(1973) n°3 - Royal Academy for Overseas Sciences

— 599 —
tion points exist above and below the interface, (figure 10c),
but each point involves a stagnation stream-line which lies inside
the mixing layer. It can be shown that the amount of dissolved
salt moving to the upper sink decreases rapidly as uodo is increased
beyond the value of 1/2. Thus, it is quite possible to
selectively withdraw in the upper sink fresh water only slightly
contaminated and of great economical importance. The saline
water pumped from the lower sink can of course be discharged
somewhere else.
January 5, 1973
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