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Assessing the impacts of climate change
on a chalk valley riparian wetland, UK
Andrew House13, Mike Acreman1, James Sorensen2, Julian Thompson3
1 Centre for Ecology and Hydrology, Wallingford, UK. Email: [email protected] British Geological Survey, Wallingford, UK 3 UCL Department of Geography, University College London, UK
The River Lambourn Observatory
600 m reach of the River Lambourn &
10 ha riparian wetland
(c) Roger Key
Conservation & scientific interest
(c) Floodplain Meadows
Partnership
Conceptual Model
House, A.R., Sorensen, J.P.R., Gooddy, D.C., Newell, A.J., Marchant, B., Mountford, J.O., Scarlett, P., Williams, P.J. and Old, G.H. (2015) Discrete wetland groundwater
discharges revealed with a three-dimensional temperature model and botanical indicators (Boxford, UK). Hydrogeology Journal. DOI 10.1007/s10040-015-1242-5
Upwelling Areas
MIKE SHE
Calibration & Validation
Calibration 1/2/2013–1/12/2013
Validation 1/12/2013–1/10/2014
ParameterCalibrated
value
Unsaturated zone infiltration rate (ms-1) 2.30 × 10-5
Peat horizontal hydraulic conductivity (ms-1) 1.98 × 10-5
Peat vertical hydraulic conductivity (ms-1) 9.53 × 10-6
Gravel horizontal hydraulic conductivity (ms-1) 2.93 × 10-4
Gravel vertical hydraulic conductivity (ms-1) 6.98 × 10-4
Manning’s n coefficient for overland flow (sm-1/3) 0.03
Model Performance
Peat heads Channel stageGravel heads
Climate Change Scenarios
HadRM3 GW
P ET
Q
Climate Change Factors
ET
GW
P
Q
Hydrological Impact: Water levels
Hydrological Impact: Flooding
Baseline HighLow
Water Level Requirements
(c) H. Zell
(c) Guido Gerding
(c) Bio-Foto
Wheeler, B.D., Gowing, D.J.G. , Shaw, S.C., Mountford, J.O. and Money, R.P. (2004) Ecohydrological Guidelines for Lowland Wetland Plant Communities (Eds. Brooks, A.W.,
Jose, P.V. and Whiteman, M.I.). Environment Agency (Anglian Region)
Ecological Impact: Vegetation
Ecological Impact: Snails
Winter Summer
0.6
0.4
-0.2
0.2
0
-0.4
-0.6
-0.8
Tattersfield, P., and McInnes, R. (2003). Hydrological requirements of Vertigo moulinsiana on three candidate Special Areas of Conservation in England (Gastropoda,
Pulmonata: Vertiginidae). Heldia, 5(7), 135-147. Snail images (c) iStockphoto LP
Conclusions
Stay tuned...
Impacts on environmental flows in
channel - fish habitat suitability
Link to nutrient/contaminant transport
model
Impacts of abstraction and site
management
Acknowledgements
Mike Acreman
Daren Gooddy
Ben Marchant
Andy Newell
Colin Roberts
Pete Scarlett
James Sorensen
Charlie Stratford
Julian Thompson
Barry Townsend
Sebastian Uhlemann
Pete Williams
