Physical geography of Yangpu district

The land was formed in the Tang and Song Dynasties and the early Song Dynasty. According to the Records of Wumen Water Conservancy in the Northern Song Dynasty, there are 18 tributaries in Wusong Jiang Nanan. The easternmost ones are Shanghai Pu, Xiahaipu, Nanjipu, Jiangmangpu and Mud Pu, and the catch spacing is 5 ~ 7 miles. According to this, it can be inferred that the mud was spread to the east of Fuxing Island in the Northern Song Dynasty. According to the inscription on the reconstruction of Jingde Temple (now Wan 'an Road Primary School) in the northwest of this area, it was originally the Dragon Palace, with its gate facing east and facing the sea, which was built in the early Northern Song Dynasty. In addition, Taiping Temple (three question marks on Lanzhou Road) in the south of this area was built during the period of Taiping and Xingguo in the Northern Song Dynasty (976 ~ 984), which was the earliest Buddhist temple built in this area, indicating that it had developed to a certain extent in the Northern Song Dynasty.

This area is an alluvial plain in the front of the Yangtze River Delta and a part of the early coastal plain. Over the years, the Yangtze River has carried a lot of sediment and deposited it into land under the action of waves, tides and currents. On the left, near the lower reaches of Huangpu River, there are estuarine beaches and sand islands, which are artificially piled up into Zhoujiazui Island Ridge Fuxing Island and * * * Green Forest Park. Between the north of Zoumatang and the Qiujiang River is the lower reaches of the Guwushi River, which is several miles wide and gradually silted up due to the influence of sediment. After the diversion in the early Ming Dynasty, meadow soil with sand and mud was formed. After long-term cultivation by farmers, it has developed into a vegetable garden owner in the south and rice in the north. The area is located in the southern edge of the north subtropical zone and belongs to the subtropical monsoon climate. It is characterized by mild climate, abundant rain and light, and distinct seasons.

The annual sunshine hours and annual total radiation in this area belong to the high value area of Shanghai. Its distribution law is increasing from south to north. The annual total radiation in the south of this area is 1 14 kcal/cm2, and in the north it is116 ~118 kcal/cm2.

The days when the highest temperature in this area is greater than or equal to 35℃ in a year are about 6 ~ 8 days. The extreme maximum temperature is 38 ~ 382℃. 1The extreme maximum temperature on July 8, 978 was 38.9℃.

In general, the days when the lowest temperature is less than or equal to -5℃ are 4 ~ 5 days. The extreme minimum temperature is -9.5-10℃. 1967 65438+ 10/0/6, extreme minimum temperature-10. 1℃.

The annual rainfall in this area is1060mm in the south and1040 ~1060mm in the north. The rainfall in flood season is about 600 ~ 640mm.

The maximum rainstorm in this area gradually increases from south to north. The maximum daily rainstorm in the south is about 250 ~ 300mm, which is higher than that in the central city. It is about 300 ~ 350 mm in the north, which is much higher than that in the urban area. The annual average number of rainstorm days in the region is 2.62.8 days, and the average rainstorm amount is 76 ~ 79 mm/day. 1985 maximum precipitation 1623.6 mm, minimum precipitation 197 1 year, only 700 mm

The distribution of effective wind energy density in Shanghai is centered around the city center and surrounded by Yangpu, and the wind energy density is between 80 ~ 100 W/m2.

Yangpu is an industrial zone with high energy consumption, high population density and dense buildings. The phenomenon of "heat island" is obvious, the temperature is obviously higher than that in the suburbs, the intensity is dry at night and during the day, the early winter is greater than that in summer, and the sunny and windless weather is the strongest. According to the observation at 20: 00 on June1979 65438+February 13, the temperature in Pingliang Road of Yangshupu Road is 6 ~ 6.5℃. The distance from the north of Changyang Road to Kongjiang Road is 5.56 C；; The temperature from the north of Kongjiang Road to Wujiaochang is 5 ~ 5.5℃. The temperature in the urban area is between 8 and 9 degrees Celsius.

The accumulated temperature in Yangpu District from May to September is slightly lower than that in the central area, which is about 3700 ~ 3720℃.

The extreme value of disastrous weather and climate in Yangpu District is basically consistent with that in the whole city. Cold wave freezing in the middle of winter; Abnormal rainy season at the turn of spring and summer; Rainstorms in summer and hail and tornadoes accompanied by thunderstorms often bring sudden disasters.