Field Hydrology of Landfill Final Covers with Composite Barrier Layers
| Autor: | William H. Albright, Craig H. Benson, Preecha Apiwantragoon |
|---|---|
| Rok vydání: | 2013 |
| Předmět: |
Hydrology
Water balance Hydrology (agriculture) Geosynthetic clay liner Geomembrane Hydrologic Evaluation of Landfill Performance Evapotranspiration Environmental science Geotechnical engineering Geotechnical Engineering and Engineering Geology Surface runoff Final cover General Environmental Science |
| Zdroj: | Journal of Geotechnical and Geoenvironmental Engineering. 139:1-12 |
| ISSN: | 1943-5606 1090-0241 |
| DOI: | 10.1061/(asce)gt.1943-5606.0000741 |
| Popis: | AstudywasconductedatsevensitesacrosstheUnitedStatestoevaluatethe fieldhydrologyof finalcoverswithacompositebarrier (a geomembrane over a soil barrier or a geosynthetic clay liner) for final closure of landfills. The water balance of each cover was monitored withalarge(10320m)instrumenteddrainagelysimeter.Withoneexception,thecoverslimitedtheaverageannualpercolationto,2.8mm/year (,0.4%ofprecipitation).Thegeomembranebarrieratonesite(Marina,California)waslikelydamagedduringconstruction;percolationatthis site averaged 30 mm/year (6.9% of precipitation). The annual percolation through the cover at the wettest site (Cedar Rapids, Iowa) ranged between0.1and6.2mm/year.Theannualpercolationataridandsemiaridsiteswastypicallynomorethanatrace(,0.1mm/year).Percolation fromalltestcoversgenerallywascoincidentwithhighwaterstorageinthesurfacesoillayerandlateral flowinthedrainagelayeronthesurface of the geomembrane barrier. Water balance predictions were made with the hydrologic evaluation of landfill performance model using site- specific input. Surface runoff was overpredicted and evapotranspiration underpredicted when as-built soil hydraulic properties were used as input. Better agreement was obtained when in-service soil hydraulic properties were used as input. The lateral flow was consistently overpredicted regardless of the hydraulic properties, and no correspondence existed between the predicted and measured percolations. DOI: 10.1061/(ASCE)GT.1943-5606.0000741. © 2013 American Society of Civil Engineers. |
| Databáze: | OpenAIRE |
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