Why are rivers crooked and why are rivers crooked?

The deflection force of the river continuously erodes one side of the river, which in turn causes siltation on the other side.

When the earth rotates, there will be a rotational deflection force, causing the rivers in the northern hemisphere to deflect to the right and the southern hemisphere to the left, so they are curved.

The geostrophic deflection force erodes one side of the riverbank, followed by siltation on the other side.

Rivers in the Northern Hemisphere are biased to the right, and those in the Southern Hemisphere are to the left.

Why are rivers crooked? Because the river is dynamic, not only the river is dynamic, but the objects in the river are also dynamic and affected by the geostrophic deflection force, one side of the river will be subjected to heavier forces.

I don't know if you've noticed that almost all the rivers in the world flow in a crooked direction, and why?

This is because the concave surface of the river's bank is eroded by water pressure.

Suppose the river was originally straight, and at some point there was a bend in one section for accidental reasons. Considering the flow of the cross-section, on the one hand, because the river water has to bend under the constraints of the riverbank, the pressure of the river water acting on the bank will increase, and this pressure is proportional to the curvature of the riverbank, that is, the more bending, the greater the pressure, and it is also proportional to the square of the flow velocity, that is, the greater the flow velocity, the greater the pressure.

This means that the concave surface of the river's bank will be eroded by this water pressure. Now the flow of river water along the river channel is regarded as a primary flow, because the river channel is curved, so from a local point of view, it can be regarded as a primary flow that rotates along a circular arc, and also produces a secondary flow, which will carry the sediment to the center of the river bend, that is, the protruding bank of the river channel.

The end result is that the convex surface of the river bank becomes more and more convex, and the concave surface of the river bank becomes more and more concave, and the bend of the river becomes more and more curved.

First of all, this phenomenon is related to the geostrophic deflection force. Geostrophic deflection force refers to the force that acts on a moving object due to the rotation of the earth, referred to as deflection force. It only occurs when the object is moving relative to the ground (it does not actually exist), and can only change the direction of the horizontally moving object, not the rate of the object's motion.

Geostrophic deflection forces cause horizontally moving objects to deflect to the right of the direction in which they are going in the northern hemisphere and to the left in the southern hemisphere. Taking rivers in the northern hemisphere as an example, under the influence of geostrophic deflection forces, the river always tends to deviate to the right, so the right bank of the river is always washed, while the left bank is often slower because there is not so much river water rushing towards it, so the flow rate is slower, so there is often sand and gravel accumulation. Over time, even the originally straight river course will begin to bend.

Characteristics of the river.

According to the different regions through which they flow, rivers can generally be divided into mountain rivers and plain rivers. For larger rivers, the upstream section is mostly mountain rivers, the downstream section is mostly plain rivers, and the middle section often has the characteristics of both mountain rivers and plain rivers. For smaller rivers, the entire section may be located in mountainous areas or in plain areas, showing corresponding characteristics.

The planar morphology of the mountain rivers is wide and narrow along the way, and it is in the shape of lotus roots. In the canyon section, the valley cross-section is mostly V-shaped, the valley slope is steep, the shoreline is extremely irregular, there are many sharp bends, bayonets and protruding mouths, and there are often solitary rocks protruding or reefs standing in a forest. In the wide valley section or hilly section, the cross-section of the riverbed is mostly U-shaped, the valley slope is generally gentle, there are developed terraces, and there is a beach in the center of the river; At the confluence of the stream, a large amount of sand and gravel is often accumulated at the mouth of the stream, forming a fan-shaped alluvial body, narrowing the channel and even blocking it.