Diffuse pollution modelling for
Catchment Management
Using Scimap to model fine sediment
sources, pathways and impacts
– a...
• Background – how rivers trusts use Scimap to
tackle diffuse pollution
• Running the model – assumptions and
limitations
...
• Rivers trusts are an incorporated charitable vehicle
for catchment management that in principle anyone
in the catchment ...
RiversTrust approach to diffuse
pollution
• Started around 1996 with
theWRT projectTamar2000
and the ‘river-wise plan’
• W...
Mitigating for diffuse pollution at
the farm scale
• Buffer strips
• Stock exclusion
• Cover crops
• Contour ploughing
• D...
Using data & models for catchment
planning
1. Assess river condition & diagnose threats
• Monitor & survey
• Characterise ...
Pollutant Level + Mobilisation + Connectivity = Pollution risk
SOURCE PATHWAY RECEPTOR
Pollutant Level + Mobilisation + Connectivity = Pollution risk
SOURCE PATHWAY RECEPTOR
Sediment Impacts
Background
UpstreamThinking
UpstreamThinking
Upscaling to the catchment
Source Pathway Receptor
Can we identify
sources at a
catchment
scale?
Can we identify
unseen
pa...
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;...
Data preparation
Running the model
Model Assumptions and
Limitations
• Resolution of DEM
• Grips, drains, roads, g
ateways, perched
channels alter flow
paths...
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
S...
• MyScimap – online tool funded by Durham
University,The RiversTrust and Environment
Agency
o Users will be able to run mo...
Where next?
Thank you for your attention
michelle@theriverstrust.org
Using Scimap to target diffuse pollution control
Using Scimap to target diffuse pollution control
Using Scimap to target diffuse pollution control
Using Scimap to target diffuse pollution control
Using Scimap to target diffuse pollution control
Using Scimap to target diffuse pollution control
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Using Scimap to target diffuse pollution control

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USing the Scimap modelling framework to identify areas in river catchments at greatest risk of generating and transporting diffuse sediment pollution in to rivers.

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  • RT have reviewed catchment plans from many of the pilots – common theme is the importance of data and information to:Identify solutions and inform strategic managementEngage stakeholders, influence land owners and identify, explain and deliver ‘win-win’ outcomesMonitor outcomes and identify what is and isn’t working to feedback through the adaptive management loop
  • It’s not just about sharing data. Moving up the data continuum is about engaging people – if you build the understanding together then you can use the knowledge to influence behaviour – that’s when it becomes wisdom. For this to work it can’t just be about academics, consultants and specialists combining datasets and presenting outputs then expecting interventions to happen. Experience shows that if the end audience isn’t engaged at every stage, they don’t buy in to the modelling and so they don’t believe the outputs or understand the level of uncertainty, so providing access to data AND derived information AND knowledge is crucial.
  • Using Scimap to target diffuse pollution control

    1. 1. Diffuse pollution modelling for Catchment Management Using Scimap to model fine sediment sources, pathways and impacts – a presentation to NIEA, 25th April 2013 Michelle Walker Head of GIS & Data Management The RiversTrust
    2. 2. • 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
    3. 3. • 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 ONTHE GROUND What is a rivers trust?
    4. 4. RiversTrust approach to diffuse pollution • Started around 1996 with theWRT projectTamar2000 and the ‘river-wise plan’ • Walk the river & watercourses • Identify evidence of pollution • Follow pathway • Identify source & additional factors
    5. 5. 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
    6. 6. 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 of measures Assessment of outcomes
    7. 7. Pollutant Level + Mobilisation + Connectivity = Pollution risk SOURCE PATHWAY RECEPTOR
    8. 8. Pollutant Level + Mobilisation + Connectivity = Pollution risk SOURCE PATHWAY RECEPTOR
    9. 9. Sediment Impacts
    10. 10. Background
    11. 11. UpstreamThinking
    12. 12. UpstreamThinking
    13. 13. 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?
    14. 14. Land use Slope Rainfall SCIMAP: A diffuse pollution risk modelling framework
    15. 15. SCIMAP: A diffuse pollution risk modelling framework
    16. 16. • www.scimap.org.uk • Free to download for non-commercial use Using the Scimap Model
    17. 17. • LandcoverMap 2007 (CEH); Corine 2000; Rural Payments Agency; Local Knowledge; Remote sensing • Ordnance Survey; Nextmap; LIDAR • Met Office Data requirements Land use Slope Rainfall
    18. 18. Data preparation
    19. 19. Running the model
    20. 20. Model Assumptions and Limitations • Resolution of DEM • Grips, drains, roads, g ateways, perched channels alter flow paths • Doesn’t replace walkover • Surface flow v ground water catchments • Changing land use and timing
    21. 21. Improving the model
    22. 22. Incising drainage ditches in the DEM to reflect altered drainage paths
    23. 23. • Improving the model Using the Scimap Model
    24. 24. Analysing and visualising outputs
    25. 25. • 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 Siltation Redox values Scimap erosion risk and connectivity Inadequate buffer strips Engage farmers & deliver interventions Walkover confirms arable runoff
    26. 26. • MyScimap – online tool funded by Durham University,The RiversTrust and Environment Agency o 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?
    27. 27. Where next? Thank you for your attention michelle@theriverstrust.org

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