Mixing of fluid streams in rivers

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Studiot
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Walking round a local amenity area today brought this photo of a side stream cut off by the local river in spate flowing past from left to right in the picture.

The river water is reddy brown and the side stream grey-green.
The two waters are not mixing as can be seen by the well defined boundary.
 

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This happens at many confluences, the most recent I've personally seen is at the confluence of the Monongahela and Allegheny rivers in Pittsburgh, PA. It's pretty neat to see.
 
What would you have expected it to look like?

The grey green needs to somehow transition to the reddish brown?

Maybe I don't get your question.
 
Maybe I don't get your question.

Obviously not since I didn't have one.

I just thought that some might be interested.

I can certainly see some features of hydraulics theory in play can you?

The most obvious is that the side stream flow has essentially ceased.
 
Studiot said:
Obviously not since I didn't have one.

I just thought that some might be interested.

Ah! Ok. My bad. Sorry.

The most obvious is that the side stream flow has essentially ceased.

No I don't think that's true. I think it is still flowing. The interface makes you think it isn't.
 
It is difficult to impossible to show true (as opposed to arty) movement in a still photo.

I can assure you that the water in the side stream was essentially still. Normally its level would not be that high and it would run out quite quickly into the river.
 
Studiot said:
It is difficult to impossible to show true (as opposed to arty) movement in a still photo.

I can assure you that the water in the side stream was essentially still. Normally its level would not be that high and it would run out quite quickly into the river.

The main stream was flowing very fast?
 
The main stream was flowing very fast?

That's what I said. The nearby river gauging station was running above the weir.

the local river in spate

Perhaps this English term is new to you?

Here are some typical flood pictures from November.

 
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