SEBAL模型及其在区域蒸散研究中的应用

蒸散是地表能量平衡与水量平衡的重要参数,遥感技术的发展促进了区域蒸散的研究。基于地表能量平衡方程,SEBAL模型利用遥感影像的可见光、近红外与热红外波段及少量气象数据可计算出区域的日蒸散量,是一个物理概念较为清楚的模型。采用Landsat7 ETM+数据利用SEBAL模型对河北省栾城县进行了遥感蒸散研究,计算获得相关地面特征参数与日蒸散量,模拟结果较为合理。

SEBAL Model and Its Application in the Study of Regional Evapotranspiration

Evapotranspiration is an important parameter in the balance of the earth' s surface energy and water, the development of remote sensing has promoted the study of regional evapotranspiration. Based on the equation of the balance of energy, using remote sensing data including VIS/NIR/TIR and a few of weather data, the SEBAL model can calculate the daily regional evapotranspiration. In this paper, theory、flow and method to retrieve main parameters of this model are expresses in detail, using Landsat7 ETM+ data and SEBAL model, the evapotranspiration of Luancheng County in Hebei Province is studied, we got several surface character parameters and evapotranspiration map in one day. Adopting P-M equation, the quantity of evapotranspiration is 5.64 mm·d-1,the quantity evapotranspiration in sullage-irrigation area retrived from model is 5.4~7.4 mm·d-1,because the soil water and crop situation in sullage-irrigation area are better than others,it shows the result of simulation is in reason.