Investigation of the hydraulic characteristics of prepared porous media indicate that a ten per cent increase in air content of media voids is capable of producing a 15 pct reduction in ‘effective porosity,’ a 35 pct decrease in permeability, and about 50 pct reduction in hydraulic dispersion. The location of bubbles in large or small pores affects the uniformity of pore sizes and determines the amount of water saturated void volume which is isolated by air bubbles. The shape of the chloride tracer ‘breakthrough’ curve is greatly modified by changes in uniformity of pore size. An appreciation of the effects of gas accumulation is essential to a proper interpretation of the hydraulic behavior of natural formations.
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