This is super cool. That river is so beautiful at night. In my photography class we talked both about how water looks under different shutter speeds AND combining multiple exposures into a single shot.

The fast shutter gives a crystal clear representation while the longer shutter speed really smoothes things out. It's seems obvious once you think about it, but it's really cool to see a side by side of the difference

HDR, or High-Dynamic-Range photos combine the same picture with multiple exposures to make a single photo with impressive range. Just like bracketing you'll try out different exposures, but then you can squish them all together into a single HDR image to kind of cherry pick the best parts of each photo. Of course this requires heavy computation, and limited to digital photography (to my knowledge).