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首页> 外文期刊>International journal of ecohydrology and hydrobiology >Simulation of evapotranspiration based on leaf area index, precipitation and pan evaporation: A case study of Poyang Lake watershed, China
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Simulation of evapotranspiration based on leaf area index, precipitation and pan evaporation: A case study of Poyang Lake watershed, China

机译：基于叶面积指数，降水和平移蒸发的蒸散探测 - 以鄱阳湖流域为例

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Evapotranspiration (ET) is a major component of land hydrological processes, where it determines the transfer of moisture and energy in the soil-vegetation-atmosphere system. In this study, an empirical ET model (PYH-ET) was established based on the relationships between the monthly ET and the leaf area index (LAI), precipitation (PRE), and pan evaporation (EVP) in the whole Poyang Lake watershed (China). Then, this model was applied to sub-watersheds of the Poyang Lake watershed and analyzed the contributions of the three variables to ET. The results showed that the correlation coefficients between the monthly ET and the monthly LAI, PRE, and EVP were 0.969, 0.380, and 0.894, respectively. The moving average of the PRE per 2 months was used to replace the monthly PRE as a variable in the model. The accuracy of the PHY-ET model was high where the R value for the model was 0.98 and the relative error of the model was 10.2% when the data of 2014 were used to validate the model built according to the data during 2000-2013. The contribution of LAI to ET was highest in all sub-watersheds, followed by EVP, whereas PRE made the lowest contribution. In addition, the contributions of these three factors to ET in this watershed conformed to the law of the minimum, where the variation in ET was limited by the factor with the smallest change. The proposed high accuracy empirical model requires a small number of readily available parameters and it is suitable for integration with hydrological models. (C) 2018 European Regional Centre for Ecohydrology of the Polish Academy of Sciences. Published by Elsevier B.V. All rights reserved.
机译：蒸散（ET）是土地水文过程的主要成分，在那里确定土壤 - 植被 - 大气系统中的水分和能量的转移。在这项研究中，基于每月ET和叶面积指数（LAI），降水（PRE）和PAN蒸发（EVP）之间的关系建立了一个仿真ET模型（PYH-ET）（中国）。然后，该模型应用于鄱阳湖流域的次流域，并分析了三个变量对等的贡献。结果表明，每月et和月莱，前和EVP之间的相关系数分别为0.969,0.380和0.894。前2个月前的移动平均值用于在模型中替换每月预先作为变量。 PHY-ET模型的准确性很高，其中模型的R值为0.98，当使用2014的数据时，模型的相对误差为10.2％，用于验证根据数据的2000-2013期间建立的模型。所有子流域都有最高的莱斯的贡献，其次是EVP，而预先贡献最低。此外，这三个因素在这个流域中的贡献符合最低限度，而ET的变化受到最小变化的因素的限制。所提出的高精度经验模型需要少量的可用参数，并且适用于与水文模型集成。 （c）2018欧洲区域地区生态学科学中心的波兰科学院。 elsevier b.v出版。保留所有权利。

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