Systemic impacts of climate change on an eroding coastal region over the twenty-first century |
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| Authors: | Mark E Dickson Mike J A Walkden Jim W Hall |
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| Institution: | (1) National Institute of Water and Atmospheric Research, PO Box 8602, Riccarton, Christchurch, New Zealand;(2) Tyndall Centre for Climate Change Research, School of Civil Engineering and Geosciences, Newcastle University, Newcastle upon Tyne, UK |
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| Abstract: | A numerical model detailing the functioning and emergent behaviour of an eroding coastal system is described. Model output
from a 50-km study region centred on the soft-rock shore of northeast Norfolk was verified through comparison with cliff recession
rates that were extracted from historical maps spanning more than a century. Predictions were then made for the period 2000
to 2100 under combined climatic change and management scenarios. For the scenarios evaluated, the model was relatively insensitive
to increases in offshore wave height and moderately sensitive to changes in wave direction, but the most important effects
were associated with accelerated sea-level rise (SLR). In contrast to predictions made using a modified version of the Bruun
rule, the systems model predicted rather complex responses to SLR. For instance, on some sectors of coast, whereas the Bruun
rule predicted increased recession under accelerated SLR, the systems model actually predicted progradation owing to the delivery
of sediment from eroding coasts up-drift. By contrast, on coasts where beaches are underlain by shore platforms, both the
Bruun rule and the systems model predicted accelerated recession rates. However, explicit consideration of the interaction
between beach and shore platform within the systems model indicates that these coasts have a broader range of responses and
lower overall vulnerability to SLR than predicted by the Bruun rule. |
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