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Physical Geography
updated on :2016-06-21 16:52

Located in the middle of Jiangsu, Taizhou is at the northern latitude from 32°01'57" to 33°10'59" and the east longitude from 119°38'21" to 120°32'20". It is close to the Yangtze River in the south, adjoins Yancheng in the north, neighbors Nantong in the east and connects Yangzhou in the west. Except one independent massif in Jingjiang, the rest in the whole city are all alluvial plains of the 2 major river systems, the Yangtze River and the Huai River. The terrain distributes in direction of middle-low and north-south high. The true height of areas along the Yangtze River in the south is 2 meters to 5 meters in general; that of high sand areas in the middle is 5 meters to 7 meters in general; and that of Lixiahe area in the north is 1.5 meters to 5 meters. The whole city covers a total area of 5,787.26 square kilometers, of which land area occupies 77.85% and water area occupies 22.15%. The area of its downtown is 1,567.13 square kilometers.

 

There is one independent massif in Jingjiang, Jiangjiang Gu Hill. Situated in Gushan Town 5 to 6 kilometers away from north of urban area of Jingjiang, the hill has an altitude of 55.6 meters and perimeter of 1.5 kilometers, covers an area of 50,000 square meters, and is one of the extension hills of Zhejiang’s Tianmu Mountain extending northeast. Though it is not as elegant as Big and Small Gu Mountains by Poyang Lake, as pretty as Gu Mountain in Zhaoqing of Guangdong and as charming as Gu Mountain by West Lake of Hangzhou, it is a genuine lonely hill, as it is the only hill north of the Yangtze River, above Nantong, under Nanjing and in the great plain of North Jiangsu. For the reason, the hill owns great reputation.

 

Within the territory of Taizhou, river networks are densely covered, and vertically and horizontally intertwined. In the north region, the terrain is low-lying; water system takes the shape to heart, and concentrates from all rounds to low place; and lakes here are distributed more.

 

 

Watershed of the Yangtze River and the Huai River traverses the city in middle part from west to east, and rivers within the territory roughly are bordered by Tongyang Highway, while rivers in north of the highway belong to river system of the Huai River and others in south of the river belong to river system of the Yangtze River. Customarily, people call old Tongyang Canal belonging to river system of the Yangtze River and rivers connecting with it as upper rivers and new Tongyang Canal belonging to river system of the Huai River and rivers connecting with it as lower rivers. At high water level, the water level of upper rivers is about 1.2 meters higher than that of lower rivers, and the average water head is 0.9 meters.

 

Taizhou is in humid climate zone of northern subtropical region, and, influenced by monsoon circulation, possesses obvious monsoon characteristics. With four distinctive seasons, it is high-temperature and rainy in summer, mild and rainless in winter, and characterized by long forest-free season, abundant heat quantity, plentiful rainfall, rain and heat during the same period and others.

 

The highest air temperature falls on July and the lowest falls on January here. The temperature difference in north and south of Taizhou in winter and summer is not very big, and the annual average air temperature is between 14.4℃ to 15.1℃. Its annual average precipitation is 1,037.7 millimeters, and the number of rainy days is 113. However, influenced by monsoon, the city’s rainfall variability is relatively bigger, and there exists difference in southern and northern territories. Its temperature zone belongs to subtropical zone, and its dry-wet region belongs to humid region.

 

Generally, Taizhou enters spring at the end of March and the beginning of April, enters summer in early and middle-June, enters autumn in mid-September, and enters winter in mid-November. Roughly, winter lasts for over 4 months, summer over 3 months, and spring and autumn over 2 months each every year here.

 

Under normal circumstances, its climatic characteristics of 4 seasons are relatively obvious. Because of frequent cold air activities in winter, the city is easily hit by cold wave. During cold front passage (namely northern cold air spreads to the south), the air temperature of the whole city generally drops; air pressure rises; and sometimes strong wind, rain and snow, frost and other weather phenomena appear. After cold front passage, the weather clears up and forms the weather variation procedure of cold and warm alternation of 3 days are cold and the next 4 days are warm. If severe cold air breaks out and heads down south (namely winter wind intense effect), the air temperature suddenly drops by over 10℃ within 48 hours, which can be called as cold wave weather. Cold wave is the city’s main meteorological disaster in winter half year. When cold wave comes, acute temperature drop will happen, and sometimes strong wind, great snow, freeze injury and other disastrous weather will appear, which will cause serious harm to agricultural production, water and land transportation, municipal construction, people’s life and others.

 

The weather of the city in spring is changeable. In the season, cold and warm air masses mutually contend, precess and regress, so the weather is sometimes cold, sometimes warm, sometimes sunny and sometimes rainy. As the saying goes, “Weather in spring is like face of a child, and will change three times in a day.” Spring rain is quite favorable to green returning and growth of wheat, barley, naked barley, oilseed rape and other winter crops as well as to in-time seeding and germination of spring-sown crops, truly indicating that rain in spring is as precious as oil.

When spring goes far away, warm-wet air current from the Pacific Ocean brings hot and rainy weather to the city, indicating summer has arrived. The 2 most typical kinds of weather here in summer is plum rain and summer drought. Early summer (from middle and late June to early and middle July) of normal year usually welcomes a run of wet weather, as cold and warm air masses match each other in strength in areas between the Yangtze River and the Huai River and form quasi-stationary front weather system. That time happens to be the season when plums of the regions south of the Yangtze River are ripe, so that is called as plum rain (also named as yellow plum rain or mould rain). An ancient poetry The whole city is rainy during plum rain season and frogs are everywhere in green grass and ponds just describes the scene of plum rain season. Plum rain weather generally lasts for about 23 days. Plum rain is conducive to growth and development of rice, corn, cotton and other crops. However, because strength and weakness degrees of summer monsoon are different, rain spell may come early or late; persistent period may be long or short; and amount of precipitation may be much or less, often causing empty plum rain, dry plum rain, waterlogged plum rain, late plum rain and other abnormal phenomena, and drought and flood disasters appear in abnormal plum rain weather most easily, which will seriously influence growth and development of crops. Midsummer after plum rain, controlled by subtropical high, experiences hot and arid weather, meaning Dog Day, also known as summer drought, has come. During the period, drought frequently happens, especially threatening high sand and soil zones where partial drought exists if it hasn’t rained for 3 days and great drought exists if it hasn’t rained for 7 days most. In midsummer, rice welcomes its growth peak season and needs much water, and other autumn crops such as corn, soybean and peanut starts flowering and setting seeds; cotton begins opening bolls; and sweet potato root tuber has come into being, all of which demand certain water supply. For the reason, well conducting monitoring and forecast without delay is a significant work.

In autumn of the city, the sky is high and weather is fine; winter monsoon gradually spreads to the south; cold air slowly occupies the city; air pressure rises little by little; sunny weather usually appears; and wind power now is not very strong, conducive to maturity and harvest of crops in the season. What’s more, the city is frequently hit by typhoon every summer and autumn. Typhoon often brings strong breeze, extraordinary rainstorm and other disastrous weather, which may also cause serious disaster to industrial and agricultural production and people’s life.

 

Taizhou is located in East Asian monsoon climate region, and belongs to subtropical monsoon climate. Most of its perennial prevailing wind direction is southeast wind, of which southeast wind in spring and summer, northeast wind in autumn and northerly wind in winter mostly.

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