When the Northeast is icy and snowy.

The Hetao Plain also begins to enter the winter. In the Wula Mountains in the east of the Hetao Plain, this is the end zone of the Hetao Plain of the Yellow River.

At this time, Fang Heng, who was in charge of the work in the area, knew that the autumn and winter floods on the Yellow River were coming, looking at the temperature data and the situation of floating ice on the river that were fed back from the upstream.

"Notify everyone to start blocking the river according to the previous plan."

"clear."

The shrill bells, the methodical militia, the engineers, quickly acted according to the plan.

On the north slope, huge iron cages were filled with stones and sandbags, and steam bulldozers pushed the iron cages down the slope.

Iron cages slide down the river on the slope.

thump! The iron cage is a cube with a side length of 2 meters. It fell into the river and was not submerged, and a small part of it was exposed to the river.

At this time, the runoff in the upper reaches of the Yellow River is about 40 billion to 60 billion cubic meters, accounting for about 50% of the annual runoff of the entire river.

However, the Yellow River's water is concentrated in summer, and its runoff in winter is less than one-tenth.

In winter, the water depth of the river is only about 1.5 meters, which is also the reason for choosing to block the river in winter, because there is not much water in the river at this time.

As the iron cages piled up in the river, the river surface with a width of 762 meters was quickly blocked by three iron cage obstacles.

Of course, due to the gaps between the iron cages, water can still pass through them.

It's just that the militiamen and sappers who were already ready, pushed the carts and poured bags of sand into the river, and the area where the sand bags were poured was the area between the three iron cages.

On the first iron cage target, Fang Heng had already seen that the river water was slowly rising, but after the water surface calmed down, a thin layer of ice began to appear.

He made a quick decision: "Start building an ice dam."

The dry ice factory has been producing at full capacity for several days, and has already reserved more than 200 tons of dry ice. These dry ices were thrown into the river, and before the first iron cage dam, the river surface was frozen for several tens of meters, and the river was connected. The bottom is frozen.

"Continue to pump water to make ice."

Steam pumps pump water from the upstream river, which is then poured onto the ice, along with a steady stream of dry ice.

In less than five hours, an ice dam with a height of 15 meters, a width of 100 meters and a length of 800 meters appeared before the first iron cage dam, and the Yellow River was blocked.

But Fang Heng did not stop, because the ice dam is not safe and must continue to expand.

However, the next ice dam will protrude upstream from the center of the river to form an arch dam shape, which will transmit the pressure of the ice dam to the mountains on both sides.

The iron cage dam and sandbag dam behind the ice dam will continue to be built and strengthened. It is planned to form a dam with a length of 1,200 meters, a width of 200 meters and a height of 25 meters.

Of course, whether it is an ice dam or an earth dam, it is something that is temporarily used for a few years.

The main purpose is to raise the water level of the Hetao section of the Yellow River by about 5 meters. As long as the water level reaches 5 meters, the dam of the North Entry Canal can be excavated to guide the Yellow River to scour the North Entry Canal.

Ice dams are the most cost-effective option.

After all, once the North Entrance Canal is washed out, the pressure of the dam at the mouth of the Wulashan River will naturally drop.

For a week in a row, the thickness, height, and width of the ice dam have been increasing rapidly.

The Yellow River in the Hetao area is also rising rapidly. At this time, the water level has exceeded 3.7 meters, submerging large areas of low-lying areas along the coast.

At the location of Wuliangsuhai in later generations, the river quickly surged in, and the lake was built more than a thousand years in advance.

New Year 5, December 16th.

The temperature in the Loop dropped to minus 12 degrees Celsius, which greatly enhanced the construction and maintenance of the ice dam.

After more than half a month of water storage, the water level of the Yellow River in the east of the Hetao Plain has risen to 8.3 meters.

In the vicinity of the Beijin Canal, the water level of the Yellow River has also risen to 5.5 meters.

Gu Qiuxin, who had been staring at him for a long time, knew that he couldn't wait any longer: "Dig the dam."

boom! The dam was blown open with a small opening by blasting explosives.

Suddenly, the surging water of the Yellow River, like a galloping horse, squeezed through the gap, and the dam body was quickly washed away.

The ice-cold water flows northward in the long and loose channel.

The North Entrance Canal has a total length of 176 kilometers and an average width of only 5 meters, which greatly improves the speed of water flow.

In less than 15 hours, the river water rushed into the Hanhai Lowland. The average altitude of the Hanhai Lowland is only 800-1000 meters, while the altitude of the Hetao Plain is 900-1200 meters.

At the intersection of the Beijin Canal and the Yellow River, the altitude is about 1100 meters.

As a result, the two sides formed a drop of at least 100 meters.

The north entry channel, which was originally matched with the rock and soil layers, accelerated the erosion of the sides and bottom of the channel under the influence of the acceleration of gravity, and continuously widened and deepened the north entry channel.

