There is a dendritic water system between the main stream and tributaries of Huangshui River. Wandering water flows out of the Grand Canyon, through Ledu County, Laoya Gorge, Minhe County, to the confluence of Minhe Xiachuankou and Datong River, and then flows southeast to Minhe Shahewan Village along the Gansu-Qinghai provincial boundary. This section flows through the narrow valley between Qingshiling and Laji Mountain, and the river course is tortuous. The riverbed is generally 100-200m, and Laoyaxia section is only about 30m. Except for Datong River, the tributaries in this section are short, and the longest tributary Yinshenggou is only 5 1.9km, and the main stream and tributaries are in a pinnate water system. Basin area, river length, where is the water level injected into the river name? Name or place name of hydrological station in basic section or location of catchment area (square kilometers) River length (kilometers) Average river gradient (one thousandth) comes from Hongshanzhuang, Haiyan, Huangshui River. 7 15 78.2 7. 18, Shuitiaogoukou, Dongxia Township, Shiyazhuang, Baohutushan. 3083126.888. Zamalong, Huangyuan County 3338 638 Minhe County 15342 299.6 5.30 Yaoshui River Huangjishui Dongjiazhuang (3) Dongjiazhuang Suburb, Huangyuan County 363 50.6 19.5 Yaoshui Estuary, Dongjiazhuang Suburb, Qingyang Mountain, Huangyuan County 639 52.2 18.9 Xinachuan Huangshui Xinachuan (Xinachuan) 809 67.9 17 Ulan Hada Mountain in haiyan county, also known as southwest Kawaguchi of Daling Ganshui River in Xining City, 957 82. 1 14.4 Beichuan Hehuang Shuiqiaotou (5) Downstream of Qiaotou Town in Datong County190m, 27741. .5 The source of haiyan county Kexit Mountain is Baoku River, Beichuan Estuary, Xiachaoyang in Xining City, 3371/Heilin River, Beichuan River, Heilin (2) Woma Village, Qinglin Township, Datong County, 28 1 37.0 26. 1 Wu Qili, Datong County is Huangshui River. Zhuangzi1270.12.9/1kloc-0/270.12.9 The source of Dawocang Mountain in Huzhu County is Fujiazhai 165 in the Shatangchuan estuary of Nanmenxia River. 438+01571.812.8 The source of Liejian Mountain in Ledu County is Shuimoying 48151.930./kloc-. Huangshui Garide Garide in Lemo Township, Qilian County 4576 188.4 3.55 Tianjun Tolai Palm, also known as White Tiger Temple in Zihaomenhe, Gongba Bay, Lemo Township, Qilian County 5435 2 18.8 2.36 Garidatan Village, Qingshizui Township, Menyuan County, Garidatan County 3535 2655438+08.36 Xiangtang, Garidatan County. It became famous after Datong was built by the river in the Song Dynasty. Judging from the length and flow, Datong River is actually the source of Huangshui River. Originated in Jimuling of Shagaolin between Tuolai Nanshan and Datong Mountain in the eastern part of Qilian Mountain in Muli, Haixi Prefecture. It flows eastward through Qilian, Menyuan Basin, Liancheng and Yaojie in Gansu, passes through Nanshan-Lenglongling and Datong-Dabanshan Corridor, and flows into Huangshui in Minhe County, with a total length of 554 kilometers. Datong River system belongs to the Yellow River Basin, located at the northeast edge of Qinghai-Tibet Plateau, between 36 30' and 38 25' north latitude and between 98 30' and 65 438+003 65 438+05' east longitude, and is the largest first-class tributary of Huangshui River. Datong River originates from Tole Nanshan in Tianjun County, Qinghai Province, flows through Gangcha, Qilian, Haiyan, Menyuan, Huzhu and Ledu counties in Qinghai Province from northwest to southeast, and finally flows into Huangshui near Xiangtang Village in Minhe County, Qinghai Province, and then into the Yellow River. The shape of the washbasin is a long and narrow strip. It is adjacent to Heihe River and Shifeng River basins in the two river corridors in the north, Datong Mountain, Dabanshan Mountain, Qinghai Lake system and Huangshui River mainstream areas in the south, and Pandaoling and Zhuanglang River basins in the east. The total length of the main stream is 560.7 kilometers, of which the length of rivers in Qinghai Province is 464.42 kilometers, and the average gradient of the main channel is 4.65%. The total basin area is 15 130 square kilometers.