The person above is a quite right on some things, but on some maybe not.
I'm good at dream int and symbolism, so I can probably tell you what most of these mean; in a nutshell.
Symbolises turbulance, problems, cleansing. A destructive end, but followed by a new start. Usually found if going through relationship problems. Incoming problem that will sweep you away.
Protection, Inability to accept, blocking, shunning away. Could imply that maybe you are ignoring a problem? Or just protecting yourself from emotions that are coming to you. I forgot to mention, Tidal Waves can also represent mixed emotions.
And water may well be your affinity, but I doubt such a thing would come to you in a dream. Maybe. Perhaps. Unlikely. Your element is the one you feel most connected to, comfortable with, represents you, your personality, etc.