Impact of the Capillary Fringe on Local Flow, Chemical Migration, and Microbiology
Impact of the Capillary Fringe on Local Flow, Chemical Migration, and Microbiology
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毛细管边缘对局部流动、化学迁移和微生物学的影响
DOI：
10.2136/vzj2004.0534
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发表时间：
2004
影响因子：
2.8
通讯作者：
A. Dunn
中科院分区：
文献类型：
--
作者：
B. Berkowitz;S. Silliman;A. Dunn
我们批判性地考察了历史和最近对毛细血管边缘(CF)内局部尺度的流动和运输的研究。近50年来，土壤科学和水文学领域对水通过的地下路径的特征--以及这些路径对化学物质的移动和地下微生物种群生存能力的影响--进行了深入的研究。然而，对CF内局部通路的复杂性的考虑在很大程度上被忽视了。最近的研究以及一些历史上的研究都报告了在CF内观察到的流体流动和化学物质运输，强调了CF与地下水位以下区域之间的物理非均质性以及水和化学物质交换的影响。这些观察得出的结论是，在当地尺度上，Cf可能对从非饱和地下水向饱和地下水过渡区域存在的自然地球化学和微生物条件的影响比通常假设的要大得多。在这里，我们检查潜在的物理因素，控制当地的流动和运输行为在林区和跨林区，并说明这些因素通过检查在实验室收集的图像。我们还提供了一个简短的文献综述。认为现有的CF值定义不足以描述地下水位附近的流动和输运行为。我们建议用部分饱和条纹的概念来取代CF的概念，这涉及到地下水位附近(包括地下水位上方和下方)的多相传输。
We critically examine historical and recent studies of flow and transport at the local scale within the capillary fringe (CF). The characterization of subsurface pathways traveled by water—and the impact of these pathways on the movement of chemicals and the viability of subsurface microbial populations—has been the subject of intensive investigation in the last 50 yr in the fields of soil science and hydrology. However, consideration of the complexity of local pathways within the CF has been largely ignored. Recent studies, as well as some historical ones, have reported observations of fluid flow and chemical transport within the CF, emphasizing the impact of physical heterogeneity and exchange of water and chemicals between the CF and the region below the water table. These observations lead to the conclusion that the CF may affect, at the local scale, the natural geochemical and microbial conditions present in the region of transition from unsaturated to saturated groundwater flow far more significantly than is usually assumed. Here, we examine underlying physical factors that control local flow and transport behaviors in and across the CF and illustrate these factors through examination of images collected in the laboratory. We also provide a brief survey of the literature on the CF. It is argued that existing definitions of the CF are inadequate to describe flow and transport behavior in the vicinity of the water table. We suggest replacing the concept of the CF with the concept of a partially saturated fringe, which involves multiphase transport in the immediate vicinity of (both above and below) the water table.
影响因子：
3.6
作者：
Henry, EJ;Smith, JE
通讯作者：
Smith, JE