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首页> 外文会议>Conference on Remote Sensing for Agriculture, Ecosystems, and Hydrology >Comparison between energy balance and mass balance models for actual evapotranspiration assessment
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Comparison between energy balance and mass balance models for actual evapotranspiration assessment

机译：实际蒸散评估能量平衡与质量平衡模型的比较

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The assessment of the water needs for a specific crop has a fundamental importance in the management of water resources. The application of empirical models able to retrieve estimates of the actual evapotranspiration (ET_a) to assess the need for water could give a valid tool for the planning of water supply, avoiding unnecessary water losses. In this context, two independent models for estimating actual evapotranspiration were compared. The first model is based on an energy balance and uses remotelysensed data and ancillary data from weather stations to assess the ETa. The second model also uses remotely sensed data and climatic data on a daily basis from a weather network. Field measurements are needed to calibrate both models. The study was conducted in a commercial vineyard located in Napa Valley (California). The observed range of ET_(daily) is included within the values measured by other authors. The results retrieved from both models show actual ET_(daily) values with a different trend overtime; after mid-summer (early July) VSIM estimates of ET_(daily) trend downwards, while SEBAL estimates remain fairly constant. This disagreement illustrate the difficulty in estimating the actual evapotranspiration at the end of season, when soil moisture gets low and vine water stress increases due to reducing stomatal conductance.
机译：对特定作物的水需求的评估对水资源管理有根本重要性。实证模型的应用能够检索实际蒸散（ET_A）的估计，以评估水的需求，可以为水供应提供有效的工具，避免不必要的水损失。在这种情况下，比较了两个用于估算实际蒸散蒸腾的独立模型。第一个模型基于能量平衡，并使用远程远程站的远程数据和辅助数据来评估ETA。第二种模型还从天气网络每天使用远程感测数据和气候数据。需要现场测量来校准两种型号。该研究是在位于纳帕谷（加利福尼亚州）的商业葡萄园进行。观察到的ET_（每日）范围包括在其他作者测量的值内。从两种模型中检索的结果显示了具有不同趋势加班的实际ET_（每日）值;在夏季中午（初期）之后（7月初）VSIM估计的ET_（每日）趋势向下，而Sebal估计仍然相当不变。这种分歧说明了难以估计季节结束时的实际蒸散蒸腾，当土壤水分降低而葡萄水胁迫因降低气孔导量而增加。

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