Extreme Compaction Effects on Gas Transport Parameters and Estimated Climate Gas Exchange for a Landfill Final Cover Soil
Extreme Compaction Effects on Gas Transport Parameters and Estimated Climate Gas Exchange for a Landfill Final Cover Soil
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DOI：
10.1061/(asce)gt.1943-5606.0000459
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发表时间：
2011-07
影响因子：
3.9
通讯作者：
S. Hamamoto;P. Møldrup;K. Kawamoto;P. Wickramarachchi;M. Nagamori;T. Komatsu
中科院分区：
文献类型：
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作者：
S. Hamamoto;P. Møldrup;K. Kawamoto;P. Wickramarachchi;M. Nagamori;T. Komatsu
垃圾填埋场作为大气甲烷的一个重要来源，与温室变暖情景有关。在这项研究中，极端压实的两个主要的土-气输运参数，气体扩散系数（Dp）和固有的空气渗透率（ka），以及在填埋场覆盖土壤的累积甲烷氧化速率的影响进行了研究。非常压实的垃圾填埋场覆盖土表现出可忽略不计的非活性土壤-空气含量的DP和KA。此外，在相同的土壤-空气含量（e）下，与正常压实土壤相比，观察到更大的Dp和ka，这可能是因为在极端压实下减少了水阻塞效应。这些现象不包括在现有的预测模型Dp（e）和ka（e）。在实测数据的基础上，建立了新的Dp（e）和ka（e）预测模型，模型参数（代表孔隙连通性和水堵效应）表示为干密度（ρB）的函数。本文提出的Dp（e）和ka（e）模型是一种新的线性模型。
Landfill sites have been implicated in greenhouse warming scenarios as a significant source of atmospheric methane. In this study, the effects of extreme compaction on the two main soil-gas transport parameters, the gas diffusion coefficient (Dp) and the intrinsic air permeability (ka), and the cumulative methane oxidation rate in a landfill cover soil were investigated. Extremely compacted landfill cover soil exhibited negligible inactive soil-air contents for both Dp and ka. In addition, greater Dp and ka were observed as compared with normal compacted soils at the same soil-air content (e), likely because of reduced water-blockage effects under extreme compaction. These phenomena are not included in existing predictive models for Dp(e) and ka(e). On the basis of the measured data, new predictive models for Dp(e) and ka(e) were developed with model parameters (representing air-filled pore connectivity and water-blockage effects) expressed as functions of dry density (ρb). The developed Dp(e) and ka(e) m...