Abstract
Abstract This paper presents work conducted at Imperial College on the mobility of a gas phase through a partially saturated porous medium. The research is based on the observation of the behaviour of a discrete gas phase in place rather than on gas in solution. The experiments were designed to ensure that chemical reactions and the nucleation of the gas phase were kept to a minimum if not prevented. Glass micromodels of porous media were used to allow visual analysis of the movement of the gas phase in a partially saturated porous medium under conditions of rapidly changing head. Both conditions of heavy localized rainfall or rapid increase in atmospheric pressure, and rapidly changing water levels are simulated. Images of gas bubble positions, sizes and frequencies under given potentials are analysed using a Geographical Information System (GIS) to enable the bubble population to be quantified in time and space. From these studies conclusions concerning the behaviour of the gas phase under these conditions have become apparent. These have significant implications for the monitoring of gas emissions and movement of gas in situ .
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