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Alluvial fan
Alluvial fan arise when a body of water carries a lot of water and debris and flows from steep to flat terrain. In flatter terrain the water flows less quickly than in steeper sections. The water and debris flowing in is dammed up, overflows the banks and - if the terrain permits - spreads out in a fan shape.
View from above to the alluvial fan in Gamchi (Kiental).
Photo from 29.9.2018.
Alluvial fan in the Gamchi prevents worse at high water: The Gamchibach, which carries a lot of water and debris in this situation, meets the much flatter terrain in the Gamchi at the end of the rather steep gorge. The Gamchibach is lightly dammed, overflows its banks and deposits large parts of the debris it carries in a clearly visible fan. Most of the bed load deposited in the Gamchi is scree and debris from the Gamchi glacier, which is located a little higher up.
The alluvial fan in the Gamchi is bounded (in the photo) by an alluvial cone in the upper left.
The photo shows a second alluvial fan on the right, which flows into the large alluvial fan of the Gamchibach. On this smaller alluvial fan the vegetation could already gain a foothold again.
This is because the last flooding was longer ago and/or the deposited debris is finer and/or because humus was also washed up.
Published:
01.03.2020
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