Water Infiltration into a New Three-Layer Landfill Cover System
Publication: Journal of Environmental Engineering
Volume 142, Issue 5
Abstract
One of the main purposes of a landfill cover system is to minimize the migration of water into waste, known as percolation, and thereby reduce excessive leachate production. One possible way to achieve this goal is to use a two-layer cover with capillary barrier effects (CCBEs) for arid and semi-arid regions. For a humid climate or prolonged rainfall, the two-layer system with CCBEs is expected to lose its effectiveness for minimizing water percolation. A new three-layer landfill cover system is proposed and investigated for humid climates. This new system adds a fine-grained soil (i.e., clay) underneath a two-layer barrier with CCBE (i.e., a silt layer overlying a gravelly sand layer). The study is conducted by carrying out a one-dimensional (1D) water infiltration test in a soil column. The soil column was instrumented with tensiometers, heat dissipation matric potential sensors, and moisture probes to monitor the variations of pore-water pressure and water content with depth. The amount of water volume infiltrated into the soil during ponding was also monitored. In addition, transient seepage simulations were carried out to back-analyze the soil column test and to investigate the influence of saturated permeability of clay on the effectiveness of the three-layer system. Based on the 1D experiment and numerical analysis, no percolation was observed after 48 h of constant water ponding, which is equivalent to a rainfall return period of greater than 1,000 years. This is consistent with the results from the numerical back analysis. However, the upper two-layer capillary barrier is only effective for a rainfall return period of approximately 35 years. This indicates that the proposed bottom clay layer is necessary for a humid climate. Numerical parametric simulations reveal that with an increase of saturated clay permeability by three orders of magnitude (i.e., from to ), the amount of percolation is approximately 0.1 mm after 12 h of constant water ponding, which is equivalent to a rainfall return period of greater than 1,000 years.
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Acknowledgments
The authors would like to acknowledge the research grant provided by the Research Grants Council (RGC) of the Hong Kong Special Administrative Region (HKUST6/CRF/12R) and the research grant from the National Basic Research Program (973 Program) provided by the Ministry of Science and Technology of the People’s Republic of China (2012CB719805). The support from research grant No. 51578196 provided by the National Natural Science Foundation of China is also appreciated.
References
Abdolahzadeh, A. M., Vachon, B. L., and Cabral, A. R. (2011). “Evaluation of the effectiveness of a cover with capillary barrier effect to control percolation into a waste disposal facility.” Can. Geotech. J., 48(7), 996–1009.
Albright, W. H., et al. (2006). “Field performance of a compacted clay landfill cover at a humid site.” J. Geotech. Geoenviron. Eng., 1393–1403.
Albright, W. H., Benson, C. H., and Apiwantragoon, P. (2013). “Field hydrology of landfill final covers with composite barrier layers.” J. Geotech. Geoenviron. Eng., 1–12.
Albright, W. H., Benson, C. H., and Gee, G. W. (2004). “Field water balance of landfill covers.” J. Environ. Qual., 33(6), 2317–2332.
Amaya, P., Queen, B., Stark, T. D., and Choi, H. (2006). “Case history of liner veneer instability.” Geosynth. Int., 13(1), 36–46.
ASTM. (2006). “Standard test method permeability of granular soils (constant head).” ASTM D2434, West Conshohocken, PA.
ASTM. (2007). “Standard test method for particle-size analysis of soils.” ASTM D422, West Conshohocken, PA.
ASTM. (2010a). “Standard test method for specific gravity of soil solids by water pycnometer.” ASTM D854, West Conshohocken, PA.
ASTM. (2010b). “Standard test methods for liquid limit, plastic limit, and plasticity index of soils.” ASTM D4318, West Conshohocken, PA.
ASTM. (2010c). “Standard test methods for measurement of hydraulic conductivity of saturated porous materials using a flexible wall permeameter.” ASTM D5084, West Conshohocken, PA.
ASTM. (2011). “Standard practice for classification of soils for engineering purposes (Unified Soil Classification System).” ASTM D2487, West Conshohocken, PA.
ASTM. (2012). “Standard test method for laboratory compaction characteristics of soil using standard effort.” ASTM D698, West Conshohocken, PA.
Barnswell, K. D., and Dwyer, D. F. (2011). “Assessing the performance of evapotranspiration covers for municipal solid west landfills in northwestern Ohio.” J. Environ. Eng., 301–305.
Bathurst, R. J., Ho, A. F., and Siemens, G. (2007). “A column apparatus for investigation of 1-D unsaturated-saturated response of sand-geotextile system.” Geotech. Test. J., 30(6), 1–9.
Benson, C., Abichou, T., Albright, W., Gee, G., and Roesler, A. (2001). “Field evaluation of alternative earthen final covers.” Int. J. Phytorem., 3(1), 105–127.
Benson, C., Daniel, D., and Boutwell, G. (1999). “Field performance of compacted clay liners.” J. Geotech. Geoenviron. Eng., 390–403.
