Abstract
Movement of light immiscible liquids, or light non-aqueous-phase liquids (LNAPLs), within a fissured rock mass is a function of the properties of the immiscible fluid, the fracture network, and the groundwater regime. A conceptual model of field-scale LNAPL behaviour in a network of fractures is described, assuming an impermeable matrix. Within the unsaturated zone, LNAPL is considered to be wetting with respect to air, and will tend to migrate downdip under the influence of gravity within available fractures. Significant lateral migration of LNAPL can occur, depending on the spill volume, and the fracture orientations. Relatively small volumes of LNAPL contained within vertical or subvertical fractures can produce significant connected vertical heights (and thus pressure heads) of LNAPL. Hence, despite being lighter than water, LNAPL can penetrate into the saturated zone, depending on the connected vertical height of LNAPL, the density of the liquid, and the characteristics of the fracture. In larger-ape...
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