Yan Peng did not immediately make up his mind, but rummaged through the row of data cabinets behind him.

After searching for a long time, I finally found an old information bag.

He carefully wiped the dust off it, untied the rope, and pulled out a large stack of materials from it.

"This is the first project I have worked on at the Hydraulic Design Institute, and 20 years have passed in a blink of an eye."

Holding these materials is like holding priceless antiques.

"The historical changes of the Mother River in Heijin Province?" Xu Xin couldn't help but read out the name of one of the reports.

"The scope of this project is very broad, if you want to say the mother river of Heijin Province, there must be several, in addition to the Huangjiang River, there are also the Qingjiang River, the Panjiang River, etc.

Due to the problem of project funding, we did not do a very detailed study of each river at that time, but only investigated the source of several major rivers and the historical and civilization development near the rivers. ”

Speaking of this project, Yan Peng had a deep regret on his face.

"Does this project have anything to do with the Yantugou bauxite mine?" Xu Xin was puzzled.

"I can't say."

Yan Peng shook his head, "For hundreds of thousands of years, although the geological activities of the entire Heijin Province have been frequent, there have been few changes in a few major rivers.

Of course, local changes are inevitable.

Judging from the section you showed me, if it is really a riverbed, the rocks piled up on the riverbed are still loose breccia and clay, and they are not very old.

Judging from this, it is believed that one of the major rivers has been diverted due to geological activities. ”

Hearing this, Xu Xin nodded in agreement, and at the same time had doubts in his heart, "Even if the nearby river is diverted, but this riverbed is obviously on the top of the mountain, which is very unreasonable." ”

"What's unreasonable about this, our entire plateau in Heijin Province is still rising every year. As human beings, life is short for decades, and we don't feel it obviously.

But hundreds of thousands of years is enough time. ”

As he spoke, Yan Peng had already spread a few water system diagrams on the table and looked at them carefully.

After looking at it for a while, he spoke: "Within the jurisdiction of Xingfu City, there are two big rivers passing by, one is the Huangjiang River in the north and the other is the Panjiang River in the south. ”

"You mean one of the rivers once passed through here, but it was only diverted because of geological movements?"

"Definitely!"

Yan Peng nodded, and then flipped through a few thick reports.

Xu Xin also picked up a report on the historical changes of the Huangjiang River and held it heavily in his hand, but was this still a report drawn from insufficient funds and not enough detail?

If you have enough money, will you be able to write a library?

Glancing at the title page, the first writer wrote Yan Peng.

I flipped to the general introduction and took a look at it, and I was dizzy.

"Senior, what is your academic background?"

Xu Xin thinks he doesn't have the skills to write such a research report.

It is not a question of whether to work hard or not, but a question of the level of thought.

"The highest degree is a doctorate."

Yan Peng said casually, then put down the report in his hand and beckoned to Xu Xin, "Show me the report in your hand, I have a little impression, it should be the book in your hand that has analyzed the problem of diversion." ”

Xu Xin hurriedly handed over the heavy report in his hand.

Yan Peng glanced at the catalog, and then flipped to the position he was looking for, looked at it for a long time, licked his tongue from time to time and turned to the next page, as if there was no one around.

"I'm getting older, and I can't concentrate very well."

He had been standing, saying this, and sat on the couch and continued to look through the report.

Xu Xin drank tea on the side while looking through the hydrological data that he couldn't understand at all.

"That's right." Yan Peng suddenly spoke.

"What's right?" Xu Xin hurriedly put down the teacup.

"The Huangjiang River was diverted hundreds of thousands of years ago, and it is in the territory of Xingfu City. Of course, this is a clue that I stumbled upon and analyzed in the report, but did not verify it in depth. ”

Yan Peng put down the report and looked down at the water system map on the table, "The Huangjiang River has nurtured this large area, as well as countless cities and counties downstream. You see, this Jianhe County, just on the edge of the Huangjiang River, is famous for its hot spring vacations, has a developed underground water system, and is inextricably linked with the Huangjiang River. ”

"What does that mean?" Xu Xin didn't understand.

"Wherever the river used to flow, it is all reasonable. There are so many big rivers in Heijin Province, and they have undergone large-scale diversions, and they are well documented, and there is only one of them. ”

Yan Peng gave a conclusion very firmly, "If the section you showed me is really a riverbed, nine times out of ten it is the course of the Huangjiang River." ”

"This place, and the current location of the Huangjiang River, the nearest distance is almost 100 kilometers, which is too far." Xu Xin couldn't figure it out.

"A hundred kilometers is not too far."

Yan Peng took Xu Xin to stand in front of the water system map and pointed to a far place in the upper reaches of the Yellow River, "The reason why I analyzed the diversion of the Yellow River in the report is because I found a small alluvial plain here, and there are no big rivers passing through here, so it is inferred that the Yellow River once flowed from here." ”

The position of his finger is already more than 500 kilometers away from Huangshui County in the upper reaches of the Huangjiang River.

"If that's the case, the direction in which the Huangjiang River flowed in the past is completely different from what it is now!"

"Yes, if the speculation is correct, the old Huang River has a large circle to the north of the new Huang River, and the farthest point is even hundreds of kilometers away from the current river channel."

"Senior, I see that your report draws a picture of the runoff of the Lao Huang River before the diversion, and the dotted line is drawn." Xu Xin saw a little doubt in the report that Yan Peng had spread.

"This is my speculation, because there is no on-site investigation and verification, and I can't do it at all."

Yan Peng smiled, "This kind of practice is very imrigorous and should not be presented in a formal report." ”

"Your speculation is very specific, there are bends in the dotted line in these places, and there are S-shaped river types."

Xu Xin thought that he was indeed a doctor, and even the speculated river was painted as if it were real.

"I have run along the surface of this presumed runoff of the Yellow River, because the river channel is piled up with dirt breccia, and the soil is loose, often with pine forests, cypress forests, etc., and the trees are tall and have a certain indicative effect on the surface.

Of course, this approach is not rigorous, because it is not evidence of uniqueness. ”

"Senior, have you ever thought that your speculation may have a very wide impact?" Xu Xin laughed.

He thought of a possibility.

Why did the Southwest Gold Rush, or the Huangjiang Gold Mine, only find placer gold at the bottom of the river, but never found the primary gold mine?

Because they don't know that the Huangjiang River has been diverted, the so-called upstream of the Huangjiang gold rush point may not really be upstream.