Www.floodrisk.org.uk EPSRC Grant: EP/FP202511/1 Source-Pathway-Receptor (SPR) Modelling of Flood Impacts and Outcome Enda O’Connell, John Ewen, Greg O’Donnell,

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Presentation transcript:

EPSRC Grant: EP/FP202511/1 Source-Pathway-Receptor (SPR) Modelling of Flood Impacts and Outcome Enda O’Connell, John Ewen, Greg O’Donnell, Josie Geris Howard Wheater, Neil McIntyre, Caroline Ballard, Nataliya Bulygina Newcastle University, Imperial College London

How do local scale changes in runoff generation (the Source) propagate through the river channel network (the Pathway) to affect flooding downstream (the Receptor)? SOURCEPATHWAYRECEPTOR Key Science Question 1

SPR Modelling Framework Catchment Discretisation use metamodels and parameters to generate runoff from hydrologically similar areas (IC) 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) Hillslope model (1d,2d,3d) Regionalised Data i.e. HOST, Curve no. Hydraulic routing through dense channel network based on accurate St Venant equation solver (NU)

Hodder: SCaMP Impacts Peat: blocked Peat: drained Peat: intact Good Fair Poor Pre-changePost-change Impact on peak is small, only a few percent, but considerable uncertainty 95% prediction bounds HP

Controls on Impacts at Catchment Scale Geomorphological Dispersion: configuration of network controls arrival times of impacts at Receptor Hydrodynamic Dispersion: channel friction attenuates impacts

How can downstream flood impacts at the Receptor be tracked back through the river channel network (the Pathway) to the local Source areas that created the impact? Key Science Question 2 SOURCEPATHWAYRECEPTOR

Impact Decomposition Mapping Tool Analysing spatial contributions to impact gives answers to questions such as: Which areas are most sensitive to change? Is stocking density reduction effective? What is the importance of soil type? How does impact change with the rainfall pattern? Hodder at Hodder Place

SPR Impact Decomposition Mapping Catchment discretisation (IC) Information about local response (IC) Metamodels (IC) Hillslope model (1d,2d,3d) Regionalised Data i.e. HOST, Curve no. Hydraulic Routing (NU) Impact decomposition (NU)

Outcome 1. SPR Modelling Framework for predicting flood impacts for various configurations and mixes of land use management (LUM) changes 2. Understanding of controls on LUM flood impacts at catchment scale: roles of geomorphological and hydrodynamic dispersion 3. Decomposition Mapping Tool for use by catchment managers in assessing impacts and the effectiveness of mitigation measures