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Re-evaluating dual-porosity effects at the site of a seminal groundwater modelling study: Tilmanstone, Southern England

Re-evaluating dual-porosity effects at the site of a seminal groundwater modelling study: Tilmanstone, Southern England
Re-evaluating dual-porosity effects at the site of a seminal groundwater modelling study: Tilmanstone, Southern England
The first numerical model of solute transport to incorporate Fickian diffusive exchange between mobile fracture water and immobile porewater for an actual case of groundwater contamination at catchment scale was applied to the Chalk aquifer at Tilmanstone in SE England by Bibby (Water Resources Research, 1981, 17, 1075–1081). The unconfined aquifer at Tilmanstone had been contaminated by coalfield brine leaking from disposal lagoons operating throughout much of the twentieth century. Recent observations show that the Bibby model underestimates dual-porosity diffusive retardation, and hence underestimates the persistence of contamination, probably by several decades. 2D representation of the aquifer in plan ignored the hydrostratigraphy, and model calibration was limited by the lack of time-variant paired profiles of fracture water and porewater. Vertical profiles through the Chalk determined by packer testing, borehole dilution testing and geophysical logging, together with a new depth profile of chloride concentration in Chalk matrix porewater, are described. The hydrostratigraphy is interpreted in relation to the Chalk lithostratigraphy of SE England, and incorporated into a vertical-section model of chloride transport along the axis of the valley, consistent with the new and historical profiles of fracture water and porewater chloride concentrations. New predictions of the longevity of the chloride contamination at Tilmanstone are presented.
0305-8719
227-248
Watson, S.J.
938c9114-5166-4560-914d-201fd86e7b48
Burgess, W.G.
2419c10e-cf7b-458d-9820-ec9e619e73eb
Barker, J.A.
33bf9dec-cc9b-451c-8192-46099e316b6d
Watson, S.J.
938c9114-5166-4560-914d-201fd86e7b48
Burgess, W.G.
2419c10e-cf7b-458d-9820-ec9e619e73eb
Barker, J.A.
33bf9dec-cc9b-451c-8192-46099e316b6d

Watson, S.J., Burgess, W.G. and Barker, J.A. (2012) Re-evaluating dual-porosity effects at the site of a seminal groundwater modelling study: Tilmanstone, Southern England. [in special issue: Groundwater Resources Modelling: A Case Study from the UK] Geological Society London Special Publications, 364, 227-248. (doi:10.1144/SP364.15).

Record type: Article

Abstract

The first numerical model of solute transport to incorporate Fickian diffusive exchange between mobile fracture water and immobile porewater for an actual case of groundwater contamination at catchment scale was applied to the Chalk aquifer at Tilmanstone in SE England by Bibby (Water Resources Research, 1981, 17, 1075–1081). The unconfined aquifer at Tilmanstone had been contaminated by coalfield brine leaking from disposal lagoons operating throughout much of the twentieth century. Recent observations show that the Bibby model underestimates dual-porosity diffusive retardation, and hence underestimates the persistence of contamination, probably by several decades. 2D representation of the aquifer in plan ignored the hydrostratigraphy, and model calibration was limited by the lack of time-variant paired profiles of fracture water and porewater. Vertical profiles through the Chalk determined by packer testing, borehole dilution testing and geophysical logging, together with a new depth profile of chloride concentration in Chalk matrix porewater, are described. The hydrostratigraphy is interpreted in relation to the Chalk lithostratigraphy of SE England, and incorporated into a vertical-section model of chloride transport along the axis of the valley, consistent with the new and historical profiles of fracture water and porewater chloride concentrations. New predictions of the longevity of the chloride contamination at Tilmanstone are presented.

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Published date: 2012
Organisations: Infrastructure Group

Identifiers

Local EPrints ID: 397660
URI: https://eprints.soton.ac.uk/id/eprint/397660
ISSN: 0305-8719
PURE UUID: 2ca1a89b-128b-4e18-a85a-1ead235fa384

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Date deposited: 01 Jul 2016 12:59
Last modified: 15 Jul 2019 20:18

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