SEBS模型在黑河流域中游的应用及参数敏感性分析

Simulating Evapotranspiration Based on SEBS Model and Sensitivity Analysis of the Parameters in the Middle Reaches of Heihe River Basin

干旱区的蒸散发（ET）研究对干旱区的水资源管理和生态系统恢复具有重要意义。本文基于SEBS模型和参考作物蒸散量估算2009年39月黑河流域中游地区蒸散发。使用涡度相关蒸散数据验证表明，SEBS模型能够有效估算黑河流域中游的蒸散发。从各月的ET分布状况来看，区域平均ET有着明显的月变化；植被生长季内ET总量空间分布差异大，在23．4～752．6mm之间，区域平均值为428．7mm通过对SEBS模型参数敏感性分析发现，SEBS模型对地面温度最为敏感，其次是空气温度，再者是风速和反照率，对NDVI和空气湿度的敏感性最小。

The research of evapotranspiration （ET） has great significance for water resource management and ecosystem restoration in arid areas. In this study, from March to September in 2009, the regional ET in the middle reaches of Heihe River basin was estimated based on SEBS （The Surface Energy Balance System） model and reference crop evapotranspiration. Compared with the result of eddy correlation data, the ET es timated by SEBS model was proved to be valid. Due to regional ET of each month, we can find that the re gional average ET obviously varied month to month. The result also showed a large difference of ET a mount in crop growth season of research area which distributed from 23.4 mm to 752.6 mm and the regional average was 428.7 mm. And the parameters sensitivity analysis showed that the ET had different response to variation of parameters concerned with SEBS model. The sensitivity of land surface temperature was the biggest, followed by air temperature, wind, and surface albedo in order. SEBS model was the most insensi tive to NDVI and air humidity.