A point bar is a depositional feature made of sand and gravel that accumulates on the inside bend of streams and rivers below the slip-off slope. Point bars are found in abundance in mature or meandering streams. They are crescent-shaped and located on the inside of a stream bend, being very similar to, though often smaller than, towheads, or river islands.
Point bars are composed of sediment that is well sorted and typically reflects the overall capacity of the stream. They also have a very gentle slope and an elevation very close to water level. Since they are low-lying, they are often overtaken by floods and can accumulate driftwood and other debris during times of high water levels. Due to their near flat topography and the fact that the water speed is slow in the shallows of the point bar they are popular rest stops for boaters and rafters. However, camping on a point bar can be dangerous as a flash flood that raises the stream level by as little as a few inches (centimetres) can overwhelm a campsite in moments.
A point bar is an area of deposition whereas a cut bank is an area of erosion.
Point bars are formed as the secondary flow of the stream sweeps and rolls sand, gravel and small stones laterally across the floor of the stream and up the shallow sloping floor of the point bar.
Read more about Point Bar: Formation, Fallacy Regarding Formation of Point Bars, See Also, References
Famous quotes containing the words point and/or bar:
“What’s the point of fighting the dollars
when all you need is a warm bed?
When the dog barks you let him in.
All we need is someone to let us in.
And one other thing:
to consider the lilies in the field.”
—Anne Sexton (1928–1974)
“Hemingway is terribly limited. His technique is good for short stories, for people who meet once in a bar very late at night, but do not enter into relations. But not for the novel.”
—W.H. (Wystan Hugh)