I am not saying rivers are an unimportant source of sand. I am saying they may not be a major source of sand. |
It is like having molasses move through the water. Something heavy sinks and moves along the bottom. |
Most of the time, there is no water coming out of the San Luis Rey. But when it 'goes,' it goes big. If sand is coming from the river, it has to be coming in huge pulses. |