以改进SEBS模型估算苏木吉林南湖的水面蒸发

Evaporation Estimation of the Sumu Jaran South Lake in the Badain Jaran Desert Based on Modified SEBS Model

基于TM/ETM+数据,利用地表能量平衡原理,结合改进了温度算法和地表宽波反照率算法的SEBS模型,对巴丹吉林沙漠东南部苏木吉林南湖2000—2013年的湖面蒸发进行了反演。利用安装在湖面的E601型蒸发皿实测数据对反演结果进行验证,通过相关性分析发现,利用阿拉善右旗气象数据结合SEBS模型计算的湖面蒸发值与蒸发皿实测值相关性较好,R2>0.95,两者的均方根误差RMSE为0.313mm,平均绝对百分比误差MAPE为8.17%。给出了折算方程,折算系数为0.621,并算得2000—2013年苏木吉林南湖湖面年平均蒸发量为1 287.544mm。苏木吉林南湖湖面蒸发与气温相关性最好,日照时数次之,与风速的相关性最弱。

Based on modified Surface Energy Balance System,the evaporation from2000 to 2013 of the Sumu Jaran South Lake,in the southeast of the Badain Jaran Desert,was estimated using TM/ETM+ data.The result was validated by the E601 pan observation evaporation in the lake.It indicated that SEBS result was strongly correlated with pan observation and R2 is more than 0.95(RMSE=0.313 mm,MAPE=8.17%).A conversion equation was set with a conversion coefficient of 0.621.Based on the equation,the annual evaporation of the lake is 1 287.544 mm.The correlations between evaporation and meteorological factors were also discussed in this paper.Temperature and sunshine hours were strongly correlated with evaporation,while wind speed had the least correlation with evaporation.