How many years has the history of Linli Li River?

Lishui is a large water system with a large coverage. I can't find the specific time limit, so much for the detailed introduction of Lishui. . If you still need help, please continue to ask. If it helps, please accept the praise. . Thank you. I wish you progress in your study. 、、

Lishui River system has branches and tributaries 196 in Shimen County, accounting for 83% of the total number of streams in the county. The drainage area is 3347.95 square kilometers, accounting for 84.3% of the county's total land area. There are 2 1 first-class tributaries such as Xishui, Daoshui and Lianshui in China, of which 10 tributaries flow into Lishui in China. There are 6 secondary tributaries1,85 tertiary tributaries and 28 tertiary tributaries. Jiuli refers to the main stream of Lishui and its eight tributaries, collectively referred to as Jiuli. Li Daoyuan (AD 466 ~ 527) uploaded the Notes on Water Classics: Li Jiushui, which was called Wen, Zhong, Huang, Confucianism, Taoism, Tan, Lian and Huan, with the total name of Li. Except for Ru and Ju, all the other seven waters originate from or flow through Shimen County, and Shimendeli is second to none in Changde City.

Lishui is one of the four major rivers in Hunan Province. There are three sources: north, south and middle. Beiyuan is Qiyan Spring at the junction of northwest Sangzhi County and Hefeng in Hubei Province; Zhongyuan is a fairy cave on the Lishan slope at the junction of Longshan and Xuanen in the northwest of Sangzhi County, Hubei Province. Nanyuan is 100,000 square meters in Longquan Village, North Wanshou Mountain, Yongshun County, and the two places are surrounded by water, hence the name Longjiang Kou. Sanyuanhui flows through the west of Sangzhi County, the southeast of Sangzhi, Yongshun, Zhangjiajie (Dayong), Cili, Shimen, Linli, Lixian and Jinshi, and then flows into Qili Lake of Dongting Lake.

The main stream of Lishui River runs from Cunninghamia lanceolata in Sangzhi County to Xiaodukou in Tianjin, with a total length of 388 kilometers and a drainage area of 18496 square kilometers. In the north, the northern branch of Wuling Mountain is separated from the Qingjiang River system in Hubei; in the south, the southern branch of Wuling Mountain is separated from the Yuanshui River system; in the west, it starts from Chongshan Mountain in Hunan and Hubei, and borders Dongting Lake Plain in the east. The terrain is high in the north and low in the west, high in the east and low in the west; The main stream and main tributaries flow from northwest to southeast, forming a parallel water system.

Heyuan to Zhangjiajie (Dayong) is the upstream, Zhangjiajie to Shimen is the middle reaches, and Shimen to Tianjin Xiaodukou is the downstream. The middle and upper reaches are limestone sedimentary areas, which are easy to form karst landforms (karst landforms), with deep canyons and towering stone walls along the way. The lower reaches are tertiary red sandstone and quaternary alluvial area, which are easy to be eroded, forming low hills, platforms and alluvial plains with open and flat terrain.

Lishui River flows eastward from the source, enters Jiexi River in Xinguan Town, west of Shimen County through Guniuyan in Cili County, and is divided into second-rate rivers in Guangdong and Guangzhou, which are integrated under the continent. It is flooded at the mouth of the Jiahe River and reaches the haunted house rock (it is reported that haunted house rock is often a shipwreck. In the Republic of China 13, He Longjun was blown up by gunpowder, and the three rivers joined together, commonly known as Sanjiangkou (the so-called Qiangkou in Li Daoyuan's Notes on Water Classics). The merged river flows from west to east through Renjiafang, Xiangjiaping, Yanjingtan, Dalongtan, Zhuyuanbeng, Xinjiekou, County Town, Yanjiaba, Yijiadu and Tiegong Dike, and merges into tributaries along the way. Finally, it entered Linli County in Qinglong Bay (also known as Longxikou) in Erdu Township, passing through four towns: Xinguan Town, Chujiang Town, Yijiadu Town and Erdu Township. The cross-river length of Shimen well is about 30 kilometers, and the slope is 5‰. The main river basins in the county cover an area of 342.48 square kilometers (excluding Xishui, Daoshui and Lianshui basins). There are 16 beaches in the main stream from top to bottom, such as Sanjiangkou, Yanjing Beach, Erchengrong, Huifu Beach, Yanling Beach, Bajiaolou and Dongfang Beach (also known as Gu Ni Beach). In ancient times, it was a section of river from Sanjiangkou down through Shimen City, also known as the Zero Yang River. During the Jin Dynasty, the downtown area of North Shore Street on the riverside was under the jurisdiction of Liyang County, where Tianmen County was located.

