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- W2242331879 abstract "Continual disposal of saline water in groundwater discharge areas such as saline lakes results in a layer of dense brine overlying somewhat less dense groundwater. This situation is potentially unstable and may, under certain conditions, lead to density induced convective instabilities. In this study, an idealised model of an evaporating salt lake is developed to study the governing groundwater and solute transport dynamics. The system is modelled numerically using the existing 2-D density dependent model SUTRA. Results show good qualitative agreement with an equivalent Hele-Shaw cell system. The onset of gravitational instabilities are seen to occur when the magnitude of a Rayleigh number defined in terms of basin scale hydrogeologic parameters exceeds a certain critical value. Unstable behaviour is characterised by downward convection of salt fingers or plumes, with the number of fingers or plumes decreasing with time due to coalescence and differential growth. An increase in the horizontal wavelength of the convective flow as a function of time and depth is observed as the resulting two-dimensional convection develops. This phenomena of wavelength variation is vitally important as it is the mechanism that allows for growth of wavelengths initially at the millimetre or centimetre scale to wavelengths of tens or hundreds of metres as found in nature." @default.
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- W2242331879 date "1996-01-01" @default.
- W2242331879 modified "2023-09-28" @default.
- W2242331879 title "Numerical Modeling of Convection Processes below an Evaporating Salt Lake" @default.
- W2242331879 hasPublicationYear "1996" @default.
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