Fluviatiles sediment

Typisches Sediment, hier Kies
typical sediment, here gravel

as fluviatile or fluviale („of rivers caused “, lat. fluvius: River) of sediments one designates carried rock cut up by a running waters in the geosciences.

Fluvial of transported sediments are usually well rounded and can cover nearly all rocks, which occur in the catchment area of the respective river or river. They possess grain size, which - depending upon situation in the under or upper run of waters - reach from fine sand to rubble (0.1 mm to approximately 20 cm).

variants

with fluvial transported sediments one differentiates between solution , suspended matter and solid freight.

Solution freight is the portion of the complete freight in the water solved is transported. The solid freight is solved not in the water and becomes either jumping (saltierend) or roll-pushing transports. Suspended matters are free by their weight in the water gauge floating.

Original edges are sanded off by transport. Quantity of water and speed determine the size of the freight in a running waters section. A measure for this is the transportation capacity of running waters. If the transportation capacity decreases with continuous sediment discharge, the material stores itself off (sedimentation).

Whether in a running waters section erosion (clears from material) or sedimentation (deposit) prevails, becomes with the load relationship ausgedrückt. Dabei bezeichnen Zahlen > 1 sedimentation, < 1 erosion, and 1 the equilibrium.

Erosion steps z. B. with the formation of river valleys in hilly and/or. hilly area up. During the since waiting misalignment of mäandrierenden rivers it comes with the percussion slope to the erosion (scour formation or scouring) and with the Gleithang to the deposit.

effects

fluviale transport can to important deposits of sediments lead, itself the z. B. lead important gravel pits in river terraces, upper or underground crushed stone banks or as raw material.

At most and furthest rocks are transported in precipitation-rich times, particularly in ice ages and with inundations. In the ice ages fluviale transport led to the education of many river terraces, which coin/shape far landscapes - for instance in the Danube countries, in the catchment area Rhine or in Poland and Russia. Inundations can lead also today still to the misalignment of river courses, if a flood prominent river its Geschiebe deposits the way in a flat Mäander and itself so blocked.

see also

Hjulström diagram, washing, gravel, crushed stone, clay/tone, river delta, formation, stores, Schottergrube

 

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