Calculate Flood Return Period using Tide Gauge Data 

GeoTide calculates the floodreturn period as a function of seadefence height using tidegauge measurements 

The combined effect of the astronomical tide and weather induced residual tide can result in tidal flooding. Atmospheric pressure and wind causes this residual tide, when large such fluctuations are known as tidal surges. Surges can be surprisingly frequent. For example, around the East coast of the UK, surges of one or even two meters occur many times per year. Being caused by weather, tidal surges cannot be tabulated in advance.
Surges can occur at any time, often they will occur during neap tides or spring low tides, in which case overtopping almost certainly will not occur. However, when surges occur near a spring high tide, overtopping of sea defences is much more likely. The statistics of flooding is therefore the result of the combined effect of the statistics of the astronomical tide and the statistics of the residual tide, this is known as the joint probability method or JPM. Using this method, GeoTide provides statistical estimates of the floodreturn probability and floodfrequency for a given height of seadefence.


© 2022 Copyright Geomatix
