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论文利用MODIS遥感数据和常规地面气象观测数据基于SEBAL模型定量反演了山东省区域地表蒸散量(Evaportranspirations,ET),并利用站点Lysimeter实测ET资料与经联合国粮农组织修正的Penman-Monteith公式计算的ET对遥感反演的ET进行验证,获得了较高的精度,日模拟值的平均相对误差约为11.34%,相关系数为0.872,一致性指数达0.917。在此基础上,结合气象站点降水量的空间分布格局,分析了研究区不同土地利用/覆被类型下2005年和2006年逐月与季节的水分盈亏状况。研究结果表明在2005年3—11月期间山东省总的实际蒸散量平均为637.45 mm,降水量为639.61 mm,降水量基本满足ET消耗;而2006年同期蒸散量为578.48 mm,但降水量仅为443.98 mm,水分亏损量为134.50 mm。春秋季节水分亏缺严重,旱情发生的几率较高;夏季水分亏损量相对较小,降水量满足地表蒸散耗水需求。
Based on the SEBAL model, the Evaportranspirations (ET) of Shandong Province were quantitatively retrieved using the MODIS remote sensing data and conventional ground meteorological observation data. The ET data of the Lysimeter site and the Penman-Monteith formula revised by the UN Food and Agriculture Organization ET was used to validate the ET retrieved from remote sensing. The average relative error of daily simulated values was about 11.34%, the correlation coefficient was 0.872 and the consistency index was 0.917. On this basis, combined with the spatial distribution of precipitation at the meteorological stations, the monthly profit and loss of water in 2005 and 2006 under different land use / cover types were analyzed. The results show that the total actual evapotranspiration in Shandong Province was 637.45 mm and the precipitation was 639.61 mm during the period from November to November in 2005, and the precipitation basically met the ET consumption; while the evapotranspiration in 2006 was 578.48 mm, but the precipitation was only Is 443.98 mm, moisture loss is 134.50 mm. In spring and autumn, the water deficit is serious, and the drought probability is high. The moisture loss in summer is relatively small, and the precipitation meets the demand of surface evapotranspiration.