Weather in Yanjiang District of Ziyang

In the middle and west of hilly area of Sichuan basin, there is a land with an area of 7962.56 square kilometers, which is Ziyang area, one of the birthplaces of ancient civilization in the land of abundance. The world-famous third human skull fossil in China was unearthed here and was named "Ziyang Man". According to this, it can be proved that 35,000 years ago, human beings have thrived on this ancient land and worked hard to open up the ancient civilization of Tianfu. Generation after generation, Ziyang, with a population of 4.88 million, has blazed new trails in the ancient land, created brand-new material civilization and spiritual civilization, and written a more magnificent new chapter. 1In February 1998, with the approval of the State Council, ziyang and jianyang city (both county-level cities), Anyue County and Lezhi County were placed under the jurisdiction of Neijiang City, and Ziyang District was formally established on April 29 of the same year. From June, 5438 to February, 2000, it was set as the youngest prefecture-level city in Sichuan Province, with jurisdiction over Yanjiang District, Anyue County and Lezhi County, and hosting jianyang city, with an area of 7,962.56 square kilometers. There are 4 sub-district offices in the city, 17 1 township, 28 15 villages and1/0/5 community neighborhood committees. At the end of 2008, the permanent population of the city was 4.233 million, and the urbanization rate reached 29.7%. Cultivated land is 4 1.8 million mu, with an average elevation of 400 meters. It belongs to shallow hilly landform and is a typical hilly agricultural city. Ziyang Ziyang is located in east longitude10421'-10527' and north latitude 2915'-3017', which is in the middle of Chengdu and Chongqing. It connects Chengdu (87 kilometers apart) and Deyang in the north, Neijiang in the south, Chongqing (257 kilometers apart) and Suining in the east, and Meishan in the west. There are chengdu-chongqing railway, Chengdu-Chongqing Expressway, National Highway 3 18, 3 19, 32 1 and other backbone traffic trunk lines, and the West Sichuan Ring Road 18. It constitutes a developed land and water transportation network. Transportation and travel are convenient and fast. Ziyang has always been a traffic artery connecting Chengdu and Chongqing and an important commodity distribution center. The location advantage is very prominent, which is closely connected with the important economic belt of Chengdu and bears the radiation function of the development of Sichuan-Chongqing ties. Ziyang is an ecological forest reserve in the middle and upper reaches of the Yangtze River, with a forest coverage rate of 33%. The annual average temperature 17℃, the annual average rainfall 1 100 mm, the annual sunshine hours 1300 hours, and the annual average frost-free period is as long as 300 days. Ziyang has a mild and humid climate, a long frost-free period and abundant rainfall. With fertile soil, strong suitability for planting, rich agricultural resources and solid foundation, it is the main grain producing area and key cash crop producing area in Sichuan, and also a large-scale commodity grain base in China. There are three national grain bases, two national pig bases, a national lemon base 1, a national peanut base 1 and two provincial sericulture bases. Industrialization has become one of the main ways to increase farmers' income. A large number of ecological construction projects with the Yangtze River shelterbelt system, returning farmland to forests, Chengdu-Chongqing Expressway Green Economic Corridor and Tuojiang River comprehensive improvement as the main contents have been started and achieved results, laying a solid foundation for the sustainable economic development of the new district. Ziyang area has concentrated industrial categories and outstanding characteristics. There are 65,438+2,000 industrial enterprises in China, forming five pillar industries: machinery manufacturing, chemical industry, food, medicine and silk textile. It has formed an industrial system with a certain scale and complete categories. The industrial economy with Ziyang Diesel Locomotive Factory, Yangmahe Bridge Factory and Sichuan Rubber Factory as the main body has great development potential and competitiveness. From 65438 to 0999, the gross national product of the whole region was 137 billion yuan, an increase of 6. 1% over 1998. Ziyang is rich in cultural tourism resources, with 52 scenic spots and 325 scenic spots. There are 94 key cultural relics protection units, including national 1, provincial 12, prefecture (city) 1 and 80 counties (cities). With Longquan Lake, Sancha Lake, Anyue Stone Carvings and Chen Yi's former residence as the main features, Ziyang has become the starting point of Sichuan East Ring Road (Marshal's hometown tour) and the end point of South Ring Road, becoming a tourist and leisure resort in central Sichuan. In particular, Anyue stone carvings are "ancient, diverse, refined and beautiful", which have high cultural relics value, profound cultural and artistic connotation and ornamental research value. Its reclining Buddha statue in the Tang Dynasty is 23 meters long, ranking first in the world, and its 400,000-word stone carving is rare in the world, which is a treasure with great characteristics and research value. Purple bamboo Guanyin in Piludong is known as "Venus of the East", which is yearned for and appreciated by Chinese and foreign tourists. Mr. Wang Chaowen, a famous aesthetic theorist, commented that Anyue stone carving is "a link between Dunhuang and Dazu" and "worthy of being another treasure house of ancient stone carving in China". Anyue stone carvings occupy a very high position in the national caves. Together with Sancha Lake in Jianyang, "Watertown Scenery" in Longquan Lake and "Celebrity Hometown" in Chen Yi's former residence, it is a famous brand and highlight of our city's tourism development. In order to promote the construction of Chengdu National Experimental Zone for Urban and Rural Comprehensive Reform, from 00: 00, 20 10, 1, the communication between Chengdu, Meishan and Ziyang was cancelled, the fixed telephone was adjusted to the interval call fee, the mobile phone was adjusted to the local call fee, and the Ziyang area number was merged from 0832 to 028. At the same time, the local call charges between Ziyang and Neijiang were adjusted to long-distance call charges.

