Heading into April, there was significantly more rain than usual.
Because all localities are reinforcing the river and dredging some silted rivers, the hydrological observation data is relatively complete.
Above Xiangyang in Hanshui, the forest vegetation is poorer, and the Forestry Institute believes that due to geographical reasons, the rainwater conservation period of this generation is very short.
Historically, there have been many records of sudden floods.
The Jingjiang area used to be the same, but it has improved greatly in recent years.
In addition, the rebuilding of dikes in some lake areas and the dredging of silted channels have increased the capacity of flood storage and flood control.
Sun Jing's main job in Xiangyang was to build river embankments, but the Fisheries Research Institute decided that this was not enough.
It is necessary to count and evaluate the situation of rivers and lakes in the entire Han River basin, so as to open the floodgates and release water in a planned manner, and regulate the discharge of floods.
Because the coordination of several cities was required, the plan of the investigation was sent to the residence of the fairy Zhang Chun.
Yu Yanshi from the Institute of Fisheries and Kuang Bingyan from the Institute of Forestry brought the plan, along with Luo Ming, an American teacher from the Department of Forestry at Jinling University in Nanjing, and Li Deyi, an assistant professor.
Jinling University is a church school, and because of Tian Ruiyu's relationship, Jinling University has established a certain connection with Xinmin University.
A native of North Carolina, USA, he graduated from the University of Oxford with a degree in forestry and geology.
He has already taken people to the Yellow River valley to investigate the problems of vegetation and soil erosion.
He does not understand Chinese, but another teaching assistant, Ren Chengtong, has read articles in Xinmin Bao on the relationship between forest vegetation and precipitation and surface runoff, although Xinmin Bao is full of popular science articles, but it can be seen that the Ezhong Autonomous Government attaches great importance to forest protection and soil erosion.
So Ren Chengtong suggested that Luo Ming come to Xinmin University to have a look.
Luo Ming happened to meet Xinmin University and tried to investigate the flood storage and flood control capacity of the Hanshui Basin.
So I asked to come and see Zhang Chun together.
"This requires the cooperation of the Bureau of Surveying, Mapping and Surveying."
Zhang Chun looked at the report and said.
"The Survey Bureau has produced a mapping map of the area, and they have made estimates.
But we don't think it's enough.
As soon as you come down from Xiangyang and pass Jingmen, you will arrive at the ancient Hongze Lake area, where there are many lakes.
When the water level rises to a certain position, many places will open the flood gates, Dachai Lake, Zhou Lake, Changhu Lake, the entire Qianjiang River to Wuhan three towns, the water situation is complicated.
Improper treatment not only fails to drain floodwater, but causes waterlogging.
We calculated the situation after the change in the water level in the lake area.
It's hard to sort out.
Therefore, we hope to investigate as soon as possible so that we can develop a plan for the gradual release of water during the flood season.
At the same time, we have identified several rivers that must be cleared to allow the flow of floodwaters to be controlled. ” Kuang Bingyan lightly drew a few lines with a pencil on the map in Zhang Chun's house.
Kuang Bingyan is now the director of the Fisheries Institute.
"What will be the impact during the dry season after opening?"
"If there is no gate, it will have an impact on the dry season.
It will reduce the amount of water in some lake areas.
Although it is possible to increase the area of cultivated land.
But at the same time, it will also reduce the area of irrigation.
So we decided to install the gates.
But when, what kind of water level to open the sluice gate to release water or close the sluice.
We need more investigation to complete. ” Zhang Chun smiled: "I support this plan." ” Li Deyi couldn't help but say: "Sir, why install the gate, the reduction of the irrigation area can be replaced by dryland cash crops such as cotton and linen."
Sichuan, Hunan and Jiangsu have been widely planted, and the sales revenue of the products produced is very good. ” Kuang Bingyan hurriedly introduced: "These two are teachers Luo Ming and Li Deyi from Jinling University, and they are here to exchange and study. ” Zhang Chun explained: "Planting cotton and linen has indeed earned a good income in recent years, and Hubei also grows it.
However, it cannot be promoted on a large scale.
The cotton and linen in Hubei have adopted the method of interplanting, which is for high and low cooperation.
Increase the path of rainwater collection to the ground, reducing the impact on the soil.
A variety of crops can also increase the rate of straw returning to the field, increasing the amount of humus in the soil, which can increase the retention time of rainwater.
Large areas of farmland are much less exposed to precipitation than forests.
This research by the Agricultural Institute has proven that.
You guys can take a look at it when you have time. ” "It's a very advanced theory."
