Abstract
The joint surge-tide probability method for estimating the frequency of occurrence of extreme high sea levels is particularly useful when only a few years of sea level observations are available for the location of interest. The standard approach at present involves the convolution of the probability density functions of the tidal and surge elevations to obtain the distribution of total water level. An alternative approach is discussed here which is an adaptation of an existing, but different, method to render it suitable for application in many British and European locations. The two methods are applied to the major port of Portsmouth in Southern England and are critically compared.
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