What is the average altitude in Xunyang County, Ankang City?

It belongs to the north subtropical humid climate process area, with an average elevation of 920 meters.

geographical environment

location

Xunyang county is located in the southeast of Shaanxi province, between east longitude 103 58'~ 109 48' and north latitude 32 29' ~ 3313'. In the east, it is bounded by the watershed between the middle and lower reaches of Xianhe River and Danan River (Yunxi County), and the watershed between the upper reaches of Lvhe River and Lengshui River (Baihe County). From north to south, it is adjacent to Yunxi County of Hubei Province and Baihe County of Shaanxi Province in turn. In the south, it is bounded by the Hanjiashan-Tongqianguan line and the watershed between Shenda River and Ruhe River and Guanhe River (Pingli County), and it borders Zhushan County of Hubei Province, Zhuxi County of Shaanxi Province and Pingli County in turn from east to west. In the west, it is bounded by the line from Wangmangshan to Baojiashan, adjacent to Ankang City, Shaanxi Province; North from west to east, bounded by the watershed of Mao Ping, Luojiahe, Shuhe and Xianhe (Yunxi County), it is connected with Zhen 'an County of Shaanxi Province and Yunxi County of Hubei Province respectively. This map looks like an irregular triangle. It is 82 meters long from north to south, 79 kilometers wide from east to west (horizontal distance) and about 390 kilometers in circumference. The total area of Xunyang County is 3554 square kilometers, accounting for 10.95438+0% of the total area of Ankang.

topography

Xunyang County is located in Qinba Mountain area, and the Hanjiang River Valley runs through the central part from west to east, which naturally divides the county into two natural areas, north and south. The terrain is high in the north and south and low in the middle. The north-south topographic profile is V-shaped, with an altitude of185 ~ 2358.4m. The north of the Hanjiang River belongs to the southern slope of Qinling Mountain and is a part of the Qinling sub-belt of the Qinling banded structural belt. Except Wangmang Mountain-Baojia Mountain, all the other mountainous areas are east-west, with a high center and a low periphery, covering an area of 228 1.7 square kilometers, accounting for 64.2% of the total area of Xunyang County. The south of Hanjiang River belongs to the arc structural edge of Daba Mountain in Qinling belt-shaped structural belt. Most of the mountains are to the west, slightly lower than the north of the Han River, higher in the east and south, and lower in the northwest, with an area of 1272.3 square kilometers, accounting for 35.8% of the total area of Xunyang County. Geomorphological features are: mainly in Zhongshan, mainly in low mountains, hills and river valleys. The area is full of mountains and valleys.

climate

Xunyang is located in the northern edge of the subtropical zone, with a Qinling barrier, which blocks the cold air going south and the warm air flowing back to the Hanjiang River Valley. The territory has a warm and humid climate with four distinct seasons. From 1989 to 2009, the average temperature increased by 0.5℃, especially in autumn and winter. The number of days in summer increased by 23 days, and decreased by 7~ 12 days in spring and autumn. The average annual precipitation decreased by 90.6 mm.

From March to May in spring, the weather in spring is changeable and uneven, and cold air often invades, which makes the daily average temperature drop obviously. The average temperature dropped by 6℃ (or above) four times in 24 hours. There is less precipitation in spring, accounting for 22% of the annual precipitation. In dry years, droughts often occur before March. There is a saying that "Spring rain is as expensive as oil". It seldom rains in rainy years. The total sunshine hours are only more than those in autumn.

In summer, June to August, July and August are hot periods all year round. From mid-July to mid-August, the high temperature ≥35℃ lasts as many as 10 days, and the extreme maximum temperature is 43. 1℃. There is a lot of precipitation in summer, and the rainfall accounts for 5 1% of the annual total. Maximum precipitation of a rainstorm: June 1 17. 1mm, July 123. 1mm, August105.7mm. The summer drought is obvious from July to August, and the severe summer drought period can be as long as 55 days. The sunshine time in summer is longer than that in other seasons.

In autumn from September to June165438+1October, the temperature drops obviously, and the lowest temperature is below 0℃ as early as June165438+1October 14. September is the second peak month of annual precipitation, accounting for 24% of the total, and it is also a month with great changes in precipitation over the years. It is rainy in autumn. From September 30th to June 7th, 10 is a rainy period, which often leads to landslides. There are fewer sunny days in autumn, and the sunshine hours are reduced, and the total hours are slightly more than those in winter.

Winter lasts from 65438+February to February of the following year. Winter is the coldest period of the year. The lowest temperature in February 2,65438 was below 0℃, and it rose to above 0℃ on March 4 of the following year. The minimum temperature < 0℃ is 39 days. After winter, the snowfall gradually increases, and the snowfall period is 1 1.30 to March 1.8. The depth of snow is generally 2~4 cm, and the maximum thickness of snow is 14 cm. In the north and south mountain areas, the snowfall usually lasts from 10 to April of the following year, and the thickness of the snow can reach 30 cm, and the snow cannot melt for several months. Winter precipitation is small and unstable, which is prone to drought. The total sunshine hours in winter are the least in a year.

With the increase of topography, the temperature in the middle and high mountains in China decreases, the number of days in summer decreases and the number of days in winter increases. There is basically no summer in Yangshan Mountain at an altitude of 1700 meters, and the winter is as long as 223 days.