Analysis of winter cold-warm changes in northern section of Anyang River of Middle Route of South-to-North Water Diversion Project from 1981 to 2021
To better serve the water diversion scheduling of the Middle Route of South-to-North Water Diversion Pro-ject during the ice period by revealing the characteristics of winter air temperature change,based on the winter daily mean air temperature data of 8 national weather stations along the project from 1981 to 2021,statistical methods such as climate normal and climate tendency rate were used,and according to the national cold winter and warm winter grade standards,the climate characteristics of winter cold-warm changes in the northern section of the Anyang River of the main channel were statistically analyzed on an annual scale.The results showed that:① From 1981 to 2021,the mean winter air temperature of each weather station was basically between-5 ℃ to 3 ℃,which was generally high in the south and low in the north in space,and the air temperature difference between the north and the south was basically be-tween 3 ℃ to4℃.②From 1981 to 2021,the inter-annual variation of mean winter air temperature at each weather station was basically the same,showing a fluctuating upward trend as a whole,with a temperature increase range of 0.113 to 0.713 ℃ every 10 years,the overall warming rate was low in the north and south,and high in the middle.③ From the perspective of inter-annual variation,the average winter temperature of each station in the 1980s was the lowest,and most of them were cold-winter years.On the whole,the 1980s,1990s and 2010s showed a warming trend,with the most significant warming in the 2010s and a cooling trend in the 2000s.Among them,in the 2000s and the 2010s,the average winter air temperature of each station fluctuated frequently and had a large amplitude,with the standard deviation of the average winter air temperature exceeding 1.0 ℃.④ In recent 41 years,there were 12 regional warm winter years,mainly after the mid-1990s,and the regional cold winter years appeared a total of 18 times,of which there were the most in the 1980s,and the least in the 1990s.Since the end of the 1990s,the regional cold winter years and warm winter years often occurred alternately,but after 2014,the regional warm winter years were obviously more.The research results could pro-vide a reference for optimizing the water diversion operation during the ice period and improving the channel flow capaci-ty in winter.
cold-warm changewinter climatic characteristicswater diversion during ice periodMiddle Route of South-to-North Water Diversion ProjectAnyang River
万方数据
维普