Benson, C., and Khire, M. (1995). “Earthen final covers for landfills in semi-arid and arid climates.” Landfill closures, R. Dunn and U. Singh, eds., ASCE, Reston, VA, 201–218.
Bohnhoff, G., Ogorzalek, A., Benson, C., Shackelford, C., and Apiwantragoon, P. (2005). “Field data and water-balance predictions for a monolithic cover in a semiarid climate.” J. Geotech. Geoenviron. Eng., 333–348.
Bouazza, A., Zornberg, J. G., McCartney, J. S., and Nahlawi, H. (2006). “Significance of unsaturated behaviour of geotextiles in earthen structures.” Aust. Geomech. J., 41(3), 133–142.
Chinese Ministry of Water Resources. (2002). Regulation for hydrologic computation of water resources and hydropower projects SL278-2002, Beijing.
Choo, L. P., and Yanful, E. K. (2000). “Water flow through cover soils using modelling and experimental methods.” J. Geotech. Geoenviron. Eng., 324–334.
Daniel, D. E. (1994). “Surface barriers: Problems, solutions and future need.” Proc., In Situ Remediation: Scientific Basis for Current and Future Technologies, G. W. Gee and N. R. Wing, eds., Batelle Press, Washington, DC, 441–490.
Das, B. M. (2013). Fundamentals of geotechnical engineering, 4th Ed., Cengage Learning, Stamford, CT.
DSD (Drainage Services Department). (2013). Stormwater drainage manual, Hong Kong Government, Hong Kong.
EEA (European Economic Area). (2013). “Managing municipal solid waste—a review of achievements in 32 European countries.”, Copenhagen, Denmark.
GEO (Geotechnical Engineering Office). (2011). Geotechnical manual for slopes, Hong Kong.
Green, W. H., and Ampt, G. A. (1911). “Studies on soil physics. Part I: Flow of air and water in soils.” J. Agric. Sci., 4(01), 1–24.
Harnas, F. R., Rahardjo, H., Leong, E. C., and Wang, J. Y. (2014). “Experimental study on dual capillary barrier using recycled asphalt pavement materials.” Can. Geotech. J., 51(10), 1165–1177.
Hauser, V. L., Weand, B. L., and Gill, M. D. (2001). “Natural covers for landfills and buried waste.” J. Environ. Eng., 768–775.
Hillel, D. (1982). Introduction to soil physics, Academic Press, New York.
Indrawan, I. G. B., Rahardjo, H., and Leong, E. C. (2007). “Drying and wetting characteristics of a two-layer soil column.” Can. Geotech. J., 44(1), 20–32.
Iryo, T., and Rowe, R. K. (2005). “Hydraulic behaviour of soil-geocomposite layers in slopes.” Geosynth. Int., 12(3), 145–155.
Khire, M. V., Benson, C. H., and Bosscher, P. J. (1999). “Field data from a capillary barrier and model predictions with UNSAT-H.” J. Geotech. Geoenviron. Eng., 518–527.
Khire, M. V., Benson, C. H., and Bosscher, P. J. (2000). “Capillary barriers: Design variables and water balance.” J. Geotech. Geoenviron. Eng., 695–708.
Koerner, R. M., and Daniel, D. E. (1997). Final covers for solid waste landfills and abandoned dumps, ASCE, Reston, VA.
Lee, L. M., Kassim, A., and Gofar, N. (2011). “Performances of two instrumented laboratory models for the study of rainfall infiltration into unsaturated soils.” Eng. Geol., 117(1–2), 78–89.
Likos, W. (2014). “Modeling thermal conductivity dryout curves form soil-water characteristic curves.” J. Geotech. Geoenviron. Eng., 04013056.
McCarthy, E. L. (1934). “Mariotte’s bottle.” Science, 80(2065), 100.
McCartney, J. S., Kuhn, J. A., and Zornberg, J. G. (2005). “Geosynthetic drainage layers in contact with unsaturated soils.” Proc., 16th ISSMGE Conf.: Geotechnical Engineering in Harmony with the Global Environment, Mill Press, Netherlands, 2301–2305.
McCartney, J. S., and Zornberg, J. G. (2010). “Effect of infiltration and evaporation on geosynthetic capillary barrier performance.” Can. Geotech. J., 47(11), 1201–1213.
Melchior, S. (1997). “In-situ studies of the performance of landfill caps (compacted soil liners, geomembranes, geosynthetic clay liners and capillary barriers).” Land Contam. Reclam., 5(3), 209–216.
Mijares, R., and Khire, M. (2012a). “Field data and numerical modeling of water balance lysimeter versus actual earthen cap.” J. Geotech. Geoenviron. Eng., 889–897.
Mijares, R., and Khire, M. (2012b). “Field scale evaluation of lysimeters versus actual earthen covers.” Geotech. Test. J., 35(1), 31–40.
Morin, J., and Benyamini, Y. (1977). “Rainfall infiltration into bare soils.” Water Resour. Res., 13(5), 813–817.
