The free acid (H+) from this reaction will cause the weathering of soil minerals discussed above ... Communities and landscapes directly on the coast will also receive salt spray, derived from wave ...

“Salt weathering is a phenomenon commonly observed ... As per a study in 2013, the Mahabalipuram coast had undergone erosion of up to 177 metres in the past 41 years from the year of the study.

This is probably not how it actually happened, but scientists haven't been able to add much more than to say “it's a weathering thing ... rain and intensive salt weathering.