranged from 1.17% to 1.79% in Beinan watersheds in the post Jangmi Typhoon 2008 and the ranged from 1.42% to 4.5% in the post Morakot Typhoon. The landslide ratio ranged from 1.29% to 2.90% in Hualian watersheds in the post Jangmi Typhoon 2008 and the ranged from 1.53% to 3.72% in the post Morakot Typhoon. The mineral composition analysis reveals that the major minerals of study area include Albite, Biotite, Calcite, Chlorite-serpentine and Quartz. The contents of fine fraction have a positive relation when the flow discharge less than 40m3/s. The contents of fine fraction will descend to 10% when the flow discharge over 40m3/s. When fine fraction have a positive relation when the flow discharge over than 500m3/s. Post Typhoon, the weight of minerals have a positive relation when the landslide ratio higher.
Subjects
X-ray
Suspended Sediment
Mineral
Typhoon
Landslide ratio
Type
thesis
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