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HS9.5/GM9.11

The Role of Geomorphology in Flood Risk Management (co-organized)| PICO Session
Convener: Ian Pattison  | Co-Conveners: Tom Coulthard , Heather Haynes , Sarah Twohig 
PICO
 / Wed, 20 Apr, 10:30–12:00  / PICO spot 1
There is pretty wide acceptance that trends exist in flood records for both increasing frequency and magnitude. However, what are more debated are the causes of these changes. Traditionally, flood risk management has focussed on the hydrological drivers, including the impact of climate and land management change. However, there are other catchment controls which have received less attention until recently. The flood system is a complex interaction of hydrological, geomorphological and anthropogenic factors. The aim of this session is to explore the geomorphological drivers of flood risk, including sediment delivery, bed elevation change (aggradation/degradation), bank erosion, and planform morphological change. Furthermore, the linkages between these geomorphological changes and hydrology and engineered infrastructure allow holistic assessment of flood risk attribution and therefore assessment of management options. Specific topics of interest could include, but are not limited to: impacts of climate and land use change on sediment delivery; quantifying changes in channel capacity due to erosion and deposition, changes in stage-discharge relationships, effect of channel modifications and structures e.g. bridges, weirs, dams on sediment transport, modification of natural geomorphological processes by human activity, evaluation of flood defence structures, and how scientific research can inform policy and best practice management approaches.