Thank you for the welcome! :)

You are not alone, I've experienced tsunami dreams (and other natural disasters). I guess you could interpret it by how you felt at the time of the dream. For me, there was a fear of being swept away -

They say that in your dreams water represents emotions. So If the water is clear, sparkling and beautiful then you are in a good emotional state. Alternatively, if the water is deep, murky and frightening