General situation of Wujiang main stream

Wujiang River originated in Sanfengling, Linwu County, Hunan Province, and its main stream flows through five counties in Hunan Province, such as Linwu County, Yizhang County, Chenxian County, Guiyang County and Rucheng County, and Lechang County, Ruyuan County, Wujiang District and Zhenjiang District of Guangdong Province. It meets Zhenjiang River in Zhenjiang District of Shaoguan City, forming the main stream of Beijiang River in the Pearl River system. The total length of the main stream is 260 kilometers, including 92 kilometers in Hunan Province and 152 kilometers in Guangdong Province. The basin covers an area of 7,079 square kilometers, including 3,734 square kilometers in Guangdong and 3,480 square kilometers in Hunan.

In Linwu County, it is called Wushui River, which starts from Sanfengling, Xishan, Wuyuan Township, flows through the county, Wushui Town, Fenshi Township and other places, and enters Yizhang County. The total length of the county seat is 63.5 kilometers. The drainage area is 1 138.89 square kilometers, with an average slope of 2.4‰.

In Yizhang County, the mainstream of Wujiang River enters from Guiyao Village in Jiang Shui Town, passes through Jiang Shui Town, Matian Town and Censhui Village in Mei Tian Town, and enters Lechang City, Guangdong Province. It flows through the county seat for 30 kilometers, with a drop of 19 meters, an average gradient of 6.55‰, and a drainage area of 33 1.6 square kilometers.

In Lechang City, it enters from Sanxi in the northwest, flows through Wujiang Gorge of Dayaoshan in the southeast through Shi Ping, and exits through Zhang Tan, Lecheng, Changlai and Ankou, connecting with Ruyuan County. In the Southern Tang Dynasty, the section from Linwu to Shiping Town in Hunan was called Wuxi, the section from Shi Ping Town to Lechang County was called Longshui, and the county below was called Longshui. Lingwu to Shaoguan in Song Dynasty was called Longshui, and it was renamed Qinshui after Yuan and Ming Dynasties. In the Qing Dynasty, they were collectively called Wujiang and Wushui. The length of the city is112.8km.. China's watershed area is 242 1 km2, with an average slope of 0.9 1‰.

In Ruyuan County, Wuyang Temple and Changlai Town in Lechang County of Guangdong Province entered Yangxi, Dongan, Juncun, Daba and Guitou Market in Guitou Town of Ruyuan County, and left Tangtou Village and flowed into Shaoguan City. Ruyuan County is 16.25 km long, with an average slope of 1.23‰ and a rainwater collection area of 749 square kilometers, accounting for 10.5% of the total basin area. The average river flow 1.54 cubic meters per second, annual runoff of 5.23 billion cubic meters, natural drop of 20 meters, available drop of 7 meters, county-level hydropower reserves 1.54 million kilowatts, and recoverable amount1.20 million kilowatts.

Wujiang District, Shaoguan City (formerly Qujiang County and qujiang district) Wujiang River is located in the north of the county seat, commonly known as Xihe River, which was once called Huxi and Wuxi in history. Enter from Guitou, Ruyuan County, pass through Chongyang Town and enter Zhenjiang District. The river section in China is about 20 kilometers long. The basin area of the county is 44 1.4 square kilometers, and the river bed gradient is 0.906‰.

In Zhenjiang District of Shaoguan City (formerly under the jurisdiction of Qujiang County and qujiang district), Wujiang River is also known as Wushui and Xihe River, and was called Wuxi, Sishui, Sanshui, Lake and Lechang Water in ancient times. Enter Lishi Town, Zhenjiang District via Wujiang District (formerly under the jurisdiction of qujiang district), pass Shiliting, Wu Liting and downtown, and then pass through Zhenjiang. The river basins in China are located in the urban villages such as Nanmen, Heping, Taiping Office, Shiliting, Jinfengping, Wu Liting, Jingcun, Huanggang, Lishi, Qunfeng, Shayuan, Tanghuang, Xia Yuan and Xianglang. Wujiang River is a mountainous river. The main stream of Guangdong is more than 50 kilometers from Shi Ping to Lechang Gorge. There are many mountains, canyons and beaches on both sides of the strait, and the famous 18 beaches in Jiulong are here, which is also a section of Beijiang River with good conditions for hydropower resources development.

Wujiang River bed is composed of rocks and pebbles. The upper reaches (Shiping to Linwu) are purple sand shale hilly areas, and the riverbed bends greatly with obvious slope. The middle reaches (Shiping to Lechang City) belong to mountainous rivers, with high mountains on both sides, narrow riverbed and steep slope, rapid water flow and abundant hydraulic resources. The Lechang Gorge section between Luojiadu and the urban area is also called "Nine Long Eighteen Beaches". With the development of Wujiang River, many dams have been built along the river to build hydropower stations. The sediment in Wujiang river bed increases year by year, and the width of the river bed narrows.