Physical geography of Beidao District

Beidao District of Tianshui City is located in the southeast of Gansu Province and Tianshui City, bordering Baoji City of Shaanxi Province in the east, Qincheng District, liangdang county and Huixian County in the south, Gangu County in the west, Qingshui County and Qin 'an County in the north. It is located at east longitude105 25 ′ ~106 43 ′, north latitude 34 06 ′~ 34 48 ′, east-west length 123 km, north-south width 50 km, and the narrowest part is less than 5 km, with a total area of 3,452 square kilometers.

North Island is a semi-humid monsoon climate in Chinese mainland, with mild climate, four distinct seasons, abundant sunshine and moderate precipitation. The average annual precipitation is 600 mm, decreasing from south to north. The average annual sunshine is 2090 hours, with an average of 5.7 hours per day, and the sunshine percentage is 47%. The sunshine varies greatly from region to region, with more mountains in the north and less forests in the southeast. The total solar radiation is 2395 ~ 2703 MJ/m2, and the frost-free period is longer than 170 days.

The North Road crosses the Yangtze River and Yellow River basins, with the Qinling Mountains as the watershed, and the Weihe River system, a tributary of the Yellow River north of Lingdao, with a watershed area of 2 180 square kilometers, accounting for 62.6% of the total area of the whole region. The Weihe River is 18 1 km long in China, and its larger tributaries are He Jie River, Hulu River, Niutou River, Dongke River and Dongcha River. Lingnan is the Jialing River system, a tributary of the Yangtze River, with a drainage area of 1.30 square kilometers, accounting for 37.4% of the total regional area. The main tributaries of Jialing River system are Hongya River, Miaohua River and Baijia River.