I would like to put forward my view and observation. We have two miscible liquids with slightly different specific gravity. Take an example of alcohol which has Sp Gr. around 0.8 and water is 1.0. Now pour water in a glass half full and then alcohol gradually. It will form three zones. Lower water, intermediate is mixed (dispersed) one and upper is alcohol. Now reverse the procedure. Put alcohol first and then water and we will get mixture and no zones. Coming back to fresh water and sea water interface. Flow direction of water is from river and it flows over sea water before it get churned. Calm water will show distinct difference. Thanks for raising the issue and food for thought. I am giving a link for a diagram which shows dispersion of fresh and saline water phenomenon. https://www.google.co.in/search?q=fresh-saltwater+interface&espv=2&biw=1366&bih=599&source=lnms&tbm=isch&sa=X&ved=0ahUKEwi5ztSj3czLAhXSC44KHX7kCJ8Q_AUIBigB#imgrc=ofTEd-xMKG-goM%3A

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I would like to put forward my view and observation. We have two miscible liquids with slightly different specific gravity. Take an example of alcohol which has Sp Gr. around 0.8 and water is 1.0.
Now pour water in a glass half full and then alcohol gradually. It will form three zones. Lower water, intermediate is mixed (dispersed) one and upper is alcohol.
Now reverse the procedure. Put alcohol first and then water and we will get mixture and no zones.
Coming back to fresh water and sea water interface. Flow direction of water is from river and it flows over sea water before it get churned. Calm water will show distinct difference.
Thanks for raising the issue and food for thought.
I am giving a link for a diagram which shows dispersion of fresh and saline water phenomenon.

https://www.google.co.in/search?q=fresh-saltwater+interface&espv=2&biw=1366&bih=599&source=lnms&tbm=isch&sa=X&ved=0ahUKEwi5ztSj3czLAhXSC44KHX7kCJ8Q_AUIBigB#imgrc=ofTEd-xMKG-goM%3A


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