The weather in Mianzhu for a week

Longmen Mountain is in the northwest of Mianzhu, and Chengdu Plain is in the southeast. The terrain is high in the northwest and low in the southeast. It gradually inclines from northwest to southeast, and the average altitude drops from 4405 meters to 504 meters. It has the characteristics of "six mountains, one water and three fields". Northwest mountainous area is the birthplace of Chinese rivers. There are many tributaries, with a river depth of 500- 1000 meters, narrow riverbed and steep valley; The southeast plain is endless and fertile, which is the main agricultural area of the city. The topography of the city is roughly divided into two parts: mountains and plains, and the boundaries between mountains and plains are clear. There are three types of mountainous areas: high, medium and low, covering an area of 648.55 square kilometers, accounting for 52.08% of the total land area of the city. The plain area is 596.75 square kilometers, accounting for 47.92% of the city's total land area.

climate

Mianzhu belongs to the subtropical humid climate zone in Sichuan Basin, with mild climate, abundant precipitation and four distinct seasons. The continental monsoon climate has obvious characteristics, such as no heat in summer, no severe cold in winter, long frost-free period, frequent cold air activities in spring, unstable temperature rise, frequent droughts in spring and summer, heavy rains in midsummer, floods in autumn and rainy weather. The annual average temperature is 15.7℃, and the accumulated temperature of 10.0℃ is 5000 ~ 5300 ~ 6500℃ all year round; The accumulated temperature of 10.0℃ is 240~300 days throughout the year; The average temperature in Leng Yue is 4.0℃ to10.0℃; The annual extreme minimum temperature is 10.0℃ to-1.0℃ ~ 2.0℃; Dryness < 1.00 (calculated by Penman formula). The annual average precipitation 1053.2 mm, the annual maximum precipitation14210.4 mm, and the minimum precipitation 608.7 mm, and the seasonal distribution of precipitation is extremely uneven. The average sunshine hours for many years are 10 1 1.3 hours, with the maximum value of 1 178.0 hours and the minimum value of 802.7 hours. The average frost-free period for years is 285 days.

water resource

Mianzhu is located in the upper reaches of Tuojiang River, with an average annual precipitation of 65,438+0,086.4 mm. Shi Ting and Mianyuan flow through the plain. The city's total water resources are 65.438+0.7 billion cubic meters, and the total available water resources are 900 million cubic meters. The exploitable amount of groundwater is 65.438+0.10.30 billion cubic meters, which meets the water supply requirements. The city's hydropower development capacity is 65,000 kilowatts, and small hydropower has been built. Agricultural irrigation conditions are good. Dujiangyan People's Canal and Hongyan Canal run through the whole territory, and Mianyuan Heguan Songbonian Hub blocks the river for water. There are 2 small (1) and (2) reservoirs in the city, with 65,438 main canals, branch canals and bucket canals, with a length of 1373.4km, forming a storage, diversion and lifting pipe network. The city has built 82.44 kilometers of dikes, including 60.44 kilometers of standard dikes, which can promote benefits and reduce disasters, and can develop floodplain land 1.68 million mu.