A gentle beach: what coast is called flat?
The study of rivers is engaged in potamology (from ποταμός- the river). Today, scientists find it difficult to answer the question of how many entire rivers exist on the planet, but this number is unimaginably large. In Russia alone there are at least 2 million of them. It is not surprising that among this number there are rivers with many different characters.
But for most of the reservoirs, somecommon signs. For example, you can often notice that one shore is flat, and the other is steeper. Surely you've been paying attention to this. What is the reason for this?
Our article will tell you about the steep and gentle banks of the river, and also about why it happens.
First, let's look at the terminology. The flat beach, according to most reference books, has a slope of not more than 40 degrees. The bottom in this place, as a rule, does not have breakages, deepens gradually.
The Coriolis force
Scientists have long calculated that most of the rivers in theThe northern hemisphere has left gently sloping banks, and the right ones are steep and steep. In the south everything is the opposite. This is due to the rotation of the planet. Huge masses of water under the influence of their own weight and rotation bite into one shore, while the other has much less impact.
Of course, you can not call this observation an immutable law. There are many exceptions. But the phenomenon is quite common.
Much depends on the flow path of the river itself. On the bends, water cuts into the beach under the influence of centrifugal forces, forming a relief. Moreover, the stronger the slope of the surface, the more this action will be noticeable. Rapid mountain rivers, making their way through stony ground or rocky bottom, so strongly affect the surface that their both banks can be steep and steep. But the rivers, calmly flowing along the plains, often have gently sloping banks on both sides.
So, we found out the difference between the steep and steep bank of the river and how it is conditioned.