Fluid Dynamics

Di-hydrogen oxide (water) is a weird thing. With all the water in Ecuador, there are obviously a lot of rivers and streams. Due to their rapid elevation loss over a short period of time, most of the rivers take on a very muddy appearance until they are much farther downstream, almost to the Peruvian border some 100-120 miles away. I have noticed while flying over the plethora of waterways in the jungle the interesting way some of the streams and rivers merge. While I cannot explain all the details about their merging, two bodies of water carrying different sediments etc, alters their density, thus their ability to mix easily. Therefore in the picture below two rivers basically comprised of the same elements are "repelling" each other until much farther downstream where they mix and become the same color.