Alluvial fans can be tiny, with an apron of just a few centimeters spreading out from the trickle of a drainpipe. An alluvial channel is a water channel made up of loose sediments called alluvium. As a result, it sheds a lot of material, which it had been carrying from the mountains, at the foothills. More than 2,000 alluvial fan areas, or 6% of the total land area, have been mapped in Otago. An alluvial fan is a triangle-shaped deposit of gravel, sand, and even smaller pieces of sediment, such as silt. …
Research group River and delta morphodynamics Alluvial Fans Tjalling de Haas (t.dehaas@uu.nl) How did this boulder get here?
This sediment is called alluvium. They can also be enormous. There are three different types of alluvial fans in the subenvironment designated as proximal or upper fan, mid or middle fan, and distal or lower fan. The narrow point of the alluvial fan is called its apex, while the wide triangle is the fan's apron. The fans' elevated profile, with good drainage, make them attractive places for people to live. Alluvial Fans and Cones When a stream leaves the mountains and comes down to the plains, its velocity decreases due to a lower gradient.
Today General intro on alluvial fans Processes that act on alluvial fans BIG QUESTIONS: Which three (genetic) types of alluvial fans exist? In the proximal fan subenvironment, located just at the exit of the mountain range (upper fan), coarse-grained massive gravel (Gm) and blocks which contain relatively high proportion of fine-grained matrix are highly prevalent.
However, flooding on alluvial fans can be more damaging than other types of flooding because the fans have steeper gradients than river floodplains. Alluvial fans are usually created as flowing water interacts with mountains, hills, or the steep walls of canyons.
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