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首页> 外文期刊>Journal of hydrometeorology >Temporal Upscaling of Rice Evapotranspiration Based on Canopy Resistance in a Water-Saving Irrigated Rice Field
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Temporal Upscaling of Rice Evapotranspiration Based on Canopy Resistance in a Water-Saving Irrigated Rice Field

机译：基于树冠抗灌溉稻田冠层抗覆盆子的水稻蒸发术的时间升高

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摘要

An important element of the hydrologic cycle, the hydrometeorological parameter of evapotranspiration (ET), is critical in the development of effective water resources planning and irrigation scheduling. The ET varies in response to changes in resistance at the canopy surface r(c) and soil moisture content theta, especially under water-saving irrigation (WSI) practices. Drawing on data collected by eddy covariance in WSI rice paddies in eastern China in 2015 and 2016, variations in ET were studied by calculating and analyzing hourly canopy resistance r(c)(h) and daily canopy resistance r(c)(d). Discrepancies were noted between true daily ET (ETtrd) with respect to the estimated daily ET (ETrcd) at different periods [0700-1600 local time (UTC + 8)]. To estimate ETrcd, in the WSI rice fields, the mean r(c)(h) value between 0900 and 1000 LT, and between 1000 and 1100 LT performed considerably better than r(c)(h) for a single time. Seasonal estimated ET (ETrcs) can be accurately calculated by interpolating r(c)(d) at different time intervals, thereby achieving a greater correlation and consistency at 2-day intervals. Then a generalized two-segment line of rd variation was used to calculate ETrcs, achieving good results and showing that in the absence of observational data, ETrcs, could be easily calculated through a simplified pattern of variability. In conclusion, an ET temporal upscaling method for a WSI paddy, based on variation in r(c)(h) and r(c)(d) values, was optimized and is recommended for local application. Future work will focus on temporal upscaling of ET by extrapolating remote sensing instantaneous estimates to daily values.
机译：蒸散量（ET）是水文循环的一个重要组成部分，是制定有效水资源规划和灌溉计划的关键。ET随冠层表面阻力r（c）和土壤含水量θ的变化而变化，尤其是在节水灌溉（WSI）措施下。利用2015年和2016年在中国东部WSI稻田中通过涡度协方差收集的数据，通过计算和分析每小时冠层阻力r（c）（h）和每日冠层阻力r（c）（d）来研究ET的变化。在不同时期[当地时间0700-1600（UTC+8）]的实际每日ET（ETtrd）与估计每日ET（ETrcd）之间存在差异。为了估算ETrcd，在WSI稻田中，0900和1000 LT之间以及1000和1100 LT之间的平均r（c）（h）值在一次试验中表现得比r（c）（h）好得多。通过在不同的时间间隔内插值r（c）（d），可以准确计算季节性估计ET（ETRC），从而在两天的时间间隔内实现更大的相关性和一致性。然后，使用广义的两段rd变异线计算ETRC，取得了良好的结果，并表明在缺乏观测数据的情况下，可以通过简化的变异模式轻松计算ETRC。综上所述，基于r（c）（h）和r（c）（d）值的变化，对WSI水稻的ET时间放大方法进行了优化，并推荐用于当地应用。未来的工作将侧重于通过将遥感瞬时估计值外推到每日值来提高ET的时间尺度。

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  • 来源
    《Journal of hydrometeorology》 |2020年第7期|共16页
  • 作者

    Liu Xiaoyin; Xu Junzeng; Yang Shihong; Lv Yuping; Zhuang Yang;

  • 作者单位

    Hohai Univ Coll Agr Sci &

    Engn Nanjing Jiangsu Peoples R China;

    Hohai Univ Coll Agr Sci &

    Engn Nanjing Jiangsu Peoples R China;

    Hohai Univ Coll Agr Sci &

    Engn Nanjing Jiangsu Peoples R China;

    Yangzhou Univ Coll Hydraul Sci &

    Engn Yangzhou Jiangsu Peoples R China;

    Changzhou City Urban Flood Control Project Manage Changzhou Jiangsu Peoples R China;

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  • 正文语种 eng
  • 中图分类 水文循环与水文气象;
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