| 罗玉峰,郑强,彭世彰,毛怡雷.基于GIS 的区域潜水蒸发计算[J].水利学报,2014,45(1): |
| 基于GIS 的区域潜水蒸发计算 |
| Calculating regional groundwater evapotranspiration based on GIS |
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| DOI： |
| 中文关键词: 灌区 潜水蒸发 GIS 空间变异性 |
| 英文关键词: irrigation district groundwater evapotranspiration GIS spatial variability |
| 基金项目: |
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| 中文摘要: |
| 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。 |
| 英文摘要: |
| 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 consideration. A GIS-based regional groundwater evapotranspiration calculation （GREGEC） method was proposed 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 groundwater 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 implemented by programming， which is helpful for upscaling groundwater evaporation from the traditional point scale to the regional scale. |
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