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| Titel |
Tracking and evolution of irrigation triggered active landslides by multi-source high resolution DEM: The Jiaojiacun landslide group of Heifangtai (Northwest of China) |
| VerfasserIn |
Runqiang Zeng, Xingmin Meng, Siyuan Wang, Guan Chen, Yajun Lee, Yi Zhang |
| Konferenz |
EGU General Assembly 2014
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 16 (2014) |
| Datensatznummer |
250087295
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| Publikation (Nr.) |
 EGU/EGU2014-1327.pdf |
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| Zusammenfassung |
| The construction of three large hydropower stations, i.e. Liujia, Yanguo and Bapan,
resulted in the immigration of the impacted people to Heifangtai from 1960s. To
support the living and farming of the immigrated people, a large amount of water has
been pumped from the Yellow River to Heifangtai, which has changed the former
underground water budget and led to 111 landslides from 1968 in this area. To reveal
the deformation process of landslides in Heifangtai, a quantitative deformation
analysis model of landslide based on multi-source DEM data is established using four
periods of topographic maps obtained in 1970, 2001, 2010 and 2013 respectively,
including two 1:10000 topographic maps and two 1:1000 data acquired from 3D
Laser Scanner. The whole study area was divided into two sections based on the
two distinct kinds of landslide patterns. The selected morphometric parameters,
residual topographic surface and surface roughness, extracted from three typical
landslides, and the statistical analysis (Box-plot diagrams) of the temporal variations of
these parameters, allowed the reconstruction and tracking of these landslides. We
monitored the changing of landslide boundaries, average vertical and horizontal
displacement rates and zones of uplift and subsidence. The volumes of removed
and/or accumulated material were estimated as well. We can then demonstrate the
kinematics of landslides based on information from high-resolution DEM, and the
changing table of underground water, ring-shear test and soil-water characteristic curve
referenced from other researchers. The results provide a new insight on the use of
multi-source high resolution DEM in the monitoring of irrigation-triggered landslides. |
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