OALib Journal期刊
ISSN: 2333-9721
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东江流域实际蒸发量与蒸发皿蒸发量的对比分析
DOI: 10.11821/xb200903002, PP. 270-277
Keywords: 实际蒸发量,蒸发皿蒸发量,气象因子,东江流域
Abstract:
利用东江流域1956-2003年的水文、气象资料,用趋势线分析、集对分析和方差分析方法对年实际蒸发量和年蒸发皿蒸发量的变化特征及其与气象因子的关系进行对比分析,揭示其相同与相异之处。结果表明实际蒸发量与蒸发皿蒸发量都有减少的趋势,但蒸发皿蒸发量减少的趋势显著,实际蒸发量减少的趋势不显著;两者都在20世纪90年代出现最小值;实际蒸发量与蒸发皿蒸发量存在不确定相关关系和弱的负相关关系。温度与实际蒸发量、蒸发皿蒸发量都为不确定相关关系;风速与蒸发皿蒸发量为正相关,与实际蒸发量为不确定相关关系;随降水量的变化,两种蒸发量的变化相反,即一个增加而另一个减小;随日照时数的变化,趋势线分析与集对分析都反映出两者有相反的变化,通过年景分析,随日照时数的增加,蒸发皿蒸发量增加,实际蒸发量先增加后减小。年日照时数偏多、降水量偏少时,蒸发皿蒸发量显著偏多;年日照时数为中等、降水量偏多时,实际蒸发量最大,但没有达到显著水平。
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