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首页> 外文期刊>International journal of remote sensing >Monthly calibration of Hargreaves-Samani equation using remote sensing and topoclimatology in central-southern Chile
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Monthly calibration of Hargreaves-Samani equation using remote sensing and topoclimatology in central-southern Chile

机译：智利中南部地区使用遥感和地形气候学对Hargreaves-Samani方程进行每月校准

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摘要

Reference evapotranspiration (ETo) has a key role in irrigation scheduling. In this sense, the Hargreaves-Samani equation (HS) is a reliable and widely used method to estimate ETo. The HS equation just requires temperature and solar radiation data, making it a suitable method for places that lack of wind speed and relative humidity information. However, literature shows that a local calibration of its empiric parameter is needed for its complete application. This work shows a calibration for the Maule region in central-southern Chile. For this purpose, the Penman-Monteith equation from FAO-56 (PM) was considered as a reference, using a network of 400 meteorological stations between the 32 degrees and 39 degrees of south latitude for the 1973-2011 period. The calibration was based on the computation of the ratio of ETo calculated by HS and PM and the spatial behaviour of input variables and parameters. The spatial distribution was done by geographical weighted regression and ordinary Kriging with a linear variogram, assisted by a digital elevation model from the Shuttle Radar Topography Mission and surface reflectances from Moderate Resolution Imaging Spectroradiometer. The process of calibration was validated with daily data through all months, with comparative errors of 5% against PM.
机译：参考蒸散量（ETo）在灌溉计划中具有关键作用。从这个意义上讲，Hargreaves-Samani方程（HS）是一种可靠且广泛使用的估算ETo的方法。 HS方程仅需要温度和太阳辐射数据，使其成为缺少风速和相对湿度信息的场所的合适方法。然而，文献表明，对其经验参数的局部校准对于其完整应用是必需的。这项工作显示了智利中南部毛勒地区的标定。为此，使用1973-2011年期间南纬32度至39度之间的400个气象站网络，将粮农组织-56（PM）的彭曼-蒙特斯方程作为参考。校准基于HS和PM计算的ETo比率以及输入变量和参数的空间行为的计算。空间分布是通过地理加权回归和具有线性变异函数的普通Kriging来完成的，并通过航天飞机雷达地形任务的数字高程模型和中分辨率成像光谱仪的表面反射率进行了辅助。校准过程已通过所有月份的每日数据进行了验证，相对于PM的比较误差为5％。

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  • 来源
    《International journal of remote sensing》 |2017年第24期|7497-7513|共17页
  • 作者

    Morales-Salinas Luis; Ortega-Farias Samuel; Riveros-Burgos Camilo; Neira-Roman Jose; Carrasco-Benavides Marcos; Lopez-Olivari Rafael;

  • 作者单位

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

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

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

    Ctr Estudios Avanzados Fruticultura CEAF Conicyt, Rengo, Chile|Univ Chile, Fac Ciencias Agron, Dept Ciencias Ambient & Recursos Nat Renovables, Santiago, Chile;

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

    INIA, Inst Invest Agr, Temuco, Chile;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
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