Assessing the impacts of climate change on a chalk valley...
Transcript of Assessing the impacts of climate change on a chalk valley...
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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
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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
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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
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Upwelling Areas
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MIKE SHE
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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
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Model Performance
Peat heads Channel stageGravel heads
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Climate Change Scenarios
HadRM3 GW
P ET
Q
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Climate Change Factors
ET
GW
P
Q
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Hydrological Impact: Water levels
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Hydrological Impact: Flooding
Baseline HighLow
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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)
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Ecological Impact: Vegetation
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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
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Conclusions
Stay tuned...
Impacts on environmental flows in
channel - fish habitat suitability
Link to nutrient/contaminant transport
model
Impacts of abstraction and site
management
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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