Should the harbor be built on the concave or convex bank of the river?

Of course, it was built on a hollow bank.

Because of the deflection force of land reclaim, there will always be some deflection in the direction of the river when it flows, resulting in the strengthening of the scouring effect on one side of the river, while the other side is continuously silted up by sediment, and finally forms land. The concave bank is formed by the erosion of the river, and the convex bank is formed by the continuous siltation of river sediment.

From the above, there are two advantages to building the harbor on the recess:

The recessed bank is generally deep in the river, which is conducive to the navigation of ships.

Due to the stronger erosion effect of the river, the river flow rate is faster, the sediment is not easy to silt, and the river channel will not be blocked, so there is no need to dredge the river channel often.

On the other hand, if the harbor is built on a convex bank, the water flow is slow, the depth of the river is very shallow, and the ship is prone to danger, and the river silts up quickly, so the river must be cleaned frequently.

The river is very erosive, and in order to widen its surface and flow more smoothly, it will continue to erode like two banks. However, if the rocks on both sides of the river are of different degrees of hardness and softness in the place where it flows, then on the harder side, the river erosion does not move, and it will be blocked and turned, thus forming a "meander."

After the formation of the river meander, the river continues to carry sediment to flow, but due to the constraints of the river channel on the river, the main impulse of the river at the turning point is to rush to the concave bank, the speed is large, the sediment will not be deposited, and at the same time, due to the transverse circulation makes the scouring more serious, so the riverbed of the concave bank is also eroded deeply.

On the contrary, the convex bank has a small flow velocity, which makes it easy for sediment to be deposited, so the riverbed is relatively shallow. Therefore, when people build wharves, they will never choose a convex bank with a shallow riverbed to moor ships, resulting in a situation where ships run aground, but will choose a deep concave bank in the riverbed to allow large ships to sail, which is the reason.

First, the reference is different.

1. Convex bank: refers to the protruding part of the bank of the curved riverbed, which is bent due to the influence of local riverbed topography and other factors.

2. Concave bank: the bank of the recessed side of the curved river section.

Second, the reasons for the formation are different.

1. Convex bank: centrifugal force in the water slide Zheng Flow.

Under the action, the recessed river bank enters the bucket to allow the operation to erod, and the eroded sediment is transported to the opposite bank through the bend and circulation, and gradually grows into an arc-shaped convex bank with a gentle slope. The slope is gentle, and the nearshore water flow is gentle.

2. Concave bank: As a result of the interaction between the water flow and the riverbed, the total empty beam of the natural river is curved and curved, forming a series of bays. Due to circulation, one bank is scoured, so that the shoreline is concave; The other bank is silted, making the shoreline protrude.

Therefore, the concave shore water is deeper, which is the position of deep Hong; The convex shore is shallow, forming a side beach.

The distinction between concave and convex banks of rivers is mainly to investigate the problem of geostrophic deflection.

In the Northern Hemisphere, the geostrophic deflection force is biased to the right, so the erosion of the right bank of the river will be more serious in the Northern Hemisphere, and a concave bank will be formed. On the left bank, the socks are piled up to form a convex bank.

The geostrophic deflection force of the southern hemisphere is to the left, so the erosion of the left bank of the river will be more serious in the southern hemisphere, and the concave bank will be formed; The right bank is constantly piled up to form a convex bank.

Trouble point in the upper right corner [satisfied] state good stool to encourage,

The river water generally flows downstream, and in the process of the development of the Sakura River Valley, it has changed from a straight river to a winding river, mainly because of "concave bank erosion and convex bank accumulation". As soon as the river flows, it is affected by geostrophic deflection forces and deflects (left in the northern hemisphere and right in the southern hemisphere). When the river is deflected, it erodes the bank, causing it to slowly sink into a concave bank.

At the same time, the river flow rate is slower, and sedimentation occurs and becomes a convex bank. The concave bank flow rate is fast and the convex flow rate is slow. In the event of heavy rain, the bank is more likely to overflow when the rainstorm is full, and overflow when the water is full.

Either way! The convex bank water level is deep, and there is no need to dig the riverbed low, but it is not conducive to sheltering from wind and waves. It's the opposite!

Because the water is deeper there.

1. The convex bank is easy to be deposited, and the concave bank is easy to be eroded by flowing water.

2. Due to the deposition of flowing water, the convex bank sinks down the mud and raises the riverbed, and the ship is easy to run aground.

The convex bank is a piled bank, the water is shallow, and the sediment accumulation is serious.

First of all, the flow direction of the river varies, and the location of the concave bank and convex bank cannot be defined by the east bank, west bank, south bank, and north bank.

Secondly, the location of the concave bank and the convex bank cannot be defined by the left bank and the right bank. In fact, any shore of Lingqin may become a concave or convex bank.

Third, it is important to understand that the formation of the depression is due to erosion, so the shape of the depression is similar to that of a bay that sinks into the land.

In the same way, the convex shore land appears because of the phenomenon of accumulation, and its shape resembles that of a peninsula jutting out into the sea.

Fourth, which shore is eroded is conditioned by a variety of reasons.

From the perspective of geostrophic deflection forces, the right bank of rivers in the northern hemisphere is susceptible to erosion and becomes a concave bank, while in the southern hemisphere, the left bank of the river is susceptible to erosion and becomes a concave bank.

If the original valley has the form of concave bank and convex bank due to the initial topographic undulation and trend, then no matter which hemisphere the river is located in, the river will wash the concave bank because of the habit of moving forward, so that the river meanders out and bends more.

The section of the Jingjiang River on the Yangtze River in China is called the Jiuqu Ileum, and there are concave banks on the left and right banks of the river, which is due to the increase in the curvature of the river and the slowing down of the flow rate, and the geostrophic deflection force will not play any role.

Definition of concave and convex bank:

Conve

bank), refers to the protruding part of the bank of the curved riverbed, which is bent due to the influence of local riverbed topography and other factors. Similarly, the recess that goes into the curved riverbed is called a concave bank.

In the picture on the left that you provided, A is the concave shore and B is the concave shore. Convex bank.

Note: No problem at all!!

You understand it this way, people are standing on land, and if you look straight at it, one less piece is a concave bank, and one more piece is a convex bank.

It can also be remembered in this way, the concave bank erodes and the convex bank accumulates, and the concave bank becomes less and less, and the convex bank becomes more and more.