集成热红外和微波遥感的农田蒸散估算方法研究

项目名称： 集成热红外和微波遥感的农田蒸散估算方法研究

项目编号： No.41201331

项目类型： 青年科学基金项目

立项/批准年度： 2013

项目学科： 地理学

项目作者： 姚云军

作者单位： 北京师范大学

项目金额： 25万元

中文摘要： 针对单独采用可见光、近红外、热红外或微波波段很难实现对农田蒸散高时效、全天候和全天时综合估算这一科学问题。本课题从土壤-作物能量平衡理论角度入手，以电磁波辐射传输机制以及地物微波散射机制研究为主线，利用Penman-Monteith蒸散模型，从热红外和微波遥感两个层面分别探索土壤阻抗以及作物冠层阻抗与电磁波的定量关系，阐明农田蒸散与电磁波作用机理，集成热红外和微波遥感信息，构建全天候的农田蒸散综合遥感估算方法。同时，利用中国北方农田通量观测站点（馆陶、大兴等）数据，开展一系列遥感蒸散模型的验证工作，并进一步修正与改进蒸散算法，提高模拟效果，为国家水资源管理和地表干旱监测提供技术支持。

中文关键词： 热红外遥感；微波遥感；蒸散；Priestly-Taylor 模型；

英文摘要： Considering the difficulty of highly efficient,all-weather and all-time farmland evapotranspiration (ET) estimation using single visible, near infrared, thermal infrared or microwave remote sensing data, this proposal has been put forward based on the theory of the soil -crop energy budget, the mechanism of electromagnetic radiation transmission and microwave scattering, to analyze the quantitative relationship of the soil resistance, crop canopy resistance and electromagnetic waves, using Penman-Monteith ET model, thermal infrared and microwave remote sensing. This project will illustrate the mechanism between farmland ET and electromagnetic waves, and further to develop all-weather farmland ET estimation method using remotely sensed data. Meantime, a series of validation for this model has been carried out using farmland flux observation data (Guantao, Daxing, etc.) over northern China, and further amended to improve ET algorithm to improve the simulation accuracy to provide technical support for water resources management and surface drought monitoring.

英文关键词： Thermal infrared remote sensing；microwave remote sensing；evapotranspiration；Priestly-Taylor ET model；