淮河流域潜在蒸散量的变化特征及其与气候因子的关系分析--以蚌埠市为例

[目的]探明淮河流域水分盈亏与气候的内在联系。[方法]以蚌埠市为例,利用FAO推荐的Penman-Monteith方法计算该地区2006—2015年逐日潜在蒸散量,分析潜在蒸散的年均、月均变化特征,以及与风速、降水量、日照时数、气温等气候因子旬平均值的关系。[结果]近10年蚌埠市潜在蒸散发接近多年平均降雨量,总体呈下降趋势,但近3年起伏较大;蒸散量年内分布不均,呈单峰型,夏季多、冬季少,与降雨期基本同步;气温和日照时数对潜在蒸散的影响最大,降雨量对其间接产生影响,而风速对其影响不大。[结论]该研究可为该地区缓解水资源供需矛盾、合理制定用水计划提供参考。

Variational Behavioro f Pto ential Evapotranspiration in Huaihe River Basin and Its Relait onship with Cl imat e Facto rs-A Case Study i n Ben gbu City

Objective] The aim was to explore the intrinsic link between moisture and climate in Huaihe River Basin.[Method] With Bengbu City as an example ,daily potential evapotranspiration during 2006-2015 was calculated by Penman-Monteith method recommended by FAP. The annual,monthly variation features of potential evapotranspiration were analyzed ,as well as its relationship with ten-day average of climate factors such as wind speed,precipitation,sunshine hours,temperature .[Result] The results showed that in recent 10 years,the potential evapo-transpiration of Bengbu City was close to the average rainfall for many years,it had a downward trend in general but a big fluctuation in recent 3 years;the distribution of evapotranspiration was uneven within a year,indicating a single peak type,more in summer and less in winter;tempera-ture and sunshine duration had the greatest influence on the potential evapotranspiration,rainfall had an indirect effect and wind speed had little effect on potential evapotranspiration.[ Conclusion] The study can provide reference for alleviating the contradiction between water supply and de-mand,formulating appropriate water use plan.