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| Titel |
On the performance of capillary barriers as landfill cover |
| VerfasserIn |
M. Kämpf, H. Montenegro |
| 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 ; 1, no. 4 ; Nr. 1, no. 4, S.925-930 |
| Datensatznummer |
250000245
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| Publikation (Nr.) |
 copernicus.org/hess-1-925-1997.pdf |
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| Zusammenfassung |
| Landfills and waste heaps require an engineered surface
cover upon closure. The capping system can vary from a simple soil cover to multiple layers of earth and geosynthetic
materials. Conventional design features a compacted soil layer, which suffers
from drying out and cracking, as well as root and animal intrusion. Capillary barriers consisting
of inclined fine-over-coarse soil layers are investigated as an alternative cover system. Under unsaturated
conditions, the textural contrast delays vertical drainage by capillary forces. The moisture
that builds up above the contact will flow downdip along the interface of the layers. Theoretical
studies of capillary barriers have identified the hydraulic properties of the layers, the
inclination angle, the length of the field and the infiltration rate as the fundamental characteristics
of the system. However, it is unclear how these findings can lead to design criteria for capillary
barriers. To assess the uncertainty involved in such approaches, experiments have been carried
out in a 8 m long flume and on large scale test sites (40 m x 15 m). In addition, the ability
of a numerical model to represent the relevant flow processes in capillary barriers has been
examined. |
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