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Streambed Sediment as a Barrier to Groundwater Pollution: Insights from Fieldwork and Modelling in the River Thames Basin (1993)

YOUNGER, P. L. ; MACKAY, R. ; CONNORTON, B. J.

Oxford, UK : Blackwell Publishing Ltd

Water and environment journal 7 (1993), S. 0

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ISSN: 1747-6593

Source: Blackwell Publishing Journal Backfiles 1879-2005

Topics: Energy, Environment Protection, Nuclear Power Engineering

Notes: Integrated fieldwork and modelling has been undertaken to assess the vulnerability of riverside wells to pollution when river water is contaminated. Results highlight the importance of streambed sediments as a barrier to groundwater pollution by river water. The bed of the River Thames is lined with brown and grey organic-rich silts of low hydraulic conductivity (about 0.002 m/d). A 3-D model for solute transport in stream-aquifer systems was developed and applied to two riverside sites in the middle Thames valley. Model results indicate that well-water quality would only breach EC limits if the river was heavily polluted for a week or even a month (clearly an unlikely scenario). Sensitivity analyses showed the models to be far more sensitive to streambed parameters than to aquifer parameters. Thus it would be more sensible to focus fieldwork on the measurement of streambed properties than on the more usually measured aquifer parameters.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1111/j.1747-6593.1993.tb00890.x

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Noise problems with ephemeral streams in aquifer models (1983)

Connorton, B. J. ; Wood, W. L.

Chichester : Wiley-Blackwell

International Journal for Numerical Methods in Fluids 3 (1983), S. 201-208

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ISSN: 0271-2091

Keywords: Aquifer Model ; Leakage ; Noise ; Averaging ; Engineering ; Engineering General

Source: Wiley InterScience Backfile Collection 1832-2000

Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics

Notes: Previous papers12 have drawn attention to the sustained oscillations (‘noise’) in the solution by successive over-relaxation of the equations from the finite difference approximation of regional groundwater flow including ephemeral streams. This paper shows that the trouble can be avoided by introducing an averaging step in the algorithm; the trouble can also be avoided by ‘under-relaxation’ but this is far less efficient than averaging.

Additional Material: 6 Ill.