基于MODIS产品和SEBAL模型的三江平原日蒸散量估算

Study on Daily Evapotranspiration Estimation of Sanjiang Plain Based on MODIS Product and SEBAL Model

在SEBAL模型的基础上,集成MODIS产品和气象数据进行了三江平原的日蒸散量估算,然后以2005年6月22日的蒸散量估算结果为例,在ArcGIS空间分析模块的支持下对不同土地覆盖类型的日蒸散量进行统计分析。结果表明:遥感估算的蒸散量与利用涡度相关系统实测的蒸散量的相对误差较小且相关性较好,平均相对误差为11.2%;不同土地利用类型的日蒸散量间差别显著。水体和林地的蒸散量较大,平均蒸散量分别为8.2mm和6.5mm;湿地和水田次之,平均分别为5.2mm和4.8mm;旱田的蒸散量最低,平均仅为3.7mm,基本符合蒸散规律。

Based on SEBAL model, the daily evapotranspiration of Sanjiang Plain in Northeastern China was estimated by using MODIS/TERRA products and meteorological data collected in meteorological stations distributed over the study area. The estimation results of June 22nd, 2005 was taken as an example in the analysis of daily ET characteristics of different land covers in the study area by using the spatial analysis module of ArcGIS. Comparison of the evapotranspiration estimated with MODIS products and field observation showed that the average relative error was 11.2%. It was concluded that evapotranspiration of water body and forest were high, which were 8.2mm and 6.5mm respectively. They were followed by wetland and paddy field, which were 5.2mm and 4.8mm respectively. Evapotranspiration of dry land was lowest, which was 3.7mm. Basically, these results were in line with the rule of evapotranspiration.