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| Titel |
Characterization of groundwater dynamics in landslides in varved clays |
| VerfasserIn |
J. E. Spek, T. A. Bogaard, M. Bakker |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1027-5606
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| Digitales Dokument |
URL |
| Erschienen |
In: Hydrology and Earth System Sciences ; 17, no. 6 ; Nr. 17, no. 6 (2013-06-07), S.2171-2183 |
| Datensatznummer |
250018897
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| Publikation (Nr.) |
 copernicus.org/hess-17-2171-2013.pdf |
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| Zusammenfassung |
| Groundwater dynamics may play a significant role in landslides. A detailed
model is developed of the groundwater dynamics in landslides in varved clays
in the Trièves area in the French Alps. The varved clays consist of a
sequence of alternating silt and clay layers, covered by a colluvium layer
and intersected by fissures. The hydraulic conductivity of the clay layers
is negligible compared to the silt layers. It is conceptualized that
fissures form a hydraulic connection between the colluvium and the varved
clays. Groundwater recharge flows through the colluvium into the fissures,
where water is exchanged horizontally between the fissure and the silt
layers of the varved clays. Groundwater flow in the colluvium is simulated
with the Boussinesq equation, while flow in the silt layers of the varved
clays is simulated with the Richards equation. Longitudinal outflow from
the fissure is simulated with a linear-reservoir model. Scattered data of
relatively short monitoring periods is available for several landslides in
the region. A good similarity between observed and simulated heads is
obtained, especially when considering the lack of important physical
parameters such as the fissure width and the distance between the monitoring
point and the fissure. A simulation for the period 1959–2004 showed some
correlation between peaks in the simulated heads and the recorded occurrence
of landslides, while the bottom of the varved clays remained saturated during
the entire simulation period. |
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