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首页> 外文期刊>International journal of remote sensing >Calibration and validation of an aerodynamic method to estimate the spatial variability of sensible and latent heat fluxes over a drip-irrigated Merlot vineyard
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Calibration and validation of an aerodynamic method to estimate the spatial variability of sensible and latent heat fluxes over a drip-irrigated Merlot vineyard

机译：空气动力学方法的校准和验证，以估算滴灌梅洛葡萄园中感热和潜热通量的空间变异性

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摘要

A study was carried out to calibrate and validate the aerodynamic temperature method for estimating the spatial variability of the sensible (H) and latent (LE) heat fluxes over a drip-irrigated merlot vineyard located in the Maule Region, in Chile. For this study, measurement of energy balance components and meteorological data were collected from the 2006 to 2010 growing seasons. The experimental plot was composed of a 4.25 ha of 'Merlot' vineyard, which was equipped with an Eddy-Covariance system and an automatic weather station. The k-fold cross-validation method was utilized to tune and validate a vineyard surface aerodynamic temperature (T-aero) model, considering all of the days when Landsat scenes and ground measurements of meteorological data and surface energy balance (SEB) were available. Then, the satellite-based estimations of Taero were utilized to calculate the surface aerodynamic resistance (r(ah)) and, subsequently, heat fluxes of H and LE. Results indicated that the estimated H and rah values were not significantly different to those measured in the vineyard (95% significance level) showing a root mean square (RMSE) and mean absolute error (MAE) between 34-29 W m(-2) and 1.01-0.78 s m(-1), respectively. Satellite-based computations of LE were somewhat higher than those measured at the time of satellite overpass (RMSE = 63 W m(-2); MAE = 56 W m(-2)), presumably due to the biases embedded in the net radiation (R-n) and soil heat flux (G) computations. The proposed SEB method based on T-aero is very simple to implement, presenting similar accuracies on ET mapping to those computed by complex satellite-based models.
机译：进行了一项校准和验证空气动力学温度方法的研究，该方法用于估算位于智利毛乌尔地区的滴灌梅鹿lot葡萄园上感热（H）和潜热（LE）热通量的空间变异性。在本研究中，收集了2006年至2010年生长季节的能量平衡成分和气象数据。实验地块由4.25公顷的“ Merlot”葡萄园组成，该葡萄园配备了涡流协方差系统和自动气象站。考虑到Landsat气象数据和地面测量以及地表能量平衡（SEB）可用的所有天数，使用k折交叉验证方法来调整和验证葡萄园表面空气动力学温度（T-aero）模型。然后，利用Taero的基于卫星的估计来计算表面空气动力学阻力（r（ah）），然后计算H和LE的热通量。结果表明，估计的H和rah值与在葡萄园中测量的H和rah值（显着性水平为95％）没有显着差异，其均方根（RMSE）和平均绝对误差（MAE）在34-29 W m（-2）之间和1.01-0.78 sm（-1）。 LE的基于卫星的计算要略高于在卫星立交时测量的计算（RMSE = 63 W m（-2）； MAE = 56 W m（-2）），这可能是由于净辐射中嵌入的偏差（Rn）和土壤热通量（G）计算。所提出的基于T-aero的SEB方法实施起来非常简单，在ET映射上表现出与基于复杂卫星模型计算的相似的精确度。

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  • 来源
    《International journal of remote sensing》 |2017年第24期|7473-7496|共24页
  • 作者

    Carrasco-Benavides Marcos; Ortega-Farias Samuel; Morales-Salinas Luis; Poblete-Echeverria Carlos; Chavez Jose L.;

  • 作者单位

    Univ Catolica Maule, Dept Agr Sci, Curico, Chile;

    Univ Talca, Res & Extens Ctr Irrigat & Agroclimatol CITRA, Talca, Chile|Univ Talca, Res Program Adaptat Agr Climate Change PIEI A2C2, Talca, Chile;

    Univ Chile, Lab Res Environm Sci LARES, Santiago, Chile;

    Pontificia Univ Catolica Valparaiso, Escuela Agron, Quillota, Chile|Stellenbosch Univ, Fac AgriSci, Dept Viticulture & Oenol, Stellenbosch, South Africa;

    Colorado State Univ, Dept Civil & Environm Engn, Ft Collins, CO 80523 USA;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
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