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地理科学  2014 

渭河流域关中段潜在蒸发量时空变化特征

, PP. 1145-1152

Keywords: 潜在蒸发量,FAO,Penman-Monteith,公式,渭河流域关中段

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Abstract:

根据渭河流域关中段11个主要代表气象站点1955~2012年逐日气象数据,以FAOPenman-Monteith公式得出潜在蒸发量,分析渭河流域关中段潜在蒸发量的时空变化特征。结果表明①渭河流域关中段年平均潜在蒸发量在1073.9~1284.1mm,流域内多年平均蒸发量随着海拔的降低逐渐增高。②夏季潜在蒸发量在327.6~547.2mm,占全年的34%~42%,变化趋势与全年潜在蒸发量变化趋势高度一致。③渭河关中段随气温上升,潜在蒸发量减少。④年均潜在蒸发量与日较差、平均气温、平均风速、日照时数呈正相关,与相对湿度和水汽压呈负相关。

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