Spreading of a NAPL lens in a double-porosity medium |
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| Authors: | Victor Ryzhik |
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| Institution: | (1) Department of Civil Engineering, The Technion, Haifa, 32000, Israel |
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| Abstract: | Spreading of a non-aqueous phase liquid (NAPL) denser than water (DNAPL) lens (mound) in the unsaturated zone of double-porosity
aquifer above an impervious plane boundary is investigated. The double-porosity aquifer is conceptualized as a fracture network
surrounding pervious blocks. Vertical gravity equilibrium is assumed to prevail in each one of the two media, fractures and
blocks. Through vertical integration, two coupled partial differential equations for the DNAPL content in each medium are
obtained. The mass exchange rate between high- and low-permeability media is considered as a function of NAPL content. The
dominant effect is gravity, whereas capillary forces are negligible. Analytical solutions for one-dimensional and axisymmetric
problems of mound spreading are obtained. |
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| Keywords: | aquifer contamination double-porosity medium NAPL mound spreading unsaturated zone |
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