Morris, C. E., Stormont, J. C. (1999). “Parametric study of unsaturated drainage layers in a capillary barrier.” J. Geotech. Geoenviron. Eng., 1057–1065.
Mualem, Y. (1976). “A new model for predicting the hydraulic conductivity of unsaturated porous media.” Water Resour. Res., 12(3), 513–522.
Ng, C. W. W., and Leung, A. K. (2012a). “In-situ and laboratory investigations of stress-dependent permeability function and SDSWCC from an unsaturated soil slope.” Proc., 5th Asia-Pacific Conf. on Unsaturated Soils 2012, Curran Associates, New York, 74–91.
Ng, C. W. W., and Leung, A. K. (2012b). “Measurements of drying and wetting permeability functions using a new stress-controllable soil column.” J. Geotech. Geoenviron. Eng., 58–68.
Ng, C. W. W., and Menzies, B. (2007). Advanced unsaturated soil mechanics and engineering, Taylor & Francis, London.
Ng, C. W. W., and Pang, Y. W. (2000). “Influence of stress state on soil-water characteristics and slope stability.” J. Geotech. Geoenviron. Eng., 157–166.
Olivella, S., Carrera, J., Gens, A., and Alonso, E. E. (1994). “Non isothermal multiphase flow of brine and gas through saline media.” Transp. Porous Med., 15(3), 271–293.
Parent, S. E., and Cabral, A. (2006). “Design of inclined covers with capillary barrier effect.” Geotech. Geol. Eng., 24(3), 689–710.
Rahardjo, H., Santoso, V. A., Leong, E. C., Ng, Y. S., and Hua, C. J. (2012). “Performance of an instrumented slope covered by a capillary barrier system.” J. Geotech. Geoenviron. Eng., 481–490.
Rahardjo, H., Tami, D., and Leong, E. C. (2006). “Effectiveness of sloping capillary barriers under high precipitation rates.” Proc., 2nd Int. Conf. on Problematic Soils, CI-Premier, Singapore, 39–54.
Ross, B. (1990). “The diversion capacity of capillary barriers.” Water Resour. Res., 26(10), 2625–2629.
Siemens, G., and Bathurst, R. J. (2010). “Numerical parametric investigation of infiltration in one-dimensional sand-geotextile columns.” Geotext. Geomembr., 28(5), 460–474.
Stormont, J. C., and Anderson, C. E. (1999). “Capillary barrier effect from underlying coarser soil layer.” J. Geotech. Geoenviron. Eng., 641–648.
USEPA (U.S. EPA). (1993). “Solid waste disposal facility criteria.”, Washington DC.
USEPA (U.S. EPA). (2015). “Advancing sustainable materials management: Facts and figures 2013.”, Washington DC.
van Genuchten, M. T. (1980). “A closed-form equation for predicting the hydraulic conductivity of unsaturated soils.” Soil Sci. Soc. Am. J., 44(5), 892–898.
World Bank. (2014). “Average precipitation in depth.” World development indicators, 〈http://data.worldbank.org/indicator/AG.LND.PRCP.MM〉 (Nov. 26, 2015).
Yang, H., Rahardjo, H., and Leong, E. C. (2006). “Behavior of unsaturated layered soil columns during infiltration.” J. Hydrol. Eng., 329–337.
Yang, H., Rahardjo, H., Leong, E. C., and Fredlund, D. G. (2004). “Factors affecting drying and wetting soil-water characteristic curves of sandy soils.” Can. Geotech. J., 41(5), 908–920.
Zhan, T. L. T., and Ng, C. W. W. (2004). “Analytical analysis of rainfall infiltration mechanism in unsaturated soils.” Int. J. Geomech., 273–284.
Zhan, T. L. T., Ng, C. W. W., and Fredlund, D. G. (2007). “Field study of rainfall infiltration into a grassed unsaturated expansive soil slope.” Can. Geotech. J., 44(4), 392–408.
Zornberg, J. G., Bouazza, A., and McCartney, J. S. (2010). “Geosynthetic capillary barriers: Current state of knowledge.” Geosynth. Int., 17(5), 273–300.
Zornberg, J. G., and McCartney, J. S. (2003). “Analysis of monitoring data from the evapotranspirative test covers at the rocky mountain arsenal.”, U.S. EPA.
Zornberg, J. G., and McCartney, J. S. (2005). “Evaluation of evapotranspiration from alternative landfill covers at the Rocky Mountain Arsenal.” Proc., Int. Symp. on Advanced Experimental Unsaturated Soil Mechanics, Taylor & Francis, London, 555–561.
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Published In
Journal of Environmental Engineering
Volume 142 • Issue 5 • May 2016
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© 2016 American Society of Civil Engineers.
History
Received: Apr 22, 2014
Accepted: Oct 12, 2015
Published online: Jan 11, 2016
Published in print: May 1, 2016
Discussion open until: Jun 11, 2016
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