Evaluation of Deferent Daily Cover Using Hydrus 2d/3d Simulation

• The most important trends in landfill management policy over the last decade have been the universal adoption of the containment approach to emission control and the increasing legal requirement to install artificial membranes as bottom liners and caps to landfills which is now mandatory in many countries. The landfill cover is one of the most important aspects when designing and constructing landfills. The cover should minimize the quantity of water that infiltrates to the body of the solid waste landfills, reduce the rate of leachate generation, segregate solid waste from the surrounding environment, and control the risk of additional groundwater contamination and gas migration. Landfill covers are not standardized. Different covers have been proposed and executed all over the world. The selection of the suitable cover type is a big challenge especially in arid and semi-arid countries. Jordan is considered to be a semi-arid country. In Jordan, more than 20 landfills are in operation. Landfilling practiced in Jordan is generally dumping the waste in trenches with leveling and compacting by trash compactors to reduce the size and the thickness of the layers, and finally covering the waste with 0.5 m from the landfill soil in daily basis. This cover usually ends to be the cap during landfill working time and sometimes after closing. To assess the efficiency of a certain cover with particular concentration on landfills in arid and semi-arid areas, many field studies should be adopted along an extensive time period, confirming the efficiency of the landfill cover. Cost, time, and labor demands are still the major obstacles for conducting such field studies. Other methods should be considered for evaluation of the landfill cover efficiency and also supporting correct evaluation of the performance of landfill covers. Numerical simulation with appropriate soil parameters is an inexpensive, fast, and labor saved tool for modeling water flow and solute transport in saturated and unsaturated media.

Subject headings

TEKNIK OCH TEKNOLOGIER  -- Samhällsbyggnadsteknik -- Vattenteknik (hsv//swe)

ENGINEERING AND TECHNOLOGY  -- Civil Engineering -- Water Engineering (hsv//eng)

SAMHÄLLSVETENSKAP  -- Annan samhällsvetenskap (hsv//swe)

SOCIAL SCIENCES  -- Other Social Sciences (hsv//eng)

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