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复杂地形条件下和干旱半干旱植被稀疏条件下的蒸散发遥感估算一直是蒸散发区域遥感估算的难点、热点问题。针对黄土丘陵沟壑区地表起伏、覆被不均一、植被稀疏的特征,选择陕甘交界区为研究区,利用Landsat TM资料求取地表特征参数和地表能量平衡各参量,采用TSEB平行模型反演出该区域的瞬时土壤蒸发、植被蒸腾和土壤—植被总蒸散发量,经过尺度转换,得到日蒸散量;并利用附加阻抗法和FAO Penman-Monteith公式计算实际蒸散发,对TSEB平行模型法遥感估算结果进行了间接精度评价,比较验证结果表明TSEB平行模型法估算的蒸散发结果合理,精高较高。
Remote sensing estimation of evapotranspiration under complicated terrain conditions and arid and semi-arid vegetation sparseness has been a difficult and hot issue in remote sensing estimation of evapotranspiration. According to the characteristics of surface undulation, uneven coverage and sparse vegetation in loess hilly and gully regions, the boundary between Shaanxi and Gansu was selected as the study area. Landsat TM data were used to calculate the surface characteristic parameters and surface energy balance parameters. The TSEB parallel model was used to inverse Instantaneous soil evaporation, vegetation transpiration and soil-vegetation total evapotranspiration in the region were calculated and converted to daily evapotranspiration. The actual evapotranspiration was calculated by the additional impedance method and the FAO Penman-Monteith formula. The remote sensing estimation results of the TSEB parallel model method Indirect accuracy was evaluated. The comparison and verification results showed that the results of evapotranspiration estimated by TSEB parallel model method were reasonable and the precision was high.