this post was submitted on 02 Dec 2023
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Geography
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One of the things these maps massively understate is the effect of tides and wave action as the sea levels rise.
I have seen estimates that in low-lying non-rock coastlines a 1m rise in sea level can lead to a 100m retreat in the coastline due to storms and wave erosion.
This is an aspect of sea level rise that I started to think about after moving to the shore of a large reservoir created by damming a river.
The difference between high water (late spring or early summer) after spring runoff and low water (late winter or early spring) is frequently 5 metres or more. The steep, sometimes vertical, terrain is just deeper water at the shoreline. The beaches and low lying terrain might see the shoreline move as much as 100 metres with maybe 5 times that incursion along seasonal creek beds.
If the water gets higher than usual, it can overtop a small rise and fill a basin, adding a hundred meters to the extent of a shoreline overnight.