The geographical environment of Qiandeng Town
In ancient times, affected by the resurgence of the Huangpu River, silt was gradually deposited. The parent material of the soil was lacustrine deposits. In some areas, there were both river and sea deposits. The ground endurance was 9 to 13 tons of force/square meter.
Except for an isolated hill in Shaoqing Mountain, which is 12.7 meters above the Wusong benchmark (the same below), the terrain is flat and slightly tilted from northeast to southwest. The general elevation is 2.1 to 4 meters, and the average elevation is 3.5 Mi, belongs to Kunnan semi-high field area.
The average land elevation in Xiaoshu, Shanpu, Wenpu and other villages in the northeast of the town is 3.8 meters, of which 2,192 acres are high fields (above the 1954 flood line of 3.88 meters), accounting for 60 acres of high fields in the town. There are 3,410 acres of low-lying land (meaning below the warning water level of 3.2 meters), which are concentrated in the villages of Taoqiao, Xinjing, Nanjinxing, Xieluo, Diaoshi and Qiqian in the southwest of the town, accounting for 3,410 acres of low-lying land in the town. 81.6%.
The plane terrain is irregular rectangular, about 5 kilometers wide from east to west and about 11 kilometers long from north to south. The territory has a network of rivers and ports, dotted with rivers and lakes. The water city covers an area of 12,597.17 acres, accounting for 19.68% of the total area of the town. It belongs to the Taihu Lake Basin and the Dianmao River System. Qiandeng area belongs to the northern subtropical southern monsoon climate zone, which is humid and mild, with four distinct seasons and abundant rainfall. The characteristics are: spring and autumn are short, summer and winter are long.
Spring in the Qiandeng area usually lasts from Rain to Grain Rain, usually from February 19th to April 20th, totaling about 61 days. The latter part of this stage is the final frost period, with average temperatures of 5 to 20°C and sunshine gradually increasing.
Summer is from Guyu to Sushu, generally from April 21st to August 23rd, totaling about 126 days. This period is a high-temperature period throughout the year, with the average temperature around 25°C and the highest temperature reaching 36-38°C. The sunshine hours are long, typhoons and rain are abundant, and thunderstorms occur from time to time.
Autumn is the period from the end of summer heat to the onset of frost, generally from August 24th to October 23rd, totaling about 60 days. At this stage, the weather gradually turns cooler, the sky is high and the air is crisp, the average temperature is between 10 and 20 degrees Celsius, and frost begins. It is the autumn harvest and autumn planting season in rural areas.
Winter is the period between frost and rain, generally from October 24 to February 18 of the following year, totaling about 119 days. During this period, northwest winds prevail, the temperature drops sharply, the air is dry, and the sunshine is short. The average temperature is between 3 and 5 degrees Celsius. Freezing days are basically concentrated during this period.