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A point bar is an area of deposition where as 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.
A point bar is an area of deposition typically found in meandering rivers. Point bars form on the inside of meander bends in meandering rivers. As the flow moves around the inside of the bend in the river, the water slows down because of the shallow flow and low shear stresses there reduce the amount of material that can be carried there.
The terms river morphology and its synonym stream morphology are used to describe the shapes of river channels and how they change in shape and direction over time. The morphology of a river channel is a function of a number of processes and environmental conditions, including the composition and erodibility of the bed and banks (e.g., sand, clay, bedrock); erosion comes from the power and ...
The processes of point bar deposition and bank erosion are intertwined and in most cases the erosion rate of cut banks is equal to the deposition rate of point bars. [3] In addition, point bars act as topographic obstructions once formed that further drive flow into the opposite bank, creating a positive feedback loop. This leads to the ...
Cut bank erosion and point bar deposition as seen on the Powder River in Montana. Cut banks along the Cut Bank Creek. A cut bank, also known as a river cliff or river-cut cliff, is the outside bank of a curve in a water channel (), which is continually undergoing erosion. [1]
Point bar – Landform related to streams and rivers; Polje – Type of large plain found in karst regions; Pond – Relatively small body of standing water; Pothole – Natural bowl-shaped hollow carved into a streambed; Potrero – Long mesa that at one end slopes upward to higher terrain; Proglacial lake – Lake formed by the action of ice
The slip-off slope of an entrenched meander is a gently sloping bedrock surface that rises from the inside, concave bank of an asymmetrically entrenched river. A thin, discontinuous layer of alluvium often covers this gently sloping bedrock surface.
The point bar is built up to a level very close to that of the river banks. Significant net erosion of sediments occurs only when the meander cuts into higher ground. The overall effect is that, as the river meanders, it creates a level flood plain composed mostly of point bar deposits.