3.2.2 Sea-level Rise
According to projections for high emissions scenarios5,6,
sea-levels could rise by up to one metre by 2100.
Moreover, according to the Intergovernmental Panel
on Climate Change, projections for global sea-levels
show could be even greater than one metre.
Hoi An experiences significant tidal variations, with
high-tides reaching a maximum height of 1.55 metres above mean sea-level. Given the low-lying topography
of much of the city, coupled with this tidal variation,
even a small increase in sea-levels could lead to
a substantial increase in the land area inundated by
sea-water and salinity. According to the map in Figure
8, 53.46 hectares could be permanently inundated by
sea water by 2020, rising to 69.64 hectares in 2050
and 87.38 hectares in 2100. These scenarios are calculated
under a high emissions scenario and assuming
no adaptation actions will be taken.