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Modification of blaney-morin-nigeria evapotranspiration model for Asaba and Uyo, South-south Nigeria CIGR Journal
Alabi, Habeeb Adedotun; EKECHUKWU nee Umego, Okwunna Maryjane; Ilesanmi, Oluwaseun Ayodele; Ilesanmi, Oluwaseun Ayodele; Ewemoje, Temitayo Abayomi.
The study was designed to re-examine and modify the Blaney-Morin-Nigeria (BMN) evapotranspiration (ET) model which was developed for Asaba and Uyo in South-south of Nigeria. This was achieved using a non-linear iterative technique based on Levenberg-Marquardt algorithm, making use of climatic variables. The newly developed model constants were H = 288.0, m = 0.96; H = 285.8, m = 0.91 and H = 287.0, m = 1.00 for South-south Nigeria, Asaba and Uyo respectively compared to the H = 520.0, m = 1.31 for the original BMN ET model. Data were analysed using different statistical models. The three newly developed BMN models when compared with FAO-56 PM model which was used as standard gave a more satisfactory RET estimates than the original BMN ET model when...
Tipo: Info:eu-repo/semantics/article
Ano: 2023 URL: http://www.cigrjournal.org/index.php/Ejounral/article/view/8521
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Trend Analysis of Reference Evapotranspiration; Case Study of Asaba and Uyo, South-South Nigeria CIGR Journal
Alabi, Habeeb Adedotun; Ewemoje, Temitayo Abayomi; Umego, Okwunna Maryjane.
Temporal trend analysis of monthly mean RET estimates using FAO-56 PM model was performed using the Non-Parametric Mann-Kendall (MK) and Sen’s test for Asaba and Uyo over the period of 41 and 35 years respectively. In Asaba, reference evapotranspiration (RET or ETo) showed an overall increasing trend ranging from MK Z values of 0.80 to 2.93 except for June (-0.75) and September (-1.16) which declined insignificantly. For Uyo, RET showed an insignificant decreasing trend (P>0.1) with MK Z values ranging from -0.09 to -1.65 except for November (0.91) which insignificantly increased at P>0.1. For detailed evaluation of the trends, RET was separated into aerodynamic and radiation terms and their trend analysis were performed. In Asaba, the...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Reference Evapotranspiration (RET); Trends; FAO-56 PM Model; Mann-Kendall; Sen; Meteorological.
Ano: 2020 URL: http://www.cigrjournal.org/index.php/Ejounral/article/view/5859
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