Lanzhou is high in the west and low in the south, and low in the northeast. The Yellow River flows from southwest to northeast, across the whole territory and across mountains, forming a beaded valley with alternating valleys and basins. The canyons include Bapan Gorge, Chaijia Gorge, Sangyuan Gorge, Daxia Gorge and Wujin Gorge. The basins include Xincheng basin, Lanzhou basin, Niwan-Ishikawa basin and Qingcheng-Shuichuan basin. There are Huangshui Valley, Zhuanglang Valley, Yuanchuan Valley and Datong Valley.
Lanzhou has a temperate continental climate. The annual average temperature is 65438 00.3℃. There is no heat in summer and no cold in winter. This is a famous summer resort. The annual average sunshine hours are 2446 hours, the frost-free period is 180 days, and the annual average precipitation is 327mm, mainly from June to September.
Extended data
Lanzhou's water resources are lower than the national average, and the Yellow River and its tributary Huangshui can meet the urban industrial and agricultural water and domestic water. Lanzhou has 960 million cubic meters of groundwater every year. The total surface water resources of river runoff is 38.4 billion cubic meters, and the total groundwater is 960 million cubic meters.
In the upper reaches of the Yellow River, 25 large and medium-sized hydropower stations can be built with Lanzhou as the center, with a total installed capacity of150,000 kilowatts. Liujiaxia, Bapanxia, Yanguoxia and Daxia hydropower stations and other hydropower stations in the neighboring areas constitute one of the largest hydropower centers in China.
By the end of 20 14, 35 kinds of deposits and occurrences at 156 have been proved in Lanzhou. There are 35 kinds of minerals in 9 categories, including nonferrous metals, precious metals, rare earths and energy minerals. Baiyin and Jinchang near Lanzhou are important producing areas of nickel, lead, zinc, rare earth and platinum group precious metals in China.
Non-metallic minerals are relatively rich, including limestone, flux dolomite, flux quartzite, ferrosilicon quartzite and refractory clay. Among them, quartzite reserves are concentrated, and the transportation reserves reach 300 million tons, which provides sufficient reserve resources for ferrosilicon industry.
Baidu encyclopedia-Lanzhou