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中国农学通报 ›› 2019, Vol. 35 ›› Issue (14): 101-101.doi: 10.11924/j.issn.1000-6850.casb18030098

• 资源 环境 生态 土壤 气象 • 上一篇    下一篇

基于SEBAL模型的北京市日蒸散发区域分布规律

程明瀚1, 郝仲勇1, 李斌斌1, 缴锡云2   

  1. 1.北京市水科学技术研究院;2.河海大学水利水电学院
  • 收稿日期:2018-03-19 修回日期:2019-04-12 接受日期:2018-10-25 出版日期:2019-05-15 发布日期:2019-05-15
  • 通讯作者: 郝仲勇
  • 基金资助:
    市科委项目“北京城市副中心节水型社会建设关键技术研究与示范”(Z171100004417005);北京市百千万人才工程资助项目(KY-2016-01); 国家重点研发项目“城郊高效安全节水灌溉技术典型示范”(2016YFC0403105);市科委项目“服务业公共建筑节水关键技术集成与示范 (Z171100000717011)”。

Daily Evapotranspiration in Beijing: The Regional Distribution Law Based on SEBAL Model

  • Received:2018-03-19 Revised:2019-04-12 Accepted:2018-10-25 Online:2019-05-15 Published:2019-05-15

摘要: 为了对北京市地表水转换过程中的分量-蒸散发进行定量研究,基于Landsat7 ETM+遥感影像信息并结合气象数据,通过ERDAS构建了SEBAL模型,并通过模型计算得到北京市2014 年7 月26 日的平均蒸散发为2.49 mm,同时利用彭曼公式和MOD16 产品数据对SEBAL 反演结果的可靠性进行验证。结果表明,通过SEBAL 模型计算得到的蒸散发与彭曼公式法和MOD16 数据产品的误差分别为3.2%和3.3%,其结果具有一定的可靠性,且通过Landsat7 数据反演具有数据获取便捷、空间分辨率高的优点。通过对比各区域蒸散发分布,得出北京市蒸散发整体呈现西北山区高、东南平原低的趋势,西北山区林草植被覆盖率较高是导致这一趋势的主要原因。通过统计分析,水域的蒸散发最高,硬化面积及建筑物的蒸散发接近于0,在除去水体及硬化面积后,蒸散发的大小与NDVI呈现极显著的正相关关系,两者的决定系数达到0.9233,故下垫面类型是影响某一时刻区域蒸散发大小的主要因素之一。

关键词: 南疆, 南疆, 果树, 抗污能力

Abstract: To quantitatively study the component-evapotranspiration in the process of surface water conversion in Beijing, we built the SEBAL model through ERDAS based on Landsat7 ETM + remote sensing image information combined with meteorological data, calculated that the average evapotranspiration on July 26, 2014 in Beijing was 2.49 mm, and verified the reliability of the SEBAL inversion results by using the Penman formula and MOD16 product data. The results showed that: the error of evapotranspiration calculated by SEBAL model and Penman’s formula method and MOD16 data product was 3.2% and 3.3%, respectively, which had certain reliability, and the data inversion by Landsat7 had the advantages of convenient data acquisition and high spatial resolution; by comparing the evapotranspiration distribution of each region, it was concluded that the overall evapotranspiration in Beijing was high in the northwest mountainous area and low in the southeast plain which resulted from the high coverage of forest vegetation in the northwest mountainous area; through statistical analysis, the evapotranspiration of the water area was the highest, and that of the hardening area and the building were close to zero; after removing the water body and the hardening area, the