There are two mechanisms for mixing

There are two mechanisms for mixing at a liquid-liquid interface, firstly diffusion and secondly physical agitation.

Diffusion is negligably slow in liquids, it takes days for solutes to travel a few centimetres, so the mixing is dominated by physical agitation e.g. wave action, convention currents, wind mixing etc.

In this particular case it's hard to judge what effect waves and wind have. The sea looks very calm, so I'd guess that waves and wind have little effect and it's not that surprising that mixing is slow. I bet that line wouldn't be as well defined the morning after a storm.

This sort of divison isn't that unusual. I grew up in Khartoum where the White Nile and the Blue Nile meet, and the division between them remains sharp for miles. Although I don't have any snaps from that era (I was five :-) the following picture found with google images shows the division nicely.

結果 (中文) 1:

有两种机制为首先在液-液界面上，混合扩散和第二物理搅拌。扩散是 negligably 在液体中缓慢，它需天溶质旅行几厘米，所以混合由物理搅拌如波行动，公约电流，风混合等。在此特定情况下，很难判断影响波和风有什么。大海看起来很平静，所以我猜波和风影响很小，它不是那么令人惊讶，混合缓慢。我的赌注，线会以及定义一场暴风雨后的清晨。这种分工并非罕见。我长大了在喀土穆白尼罗河和蓝色尼罗河见面和他们之间司仍然锋利英里。虽然我没有任何从那个时代的快照 (:-) 在五岁以下图中发现与谷歌图片衬托出来了该司。

結果 (中文) 2:

有用于在液-液界面，首先扩散和第二物理搅拌混合两种机制。

扩散在液体中的negligably慢，需要天的溶质的旅行几厘米，因此混合通过物理搅拌例如波动作为主，约定的电流，风混合等。

在这里面很难判断什么样的影响波浪和风有这种特殊情况。海看起来很平静，所以我猜想，波浪和风毫无效果，它不是那么奇怪，混合速度很慢。我敢打赌，该行不会还有早上在暴风雨后确定。

这类divison是不是不寻常。我在喀土穆长大，白尼罗河与青尼罗河相会，以及它们之间的分工依然尖锐英里。虽然我没有从那个时代任何卡扣（我五岁:-)与谷歌的图像中找到如下图所示的划分很好。