A banked curve.
A curve in a stream channel is called a meander. Meanders are caused by the flow of water eroding the outside of a bend and depositing sediment on the inside, leading to a winding pattern in the channel. Meanders are a natural feature of rivers and streams and play a vital role in shaping the landscape.
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The outside of a meandering stream erodes more than the inside bends due to the faster flow of water on the outside of the curve. The higher velocity of water on the outside causes more erosion through processes like hydraulic action and abrasion, wearing away the bank more quickly. Additionally, the outside bends experience more turbulence, leading to increased erosion compared to the inside bends.
Sediment erodes on the outside curve of a stream due to increased water velocity and greater force exerted by the water against the bank. This causes the bank to be undercut and eroded, leading to sediment loss. Additionally, the water flow on the outside curve creates a helical flow pattern that increases erosion on that side.
A river's current slow down and tend to meander across a flat valley floor. The river's current is faster on the outside of the bend, and slower on the inside.
stream channel
It's all about fluid dynamics. The water in a river acts like a single substance. It has the tendency to stay together. One part of the fluid is not easily pulled apart from the rest. So when the water comes to a curve, the whole "bunch" of water wants to stay together and travel downhill at the same time. However, the water at the outside of the curve has to travel faster to keep up with the water on the inside of the curve because it must cover more distance in the same amount of time. The same fluid principles also apply to air and account for the lift that occurs when air travels over an airplane wing.
A curve in a mature or old age river is called a meander and forms when the slightest curve forms and starts to grow larger. This is because on the inside of a curve water moves slower and deposits sediment, and on the outside the exact opposite happpens when faster moving water pounds against the curve making it bigger. In an old age stream when the meanders get big enough the section of river that's curved can actually be cut-off during a flood because water always wants to take the quicker path. The lake that forms when this happens is called and ox-bow lake. It is called this beacue the ox-bow was put on oxen and used to plow fields around the time this kind of lake was named and they had simmilar shapes.
A meander is a curve or bend in a stream or river.
The PPF graph is a bowed out curve. The x-axis being quantity produced of one product/service and the y-axis being another quantity produced of a product/service. Any point on the curve is productive efficiency. Outside of the curve is unattainable and inside of the curve is inefficient.
The current is faster on the outside of a bend than on the inside. The outside bank will erode and the inside will fill in. Also depends on the rock make up. In this way, in a uniform soil/rock, a river will follow a sine-type curve along its flatland basin etched out over millions of years and the sine curve will advance down the current flow line.