What we're going to do is use that vibrating shaking device that's attached to the top of the barrel there and drive it into the sediment here in order to collect the core. - I have spent many years studying rivers on several continents. - Most rivers around the world are comprised of sand. They have sand on their bed and that sand is moved by water and it forms dunes. - These dunes are not too dissimilar from the types of dunes that we're familiar with, which we may find in desert environments. - When that sand moves along, it has a physical interaction with the flow itself. - We can look at the interactions, these physical interactions, between the sand movement and the water discharge to understand what the flux of sand is. - Flux is simply the volume movement per unit time. - Now traditionally, most sand bed rivers have a very distinctive grain size. - The Yellow River is unique insofar that the grain size on the bed of the Yellow River is much smaller; it's on the order of about 100 microns. - Before our particular study, we weren't sure how to quantify, from a physics perspective, the interaction between flow and the movement of this sediment. - Moreover, we had no assessment or understanding or prediction for what the bed of the river would look like. - It turns out that it's shaped completely differently from what we find in most traditional or coarser sand bed river systems. - The Yellow River sediment flux is about 20 times higher than that standard so-called physical law. - We always wonder why what happened in this system. - It's not until we start our field survey in 2015, using the advanced technology, the three-dimensional radar, to measure the surface bed that we will realize. - Oh, the Yellow River has...
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