Using Scimap to target diffuse pollution control
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Transcript of Using Scimap to target diffuse pollution control
Diffuse pollution modelling for Catchment
ManagementUsing Scimap to model fine sediment
sources, pathways and impacts
– a presentation to NIEA, 25th April 2013
Michelle WalkerHead of GIS & Data Management
The Rivers Trust
• Background – how rivers trusts use Scimap to tackle diffuse pollution
• Running the model – assumptions and limitations
• Analysing and visualising outputs
• Where next?
• Demos: preparing data, running the model, 3D visualisation
• Rivers trusts are an incorporated charitable vehicle for catchment management that in principle anyone in the catchment community can use to:
o Raise money from charitable and other sources
o Provide necessary governance for funds
o Employ people, enter in to contracts, make commitments as if a company but free from personal liability
o DELIVER WORK ON THE GROUND
What is a rivers trust?
Rivers Trust approach to diffuse pollution
• Started around 1996 with the WRT project Tamar2000 and the ‘river-wise plan’
• Walk the river & watercourses
• Identify evidence of pollution
• Follow pathway• Identify source &
additional factors
Mitigating for diffuse pollution at the farm
scale• Buffer strips• Stock exclusion• Cover crops• Contour ploughing• Dirty water separation• Rain water collection• Moving gateways• Soil testing, fertiliser
optimisation & nutrient management
Using data & models for catchment planning
1.Assess river condition & diagnose threats
• Monitor & survey
• Characterise risk areas
2.Deliver catchment management interventions
• Create tailored plans
• Deliver interventions
3.Evaluate delivery of environmental & 2o outcomes
Justification/investigation
Delivery ofmeasures
Assessment of outcomes
Pollutant Level + Mobilisation + Connectivity = Pollution risk
SOURCE PATHWAY RECEPTOR
Pollutant Level + Mobilisation + Connectivity = Pollution risk
SOURCE PATHWAY RECEPTOR
Sediment Impacts
Background
Upstream Thinking
Upstream Thinking
Upscaling to the catchment
Source Pathway Receptor
Can we identify sources at a catchment
scale?
Can we identify unseen
pathways to the river for
interception?
Can we identify cumulative
diffuse pollution & route it back
to source areas?
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Land use
Slope
Rainfall
SCIMAP: A diffuse pollution risk modelling framework
SCIMAP: A diffuse pollution risk modelling framework
• www.scimap.org.uk
• Free to download for non-commercial use
Using the Scimap Model
• LandcoverMap 2007 (CEH); Corine 2000; Rural Payments Agency; Local Knowledge; Remote sensing
• Ordnance Survey; Nextmap; LIDAR
• Met Office
Data requirements
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Land use
Slope
Rainfall
Data preparation
Running the model
Model Assumptions and Limitations
• Resolution of DEM• Grips, drains,
roads, gateways, perched channels alter flow paths
• Doesn’t replace walkover
• Surface flow v ground water catchments
• Changing land use and timing
Improving the model
Incising drainage ditches in the DEM to reflect altered drainage paths
• Improving the model
Using the Scimap Model
Analysing and visualising outputs
• Need to move from catchment data & information to knowledge & wisdom
• All stakeholders need access to the information
Sharing Information for Catchment Planning
Data
Information
Knowledge
Wisdom
Understanding relationships
Understanding patterns
Understanding principles
Building a common understanding
SiltationRedox values
Scimap erosion risk and
connectivity
Inadequate buffer strips
Engage farmers & deliver
interventions
Walkover confirms arable runoff
• MyScimap – online tool funded by Durham University, The Rivers Trust and Environment Agencyo Users will be able to run model with
default data, and generate catchment on the fly
o Or upload own higher resolution DEM, landuse, etc.
o View outputs in web map or download
•Scimap user group•Video ‘how to’ guides coming soon:
www.scimap.org.uk
Where next?
Where next?
Thank you for your [email protected]