Geographical environment of Canglang District

Canglang District is located in the south of Suzhou, with the East Ring Road in the east and Suzhou Industrial Park in the east. West to Changchuan Bay, along Waicheng River and Xiajiahe South, west from Sanxiang Road to Sijing Bridge, south to Beijing-Hangzhou Canal along Lishuang River, opposite to Jinchang District, Suzhou High-tech Zone and huqiu district; It starts from the southern end of Lishuangqiao, Sufu Highway and Xinyou Road, and goes east along Ren Xian Dagang to Sujia Highway, adjacent to huqiu district and Wuzhong District. The north is bounded by Xiangmentang and Ganjiang, and bounded by Pingjiang District and Jinchang District.

Canglang District, like other urban areas in Suzhou, belongs to the lower Yangtze paraplatform. In its long geological history, it experienced three strong crustal movements and magmatic activities in Indo-China Peninsula, Yanshan Mountain and Xishan Mountain, as well as the impact and cleaning of neotectonic movements. During the Cambrian period more than 570 million years ago, Suzhou area was widely distributed in shallow areas and accepted a set of carbonate deposits. During the Devonian period of 400 million years ago to several hundred million years of Quaternary, the strata were deposited and regressed many times. Suzhou area has experienced the alternation of shallow sea and land, and the geological course of land formation of 200 million years, and repeatedly deposited continental strata, marine strata and inland lake basin facies strata. Taihu Lake was formed during the last regression.

According to the East China stratigraphic regionalization Table, Suzhou stratum belongs to the stratigraphic division of the south of the Yangtze River. Suzhou has been a famous water city since ancient times and is known as the "Oriental Water City". At the beginning of Wu Zixu's city construction, water was regarded as an important theme of urban planning. Using natural rivers, the criss-crossing rivers in the city and Xupu, Xu Xi and other waterways outside the city are excavated to connect rivers and lakes, forming a more reasonable water network system of Taihu Lake. Huang Xie, king of Chu, further dredged and excavated on the original basis when he ruled Wu in the spring, forming a "four vertical and five horizontal" urban inland river network. The urban river course is 82km from "seven verticals and fourteen horizontals" in the Southern Song Dynasty to about 90km in the late Ming Dynasty and 57km from "three horizontals and four horizontals" in the Jiaqing period of Qing Dynasty. After the river filling in the Qing Dynasty, the Republic of China and the late 1950s, and the excavation since the 1980s, there are still 35 kilometers of rivers in the city. Dredging has been carried out in an all-round way, and water environment control has achieved initial results.

Canglang District is located in the south of Sioux City. Among the existing "three horizontals and three verticals" major rivers in the city, two horizontals and two verticals pass through the area, and Nanyuan water system is distributed in the south of the city, with a total length of18.5km.. The moat outside the city passes around the city, and more than half of it flows through Canglang District. Xujiang and Dalong River lead from Canglang District to Wuxian City (now Wuzhong District and xiangcheng district); Branches crisscross and crisscross into a net. The total length of rivers outside the area is 25 kilometers. According to the data of 195 1 to 1999, the annual average temperature in Suzhou is 15.7℃, with the highest being 17.0℃ in 1953 and the lowest being1. The hottest is July, with an average temperature of 28.2℃, and the coldest is 65438+ 10, with an average temperature of 3℃. In spring (March-May), the temperature rises rapidly, with an average temperature of 14.2℃, and the monthly average temperature rises by 5℃, especially in April by 6℃. However, due to the frequent exchange of cold and warm air in the middle and lower reaches of the Yangtze River, the temperature fluctuation is unstable, and it is hot and cold. In April, there is often "cold spring" weather below 0℃. It entered the rainy season in June, and the temperature did not rise significantly. After plum blossom in July, it entered midsummer, controlled by subtropical high, with the highest temperature, with a monthly average of 28.2℃. In summer (June-August), the average maximum temperature is 32℃, and the extreme maximum temperature is 39.2℃, which appears on July 29th. 1992. In autumn (September ~165438+1October), the average temperature is 17.6℃. The weather was hot in early September, commonly known as "autumn tiger". Since mid-September, the Pacific subtropical high has withdrawn southward, cold air has become increasingly active, and the temperature has dropped significantly, with an average monthly drop of more than 5℃. Winter is controlled by the continental cold high pressure, with cold and little rain, and the average temperature is 4.3℃. The end of June 5438+10 is the coldest period in a year, with an average temperature of 3℃. The extreme minimum temperature is -9.8℃, appearing in 1958 65438+ 10/0/6.