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Chapter 326: Governance Strategies!

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    "In terms of geomorphology, the Yellow River Basin is located in the transition zone of various geographical elements, where various geographical elements intersect and the ecological environment is relatively fragile."

    "In terms of terrain, the Loess Plateau has few flats, many slopes, broken ground, and frequent geological disasters such as landslides, mudslides, and subsidences."

    "In terms of soil quality, because the loess structure is loose, porous and vertically oriented, the soil material is easily soluble in water and easily eroded."

    "In terms of precipitation, the precipitation in the Yellow River Basin is concentrated in the summer flood season, and there are many heavy rains in the summer flood season."

    "In terms of vegetation, it is because the vegetation has suffered serious damage, and the surface of most areas is exposed."

    The voice just fell.

    Fang Xuanling couldn't help but praised happily: "Yeah, not bad! King Jin's analysis is very reasonable, we have never thought about such a problem before!"

    "Then what is the artificial reason?" Fang Xuanling asked curiously with a puzzled expression.

    Li Yunhe explained calmly after hearing the words: "My master said that there are four reasons for man-made as follows."

    "One is because the economy of the Yellow River Basin in the Tang Dynasty has developed rapidly in recent years, and the population has increased sharply. To solve the food problem, the people have opened up steep slopes, over-cultivated, and a large number of trees have been felled, making the surface unprotected, vulnerable to erosion, and loose.  .¡±

    "Secondly, excessive woodcutter harvesting, deforestation, destruction of vegetation and trees, so that the surface gradually lacks the protection of vegetation."

    "The third is war and building palaces. A large amount of vegetation was burned or felled as building wood."

    "Fourth, the excessive use of cultivated land, the rotation of barren makes the surface lose the protection of natural vegetation or crops, thins the soil layer of cultivated land, loses soil nutrients, and reduces the fertility of cultivated land, resulting in a decrease in grain yield per mu."

    "These acts of man-made destruction have caused the deterioration of the local ecological environment, directly or indirectly inducing and exacerbating natural disasters."

    "In the season of frequent rainstorms in summer, a large amount of sediment flows into the Yellow River, and the sediment content of the Yellow River increases sharply."

    "A large amount of sediment is deposited on the downstream riverbed, which raises the upstream riverbed and becomes a suspended river on the ground, which intensifies the impact of heavy rain and floods on the embankment, and poses a greater threat of flooding."

    As soon as the words fell, Li Shimin and all the ministers suddenly realized.

    Afterwards, Changsun Wuji asked curiously with doubts on his face: "Then how to deal with the Yellow River flood?"

    Li Yunhe smiled slightly when he heard the words, and said lightly: "Master just used this question to test me."

    "Master said that only by analyzing and clearly understanding the causes of the floods in the Yellow River, can we better start to solve the floods in the Yellow River based on the causes."

    "Then how do you answer?" Li Shimin asked curiously after hearing the words.

    Li Yunhe talked calmly and eloquently: "I am frank and right. The water in the Yellow River is very turbid. It is called one stone of water and six buckets of mud."

    "We can learn from the historical experience of Jia Rang in the Western Han Dynasty's "Three Strategies for River Control" to make the river course wide and slow, wide river flood, reasonable diversion, build canals and gates, develop irrigation from the Yellow River, divert flood water, repair and raise the height  Fortify the embankment."

    "In addition, in the future, we must avoid competing with the river for land, pay more attention to agriculture and mulberry, and pay attention to the silting, dredging, dredging, soil improvement, and drainage of the river."

    The voice just fell.

    "That's right, your management strategy is very appropriate." Li Shimin nodded when he heard the words, and praised happily.

    Li Yunhe was startled when he heard the words, then frowned, and said in a deep voice: "But Master said that this is only a temporary solution, not the root cause, and it is far from enough to solve the Yellow River flood from the root cause."

    "We can also solve the flood of the Yellow River by adapting measures to local conditions in his ten strategies for treating the Yellow River."

    "One is to plant more trees and grasses, return farmland to forests and grasses, expand the planting area of ??forests and grasses, increase vegetation coverage, conserve water and soil, and strengthen water and soil conservation."

    "Master said this is one of the fundamental measures to control the flooding of the Yellow River."

    "Secondly, in the cultivation area, land leveling, cultivation, field management, fertilizer application, rotation and intercropping and the construction of forest protection nets shall be vigorously adapted to local conditions."

    "At the same time, carefully select and breed fine varieties, develop plastic film, sprinkler irrigation and drip irrigation technology, scientific fertilization, etc., improve soil fertility, maintain water and soil, and develop scientific agricultural production."

    "The third is to close slopes for forestry and grassland cultivation and build horizontal terraces in gentle slope areas."

    "The fourth is to build check dams, small reservoirs and shelter forests in valleys."

    "Fifth is water and sand regulation, flood diversion and silt release, mechanical dredging of the river, using engineering facilities and dispatching means, through the impact of water flow, the Yellow RiverThe silt is sent to the sea in good time, thereby reducing the siltation of the Yellow River bed and increasing the flood discharge capacity.  "

    "Build a high dam reservoir in the canyon to reduce flood and retain sediment, regulate water and sediment, transport high-concentration sediment, store clear water and discharge mud."

    "Flood and sediment are widely used in the watershed, such as flood diversion, high-sand muddy water irrigation, dredger discharge of silt and reinforcement of dams, etc." (Remember the website website: www.hlnovel.com
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