摘要
本文利用MODIS数据,采用SEBS模型的计算方法,结合气象站的实际观测资料,得到海河流域2010年春季、夏季、秋季和冬季的地表反照率、归一化植被指数、瞬时潜热通量和日蒸散量的反演分布图;同时利用传统的Penman-Monteith公式,计算了海河流域近50年的年际和季节的日平均参考作物腾发量(ET0),对其进行了时空分析。时间上,海河流域近50年ET0变化不大,整体呈现下降趋势,四季中,夏季ET0最高,其次是春季、秋季和冬季。空间上,海河流域年际ET0变化显著,整体呈现由东南向西北方向递减趋势;春、夏、秋、冬四个季节整体都呈现出由东南向西北递减趋势。并对遥感反演的精度进行验证,误差大约在10%左右,遥感反演结果合理可靠。
Based on the surface energy balance system, we inverted the ET value for the Haihe basin in 2010 using MODIS data, the SEBS model-method and practical observation data from weather stations. We calculated the ET value by combining the traditional Penman-Monteith formula with surface meteorological data for the Haihe River basin, and verified the results of the remote sensing module. The ET value showed an overall trend of increasing from north to south regarding seasonal variation, and converged on the spatial distribution that reflected periodicity.The summer ET value is highest, winter ET value is lowest, and the autumn and spring values are similar. According to 26 sites and 50 years of meteorological data across the Haihe River basin from 1961 to 2010, we calculated annual and seasonal average daily OET based on the PenmanMonteith model and conducted temporal and spatial analysis. There is steady variation of ET0 in the Haihe River basin; from the aspect of space, interannual changes in ET0 are significant and present a decreasing trend from southeast to northwest. Summer ET0 was the highest and shows a declining trend of four seasons from southeast to northwest. The lowest ET0 values are mainly located in mountain-areas. The result of accuracy validation in remote sensing inversion using the Penman-Monteith formula is reasonable and reliable, and the range of error value is approximately10%.
出处
《资源科学》
CSSCI
CSCD
北大核心
2014年第7期1489-1500,共12页
Resources Science
基金
水沙科学与水利水电工程国家重点实验室2012年对外开放研究基金(编号:sklhse-2012-A-02)
辽宁省高等学校杰出青年学者成长支持计划支持项目(编号:LJQ2012092)
国家自然科学基金项目(编号:51279072)
