General situation of Taohe main stream

Taohe River, located in the south of Gansu Province, China, is the largest tributary of the upper reaches of the Yellow River. Its main stream originated in Ledang, at the foot of the westward sloping mountain in Hainan Mongolian Autonomous County, Qinghai Province, and flowed into the province at the foot of the westward sloping mountain in luqu, Gansu Province. Taohe River flows through Luqu, Lintan County, Zhuoni, Min County and Lintao County, and flows into the Yellow River upstream of Liujiaxia Reservoir Dam in Yongjing County. The main rivers are 673 kilometers long and the basin area is 25,527 square kilometers. The elevation of the source of Taohe River is 4260m, the elevation of the estuary is 1629m and the drop is 2631m.. The average annual flow of Goumencun Station is 172 cubic meters per second, and the annual runoff is 5.3 billion cubic meters (Hongqi Hydrological Station). The total amount of self-produced water resources is 4.72 billion cubic meters. May ~ 65438+10 accounts for more than 75%, which provides abundant water resources for central Gansu.

The main stream of Taohe River flows from the source of the river from west to east to Min County, and then it is blocked, and then flows sharply to the north and west, in the shape of a recumbent L-shape. According to natural characteristics, the main stream is divided into three sections: the upper reaches above Xizhai in Min County, with a length of 384 kilometers and an average gradient of 4.9‰. The river valley is wide, the terrain is flat, the grasslands on both sides are widely distributed, the water flow is stable, the water is clear to the bottom, the cutting erosion is weak, and the river channel is relatively stable; The middle reaches from Cisse to Haidian Gorge (the return estuary) in Lintao County, with a river length of 148km and an average gradient of 2.8‰. Due to the influence of geological structure, the river folds are serious, and there are many canyons, forests and grasslands on both banks. The vegetation is good, the water conservation ability is strong, the flood is small, the sediment concentration is low, the river flow is gradually increasing, the water flow is fast, and the hydraulic resources are rich. Below Haidian Gorge is the downstream, with the river length 1, 4 1km, with an average gradient of 2.5‰. Wide valley beach, loess hills on both sides, poor vegetation and serious soil erosion.

The main rivers in Taohe River system include Taohe River main stream, Zhou Ke tributary, Cai Ke tributary, Kuohqu tributary, Bola tributary, Chebagou tributary, Chekou tributary, Dayugou tributary, Diecanggou tributary, Yang Sha tributary, Mu Ye tributary, Manba tributary, Sancha tributary, Dongyugou tributary, Dabi tributary and Guangtong tributary.