蒸发皿蒸发量及主要气象因子变化分析——以桂林灌溉试验站为例

Analysis of Pan Evaporation and Main Meteorological Factors——a Case Study in Guilin Irrigation and Drainage Experiment Station

以广西桂林灌溉试验站1980-2003年气象要素实测资料为例,分析蒸发皿蒸发量及主要影响因子的变化特点和规律。采用距平百分率法、滑动平均法和Kendall秩次相关法分析了蒸发量、气温、降雨量、风速、日较差、相对湿度的变化特点。分析结果表明,桂林农田灌溉试验站1980-2003年的蒸发量、降雨量、日较差和相对湿度呈上升趋势,其中蒸发量和相对湿度上升趋势显著,而降雨量和日较差不显著;风速和气温呈下降趋势,且风速下降趋势显著,而气温下降趋势不显著。

Based on the measured data in Guilin Irrigation and Drainage Experiment Station during 1980-2003,the change characteristic of pan evaporation and the main meteorological factors are analyzed.The change trend of pan evaporation,air temperature,precipitation,wind speed,diurnal temperature and relative humidity are also analyzed by using the anomaly percent,sliding mean method and Kendall rank correlation method.The results indicate that pan evaporation,precipitation,average diurnal temperature and average relative humidity show an increase trend and the increase trend of pan evaporation and average relative humidity is obvious,while the increase trend of precipitation and average diurnal temperature is not obvious.The average wind speed and average air temperature show a decrease trend,and the decrease of average wind speed is obvious while the average air temperature is not.