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冰川冻土 ›› 2014, Vol. 36 ›› Issue (6): 1538-1547.doi: 10.7522/j.issn.1000-0240.2014.0184

• 寒旱区水文水资源 • 上一篇    下一篇

基于涡动相关仪验证的SEBS模型对黑河中游地表蒸散发的估算研究

吴雪娇1,2, 周剑1, 李妍3, 潘晓多1, 周彦召1,2   

  1. 1. 中国科学院 寒区旱区环境与工程研究所, 甘肃 兰州 730000;
    2. 中国科学院大学, 北京 100049;
    3. 兰州大学 信息科学与工程学院, 甘肃 兰州 730000
  • 收稿日期:2014-05-05 修回日期:2014-08-31 发布日期:2015-01-20
  • 作者简介:吴雪娇(1986-),女,黑龙江五大连池人,2012年在中国科学院寒区旱区环境与工程研究所获硕士学位,现为在读博士研究生,主要从事寒区旱区遥感与地理信息系统应用研究.E-mail:wxjiao608@126.com
  • 基金资助:
    甘肃省科技计划国际合作专项(1204WCGA013); 国家自然科学基金项目(91125023; 41190084)资助

Estimating the evapotranspiration in the middle reaches of the Heihe River by SEBS model based on the eddy covariance system

WU Xuejiao1,2, ZHOU Jian1, LI Yan3, PAN Xiaoduo1, ZHOU Yanzhao1,2   

  1. 1. Cold and Arid Regions Environmental and Engineering Research Institute, Chinese Academy of Sciences, Lanzhou 730000, China;
    2. University of Chinese Academy of Sciences, Beijing 100094, China;
    3. School of Information Science and Engineering, Lanzhou University, Lanzhou 730000, China
  • Received:2014-05-05 Revised:2014-08-31 Published:2015-01-20

摘要: 在我国西北干旱和半干旱地区, 农业收获主要依靠灌溉保证, 灌溉绿洲的蒸散发(ET)是当地水资源的主要消耗. 通过遥感估算区域灌溉绿洲的ET对于地区合理利用水资源极其重要, 利用MODIS/Terra 影像, 基于物理过程的地表能量平衡模型(SEBS), 结合WRF模式输出的气候驱动数据和地面观测数据来估算黑河中游地区的地表通量和日蒸散发(ETdaily). 估算的ET用不同下垫面的涡动相关仪观测数据进行验证, 结果显示: SEBS模型估算的不同下垫面的ETdaily具有很好的拟合效果(R2=0.96, P<0.001), 在灌溉绿洲估算的ETdaily比实测值偏高, 说明干旱、半干旱地区灌溉绿洲土壤水分胁迫是影响ET的主要因素. 模型估算绿洲作物生长期间的ETdaily和实测的ETdaily平均相对误差为12.5%, 精度在观测的能量不闭合误差以内且精度比戈壁和沙漠地区高.

关键词: MODIS, 蒸散发, 地表通量, 空间异质性, 黑河中游

Abstract: Irrigated oasis is the primary water consumer in semi-arid and arid regions of Northwest China. Correctly estimating the evapotranspiration (ET) of irrigation oasis through remote sensing is of prime importance for studying the water resources in this region. The Surface Energy Balance System (SEBS) model based on physical processes has been developed to estimate the land surface fluxes by using remotely sensed data and available meteorological observations. In this study, together with MODIS/Terra images, in combination of climate forcing data derived from Weather Research and Forecasting (WRF) model, the SEBS model was utilized to estimate the evapotranspiration and other surface fluxes over the middle reaches of the Heihe River, Northwest China. The estimated daily evapotranspiration (ETdaily) was validated by using measurement of ET with eddy covariance (EC) system in different landscapes (oasis, gobi, and desert). The results show that the estimated ETdaily agrees with the measured ETdaily very well (R2=0.96, P<0.001), and the estimated ETdaily is a little higher than that measured in irrigation oasis, demonstrating soil water stress is the primary factor affecting ET on irrigation oasis in semi-arid and arid regions. The mean error is 0.76 between estimated ETdaily and measured ETdaily in irrigation oasis during crop growth period, with mean relative error of 12.5%, which is better than that in gobi and desert regions.

Key words: MODIS, evapotranspiration, surface flux, spatial heterogeneity, middle reaches of the Heihe River

中图分类号: 

  • S161.4