利用区域遥感ET分析山东省地表水分盈亏的研究

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。

Analyze the Regional Water Budget in Shandong Province by Applying the Evapotranspiration Remote Sensing Method

Evaportranspiration(ET) of Shandong Province was assessed by MODIS satellite image coupling with meteorological data based on SEBAL model herein. It was revealed from the analysis results that ET derived from MODIS data was in very good agreement with the measurement by lysimeter and the calculation recommended by FAO Penman-Monteith method, with the consistency index of 0.917, correlation coefficient of 0.872, and daily relative error of about 11.34%. Further, the monthly and seasonal water budget of different land use/land cover types during 2005 and 2006 have been analyzed by coupling retrieved regional ET and spatial interpretation of precipitation. Results show that the total average of actual ET and precipitation during the month of March to November in the year 2005 were about 637.45 mm and 639.61 mm, respectively. The mean precipitation can almost meet the water consumption of ET. While in the year 2006, the actual ET and precipitation for the same period were respectively averaged 578.48 mm and 443.98 mm. The water loss reached 134.50 mm. It was also found that water deficit and drought were more serious in spring and autumn compared to that in summer.