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Land management impacts on flood flows across scales

Land management impacts on flood flows across scales. Howard Wheater, Neil McIntyre, Caroline Ballard, Nataliya Bulygina, Beth Jackson Brian Reynolds, Miles Marshall, Imogen Solloway, Zoe Frogbrook John Ewen, Enda O’Connell, Greg O’Donnell, Josie Geris

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Land management impacts on flood flows across scales

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  1. Land management impacts on flood flows across scales Howard Wheater,Neil McIntyre, Caroline Ballard, Nataliya Bulygina, Beth Jackson Brian Reynolds, Miles Marshall, Imogen Solloway, Zoe Frogbrook John Ewen, Enda O’Connell, Greg O’Donnell, Josie Geris Imperial College London, Newcastle University, CEH Bangor

  2. Key science questions • At the local scale, how does a given change in land use or management affect local (e.g. farm-scale) flooding? • How does a local scale impact propagate downstream, and how do many different local scale impacts combine to affect flooding at larger scales?

  3. The Pontbren experiment • Major investment in data by FRMRC • A unique multi-scale multi-disciplinary experiment • Strong stakeholder involvement Pontbren land use

  4. The Hodder experiment (SCaMP) Funded by the Environment Agency Grip blocking Tree planting Stock exclusion

  5. Pontbren: Empirical evidence Clear effects: Over time and space at plot scale Over space at small catchment scale Tree plot Ungrazed plot Grazed plot

  6. Hodder: Empirical evidence No visible effects: Over time at catchment scale

  7. New modelling approach Information about local response either small scale parameters included in a physics based model, or regionalised indices (IC) Metamodels reproduce the responses produced by the small-scale model and/or the regionalised indices (IC) Regionalised Data i.e. HOST, Curve no. Hillslope model (1d,2d,3d) Hydraulic routing through dense channel network based on accurate St Venant equation solver (NU) Catchment Discretisation use metamodels and parameters to generate runoff from hydrologically similar areas (IC)

  8. Example results

  9. Summary Increasing return period Increasing scale Maximum effect Minimum/(no?) effect Long term experiments essential to isolate land management effects

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