Over time, the Yellow River in the Hetao area did not drop much, but it did not continue to rise.

Obviously, the river water flowing into the upper reaches was digested by the North Entrance Canal.

However, this is only the flow in winter. It is necessary to know that the flow of the upper Yellow River in winter is about 5 to 9 billion cubic meters, and summer is the real bulk.

The steady stream of river water kept rushing into the Hanhai lowland, and soon formed a series of lakes in the low-lying place.

at the same time.

In the downstream after the ice dam blocked the river, there were not many river channels in winter, and the river water became more scarce, and some of the river channels even stopped flowing directly.

In the vicinity of the ancient Jiuyuan ruins (now Baotou) on the west side of the Yunzhong Plain (Tumochuan Plain), the construction of the Yunzhong Dam began according to the terrain.

Since the water has been blocked upstream, only ice remains in the river here.

18,000 workers who were previously arranged to support the Beijin Canal project were transferred here to start the construction of the Yunzhong Dam.

However, the Yunzhong Dam is not high, with a height of only about 80 meters. It adopts the design of gravity dam, and the designed water storage height is only 45 meters high.

This is mainly due to the engineering volume and safety. Tang Feilin did not have much consideration for the shipping value of the middle reaches of the Yellow River.

In fact, when the stepped reservoir in the middle reaches of the Yellow River is completed, the shipping value here will be redeveloped. It is a big deal to build more transfer stations and transport them by ship relay.

As for the ship lock elevator plan, this is something that will be considered in the future, and it is not necessary now.

In recent years, no water from the upper reaches of the middle reaches of the Yellow River has entered.

The Yellow River passes through the North Entry Canal, continuously sending the river water into the lowland of the Hanhai Sea, and at the same time there is a large amount of sediment. These sediments are not in the upstream river itself, but in the loose soil layer of the North Entry Canal.

Even if the river does not want to erode the river bank, Gu Qiuxin will artificially accelerate it, such as burying explosives in some river banks to loosen the soil on the river banks.

Before I knew it, more than four months had passed.

At this time, the North Entrance Canal, the river channel was extended to about 80-120 meters, and the depth was about 6.7-89 meters.

In the Hanhai lowland, more than 1.8 billion tons of sediment were washed over to form a large alluvial plain, and there were also up to 4.1 billion cubic meters of river water.

But it's not over yet.

Because the upper reaches of the Yellow River have begun to thaw, the winter and spring floods are coming.

At that time, there will be billions of cubic meters of river water, but the sediment will be reduced a lot, because the river will not erode unrestrictedly, especially as the river becomes wider, the flow of the river will slow down, which will lead to the weakening of the erosion effect of the flowing water.

However, during the winter and spring flood season, it will not weaken too much.

As the North Entrance Canal continues to widen, the water level of the Hetao Plain is also gradually decreasing, but with the arrival of the flood season in summer, the water level will not drop too much.

Fortunately, the earth dam behind the ice dam has been completed at this time, and there is no need to worry about the Yellow River water rushing downstream after the ice dam melts.

At that time, tens of billions of cubic meters of river water will form a new river in the lowland of the Hanhai Sea.

In other words, rivers are already forming.

In the west of the Hanhai Lowland, a river rushes through the Gobi Desert, sandy land, and grassland.

The three airships flew westwards quickly along the river, and finally came to the end - Juyan Sea.

Juyanhai is the lowest position in the Hanhai lowland, and it is also the lake that the Ruoshui River in the Hexi Corridor injects into. At this time, the river course of the Yellow River is actually connected with Juyanhai and Ruoshui.

Although less than 500 million cubic meters of river water flows to Juyan Sea, the Juyan Sea at this time covers an area of ​​about 80 square kilometers and has a water storage capacity of 0.8 to 170 million meters.

The river water instantly more than tripled the size of the lake.

In addition to the river water flowing westward and entering the Hanhai lowland, there is also a small part of the river flowing to the northeast, but it did not flow to the Hulunbuir prairie, mainly because the water volume was not enough.

But when the flood season comes in summer, UU reading www.uukanshu.com can think about it.

However, in order to extend the Yellow River to the northeast of the Hanhai Lowland, there is definitely no way to rely on natural flow. It must also rely on artificial guidance and the use of active rivers in the eastern part of the Hanhai Lowland.

But the existence of this canal is very important.

Because this means that a large steamship can go down the river from Lingwu Mansion in the Yinchuan Plain, pass through the Hetao Plain, and then enter the Hanhai Lowland, so that it can reach Juyanhai in the west and Hulunbuir Prairie in the east.

－－－－－－off topic－－－－－

Thank you for your support ('??w??')

https://

Genius remembers the address of this site in one second: . Lewen Novel Network mobile version reading website: