Calibration of the hydrological model GR4J from potential evapotranspiration estimates by the Penman-Monteith and Oudin methods in the Ouémé watershed (West Africa)

Calibration of the hydrological model GR4J from potential evapotranspiration estimates by the Penman-Monteith and Oudin methods in the Ouémé watershed (West Africa)
复制标题

根据韦梅流域（西非）的 Penman-Monteith 和 Oudin 方法估计的潜在蒸散量来校准水文模型 GR4J

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发表时间：
2020
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通讯作者：
C. Houndénou
C. Houndénou
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作者：
Domiho Japhet Kodja;A. J. S. Akognongbé;E. Amoussou;G. Mahé;E. Vissin;J. Paturel;C. Houndénou

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抽象的。贝特罗和博努的韦梅流域最近对洪水或干旱事件造成的极端水文气候现象越来越敏感。与此同时，人口增长和相关的 社会经济活动增加了对水资源的压力。 在此背景下，水文模拟是一个重要的问题，本研究 目的是分析水文模型GR 4J基于 PET Penman-Monteith和Oudin方法。日降雨量，Penman-Monteith和 Oudin蒸散量和Beterou河的每日数据流， 在韦梅盆地建立了博努水文站 在1971年至2010年期间的GR 4J模型中。Oudin PET值为 略高于Penman-Monteith PET。不过不同的 两种PET方法之间的差异对优化的影响很小， GR 4J模型的性能标准。纳什值的范围从0.83到 0.91在Bonou的校准为0.52至0.70，在Beterou的校准为0.52至0.70， 干燥期，而在验证中，Beterou中为0.59至0.78， 丰水期博努为0.56 ~ 0.88。鉴于这些结果， 所使用的两种PET方法不是由相同的气候变量产生的， 应该说，PET的配方对生产的影响很小， 这些热带盆地的GR 4J结果。
Abstract. The Oueme watersheds at Beterou and Bonou has been recently facing increased sensitivity to extreme hydroclimatic phenomena that occurred by flooding or drought events. In the same time, the population growth and the related socio-economic activities increased the pressure state on water resources. In this context, hydrological modeling is an important issue and this study aims at analyzing the calibration of the hydrological model GR4J based on PET Penman-Monteith and Oudin methods. Daily rainfall, Penman-Monteith and Oudin evapotranspiration and daily data flow from the Beterou and Bonou hydrometric stations on the Oueme Basin have been implemented in the GR4J model over the period 1971 to 2010. Oudin PET values are slightly higher than the Penman-Monteith PET ones. However, the difference between the two PET methods have only few impacts on the optimization and performance criteria of the GR4J model. The Nash values ranges from 0.83 to 0.91 in Bonou, and 0.52 to 0.70 in Beterou for the calibration in dry period, while in validation, they are 0.59 to 0.78 in Beterou, and 0.56 to 0.88 in Bonou in wet season. In view of these results, with the two PET methods used which do not result from the same climatic variables, it should be said that the formulation of PET has only few impacts on the results of GR4J for these tropical basins.