1966, the Qingshan water conservancy pumping station was built in the downstream of Linli County, which significantly changed the river characteristics of the upstream transit section. On the one hand, due to the rising water level, the river flowing from the main channel washes the embankment all the year round, causing the embankment to collapse seriously. According to observation, since the completion of the dam, the banks of Yijiadu Town and Erdu Township have pushed inward by an average of 30~50 meters, and the iron bow dike at the widest point has pushed inward 150 meters. On the other hand, after the completion of the dam, the river speed slows down and the sediment carrying capacity weakens. In addition, there is serious soil erosion in the upper reaches, and a large amount of sediment is deposited at the bottom of the river, which aggravates the water level rise and flood control pressure along the river. According to the observation records of hydrological station, the riverbed from the dam of Qingshan Hydraulic Pump Station to Yijiadu was raised by more than 1.980 ~ 1.989 on average.

1976, Shimen county built Sanjiangkou hydropower station on the main stream of Lishui, 3 kilometers upstream from the county seat.

1970 since the winter, Shimen county has built a large-scale dike project, and successively built flood control dikes on the south and north banks of the main stream of Lishui. 1987 65438+In February, a 2. 1 km riverbank was built in Renjiafang Village, Xinguan Town, south bank of Lishui to protect 530 mu of farmland in the embankment. In the future, we will focus on the construction of river banks in Shimen County. Up to now, the total length of the levee on the north bank of Lishui River is17.3km, starting from the urban wharf in the west and going down to the dam attached to Qingshan Hydraulic Pump Station, passing through Chujiang and Yijiadu towns. The south bank dike is 2 1.2km long, starting from Xinjiekou Ferry and going down to Long Village in Erdu Township, and passing through Erdu Township and Baofeng Development Zone, protecting 27.5km2 of land in Shimen County, the political, economic and cultural center on both sides of the strait, with a population of158,000. In particular, the flood levees of about 9 kilometers on the north and south banks of the urban area started from 199 1 year 1 1 month and were fully completed by the end of 2002. It took 12 years to build the most beautiful scenery along the river on both sides of the city and become a "popular project" for the benefit of future generations. The flood dike and the rebuilt Jiang Yan Road have added many scenic spots to the Lishui River, which runs day and night. In Dishan, pedestrians can't finish watching the sunset by the Lishui River and the shining lights in the street.

There are four railway and highway bridges in the main stream of Shimen Lishui. Sanjiangkou Bridge, built in 197 1, is a dual-purpose railway and highway bridge. It is the first bridge of Liu Zhi Railway across Lishui. Cars pass on both sides of the bridge, and the traffic on Cili-Zhanggongmiao Highway is unimpeded. The dam of Sanjiang Power Station is also a highway bridge. 1993 10 6 16, Lishui Shimen highway bridge in the center of the county was opened to traffic. The completion of the bridge will connect the county towns on the north and south sides of Shimen into a whole. 1October 8th 1993, Shimen Lishui Bridge on Shichang Railway started, and was completed in June 1995, with a total length of 1590. 146m and 58 piers. This is the Lishui Highway-Railway Bridge, which plays an important role in communicating traffic and promoting economic prosperity in northwest Hunan.

The river flows eastward day and night. Chujiang Town, Shimen County, which stands by the water, is like a magnificent picture scroll, spreading under the blue sky and white clouds.

She borders Lishui in the southeast and hills in the northwest. The terrain is long and narrow, commonly known as boat-shaped land. "The terrain is dangerous, the ring is blocked, the city is the city, and the stream is the pool", so it is called the mountain city. In the past, there were many wars and floods. On the eve of liberation, the population was less than 3,000, and there were only over 40 shops with an area of only 0.4 square kilometers. Since the founding of the People's Republic of China, 45 streets crisscross, with an area of 16.8 square kilometers and 70,000 residents. The natural and beautiful mountain city is more colorful after being carefully dressed by Shimen people. On the Lishui River, four bridges, such as Wolong, break the waves. As arteries connecting all parts of the country, Liu Zhi and Shichang Railway crisscross at the foot of Baiyun Mountain and under the 19th Peak. On both sides of the Lishui River, there are many high-rise buildings and rows of streets, such as strings and traffic. Flower beds and green trees are all over the streets, and the fragrance of flowers is growing day by day, which makes the spring scenery of the county town permanent. Opposite Baofeng, Dongcheng and Chujiang are each other's horns, and a brand-new city is rising rapidly on the banks of the Lishui River. Today, Shimen County has complete municipal facilities, and it is also a national health county, a national demonstration site for creating civilized small towns, and a scenic city in Hunan Province. Shimen, a beautiful new city, is opening a splendid door to the world and the future.