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蒸散发是水量平衡和能量平衡的重要环节,传统的计算方法只能以点为基础进行计算。为排除蒸散发空间变异特性的影响,在遥感技术的基础上,引入了基于地表能量平衡原理的SEBAL模型,对别拉洪河流域典型生态系统的日蒸散情况进行了计算模拟,获取了相关地面特征参数及日蒸散量,并根据地表实测温度和涡度相关系统测量的蒸散量对遥感估算结果进行了验证,验证结果表明2008年三期估算结果的地表温度误差分别为1.57K、0.72K、1.73K左右,2006年一期估算蒸散量的误差为12.86%,说明SEBAL模型的精度能够满足蒸散量遥感估算的要求。在此基础上,结合土地利用数据分析了研究区不同土地利用方式下的蒸散量分布情况。结果表明不同土地利用下的日蒸散量并不相同,其中水体和植被覆盖较好的地区的蒸散量较高,而没有灌溉措施的旱田的蒸散量较低。不同生态系统日蒸散量的空间分布不仅和灌溉条件有一定关系,而且也受气候条件的制约。
Evapotranspiration is an important part of water balance and energy balance. The traditional calculation method can only calculate on a point-by-point basis. Based on the remote sensing technology, the SEBAL model based on the surface energy balance principle was introduced to calculate the daily evapotranspiration of typical ecosystems in the Bielahong basin, and the relevant ground Characteristic parameters and daily evapotranspiration. The results of remote sensing estimation are validated based on the measured evapotranspiration measured by the measured surface temperature and the eddy covariance system. The results show that the surface temperature errors of the estimated results of the third phase of 2008 are 1.57K and 0.72K, About 1.73K, the estimated error of evapotranspiration in 2006 is 12.86%, which shows that the accuracy of SEBAL model can meet the requirements of evapotranspiration estimation. On this basis, the distribution of evapotranspiration under different land use patterns in the study area was analyzed based on the land use data. The results showed that the daily evapotranspiration was not the same under different land use, and the evapotranspiration was higher in the areas with better water bodies and vegetation cover, while the evapotranspiration was lower in dryland without irrigation measures. The spatial distribution of evapotranspiration on different ecosystems is not only related to the irrigation conditions, but also to the climatic conditions.