在干旱地区使用再分析和WaPOR产品进行基准蒸发透气估计 农田
Shadman Veysi1, Milad Nouri1, Anahita Jabbari2
1Soil and Water Research Institute (SWRI), Agriculture Research Extension Education Organization (AREEO), Alborz, Karaj, Iran.
Heliyon
|February 29, 2024
概括
ERA5数据最好地估计了农田的参考蒸发透气 (ETo),尽管WaPOR在复杂的地形中表现出色. 将来源结合起来可以提高准确性,在地面数据稀缺的情况下,可以进行更好的水资源管理.
科学领域:
- 水文和水资源管理 水文和水资源管理
- 农业气象 农业气象学
- 遥感和地理空间分析
背景情况:
- 准确的参考蒸发透气 (ETo) 对于作物用水需求至关重要,但在干旱作物土地上,地面站数据通常是有限的.
- 现有的气象数据集可能无法准确地反映农业地区的条件,影响ETo估计.
- 由于农气站的稀缺性,需要评估替代数据源以进行可靠的ETo计算.
研究的目的:
- 评估ERA5,ERA5-Land和水生产率开放访问门户 (WaPOR) 数据集的有效性,以估计耕地地区的ETo.
- 使用统计指标,将这些数据集的准确性与地面ETo测量进行比较.
- 为了确定一个盆地内的不同地形条件中对ETo估计最合适的数据源.
主要方法:
- 利用欧洲航天局 (ESA) 的土地使用/土地覆盖 (LULC) 数据来确定代表农气站的耕地.
- 从2009年到2022年收集数据,并应用FAO-Penman-Monteith方法进行每日和每月ETo估计.
- 评估数据集的性能使用正常化根平均平方误差 (nRMSE) 和相对平均偏差误差 (rMBE) 与基本真相相比.
主要成果:
- 与ERA5-Land和WaPOR相比,ERA5在估计ETo方面表现优越.
- 在具有复杂地形的高海拔地区,WaPOR的表现优于ERA5和ERA5-Land.
- 没有单一的数据集在所有评估站提供一致准确的ETo估计,这表明需要数据融合.
结论:
- 结合表现最好的数据源,比使用单一数据集提供了更好的ETo准确性,尤其是在数据稀缺的地区.
- 这些发现支持加强灌计划和大规模水资源管理,特别是在干旱地区的农业环境中.
- 该研究通过改进的ETo估计方法来优化用水效率提供了宝贵的见解.
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