Geography of Shaodong County, Shaoyang City, Hunan Province

Shaodong county belongs to the hilly area in central Hunan, and it belongs to erosion landform. Hilly land accounts for 6 1. 18% of the county's total area, while mountains account for 2 1.69%, and plains are mostly valley plains, accounting for only 10.85%. The terrain rises from north to south, inclines to the middle, and the middle rises to the east and west in a ladder shape, becoming a branch of the three major water systems in China-Yinjiatangling. Shaodong County is located in the transition zone between Xuefeng Mountain and Nanling Mountain System, with hills and valleys all over the territory, accompanied by low hills, small plains and several small basins. The terrain is the uplift of the north and south mountains and the uplift of the east and west in the middle. There are three major surface water systems in Shaodong County: Shaoshui, steamed water and measured water, which flow eastward into Xiangjiang River and Shaoshui flows westward into Zijiang River. The total annual runoff is 2.487 billion cubic meters. Shaoshui originates in Nanchong, the northwest foot of Huilongfeng in Shuangfeng Township, Shaodong County, passes through Zhouguanqiao, Liangshitang, Niumashi and Yunshuipu Township, and joins Zijiang River on the right bank of Jiangyan Bridge in Shaoyang City. The total length is 1 12km, the drainage area in China is 1965km2, and the average river gradient is 0.79‰. The larger tributaries are Tuojiang River, Xiyang River and Tanjiang River. Tuojiang River originates from Youjiaping in Shaoyang County, flows through Cunninghamia lanceolata Bridge, Huangjiaba Reservoir and Xiantuoqiao Township in Shaodong County, and flows into Shaoshui from the left bank of Xiaojiacun. Xiyang River originates from Yueping Peak in Xinshao County, flows through Taiji Temple, Tanfu, Chenxiang and Fanjiashan Town in Shaodong County, and flows into Shaoshui from the right bank of Niumashi. Tanjiang River originates from the southern foot of Jianmuling in Dong 'an County, enters the city at jiepai Bridge in Wufengpu Town, Shaoyang County, passes through Wufengpu, Zhonghe, Xiahuaqiao, Guzhou Township and Tanjiang Township in the suburbs, and flows into Shaoshui from the left bank at Shuangjiangkou. The specific location of the source of steamed water is Jacky Village, Jianjialong Township, Shaodong County. It flows through Jianjialong Township, Yejiping Township, Lingguandian Town, Shetianqiao Town, Shuidongjiang Town, Jin Lan Town and Daiyingling Town of Hengyang County, and finally flows into Xiangjiang River.