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地表蒸散的估算在干旱半干旱区水资源研究中具有重要意义。利用NOAA/AVHRR遥感资料、NCEP再分析格点资料和气象站点资料,根据能量平衡模型和FAO-17 Penman公式,计算了研究区域内逐日蒸散发量;对于晴天,用遥感模型反演出瞬时蒸散,进而推算出日蒸散;同时用FAO-17 Penmen公式和气象资料,计算研究区域内的同一天的蒸散,利用气象资料计算得到的蒸散与遥感估算的蒸散的关系,估算非晴空日的蒸散,进而得到逐日蒸散发结果。与同类研究结果的比较表明:该方法能够估算逐日蒸散发,通过气象与遥感资料结合,提高了气象格点资料的空间分辨率,弥补了难以得到遥感逐日晴空资料的不足,同时也为流域内同类研究提供参考依据。
Estimation of surface evapotranspiration is of great importance in the study of water resources in arid and semiarid regions. Using NOAA / AVHRR remote sensing data and NCEP reanalysis grid data and meteorological site data, daily evapotranspiration was calculated according to energy balance model and FAO-17 Penman formula. For sunny days, transient evapotranspiration was retrieved by remote sensing model, And calculate the daily evapotranspiration. At the same time, the evapotranspiration of the same day in the study area was calculated by FAO-17 Penmen formula and meteorological data. The relationship between evapotranspiration and remotely sensed evapotranspiration calculated by meteorological data was used to estimate evapotranspiration on non-clear day and further Get evaporative results daily. Compared with similar research results, this method can estimate daily evapotranspiration and improve the spatial resolution of meteorological grid data through the combination of meteorological data and remote sensing data. This method can make up for the lack of remote sensing clear sky data, Similar research provides a reference.