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Luo Ming looked at Zhang Chun curiously, and he spoke in English: "What I see in the Yellow River basin is completely different from here, where soil erosion is very serious. ” Zhang Chun glanced at him appreciatively: "In fact, the thing is not only that, the development of society depends on the great abundance of materials, this sentence is not about the number of individual species, but the number of species, which means how many materials we can use."
A single crop does not make the material extremely rich, but greatly reduces the material.
Not only species, but also individual species will rapidly decline at a certain stage, because the nutrients required by individual species are specific, while the nutrients of the soil are not infinite.
When a certain limit is reached, it will naturally affect the yield.
The Yellow River Basin is in such a vicious circle, which eventually leads directly to desertification, and massive soil erosion accelerates this process, making it unlivable. ” "Why is it not allowed to use fertile field powder in Hubei?
This can supplement the lack of nutrients in the soil, is it also based on the above reasons?
Luo Ming asked.
"Yes."
Yu Yanshi nodded and said, "Our research shows that fertile field powder is extremely harmful to species. ” "Can I read the report?"
Luo Ming asked.
Zhang Chun smiled: "Yes, but you must stay at Xinmin University." ” Luo Ming was refreshed: "I don't know if I can participate in Mr.
Yu's research project." ” Yu Yanshi also smiled: "If you stay at Xinmin University, it's not that you can't, but I don't know if you can be admitted to the graduate school." ” The two of them said casually, but Li Deyi was taken aback.
You must know that Luo Ming is a top student at Oxford University, and he still needs to take the exam here, rather than being directly hired as a teacher. ” Luo Ming was also very surprised.
However, Zhang Chun and Yu Yanshi's attention had already shifted to the map.
"How much influence do aquatic plants have on water flow?
What are the rules of the growth of flooded plants in the Qianjiang area?
” "Aquatic plants are able to severely block the speed of water flow and raise the water level.
We've been looking at the area for six years.
The water level curve of Qianjiang River has a tendency to flatten year by year, which is directly proportional to the abundance of this forest.
In agriculture, we are also trying to improve as much as possible, and we draw on school ratings and divide them into grades according to the fertility of the soil.
However, we have found that soils can evolve if they are managed properly.
It is related to the amount of humus, microorganisms, and underground organisms.
Yu Yanshi was quite proud: "The residence time of water and fertilizer in humus is also increasing, and the effect of a single field is not obvious after evolution, but it is different when the area is large." ” "But floods can bring a lot of water to destroy plants, and at some point they can block the river.
Not much of a problem in the Lake District.
But aquaculture and fishing are very difficult to control.
Both overfishing and overfarming have unexpected problems.
In recent years, there has been an increase in the number of birds in the Lake District, as well as some animals such as otters.
Others, such as pufferfish, are migratory.
We had a lot of headaches when we built the sluices, because the sluices would stop the animals from migrating, but the new rivers were all close to being blocked.
Kuang Bingyan said with a smile.
"What about the income of the fishermen in the fishery.
I saw a lot of eggs and a lot of fish in the market, so I really had to be careful. ” "The fishermen's main income is still from the cultivation of aquatic vegetables and fish in cages.
In addition to seasonal restrictions, the fishing industry also imposes restrictions on fishing methods.
The publicity of the fishery institute has been good.
Some fish and fur processing industries also provide employment opportunities for fishermen.
The key is the utilization of the property.
The utilization rate of large fish is significantly higher than that of small fish.
So the fishermen are paying attention. ” Zhang Chun drew a map of the upper reaches of Yichang and said: "Mr.
Sun mentioned this year that he would build a dam in the Three Gorges to store water and generate electricity. ” Kuang Bingyan frowned: "It's really hard to judge whether this is good or bad."
If it's not worth it just to generate electricity, there are many ways to solve it.
According to the Institute of Electronics, if we can solve some manufacturing problems, we can use the sun to generate electricity.
Hydro can generate electricity, and wind can generate electricity, but there is no demand for this right now.
The microorganisms of the biogas digester will also evolve, and the utilization rate of the biogas digester has been increasing year by year in recent years. ” "Yes, if this dam is built, at least the sturgeon and puffer fish will disappear, and there will be some other problems.
Because it affects a river.
I hope that you will investigate the migration patterns of fish, and the gates you build will still have some impact, so you must investigate them clearly.
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We can't rush for quick success. ” Zhang Chun's decision this time made him happy for a long time.
Because from June, it rains constantly.
The water level of the Han River has been rising, and the waterlogging in the Han River basin is also slowly rising, and if it were not for the role of the flood control system, it would have been a disaster.
The water level of Dachai Lake, Changhu Lake and Honghu Lake has risen and has not come down after two or three years.