Geographical environment of Qushui County
Qushui County is located in the middle reaches of Yarlung Zangbo River, with low terrain. One vein of Nyainqentanglha Mountain winds northward, and seven streams wind 5-20km on the south slope, flowing into Lhasa River and Yarlung Zangbo River. Gullies are from high to low, and from narrow to wide, forming alluvial fan slopes of different sizes. The lowest elevation of the valley is 350 1 m, and the highest elevation of the mountain peak is 5895 m.
topography
The whole terrain is slightly higher from east to west, and the intersection of Lhasa River and Yarlung Zangbo River in the middle is lower. The mountains of Nyainqentanglha Mountain meander in the north. Nyainqentanglha Mountain is located in the middle of Tibet Plateau, about 600 kilometers long from east to west. It is bordered by Gangku Kasai in the west, extends to Boshula Ridge in Hengduan Mountains in the southeast, and slightly protrudes to the north in the middle. It is the watershed between the Yarlung Zangbo River and the Nu River, and divides Xizang Autonomous Region into three regions: northern Tibet, southern Tibet and southeastern Tibet. Lhasa River and Yarlung Zangbo River flow through Qushui County.
Lassa R.
Lhasa River originates from Pengcuola Kongmagou at the southern foot of Nyainqentanglha Mountain, flows through Naqu, Dangxiong, Linzhou, Mozhugongka, Dazi, Chengguan and Duilong Deqing, and reaches Qushui County. It is a large tributary of the middle reaches of the Yarlung Zangbo River, with a total length of 495.2 kilometers and a drainage area of 3 1.760 square kilometers. The maximum flow is 2830 m3/s, the minimum flow is 20 m3/s, and the annual average flow is 287.4m3/s; It is one of the highest rivers in the world at an altitude of 5500m from the source to 358 1 m at the mouth of the river.
Yarlung Zangbo River
The Yarlung Zangbo River, like a silver dragon, originates from the snow-capped mountains on the northern slope of the middle Himalaya at an altitude of more than 5,300 meters, flows from west to east in the southern part of the Qinghai-Tibet Plateau, known as the "roof of the world", and finally leaves the country near Pasigat, renamed the Brahmaputra River, and flows into the Bay of Bengal via India and Bangladesh.