Climate and Hydrology in Shidian Town

Shidian belongs to the transition zone from subtropical zone to warm temperate zone, with mild climate, moderate rainfall, abundant sunshine, long frost-free period and obvious monsoon. Leng Xia is hot in winter with four distinct seasons, which is very beneficial to the growth and development of crops. However, because it is located in the transitional climate zone, the weather is changeable, especially the interannual and seasonal changes of precipitation are great, which often leads to droughts and floods and seriously affects agricultural production.

The annual average temperature 15.4℃, the lowest year 14.4℃ and the highest year 16.9℃ have little difference and are relatively stable from year to year. The active accumulated temperature greater than or equal to 10℃ is 4975℃ for 228 days, and the active accumulated temperature greater than or equal to 0℃ is 5628.7℃ for 340 days. The average frost-free period is 222 days, the first frost is 65438+ 10, the latest frost is165438+124, with an average of165438+10. The final frost period is February 28th at the earliest and April 14 at the latest, with an average of March 27th; The annual minimum temperature is 65438+ 10 month, the annual average is 1.8℃, and the minimum temperature is 1.3℃. The highest temperature is in July, the annual average temperature is 28℃, and the lowest temperature is 26℃. The annual average sunshine hours are 2 1.63 hours, and the sunshine percentage is 49%. The annual average wind power is 2-3, and the maximum wind power is 7-8. In January, February, March, November and December, there are many northeast winds and snow and frost. In April and May, it was southerly and dry, and in June, July and August, it was southeasterly and rainy.

Shidian Town's own water resources are insufficient, and Meishan Reservoir gives support. Surface water mainly comes from rainfall, with an average annual precipitation of 95 1.3mm, surface runoff depth of 324.5mm, effective catchment 168.5mm, and total annual runoff of the whole town 1967. 1 m3. The months with the most precipitation are June, July and August, accounting for 45.5% of the annual precipitation, and the months with the least precipitation are 1 month, February and1February, accounting for 8.2% of the annual precipitation. The maximum precipitation is 199 1, and the precipitation in 2003 was 1398.6 mm and 1280 mm respectively. Along the Hegang River and lakes, the runoff is large and the water storage capacity is small, and the drainage water is the main one, followed by water.

The town is located in the second terrace of wavy plain area, which belongs to the pore water and groundwater poor area of Upper Pleistocene. 1986, 1988, shidian district and town successively drilled wells behind the refrigeration plant and shidian grain station, and drilled deep wells 100 meters, with little water, which was unusable and abandoned. Because it is "pore water", some places are rich in groundwater. Shidian Town has drilled deep wells in Zhengta and Shidian Vocational Colleges, and the water inflow of a single well is 1.000 tons-1.02 tons/day. In particular, the first terrace of Chengxi Lake and its surrounding areas are rich in groundwater and have a large inflow, which complements the Huaihe River.