Climate and landform of Nanjiang town

The main rivers are Nanliu River. Pingzhi and Guang 'en administrative villages, located on the banks of Nanliu River, are threatened by waterlogging because of their low terrain. Due to the increase of siltation in the bed of Nanliujiang River, there are many bends in the river, sudden rainstorm on the ground, rapid runoff, sudden rise of the river and flooding. According to the data provided by Hengjiang Hydrological Station, during the 20 years from 1958 to 1978, the flood disaster occurred in 19, with the frequency of 95%. It is flooded almost every year, but to varying degrees. Located in the northern edge of the tropics, the climate is warm, with an annual average temperature of 265,438 0.8℃. Winter sweet potatoes can safely overwinter, with an active accumulated temperature of ≥ 65,438 00℃ and a safe growth period of double-cropping rice of 265,438 06 days. The average annual sunshine is 18 13.9 hours, and the national total radiation in solar year is11.21kcal/m2, with sufficient light and heat, which is suitable for the growth of double-cropping rice and various cash crops and can mature for more than one year. But there is often a daily average in early spring.