Barrier between sweet and salt waters

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"HE[GOD] has let free the two bodies of flowing water, meeting together: between them is a Barrier which they do not transgress" [Quran 55:19-20] Early commentators of the Quran were unable to explain the two opposite meanings for the two bodies of water, i.e. they meet and mix and at the same time there is a barrier between them. Modern science has discovered that in the places where two different seas meet, there is a barrier between them. Oceanologists are now in a better position to explain this verse. When the water from one sea enters the other sea, it loses its distinctive characteristic and become homogenized with the other water. In a way this barrier serves as a transitional homogenizing area for the two waters. Read another verse: "It is HE who has let free the two bodies of flowing water: One palatable & sweet, and the other salty & bitter; yet has HE made a barrier between them, and a partition that is forbidden to be passed." [Quran 25:53] Modern Science has discovered that in estuaries, where fresh [sweet] and salty water meet, the situation is somewhat different from that found in places where two salt water sea meet. what distinguishes fresh water from salt water in estuaries is a 'pycnocline zone with a marked density discontinuity separating the two layers.' salinity differs at this zone of separation. This Scientific phenomena mentioned in the Quran was also confirmed by Dr. William Hay, a well-known marine scientist and profession of Geological Sciences at the University of Colorado, USA.