Sensible and Latent Heat Flux Estimation in Tea Fields Using

发布时间：2021-06-24 15:53

　　灌溉用水对农业生产至关重要,提高用水效率是节约用水的关键。准确估算腾发量（ET）对灌溉制度的规划和高效利用现有水资源是十分必要的。在中国,茶是最主要的饮料之一。为了提高茶叶产量,需要通过最优的腾发量估算方法来实现合理的灌溉管理。估算腾发量的方法包括涡度协方差（EC）法、波文比（BR）和蒸渗仪法。但是,以上方法由于存在仪器贵重、操作和数据处理复杂、对风区和测量精度要求高等缺点,大多无法用于日常田间使用。为克服上述问题,有研究提出了用表面更新（SR）法和通量方差（FV）法先来计算显热通量（H）和潜热通量（LE）,然后结合净辐射（Rn）和土壤热通量（G）的测量,从而获得对腾发量的估算。这两种方法由于只使用低成本的细小金属丝热电偶来高频率的测量空气温度,因而成本低且操作简便。本研究以江苏丹阳的一个茶园为对象,大约一年的试验过程包括了不同的季节和气候变化。采用上述两种方法对显热通量和潜热通量估算及分析,并与涡度协方差法进行比较。重点研究了不同风区长度和气温测点高度对使用FV法估算显热通量和潜热通量精度的影响。主要的研究内容和结果如下:1利用表面更新（SR）法估算茶园显热通量试验茶园位于北纬32.... 

【文章来源】：江苏大学江苏省

【文章页数】：117 页

【学位级别】：博士

【文章目录】：
ABSTRACT
摘要
NOMENCLATURE
CHAPTER 1 Introduction
    1.1 Research Background,Aim and Significance
    1.2 Current surface fluxes measurement methods
    1.3 General Objectives
    1.4 Dissertation Layout
CHAPTER 2 Literature Review
    2.1 Fundamental of the atmospheric boundary layer
    2.2 Energy balance closure in the atmospheric boundary layer
        2.2.1 Latent heat flux
        2.2.2 Net radiation
        2.2.3 Soil heat flux
        2.2.4 Sensible heat flux
    2.3 Development of the Surface renewal method
        2.3.1 Application of the surface renewal method
    2.4 Development of the Flux variance method
        2.4.1 Application of the flux variance method
    2.5 Principle of Eddy covariance method
    2.6 Summary
CHAPTER 3 Estimation of Sensible and Latent Heat Fluxes using Surface Renewal Method
    3.1 Introduction
    3.2 Material and methods
        3.2.1 Study site and climate
        3.2.2 Surface renewal(SR)method
    3.3 Results and discussion
        3.3.1 Energy balance closure
        3.3.2 Sensible heat flux
        3.3.3 Latent heat flux
    3.4 Summary
CHAPTER 4 Fetch Effect on Flux Variance Estimations of Sensible and Latent Heat Fluxes
    4.1 Introduction
    4.2 Materials and Methods
        4.2.1 Study site and climate features
        4.2.2 The field experiments
        4.2.3 Flux variance method
        4.2.4 Footprint analysis
        4.2.5 Evaluation criteria
        4.2.6 Possible error sources
    4.3 Results and discussion
        4.3.1 The footprint of EC flux measurements
        4.3.2 Energy balance closure analysis
        4.3.3 Sensible heat flux comparison
        4.3.4 Latent heat flux estimation
    4.4 Discussion
    4.5 Summary
CHAPTER 5 Effect of Air Temperature Measurement Height on Flux Variance Estimations of Sensible heat flux
    5.1 Introduction
    5.2 Materials and methods
        5.2.1 Environmental conditions
    5.3 Results and discussion
        5.3.1 Eddy covariance measurements
        5.3.2 Sensible heat flux
        5.3.3 Latent heat flux
    5.4 Summary
CHAPTER 6 Long-term Estimation of Sensible and Latent Using Flux Variance Method
    6.1 Introduction
    6.2 Material and methods
        6.2.1 Study site
        6.2.2 Micrometeorological measurements
        6.2.3 Fetch and wind direction
    6.3 Results and Discussion
        6.3.1 Climatic conditions
        6.3.2 Energy balance closure
        6.3.3 Sensible heat flux
        6.3.4 Latent heat flux
        6.3.5 Seasonal estimates of the energy balance components
        6.3.6 Footprint analysis of the EC system
    6.4 Summary
CHAPTER 7 General Conclusions,Key findings and Future Prospective
    7.1 General conclusion
        7.1.1 Estimation of sensible and latent heat fluxes using Surface Renewal method
        7.1.2 Fetch effect on Flux variance estimation of sensible and latent heat fluxes
        7.1.3 Effect of air temperature measurement height on Flux variance
        7.1.4 Long-term estimation of sensible and latent heat fluxes with Flux variance method
    7.2 Key findings
    7.3 Future prospective
References
Acknowledgements
Publications
ANNEX


【参考文献】：
期刊论文
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