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Re-assessing the flood risk in Scotland
1Department of Geography, University of Dundee, UK. a.z.black@dundee.ac.uk
The Science of the Total Environment
|August 10, 2002
Summary
Flood risk in Scotland has increased, particularly in western regions, with more frequent extreme flood events observed since 1988. Analysis of flood records and climate patterns indicates a significant shift in flood risk dynamics.
Area of Science:
- Hydrology
- Climate Science
- Environmental Risk Assessment
Background:
- Recent extreme floods in Scotland highlight growing flood damages.
- Climate change impacts on flood risk are a significant concern.
- Changes in flood risk estimation methods and data re-analysis are critical.
Purpose of the Study:
- To review changes in flood risk estimation for Scottish rivers.
- To analyze trends in flood frequency and magnitude.
- To assess the influence of climate change on flood risk.
Main Methods:
- Analysis of nine longest peaks-over-threshold (POT) flood series for Scottish rivers.
- Review of flood modelling based on historical rainfall and temperature records.
- Examination of UK Flood Estimation Handbook and historic flood data.
Main Results:
- Annual POT frequencies increased in western Scotland during the 1980s/1990s to record highs.
- Eastern Scotland experienced highest flood frequencies in the 1950s/1960s.
- Eight of Scotland's 16 largest rivers recorded maximum flows since 1988, indicating an extreme flood cluster.
Conclusions:
- Shifts in flood risk are linked to increased westerly airflows, consistent with climate change modelling.
- Flood risk has demonstrably increased in many parts of Scotland.
- The assumption of stationarity in flood risk estimation is challenged by observed changes.