What is the upper reaches of the Pearl River, and the characteristics of the upper, middle and lower

The Pearl River is now the general name of the three rivers of Xijiang, Beijiang and Dongjiang. The basin spans six provinces and regions of Yunnan, Guizhou, Guangxi, Guangdong, Hunan and Jiangxi, covering an area of more than 10,000 square kilometers (including more than 10,000 square kilometers flowing through Vietnam). There are many tributaries of the water system, and the waterways are criss-crossed.

The Xijiang River is the mainstream of the water system, originating from Maxiong Mountain, Zhanyi County, Yunnan Province. The upper and middle reaches of the main stream are called Nanpan River, Hongshui River and Qianjiang River respectively.

and Xunjiang, in Wuzhou below called Xijiang. The main stream is 2,129 kilometers long and has a basin area of 10,000 square kilometers. The main tributaries are the Beipan River, the Liujiang River, the Yujiang River and the Guijiang River. The total drop is 2,130 meters. Huangguoshu Waterfall on the Beipan River.

The water head is up to 70 meters. The source of the Beijiang River is Zhenshui, which originates in Xinfeng County, Jiangxi Province. In the vicinity of Shaoguan, it meets Wushui and is called Beijiang. The water flow above Shaoguan is turbulent, and the river below Shaoguan is straight, and there are Huangjiang River and Lianjiang River along the way.

Merge in, enter the plain after crossing the Yuzi Gorge and Feilai Gorge, the river is wide and shallow, and flows into the Pearl River Delta to Sixian Cellar.

The main stream is 582 km long. The Dongjiang River originates in Dazhuling, Xunwu County, Jiangxi Province. The upper source is called Xunwu water, and it flows into Guangdong Province in the southwest. The upper river is narrow and shallow, with mountainous banks and a main stream of 523 kilometers long.

The upper reaches of the Pearl River include the Xijiang, Beijiang and Dongjiang rivers, while the source is the Xijiang River from the Yunnan-Guizhou Plateau, specifically in the Maxiong Mountains in Qujing City, Yunnan.

The Pearl River is characterized by a large volume of water, a large basin area, and a long flow. There are many tributaries, the seasonal change of water level is small, the sediment content is small, and there is no ice period, which flows into the South China Sea.

In the Qing Dynasty, the Pearl River cities entered a period of rapid development, the number of cities increased, and the spatial distribution of cities laid the basic pattern of the spatial distribution of modern and contemporary Pearl River cities. It is a common phenomenon to build cities close to water, but the proximity of Pearl River cities is different from that of the Yellow River system.

The Pearl River system is different from other water systems in that it is a composite water system, with three main streams and several tributaries, each of which has a different natural geographical environment and therefore different urban distribution. In addition, the natural geographical environment of different sections of each main stream is different, and the distribution of cities is also very different. This paper examines and analyzes the distribution and characteristics of cities along the Pearl River in each section of the Qing Dynasty by combing the relevant geographical data.

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The location of cities in the Pearl River system from the river basically follows the spatial distribution law that the upstream is farther than the middle reach, and the middle reaches are farther than the downstream. The above phenomenon is directly related to the topography and landform of different river sections.

There are many high mountains and valleys in the upper reaches of the three main streams of the Pearl River, mountains and hills in the middle reaches, and low and gentle alluvial plains in the lower reaches. Therefore, some sections of the upper and middle reaches of the Pearl River pass through many canyons or jungles and mountains, and there is no space for building cities and developing agriculture, so the construction of cities lacks geographical conditions and economic hinterland support.

The Pearl River belongs to the hotter areas in southern China, originating from the Yunnan-Guizhou Plateau, flowing through the Pearl River Delta of Guangdong Province, the upper reaches of the Yunnan-Guizhou Plateau and the Hengduan Mountains, the lower reaches of the alluvial plains, the land is fertile, and the region belongs to the Pearl River Delta Economic Circle, one of the three major economic circles in China.