Ziyang communications

highway

Ziyang is adjacent to Chongqing, Chengdu, Meishan, Neijiang, Suining and Deyang. Tianfu No.1 Expressway-Chengyu Expressway passes through the northern suburb of Ziyang, and will soon build Sui (Ning)-Zi (Yang) Inner (Jiang) Expressway, Sui (Ning)-Zi (Yang)-Mei (Shan) Expressway, Chengyu Expressway (Chengdu-Chongqing double track, Chengyu Expressway) and Sichuan-Hubei Expressway; 3 18 National Highway (Shanghai to Lhasa), 3 19 National Highway (Xiamen to Chengdu), 32 1 National Highway (Guangzhou to Chengdu), West Sichuan Ring Road and 106 Provincial Highway also pass through the territory, and the mileage of highways in the city has reached 3,394 kilometers.

railway

Chengdu-chongqing railway leads eastward from Chengdu Railway Station, passes through jianyang city and Yanjiang District, and passes through Ziyang. There are several passenger and freight stations in Ziyang, which undertake the main transportation services of the city. The planning results of Chengdu-Chongqing intercity railway (chengdu-chongqing railway double track) have been announced, and the route direction is: Chengdu-Ziyang-Zizhong-Neijiang-Rongchang-Yongchuan-Chongqing. That is, the southern line plan was finally approved by the National Development and Reform Commission. As a dedicated passenger line, this line will only send passenger trains, and there are two departure modes: stopping along the line and Chengdu-Chongqing direct. The departure interval is 3-5 minutes. (The route of the northern line scheme is: Chengdu-Jianyang-Anyue-Dazu-Bishan-Chongqing, which is about 279 kilometers long, and Chengdu-Chongqing access can be realized in about 50 minutes, with an estimated investment of 30 billion yuan).

Ziyang topography

Ziyang is located in the middle Sichuan fold belt of Huaxia Sichuan subsidence belt, between the hemispherical structure of Longnvsi and the Weiyuan radiation structure, with the west high and the east low. According to the landform, the whole city can be divided into three types: low mountains, hills and river alluvial dams. Among them, hills account for over 90% of the total area. The terrain is mainly the influence zone of the annular structure of Longnv Hemisphere, with simple structure and gentle strata. The exposed strata are Quaternary Holocene strata, Jurassic Penglai Town Formation strata, Jurassic Suining Formation strata and Jurassic Shaximiao Formation strata, and the soil is mainly purple clay. Generally, the altitude is between 300 and 550 meters. The highest point of the low mountain is in Chang Song Temple in Longquan Mountain (elevation1059m), and the lowest point of the river dam is in Qiongjiang River boundary of Xiajiaba (elevation 247m).

Ziyang hydrology

Tuojiang River, which originated at the foot of Jiuding Mountain in northwest Sichuan Plateau, enters from Hongyuan Town, jianyang city, flows to the southeast, and leaves in Wuchuang Town, Ziyang, bordering Neijiang, winding eastward. Tuojiang River flows through Hongyuan, Lingxian, Zhuangxi, Ma Yang, Pingwo, Shizhong, Shiqiao, Chengjian, Dongxi, Xinshi, Pingquan, Longfei, Laojun, Linjiang, Baohe, Baotai, Jiang Yan, Songtao, Nanjin, Zhong Yi and Wu Guang. Due to the development of river network, Tuohe River and Fuhe River have 1 10 tributaries, and there are 1 10 rivers with a basin area of more than 100 square kilometers. There are 8 small rivers with an area of 50 square kilometers-100 square kilometers. There are more than 40 short streams, almost all of which originate from hills. The riverbed is flat and wide, the terrain is shallow, the drop is small, the water flow is gentle and the shore is open, which is a typical water network in hilly areas.

