A geophysical investigation of saline water in the chalk of the South Coast of England

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Abstract
Summary: The Chalk on the South Coast of England between the rivers Adur and Ouse is in hydraulic continuity with the sea. Certain pumping stations up to 3.5 km from the shoreline have shown in the past abnormal chloride ion concentrations which have been considered to be due to seawater intrusion into the aquifer. Geophysical logging of boreholes especially drilled for the purpose close to the shoreline has confirmed the presence of saline water at various horizons, and has also shown diurnal variations in salinity due to the tide and seasonal variations related to infiltration and groundwater abstraction rates.

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