Physics again

In a small creek, there was an interference pattern set up in the water.  As waves from reflections off different rocks came together, they formed a standing wave pattern. Explanation here.  Also, here's an interesting simulation. (link)  Well, interesting to me...

Interference

Wave interference on Falls Lake.
 You can see the nodal lines (places where a crest and trough come together to destructively interfere) and the antinodes (where the waves come together and add together to make a bigger wave). The wind had just shifted and set up interfering waves.  

Yay physics!