摘要
利用四川盆地蒸发皿蒸发量、气温、风速、日照时数、气压和水汽压资料,分析了1980—2010年四川盆地蒸发皿蒸发量的变化及其原因。结果表明,四川盆地蒸发皿蒸发量存在明显的时空变化特征,空间上川中丘陵区的蒸发皿蒸发量最大,川西平原次之,川东平行岭谷区域最小;时间上年蒸发皿蒸发量存在明显的波动上升趋势,季节序列中,秋季和冬季蒸发皿蒸发量增加趋势明显,春季和夏季没有明显趋势。对蒸发皿蒸发量变化有显著影响的气象因子依次为日照时数、平均风速、水汽压和气温,其中日照时数对蒸发皿蒸发量的增大作用是风速的1.71倍,是水汽压的2.48倍,而气温具有减少蒸发皿蒸发量的作用,其减弱蒸发皿蒸发量的平均强度是日照时数的1/4。
Based on the data of daily pan evaporation , air temperature , wind speed , sunshine duration , air pressure , and vapor pressure of the Sichuan Basin , the pan evaporation variation and its causes in the basin from 1980 to 2010 were analyzed .The results show that the pan evaporation in the Sichuan Basin had obvious spatial and temporal variation characteristics .The largest pan evaporation was found in midland Sichuan Basin with hilly areas , followed by that in the western Sichuan Plain , and the smallest pan evaporation was found in the parallel valley area in eastern Sichuan Basin .A significant upward trend was found in the annual pan evaporation .The pan evaporation had a significant increasing trend in the autumn and winter , while no significant trend was found in the spring and summer.The main meteorological factors influencing the pan evaporation included the sunshine duration , the average wind speed , vapor pressure , and air temperature , and the impact of sunshine duration on the pan evaporation increase was 1.71 times that of the wind speed , and 2.48 times that of the vapor pressure .However , the air temperature could reduce the pan evaporation , and the pan evaporation reduced by the air temperature was one fourth of that reduced by the sunshine duration on average .
出处
《水资源保护》
CAS
2014年第3期38-44,60,共8页
Water Resources Protection
基金
国家自然科学基金(41371050)
关键词
蒸发皿蒸发量
因次分析
影响因子
四川盆地
pan evaporation
dimensional analysis
impact factor
Sichuan Basin
