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首页> 外文会议>Remote sensing for agriculture, ecosystems, and hydrology XIX >Assessing actual evapotranspiration via surface energy balance aiming to optimize water and energy consumption in Large Scale Pressurized Irrigation Systems
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Assessing actual evapotranspiration via surface energy balance aiming to optimize water and energy consumption in Large Scale Pressurized Irrigation Systems

机译：通过表面能平衡评估实际的蒸散量，旨在优化大型加压灌溉系统中的水和能源消耗

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Satellite imagery provides a dependable basis for computational models that aimed to determine actual evapotranspiration (ET) by surface energy balance. Satellite-based models enables quantifying ET over large areas for a wide range of applications, such as monitoring water distribution, managing irrigation and assessing irrigation systems' performance. With the aim to evaluate the energy and water consumption of a large scale on-turn pressurized irrigation system in the district of Aguas Nuevas, Albacete, Spain, the satellite-based image-processing model SEBAL was used for calculating actual ET. The model has been applied to quantify instantaneous, daily, and seasonal actual ET over high-resolution Landsat images for the peak water demand season (May to September) and for the years 2006 - 2008. The model provided a direct estimation of the distribution of main energy fluxes, at the instant when the satellite overpassed over each field of the district. The image acquisition day Evapotranspiration (ET_(24)) was obtained from instantaneous values by assuming a constant evaporative fraction (A) for the entire day of acquisition; then, monthly and seasonal ET were estimated from the daily evapotranspiration (ET_(daily)) assuming that ET_(24) varies in proportion to reference ET (ET_r) at the meteorological station, thus accounting for day to day variation in meteorological forcing. The comparison between the hydrants water consumption and the actual evapotranspiration, considering an irrigation efficiency of 85%, showed that a considerable amount of water and energy can be saved at district level.
机译：卫星图像为旨在通过表面能平衡确定实际蒸散量（ET）的计算模型提供了可靠的基础。基于卫星的模型能够对大范围的ET进行量化，以用于各种应用，例如监视水分配，管理灌溉和评估灌溉系统的性能。为了评估西班牙阿尔巴塞特市阿瓜斯·努埃瓦斯地区的大型开启式增压灌溉系统的能源和水消耗，将基于卫星的图像处理模型SEBAL用于计算实际ET。该模型已被用于量化高峰需求季节（5月至9月）以及2006-2008年高分辨率Landsat图像上的瞬时，每日和季节性实际ET。该模型直接估算了ET的分布。主要能量通量，在卫星越过该区域的每个场的瞬间。图像采集日蒸发蒸腾量（ET_（24））是通过假设整个采集日的蒸发分数（A）恒定而从瞬时值获得的；然后，假设ET_（24）与气象站的参考ET（ET_r）成比例变化，则根据每日蒸散量（ET_（daily））估算每月和季节性ET，从而解释了气象强迫的日常变化。考虑到85％的灌溉效率，对消防栓耗水量与实际蒸散量的比较表明，在区域一级可以节省大量的水和能源。

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