Deposition will occur to cut off the original meander, leaving a horseshoe-shaped oxbow lake. When there is a very high discharge (usually during a flood), the river cuts across the neck, taking a new, straighter and shorter route. Erosion narrows the neck of the land within the meander and as the process continues, the meanders move closer together. The build-up of deposited sediment is known as a slip-off slope (or sometimes river beach).ĭue to erosion on the outside of a bend and deposition on the inside, the shape of a meander will change over a period of time.Water on the inner bend is slower, causing the water to slow down and deposit the eroded material, creating a gentle slope of sand and shingle.The lateral erosion on the outside bend causes undercutting of the bank to form a river cliff.This causes increased speed and therefore increased erosion (through hydraulic action and abrasion ). As a river goes around a bend, most of the water is pushed towards the outside.When the river flows over flatter land they develop large bends called meanders. The meandering Kuroshio leaves a clear signature in winter. A well-developed large meander is found off the south coast of Japan, with a strong cyclonic eddy southeast of Kii Peninsula (centered at 32.5°N, 137☎), and an anticyclonic eddy to its southwest. i The device comes in a variety of forms. Figure 1a shows mean SST and SSH in the winter DecemberFebruary (DJF) of 2004/05. Lateral erosion starts to widen the river. The terms Greek key, fret, and meander are all names for a decorative device employed on buildings and objects beginning in ancient Greece and continuing to modern times. Erosional and depositional landforms MeandersĪs the river makes its way to the middle course, it gains more water and therefore more energy.
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