| 半干旱地区蒸散发时间尺度扩展方法对比分析 |
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| 引用本文： | 翟劭燚,王文种,刘九夫,王欢,陆之昂.半干旱地区蒸散发时间尺度扩展方法对比分析[J].水文,2019,39(3):8-14. |
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| 作者姓名： | 翟劭燚 王文种 刘九夫 王欢 陆之昂 |
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| 作者单位： | 南京水利科学研究院;水利部应对气候变化研究中心 |
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| 基金项目： | 国家自然科学基金项目(51579148)； |
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| 摘 要： | 蒸散发量(ET,evapotranspiration)的时间尺度扩展是遥感反演区域ET的关键。为评价由瞬时潜热通量经时间尺度扩展方法计算日蒸散发量的可靠性,利用美国西南部半干旱地区的Walnut Gulch实验流域草地站点的波文比系统实测数据,分析评价蒸发比法、简化蒸发比法、作物系数法、简化参考作物系数法、正弦关系法、冠层阻力法和修正冠层阻力法共7种蒸散发时间尺度扩展方法的估计效果,统计结果显示,7种蒸散发时间尺度扩展方法总体趋势具有一致性,存在着一定的规律性,采用10:00~14:30的瞬时值估计较为接近实测蒸发值。正弦法、简化参考作物系数法及简化的蒸发比法的模拟精度较高(相对均方根误差在20%左右),比较适合于估算半干旱地区的日蒸散发量。对具有相近气象、气候、下垫面条件和空间尺度数据且具有充足气象观测资料的地区,推荐采用基于简化作物系数的时间尺度扩展方法开展从小时到日的ET时间尺度扩展,对于缺少气象观测资料的类似地区,推荐采用正弦法和简化的蒸发比法进行时间尺度扩展。
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| 关 键 词： | 蒸散发量 时间尺度扩展 蒸发比 作物系数 正弦关系 冠层阻力 不确定性分析 |
| 收稿时间： | 2018/2/28 0:00:00 |
Comparative Analysis of Temporal Scale Expansion Methods for Evapotranspiration over Semi-arid Areas |
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| ZHAI Shaoyi,WANG Wenzhong,LIU Jiufu,WANG Huan,LU Zhiang.Comparative Analysis of Temporal Scale Expansion Methods for Evapotranspiration over Semi-arid Areas[J].Hydrology,2019,39(3):8-14. |
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| Authors: | ZHAI Shaoyi WANG Wenzhong LIU Jiufu WANG Huan LU Zhiang |
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| Institution: | (Nanjing Hydraulic Research Institute,Nanjing 210029,China;Research Center for Climate Change,MWR,Nanjing 210029,China) |
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| Abstract: | Evapotranspiration (ET) temporal scale expansion methods play an important role in ET remote sensing. Tliis study aimed to compare and assess the accuracy of seven temporal scale expansion methods. Based on the measured data of the observed flux site located in the Walnut experimental basin in the southwestern United States, it analyzed the estimation effect of seven methods: evaluation of the constant evaporative fraction method, the simplified evaporation fraction method, crop coefficient method, simplified crop coefficient method, sinusoidal relation method, canopy resistance method and modified canopy resistance method. The results show that the 7 methods are consistent in the overall trend, and the simulation precision of the revised crop coefficient method, simplified crop coefficient method and the simplified evaporation fraction method (relative root mean square error is about 20 %) are much higher, which are suitable to estimate the daily evapotranspiration in semi-arid areas. For the areas with similar climate, meteorological conditions, underlying surface conditions, spatial scale data and with enough meteorological observation data, the temporal scale expansion method based on the improved crop coefficient is recommended to extend the time scale from the hour to the day. For the similar areas without meteorological observation data, the sinusoidal method and simplified evaporation fraction method are recommended for temporal scale expansion. |
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| Keywords: | evapotranspiration (ET) temporal scale expansion evaporative fraction crop coefficient sine relation canopy resistance uncertainty analysis |
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