Gas transport parameters for compacted reddish - brown soil in Sri Lankan landfill final cover
Gas transport parameters for compacted reddish - brown soil in Sri Lankan landfill final cover
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DOI：
10.1061/(asce)hz.1944-8376.0000078
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发表时间：
2011-10
期刊：
影响因子：
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通讯作者：
P. Wickramarachchi;K. Ranasinghe;S. Hamamoto;K. Kawamoto;U. Nawagamuwa;P. Møldrup;T. Komatsu
中科院分区：
文献类型：
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作者：
P. Wickramarachchi;K. Ranasinghe;S. Hamamoto;K. Kawamoto;U. Nawagamuwa;P. Møldrup;T. Komatsu
通过压实的最终覆盖土壤在垃圾填埋场的气体交换起着至关重要的作用，排放，命运和运输的有毒垃圾填埋气体。这项研究涉及测量土壤气体扩散率（DP/DO，在土壤和自由空气中的气体扩散系数的比率）和空气渗透性（ka）的不同压实的土壤样品（红棕色土壤）从最终覆盖在斯里兰卡的Maharagama垃圾填埋场。通过标准普罗克特压实或手动压实至1.60-1.94 g cm-3的干堆密度来制备样品。现有的和修改后的模型预测Dp/Do和ka进行了测试对测量数据。简单的，单参数白金汉模型预测的Dp/Do值在压实水平同样好或优于干容重（DBD）依赖模型和土壤水分保持（SWR）依赖模型。不同压实样品的实测ka值受压实水平和样品水分制备方法的影响很大。所以，fo…
Gas exchange through the compacted final cover soil at landfill sites plays a vital role for emission, fate, and transport of toxic landfill gases. This study involved measuring the soil-gas diffusivity (Dp/Do, the ratio of gas diffusion coefficients in soil and free air) and air permeability (ka) for differently compacted soil samples (reddish-brown soil) from the final cover at the Maharagama landfill in Sri Lanka. The samples were prepared by either standard Proctor compaction or hand compaction to dry bulk densities of 1.60–1.94 g cm-3. Existing and modified models for predicting Dp/Do and ka were tested against the measured data. The simple, single-parameter Buckingham model predicted measured Dp/Do values across compaction levels equally well or better than a dry bulk density (DBD) dependent model and a soil-water retention (SWR) dependent model. The measured ka values for differently compacted samples were highly affected by the compaction level and the sample moisture preparation method. Also, fo...