基于GIS的区域潜水蒸发计算  

Calculating regional groundwater evapotranspiration based on GIS

作　　者：罗玉峰[1,2] 郑强[2] 彭世彰[1] 毛怡雷[1,2] 

机构地区：[1]河海大学水文水资源与水利工程科学国家重点实验室,江苏南京210098 [2]河海大学南方地区高效灌排与农业水土环境教育部重点实验室,江苏南京210098

出　　处：《水利学报》2014年第1期79-86,共8页Journal of Hydraulic Engineering

基　　金：国家自然科学基金资助项目(50809021;51179048);水文水资源与水利工程科学国家重点实验室自主研究项目(2010585412);江苏高校优势学科建设工程资助项目

摘　　要：潜水蒸发受气象、土壤、地下水埋深以及土地利用(作物种类)多种因素的影响,计算区域潜水蒸发量时应考虑这些因素具有空间变异性。考虑灌区土地利用、土壤类型和地下水埋深等因素对潜水蒸发量影响,提出一种基于GIS的区域潜水蒸发计算方法(GREGEC),并在ArcGIS10.0中利用其内置的VBA环境完成Arcobjects编程计算。在河南省柳园口灌区的应用表明,GREGEC计算的多年平均潜水蒸发量与水量平衡法的计算结果误差为2%;与灌区地下水模型所得结果的空间分布比较一致,但逐月潜水蒸发量变化规律更合理。GREGEC方法能有效提高区域潜水蒸发量计算精度,且方便编程实现,将传统点尺度的潜水蒸发量计算提升到灌区尺度。Groundwater evapotranspiration is affected by metrological conditions, soil type, groundwater depth and land use （crop variety）, and the spatial variability of all these factors should be taken into con-sideration. A GIS-based regional groundwater evapotranspiration calculation （GREGEC） method was pro-posed and implemented by programming ArcObjects with VBA in the environment of ArcGIS 10.0. The method was applied to calculate regional groundwater evapotranspiration in Liuyuankou Irrigation System and the outputs were compared with the methods of water balance and groundwater modeling. The results show that compared with the water balance method, the error in annual groundwater evapotranspiration is about 2%;the spatial distribution patterns of groundwater evapotranspiration from the GREGEC and the groundwa-ter modeling method are similar, while the monthly groundwater evapotranspiration from GREGEC is more reasonable. The GREGEC method can improve the estimation accuracy and it was convenient to be imple-mented by programming, which is helpful for upscaling groundwater evaporation from the traditional point scale to the regional scale.

关 键 词：灌区 潜水蒸发 空间变异性 

分 类 号：S274.2[农业科学—农业水土工程]