sand bars
the bank of a river
The material deposited by a river is called sediment. The bits of organic debris such as leaves and stems is detritus. Sediment includes detritus, inorganic material such as pebbles, sand, clay and other rock bits.
That would be refraction.
bends
Warp or warps.
I would call it a sediment.
they get the bends
The abrasion and attrition combined with hydraulic action on the river bed and the river banks erode away the underlying rock which results in small grains of rock we call sand. Depending on the speed of the river and the size of the particles, the sand will be deposited by the river at different stages (usually though it is found near the mouth of the river).
Articulated... or broken depending on the model.
Brazilians call amazon river :river sea
its called a fold (or flult)
till