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| Titel |
Susceptibility analysis for landslides in the Xiangxi catchment (Three Gorges Reservoir area / China) |
| VerfasserIn |
J. Rohn, D. Ehret, W. Xiang |
| Konferenz |
EGU General Assembly 2009
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 11 (2009) |
| Datensatznummer |
250021004
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| Zusammenfassung |
| The Xiangxi River is a tributary of the Yangtze River. In 2009 the Three Gorges Reservoir
will reach its final retention water elevation level (175 m asl). Parts of the Xiangxi valley will
then flooded. Especially Jurassic sedimentary layers are predestined for intense landslides in
this area.
As a first step a landslide inventory map is produced. All slopes influenced directly by
impoundment are mapped geotechnically in detail to assess the spatial distribution of the
landslides and their shape. Furthermore, two sub-catchments in the wide-stretched
catchment area of the Xiangxi River were chosen for intense investigation. All in all,
about 200 km2will finally be mapped geotechnically in detail to provide data for
continuative investigations. The investigation fields are divided into test and training
areas for further analysis using the neural networks method. By this means the
susceptibility for landslides in dependency of different features, like lithology, slope angle,
exposition, distance to the river, etc will be analysed. In a second step the results of the
neural network analysis will be the base of a more regional landslide susceptibility
analysis for the whole catchment area of the Xiangxi River. The performance of the
method will be tested by additional inspections in areas that have been found to
have a high susceptibility for landslides. These works are part of the joint research
project “Yangtze: land use change – erosion – landslides” financed by the German
Federal Ministry of Education and Research (BMBF). Joint aim of this project is to
produce a landslide and erosion risk map for the whole region and to analyse the land
use change caused by the impoundment of the Three Gorges Dam in this area. |
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