1960-2017年扬州地区参考蒸发蒸腾量变化特征研究

Study on the Variation Characteristics of Reference Evapotranspiration in Yangzhou Area from 1960 to 2017

为研究扬州地区参考作蒸发蒸腾量(ET_(0))不同时间尺度的变化特征,采用1960-2017年气象数据,利用Penman-Monteith公式计算了ET_(0),发现1—12月ET_(0)表现为先增加后减小的趋势。夏季ET_(0)最大,其次为春季、秋季、冬季。趋势分析显示1960—2017年春季ET_(0)表现为显著增加的趋势,其他季节变化趋势不显著;年ET_(0)表现为显著增加的趋势。小波分析显示扬州地区的年ET_(0)存在20~28、29~42、43~64年变化周期;其中29~42、43~64年的变化周期具有全局性,周期变化最明显。研究结果可为扬州地区灌溉排水规划和防灾减灾提供参考依据。

In order to study the variation characteristics of evaporation and transpiration(ET_(0))of reference crops in Yangzhou area on different time scales,using lake meteorological data from 1960 to 2017,the ET_(0) was calculated by penman Monteith formula.It was found that from January to the next December,ET_(0) showed a trend of first increasing and then decreasing.ET_(0) was the largest in summer,followed by spring,autumn and winter.Trend analysis shows that ET_(0) showed a significant increase trend from 1960 to 2017 spring,and other seasonal trends are not significant;ET_(0) showed a significant increase trend in.Wavelet analysis shows that the annual precipitation in Yangzhou had 20~28 years,29~42 years and 43~64 years;Among them,the change cycles of 29~42 years and 43~64 years were overall,and the cycle change was the most obvious.The results can provide reference for irrigation and drainage planning and disaster prevention and mitigation in Yangzhou.