Ziyang climate

Ziyang has four distinct seasons, evergreen, early spring, long summer, short autumn and warm winter; There are many thunderstorms in summer but not very hot, and there is little frost and snow in winter without severe cold; Rainfall is relatively abundant but unevenly distributed in time and space, which is often damaged by drought and flood disasters; Rain in early summer affects the harvest of summer grain; Mid-autumn rain, resulting in a poor harvest in autumn; Summer is gone, cold wave activities are frequent, and sometimes there will be low temperature chilling injury; Occasional hail in spring often leads to local disasters. Cloudy and sunny all year round, with high air humidity and small temperature difference between day and night; The average wind speed is small, and there are few windy days. Specifically, the annual average temperature in Ziyang county is about 65438 07℃; The annual precipitation is about 950 mm; The annual sunshine is about 1250 hours; The hottest month is August, and the average temperature is about 26.5℃. The Leng Yue is 65438+ 10 month, and the average temperature is about 6.5℃. The extreme maximum temperature is 40.2℃; Extreme minimum temperature -5.4℃. There are many factors that affect the above climate characteristics, among which solar radiation, geographical location and atmospheric circulation are the most influential. In winter, the direct point of the sun is in the south, and the radiation intensity in the northern hemisphere is weakened. Under the action of pressure gradient force, westerly airflow prevails in high altitude, forming winter wind. At this time, cold air often goes south to affect Ziyang. However, due to the blocking or sinking of mountains in the northern margin of the basin, the cold air denaturation and other reasons, Ziyang's winter climate is dry and rainy, warm in winter and early in spring, with little frost and snow. In summer, the direct point of the sun is south, the radiation intensity in the northern hemisphere increases, the south side of the Qinghai-Tibet Plateau is occupied by low-latitude high-altitude winds, and the subtropical high in the North Pacific Ocean strengthens. Affected by the warm and humid air current in the Southern Ocean, the rainy season in Ziyang began. As the subtropical high extends inland, the Indian low extends northward, and the southwest airflow in front of it brings a lot of water vapor. The western Pacific subtropical high extends northward, and its ridge line moves between 25-32 degrees north latitude. Ziyang is within its influence, especially the 588 line on the edge of the subtropical high swings back and forth over Ziyang. At this time, if the subtropical high extends westward, it can control the sky over Ziyang or the eastern part of Ziyang, which often leads to high temperature, sunny and hot weather and summer drought. If the subtropical high weakens or moves eastward, when there is cold air, it will form thunderstorm weather and even flood after continuous heavy rain. In spring, the direct point of the sun moves northward, the center of atmospheric activity in the southern ocean strengthens, and the cold air force in the mainland gradually weakens. Due to the change of cold and warm air mass intensity, Ziyang warm current and cold wave weather appear alternately; If cold air flows back from east to south under the influence of Qinling Mountains, it will be rainy. In addition, due to the instability of cold, warm, dry and wet conditions, the start time of rainy season in Ziyang changed greatly, resulting in summer drought. In autumn, the direct point of the sun in the northern hemisphere moves southward, the intensity of solar radiation weakens, the atmospheric activity center in the north is established and gradually strengthened southward, the subtropical high in the south recedes southward, and the convergence zone of the north and south branches on the east side of the Qinghai-Tibet Plateau is located in the Sichuan basin, which leads to the unstable intersection of cold and warm air currents, resulting in more autumn rain, less sunshine and great changes in the termination period of heavy rain in Ziyang. As far as the basin climate is concerned, Ziyang also has the characteristics of north-south and east-west climate transition zones. In China, Longquan Mountain in the northwest is generally 600- 1000 meters above sea level, which is 300-500 meters higher than that in hilly areas. Its air subsidence, temperature increase and humidity decrease also have certain effects on Ziyang climate. For example, the drought frequency in winter, spring and Xia San in Jianyang is as high as 90%, 75% and 75% respectively, which is obviously higher than other counties.

Ziyang history

Ziyang has a long history and is an important birthplace of human civilization. According to 195 1, the human skull fossils excavated at pier 1 in Jiuqu River, west of ziyang, were identified as the late Paleolithic period, with a history of more than 35,000 years, and were named as "Ziyang people" in the history of human development by China Academy of Sciences. Jiuqu River is called Mother River by Ziyang people. Ziyang County was founded in the sixth year of Jianyuan (BC 135), and it was named Ziyang because it was located in the north of Zishui (Tuojiang). The establishment of state/county in Ziyang began in the second year of Wucheng, Ming Di in the Northern Zhou Dynasty (AD 560), and the state, county and county governments were all located in Jiangyan Town, ziyang. From the Tang, Song, Yuan, Ming and Qing Dynasties to the early years of the Republic of China, Ziyang was ruled by several counties. 1On February 26th, 1998, the State Council approved (Guo Han [1998]15): adjust the administrative divisions of Neijiang City, set up Ziyang District, and put Anyue and Lezhi counties in Neijiang City, Ziyang and Jianyang cities (counties) under the jurisdiction of Ziyang District. The regional administrative office is located in Jiangyan Town, ziyang. On June 14, 2000, the State Council approved (1) the revocation of Ziyang area and county-level Ziyang and the establishment of prefecture-level Ziyang. The Municipal People's Government is located in the newly established Yanjiang District. (2) Set up Yanjiang District in Ziyang, taking the former county-level administrative area of Ziyang as the administrative area of Yanjiang District. Jiangyan Town People's Government. (3) Ziyang governs Anyue County, Lezhi County and the newly established Yanjiang District in the former Ziyang area. Jianyang city, the former Ziyang area, is managed by the prefecture-level Ziyang.