| Autor: |
Orford, J.D., Carter, R.W.G. |
| Zdroj: |
Marine Geology; August 1995, Vol. 126 Issue: 1-4 p201-211, 11p |
| Abstrakt: |
The possibility by which the retreat of a swash-aligned, gravel barrier on Nova Scotia's Atlantic coast may be influenced by varying mesoscale time domains of differential process conditions is examined. Tide gauge data are used to generate definition of mesoscale process domains regarded as influential in barrier behaviour. Semi-diurnal, high water tidal residuals from Halifax (Nova Scotia) tide gauge (1920–1990) are characterised for both surge magnitude and frequency on an annual basis. These two variables are combined to define three event types of annual surge histories. First-order, nth-step Markov analyses show that significant memory exists in 6-year and 22-year transitions between surge event types. The longer transition sequence mirrors a major decadal mesoscale domain change in surge generation which is suggested to be associated with phases of barrier crest reworking that enhance barrier retreat when the domain change occurs. The shorter transition sequence may reflect cyclonic activity cycles on the Scotian Shelf superimposed on the longer-term transition. |
| Databáze: |
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