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表面能量平衡系统是应用卫星对地观测的可见光、近红外和热红外波段资料,结合实测气象数据或大气模式输出数据,根据表面能量平衡原理估算不同尺度的地表大气湍流通量,从而估算地表相对蒸散的一种方法。本文将水文数据与遥感数据相结合,对张掖盆地1990-2004年间的区域蒸散量进行了估算,评价了区域蒸散的年际变化规律,并对其影响因素进行了分析。结果表明:张掖盆地的区域蒸散量呈逐年升高的趋势,这种增长趋势与黑河中游莺落峡、正义峡间的耗水量增加,张掖地区人口、GDP的增长及农田用地的增加有着良好的相关性。
The surface energy balance system is based on visible, near-infrared and thermal infrared data of satellite earth observation. Combined with the measured meteorological data or atmospheric model output data, the surface turbulence fluxes of different scales are estimated according to the surface energy balance principle to estimate the relative A method of evapotranspiration. In this paper, hydrological data and remote sensing data are combined to estimate the regional evapotranspiration during the period from 1990 to 2004 in Zhangye basin. The interannual variability of regional evapotranspiration is evaluated and the influencing factors are analyzed. The results show that the regional evapotranspiration of Zhangye basin tends to increase year by year. The trend of this increase is in line with the increase of water consumption in Yingluo Falls and Zhengyixiages in the middle reaches of the Heihe River, the increase of population and GDP and the increase of farmland in Zhangye, Correlation.