[关键词]
[摘要]
基于Penman2Monteit h 公式和Budyko 假设, 利用白洋淀流域1960 年- 2011 年的气象、水文资料, 计算分析 了该流域潜在蒸散量与实际蒸散量的长期变化趋势, 并初步分析了实际蒸散量变化与降水变化、潜在蒸散量变化的 关系。结果表明: 过去52 年白洋淀流域潜在蒸散量和实际蒸散量分别以101 3 mm/ ( 10a) 和111 6 mm/ ( 10a) 的速度 呈下降趋势; 年代际变化分析表明, 潜在蒸散量的下降趋势在不同年代际间具有持续性, 而实际蒸散量则表现为波 动下降, 其波动性受降水波动的影响, 年实际蒸散量的变化与年降水的变化呈正相关关系( R2 = 01 99) , 与潜在蒸散 量的变化呈负相关关系( R2 = 01 37) , 即降水量的变化对实际蒸散量的变化起主要控制作用。
[Key word]
[Abstract]
Based on the meteo ro log ical and hy dr olog ical data of Ba iyangdian basin dur ing 196022011, the chang e trends of pot en2 t ial ev apo transpiration( ET 0) and act ual eva pot ranspiratio n( ETa ) and their relatio nship w ere studied by using Penman Mo nt eith formula and Budy ko hy po thesis. Our r esult s showed t hat both ET0 and ETa pr esented a decreasing tr end and the decreasing rate were about 10. 3 mm/ ( 10a) and 11. 6 mm/ ( 10a) , respectively. Through the inter2decadal variation analysis, ET0 was char acter ized by a continuo us decline, and ETa was char acter ized by fluctuate loss, which was influenced by precipitation volatility. The results o f the corre2 latio n analysis showed that the chang e of ETa was po sitively correlated with the chang e of precipitatio n( R2 = 0. 99) , and negatively cor2 related with the change o f ET0 ( R2 = 0. 37) . The precipitat ion was the main driv ing fo rce for the r eductio n o f ETa .
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[基金项目]
国家自然科学基金项目( 41501027)