The Pearl River originates from the Maxiong Mountains of the Wumeng Mountains of the Yunnan-Guizhou Plateau. It flows through six provinces and regions in central and western China and northern Vietnam, and flows into the South China Sea from eight estuaries downstream.

The Pearl River originally referred to a 96-kilometer-long waterway from Guangzhou to the mouth of the sea, named after the famous Haizhu Island, and gradually became the general name of the Xijiang, Dongjiang, Beijiang and the rivers on the Pearl River Delta. There are 774 large and small rivers in the Pearl River water system, with a total length of more than 36,000 kilometers, abundant river water and numerous tributaries, which have brought superior conditions to the shipping industry of the Pearl River, and the shipping value is second only to the Yangtze River, ranking second in the country.

Hydrological characteristics of the Pearl River.

In the Pearl River system of Guangdong, the Dongjiang River, the Liuxi River and the Beijiang River flow roughly from northeast to southwest, and the Xijiang River and Tanjiang River flow roughly from west to east, and all converge in the Pearl River Delta network river area, and finally flow into the South China Sea by 8 major gates respectively, and the whole water system is a fan-shaped water system.

The topography of the Pearl River Basin in Guangdong is roughly inclined from north to south, and the highest peak, Shikenggang, is 1,902 meters above sea level. The area of the left bank of the main stream of the Pearl River is more than twice that of the right bank. The density of the river network is relatively large, and the density of the river network in the delta area is more than one kilometer per kilometer.

The bending coefficient of the main stream is that the main stream is a flat river.

The birthplace of the Pearl River is located at the eastern foot of Maxiong Mountain, 50 kilometers north of the city of Zhanyi District, Qujing City. The traffic of the source of the Pearl River is very convenient, and the car can go directly to the source.

Introduction to Pearl RiverThe Pearl River, also known as the Yue River, is the second largest river in China and the third longest river in China according to its flow. The Pearl River originally refers to a 96-kilometer-long waterway from Guangzhou to the mouth of the sea, named after the famous Haizhu Island Stone, and later gradually became the general name of the Xijiang, Dongjiang, Beijiang and various rivers on the Pearl River Delta.

The Pearl River originates in the Maxiong Mountains of the Wumeng Mountains of the Yunnan-Guizhou Plateau, flows through six provinces in central and western China and northern Vietnam, and flows downstream into the South China Sea from eight estuaries to the South China Sea. In 2012, researchers from the Institute of Remote Sensing Application of the Chinese Academy of Sciences used satellite remote sensing technology to measure the length and basin area of the Pearl River, and obtained accurate data, determining that the Pearl River is the second largest river in China.

The birthplace of the Pearl River is Maxiong Mountain, Zhanyi District, Yunnan Province.

It is named because it flows through Haizhu Island; It is the general name of the eastern, western, and northern rivers and the downstream delta rivers, originating from the Maxiong Mountains of the Wumeng Mountains of the Yunnan-Guizhou Plateau, flowing through six provinces and regions in central and western China and northern Vietnam, and flowing into the South China Sea from eight estuaries in the downstream.

The Pearl River Tour is a major feature tour of Yangcheng in the south, the beautiful scenery of the Pearl River is comparable to that of Victoria Harbour in Hong Kong, its scenery is charming, the clear water is gorgeous, the Chinese lights are flashing, like a seven-colored pearl inlaid with ten miles of the Pearl River, converging into a colorful Pearl River rainbow.

Runoff

The average annual runoff in the Pearl River basin in Guangdong is 114.4 billion cubic meters. Among them: 25.1 billion cubic meters of the Dongjiang River, 45.7 billion cubic meters of the Beijiang River, 12.3 billion cubic meters of the main stream of the lower reaches of the Xijiang River, and 31.3 billion cubic meters of the Pearl River Delta.

