Environmental Geology

, Volume 48, Issue 3, pp 320–335 | Cite as

Utilising seasonal variations in hydrogeochemistry and excitation-emission fluorescence to develop a conceptual groundwater flow model with implications for subsidence hazards: an example from Co. Durham, UK

  • J. Lamont-Black
  • A. Baker
  • P. L. Younger
  • A. H. Cooper
Original Article


Groundwaters were sampled from four research boreholes, a private supply well and a natural karst resurgence in southern County Durham, England. Time series data sets of piezometric levels, groundwater major ions, and fluorescence of dissolved organic matter (DOM) were interpreted in the light of new geological mapping to assess the movement of groundwater and its potential for the dissolution of gypsum. Three distinct groundwater facies were identified representing contact with gypsiferous strata, dolomitic limestone and Quaternary Till. Piezometric data indicated time varying transverse flow across the gypsifeorus strata, which was confirmed from gradational mixing of groundwater types and cation ratios. Fluorescence of dissolved DOM identified variations in protein and fulvic-like acid fluorescence. The former was taken to represent surface derived, short-lived material. Spatial and temporal variations in protein fluorescence offered a means to trace groundwater movement along the regional groundwater gradient and indicated rapid lateral movement of groundwater. It was concluded that gypsum dissolution is occurring beneath the town of Darlington, however, the presence of a thick deposit of Quaternary till effectively confines the small head differences of approximately 1 m, across the gypsum strata beneath the town. Further to the south, the lowering of the ground surface results in a greater upwards flow of water across the gypsum and is used to explain the presence of historic collapse sinkholes.


Groundwater tracing Subsidence Fluorescence DOM Gypsum Karst County Durham England 



Darlington Borough Council and Northumbria Water Limited are thanked for their support to the research in terms of the provision of boreholes and water quality analyses. The authors acknowledge the contribution made towards this work by the ROSES (Risk of Subsidence due to Evaporite Solution) Project: ENV4-CT97-0603 and IC20-CT97-0042 funded by the EU Framework IV Programme.


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Copyright information

© Springer-Verlag 2005

Authors and Affiliations

  • J. Lamont-Black
    • 1
  • A. Baker
    • 2
  • P. L. Younger
    • 3
  • A. H. Cooper
    • 4
  1. 1.ELECTROKINETIC LtdNanotechnology CentreNewcastle upon TyneUK
  2. 2.School of Geography, Earth and Environmental SciencesUniversity of BirminghamUK
  3. 3.HERO, IRES(Institute of Research on Environmental Sustainability)University of Newcastle Newcastle upon TyneUK
  4. 4.British Geological SurveyNottinghamUK

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