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| Titel |
A conceptual model of the hydrological influence of fissures on landslide activity |
| VerfasserIn |
D. M. Krzeminska, T. A. Bogaard, Th. W. J. Asch, L. P. H. Beek |
| 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 ; 16, no. 6 ; Nr. 16, no. 6 (2012-06-01), S.1561-1576 |
| Datensatznummer |
250013320
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| Publikation (Nr.) |
 copernicus.org/hess-16-1561-2012.pdf |
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| Zusammenfassung |
Hydrological processes control the behaviour of many unstable slopes, and
their importance for landslide activity is generally accepted. The presence
of fissures influences the storage capacity of a soil and affects the
infiltration processes of rainfall. The effectiveness of the fissure network
depends upon fissure size, their spatial distribution, and connectivity.
Moreover, fissure connectivity is a dynamic characteristic, depending on the
degree of saturation of the medium.
This research aims to investigate the influence of the fissure network on
hydrological responses of a landslide. Special attention is given to spatial
and temporal variations in fissure connectivity, which makes fissures act
both as preferential flow paths for deep infiltration (disconnected
fissures) and as lateral groundwater drains (connected fissures). To this
end, the hydrological processes that control the exchange of water between
the fissure network and the matrix have been included in a spatially
distributed hydrological and slope stability model. The ensuing feedbacks in
landslide hydrology were explored by running the model with one year of
meteorological forcing. The effect of dynamic fissure connectivity was
evaluated by comparing simulations with static fissure patterns to
simulations in which these patterns change as a function of soil
saturation. The results highlight that fissure connectivity and fissure
permeability control the water distribution within landslides. Making the
fissure connectivity function of soil moisture results in composite
behaviour spanning the above end members and introduces stronger seasonality of the
hydrological responses. |
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