基于Landsat 8影像的策勒县域典型时期日蒸散量时空分布格局分析

Analysis of Temporal and Spatial Distribution Pattern of Daily Evapotranspiration in Qira County Based on Landsat 8 Images

【目的】估算地表蒸散量有利于水资源合理分配与管理,为水资源可持续发展提供依据。【方法】利用Landsat 8遥感数据集,在ENVI遥感图像处理软件的支持下,结合气温、风速、气压、日照时数等气象数据,应用SEBS模型估算2016年3月27日、5月21日、7月24日、9月10日新疆策勒县的蒸散发量。【结果】估算结果时间上存在秋季<春季<夏季的变化规律,典型季节的4 d蒸散发量分别为:3.885,4.095,4.701和4.511mm/d;其空间变化趋势为:北部荒漠区<南部山区<中部平原区。【结论】利用彭曼公式计算的结果与对SEBS的估算结果进行比较,SBES模型的结果是合理的。

[ Objective] The estimation of surface evapotranspiration is beneficial to the rational allocation and management of water resources, which might provide the basis for the sustainable development of water re-sources .[ Method] By using the Landsat 8 remote sensing data set, With the support of the ENVI remote sens-ing image processing software, combined with the air temperature, air pressure, wind speed, sunshine dura-tion and other meteorological data, evapotranspiration was estimated by SEBS model in March 27th , May 21st, July 24th and September 10th 2016 in Xinjiang Qira County.[ Result] The results could reflect season change; for instance, the results of farmland were 3. 885, 4. 095, 4. 701, 4. 511 mm/day on four days respectively. The overall trend was the northern desert plain 〈 the southern mountains 〉 the central region.[ Conclusion] The results of SEBS estimation are compared with those calculated by Penman formula, which shows that the results of SBES model are reasonable.