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一、基本概况甘肃的地理位置,深居大陆内部,纬度32°13′～42°57′,南北相距约10个纬度,经度92°13′～108°46′,东西跨越16个经度.又处于青藏、黄土、蒙古三大高原的交汇地带,境内地势高亢,地形复杂.大部分地区海拔都在1000米以上.全省年平均气温从祁连山地和甘南高原的4℃以下,递增到陇南南14℃,最冷月(一月)平均气温从陇南山地0℃,陇中的黄土高原的-6℃,河西、甘南高原-10℃向祁连山、北山山地逐减到-12℃.全年无霜冻期(日最低气温在0℃以上)陇南220天,陇中180天、河西160天.除陇南部分海拔在1000米以下地区外,全省大部分地区无霜冻期短、冰冻期长、冰害严重.对小水电站的正常运行影响很大,严重的地区逼迫电站停运.
First, the basic situation Gansu’s geographic location, deep in mainland China, latitude 32 ° 13 ’~ 42 ° 57’, about 10 latitude north and south, longitude 92 ° 13 ’~ 108 ° 46’, east-west span of 16 longitude. In the intersection of Qinghai-Tibet Plateau, Loess Plateau and Mongolia plateau, the terrain in the territory is high-pitched and the terrain is complicated, with the altitude over 1,000 meters in most areas.The annual average temperature in the province increases from below 4 ℃ in Qilian Mountains and Gannan Plateau to 30 in Longnan 14 ℃, the coldest month (January) the average temperature from Longnan mountain 0 ℃, Longzhong loess plateau -6 ℃, Hexi, Gannan plateau -10 ℃ to Qilian Mountains, Beishan mountain reduced to -12 ℃. Frost period (day minimum temperature above 0 ℃) Longnan 220 days, Longzhong 180 days, Hexi 160 days.In addition to Longnan some elevation below 1000 meters in most areas of the province without frost-free period, the ice period is long, ice Serious harm to the normal operation of small hydropower stations have a great impact on the power station in a serious area outage.