Chapter 618: Water From the Yellow River Comes From the Sky

When the Northeast is icy and snowy.

The Hetao Plain has also begun to enter winter. In the Wula Mountains in the east of the Hetao Plain, this is the plain converging area of ​​the Hetao section of the Yellow River.

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

"Notify everyone, according to the previous plan, start to block the river."

"clear."

With the sharp ringing of bells, the orderly militiamen and engineers quickly acted according to the plan.

On the north slope, there are huge iron cages filled with stones and sandbags, and the steam bulldozers push the iron cages down the slope.

The iron cage slid down the slope and down the river.

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

At this time, the runoff of 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 whole river.

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

The water depth of the river in winter 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 the militiamen and engineers who have already prepared,

Pushing a trolley, pour bags of sand into the river, and the area where the sand bags are poured is the area between the three iron cage dams.

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

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

The dry ice factory has been working at full capacity for several days, and has already stockpiled more than 200 tons of dry ice. The dry ice was thrown into the river, and immediately before the first iron cage dam, it froze the river surface tens of meters long, and even the river The bottom is frozen.

"Continue pumping water to make ice."

The steam pump pumps the water from the upstream river, and then pours the water on the ice, plus the continuous input 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, blocking the Yellow River.

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

However, the next ice dam body will protrude upstream from the center of the river channel, forming an arch dam shape, and transmitting 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 reinforced. 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, they are all 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 inlet channel can be excavated to guide the Yellow River to scour the north inlet channel.

Ice dams are the most cost-effective solution.

After all, once the North Access Canal is flushed, the pressure on 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 water level of the Yellow River in the Hetao area is also rising rapidly. At this time, the water level has broken through to 3.7 meters, flooding a large area of ​​low-lying areas along the coast.

At the location of Wuliangsuhai Lake in later generations, the river rushed in rapidly, and this lake was created more than a thousand years in advance.

New calendar 5 years, December 16th.

The temperature in Hetao dropped to minus 12 degrees Celsius, which greatly strengthened the construction and maintenance of ice dams.

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.

Near the Beijin Canal, the water level of the Yellow River also rose to 5.5 meters.

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

boom! The dam was blown open by blasting explosives.

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

The icy water flowed all the way north in the narrow and loose channel.

The total length of the North Access Canal is 176 kilometers, and the average width is only 5 meters, which greatly improves the flow rate of the water.

In less than 15 hours, the river rushed into the Hanhai lowlands. The average altitude of the Hanhai lowlands is only 800-1,000 meters, while the altitude of the Hetao Plain is 900-1,200 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.

Under the influence of the acceleration of gravity, 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, continuously widening and deepening the north entry channel.

As time went by, the water of the Yellow River in the Hetao area did not drop much, but it did not continue to rise either.

Apparently, the river water flowing from the upper reaches was digested by the north inlet canal.

But this is only the flow in winter. You must know that the flow in the upper reaches of the Yellow River in winter is only about 5 to 9 billion cubic meters, and summer is the real bulk.

A steady stream of river water kept rushing into the lowlands of the vast sea, and soon formed a series of lakes in the low-lying places.

at the same time.

Downstream after the ice dam blocked the river, there was not much river water in winter, and the river water became even scarcer, and some rivers even stopped flowing directly.

Near the ancient Jiuyuan ruins (today's Baotou) on the west side of the Yunzhong Plain (Tumochuan Plain), the Yunzhong Dam began to be built according to the terrain.

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

18,000 laborers who were previously assigned to support the North Jinqu project were transferred here to start the construction of the Yunzhong Dam.

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

This was mainly due to the amount of engineering and safety, Tang Feilin didn't have to think too much about 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. At worst, more transfer stations will be built and transported by ship relay.

As for the plan of the lock elevator, 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 continuously sends water into the lowlands of the vast sea through the North Entry Canal. At the same time, there is a large amount of silt. The silt is not from the upstream river itself, but 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 planting explosives on some river banks to loosen the soil on the river bank.

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

At this time, when entering the canal in the north, the river channel was expanded to about 80-120 meters, and the depth was about 6.7-89 meters.

In the lowlands of the Hanhai Sea, more than 1.8 billion tons of sediment were washed over, forming a large alluvial plain, and there were also 4.1 billion cubic meters of river water.

But that's not all.

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

At that time, there will be billions of cubic river water, but the sediment will decrease a lot, because the river channel will not erode indefinitely, especially as the river channel becomes wider, the flow speed of the river will slow down, which will lead to the weakening of the erosion effect of running water.

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

As the north access channel continues to widen, the water level of the Hetao Plain is also gradually decreasing, but with the arrival of the summer flood period, the water level will still not drop too much.

Fortunately, the earth dam behind the ice dam has been completed at this time, so there is no need to worry about the water of the Yellow River 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 lowlands 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 west quickly along the river, and finally came to the end - Juyanhai.

Juyanhai is the lowest point of the Hanhai lowlands, and it is also a lake fed by the Ruoshui River in the Hexi Corridor. At this time, the channel of the Yellow River is actually connected with Juyanhai and Ruoshui.

Although there is less than 500 million cubic meters of river water flowing to Juyanhai, the area of ​​Juyanhai at this time is only about 80 square kilometers, and the water storage capacity is about 80 to 170 million meters.

The river instantly doubled the size of the lake.

In addition to flowing westward, a small part of the river water entering the Hanhai lowland flows northeastward, but it does not flow to the Hulunbuir Prairie, mainly because the water volume is not enough.

But when the summer flood season comes, it can be considered.

However, in order for the Yellow River to extend to the northeast of the Hanhai lowland, there is definitely no way to rely on natural flow, but to 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 large steamships can go down the river from Lingwu Mansion in the Yinchuan Plain, pass through the Hetao Plain, and then enter the lowlands of the Hanhai Sea, so that they can reach Juyan Sea in the west and Hulun Buir Grassland in the east.

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