漳河流域潜在蒸发量时空变化特征

Temporal and spatial variation characteristics of potential evaporation in Zhanghe River Basin

由于人类活动和气候变化等原因,漳河流域水循环特征发生重大变化,地表水和地下水资源量均呈现不同程度的减少。蒸发是水循环的重要环节,研究蒸发量的时空变化对理清研究区水循环变化的原因有一定意义。本文利用彭曼公式和ArcGIS空间分析等方法,分析了研究区潜在蒸发量时空变化特征。结论:近50 a来,研究区潜在蒸发量呈显著上升趋势,这与该区气温上升,近地风速和相对湿度下降密切相关;空间上研究区潜在蒸发量呈现由东北向西南逐渐增大的趋势,总体在815.05~982.86 mm之间,其中,东北部和顺县最低,为815.05 mm,西南部沁县最高,为982.859 mm。

Due to human activities and climate change,the characteristics of water cycle in Zhanghe River Basin have changed greatly,and the amount of surface water and groundwater resources have decreased in varying degrees.Evaporation is an important part of water cycle.Studying the temporal and spatial variation of evaporation is of certain significance to clarify the causes of water cycle variation in the study area.In this paper,the temporal and spatial variation characteristics of potential evaporation in the study area are analyzed by using Penman formula and ArcGIS spatial analysis.Conclusion:in the past 50 years,the potential evaporation in the study area has shown a significant upward trend,which is closely related to the increase of temperature and the decrease of near ground wind speed and relative humidity;Spatially,the potential evaporation of the study area gradually increases from northeast to southwest,generally between 815.05-982.86 mm,of which Heshun County in the northeast is the lowest,815.05 mm,and Qin County in the southwest is the highest,982.859 mm.