Flooding caused by sea water is referred to as coastal inundation. It can be caused by high tides, in combination with elevated sea level driven by wind and low air pressure, the size and frequency of waves and the dynamics at the sea-land interface. Coastal inundation events are exacerbated by rising sea levels. Sea levels rise for two reasons: the first is the added water from the melting of ice on land (floating ice does not add to sea level as it melts), the second is from thermal expansion of the oceans as the seas warm.
For the latest please see XDI Climate and Hazard Modelling Methodology documentation.