The average annual runoff depth is mm, the average annual runoff depth is 800-1800 mm, and the average runoff coefficient is in. The runoff modulus is liters and seconds per square kilometer, and the runoff modulus in various places is in liters and seconds per square kilometer. The coefficient of annual runoff variation is between; The absolute ratio of annual runoff is Dongjiang (Boluo Station), Beijiang (Shijiao Station) and Xijiang (Gaoyao Station).

The Pearl River is the longest river in southern China and its source is located on the Tibetan Plateau in southwest China. The Pearl River is about 2,400 kilometers long and flows through six provinces: Guangdong, Guangxi, Hunan, Jiangxi, Fujian and Guizhou.

The geography of the place of origin.

The source of the Pearl River is located in the southeast of the Qinghai-Tibet Plateau, mainly distributed in Yunnan, Guizhou and Guangxi, with an altitude of 2,300-5,300 meters. The terrain here is complex, with undulating mountains, ravines and ravines, and the climate is cold and arid, which is a typical alpine meadow climate zone.

The ecological environment of the birthplace.

The area of the birthplace of the Pearl River has a unique ecological environment and high conservation value. It is rich in water, dense vegetation and rich in biodiversity. A variety of rare and endangered wild animals and plants thrive here.

The importance of the birthplace of the Pearl River.

The birthplace of the Pearl River is an important ecological barrier to maintain the water resources of the Pearl River Basin, and plays a very important role in the maintenance and protection of the ecosystem of the Pearl River Basin. At the same time, it is also a national key nature reserve in China and is listed as a key ecosystem area of UNESCO's "World Network of Biosphere Reserves".

The impact of development on the place of origin.

With the continuous development of social economy, the source area of the Pearl River is facing a variety of environmental problems, such as climate change, land degradation, water pollution, etc. These problems have had an impact on the water resources of the Pearl River Basin. Therefore, while developing the economy, it is also necessary to strengthen the protection and governance of the birthplace of the Pearl River.

Measures for the ecological protection of the birthplace.

In order to protect the ecological environment of the birthplace of the Pearl River, the relevant departments have formulated a series of measures, such as strengthening the management and protection of nature reserves, promoting ecological migration, and strengthening soil and water conservation. At the same time, it is also necessary to strengthen the public's awareness of environmental protection and jointly create a good atmosphere for ecological protection in the birthplace of the Pearl River.

Summary. Located on the Tibetan Plateau in southwest China, the source of the Pearl River is an important ecological barrier and protected area. While the economy is developing badly, we need to strengthen the protection and management of the birthplace of the Pearl River, and jointly maintain this beautiful natural scenery.

Pearl River is more than just a city. The Pearl River Basin is located between 21°31 -26°49 north latitude and 102°14 -115°53 east latitude. The basin starts from Nanling in the north to Yunwu, Yunkai, 60,000 Mountains, 100,000 Mountains and other mountain ranges in the south; From Lotus Mountain in the east to Wumeng Mountain Range in the west.

It is located in 6 provinces and regions including Yunnan, Guizhou, Guangxi, Guangdong, Hunan and Jiangxi, and the upper reaches of its secondary tributary, Zuojiang, are in Vietnam. The basin covers an area of 453,690 square kilometers, of which 10,000 square kilometers are in the domestic part, accounting for the total area of the country. The annual runoff is second only to the Yangtze River, and the length and basin area rank fourth in the country.

The Pearl River is a composite water system formed by the convergence of the Xijiang, Beijiang, Dongjiang and the rivers of the Pearl River Delta, originating from the Maxiong Mountain of the Wumeng Mountains of the Yunnan-Guizhou Plateau, flowing through Yunnan, Guizhou Mosheng, Guangxi, Guangdong, Hunan, Jiangxi 6 provinces (regions) and the north of Vietnam, thus forming the characteristics of many tributaries and waterways, and flowing into a network of rivers in the downstream delta, passing through the Humen, Jiaomen, Hongqimen (Li), Hengmen, Modaomen, Jiqimen, The Tiger Leaping Gate and the Cliff Gate flow into the South China Sea.