The study looked at how the shape of a stream and the way water flows affect how sediment moves in steep, rocky streams. They found that in these streams, the water flow changes a lot during floods, making it hard to predict how sediment will move. The researchers used special particles to track how sediment moves in these streams and found that sediment doesn't travel as far in steep streams compared to flat ones. The size of the rocks in the stream bed also affects how sediment moves during floods. Overall, the study shows that sediment movement in steep, rocky streams is different from what we see in gentler rivers.