PATHWAYS OF DYE TRACER MOVEMENT THROUGH STRUCTURED SOILS ON A MACROSCOPIC SCALE
PATHWAYS OF DYE TRACER MOVEMENT THROUGH STRUCTURED SOILS ON A MACROSCOPIC SCALE
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宏观尺度上染料示踪剂在结构化土壤中的移动路径
DOI：
10.1097/01.ss.0000126838.81093.20
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发表时间：
2004
期刊：
影响因子：
--
通讯作者：
K. McInnes
中科院分区：
文献类型：
--
作者：
M. Nobles;L. Wilding;K. McInnes
据报道，结构特征、生物孔隙和滑溜层是影响污染物向浅层地下水含水层的旁通流的重要特征。本研究的目的是确定在宏观尺度上的水和溶质运移的途径，并确定在两个变性土和一个淋溶土的溶质流动的可见特征。通过绘制染料流动路径，研究了结构特征在溶质运移中的相对参与，如ped界面、根通道和光滑面。根和interpedal孔作为运输在所有三种土壤中的主要途径。变性土中的滑面裂隙是溶质运移的次要通道。溶质流沿着slickenside表面观察主要是当染料溶液通过相邻的根通道输送到slickenside的表面。观察到的染料途径分布的差异与不同类型的结构特征的丰度、其明显的连续性、互连性和大孔进入浸润染料前沿有关。横向运输被确定为流量的主要组成部分之一，即使网站位于近水平，轻轻倾斜的地貌表面。
Structural features, biopores, and slickensides have been reported to be important features impacting bypass flow of pollutants to shallow groundwater aquifers. The objectives of this research were to identify the pathways of water and solute transport at a macroscopic scale and to identify visible characteristics of solute flow in two Vertisols and one Alfisol. Relative involvement of structural features in solute transport, such as ped interfaces, root channels, and slickenside planes, were studied by mapping dye flow paths. Roots and interpedal pores served as major pathways of transport in all three soils. Slickenside fissures in Vertisols served as minor pathways of solute transport. Solute flow along slickenside surfaces was observed primarily when the dye solution was delivered to the surface of the slickenside via the adjacent root channel. The differences in observed distribution of dye pathways were related to the abundance of different types of structural features, their apparent continuity, interconnectivity, and macropore access to the infiltrating dye front. Lateral transport was identified as one of the major components of the flow, even though the sites were located on nearly-level to gently sloping geomorphic surfaces.