Wind Turbulence Intensity Characteristics at 10m Above Ground Along the Cotonou Coast, Benin

Hagninou Elagnon Venance Donnou; Aristide Barthélémy Akpo; Julien Djossou; Basile Bruno Kounouhewa

doi:doi:10.11648/j.ijrse.20190804.11

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Wind Turbulence Intensity Characteristics at 10m Above Ground Along the Cotonou Coast, Benin

Hagninou Elagnon Venance Donnou, Aristide Barthélémy Akpo, Julien Djossou, Basile Bruno Kounouhewa

Published in International Journal of Sustainable and Green Energy (Volume 8, Issue 4)

Received: 14 October 2019 Accepted: 12 November 2019 Published: 25 November 2019

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Abstract

The characteristics of the wind turbulence intensity that are essential to know before installing a wind turbine at a site were investigated along the coast of Cotonou in Benin. The average speed, direction, roughness length, friction velocity, turbulence intensity and relationship between the roughness and wind turbulence intensity were evaluated as well. Using the estimators derived from a simple isotropic Gaussian model of turbulent wind fluctuations, we proposed modified models for estimating the turbulence intensity of wind components. Wind speed and direction data recorded at 10 m above ground level from 2011 to 2014 during the first Compact of the Millennium Challenge Account (MCA) in Benin were utilized. The results obtained indicated that the annual average roughness length is evaluated at 1.25×10^-4 m, and the annual mean friction velocity is equal to 0.41 m.s^-1. Peak values of the turbulence intensity vary from 0.3 to 0.6 except during the months of January, April, July, August and September. The high values obtained could jeopardize the production of wind energy during these months. The correlation between the turbulence intensity and roughness length ranging from 0.75 in January to 0.94 in August revealed that these two parameters are linked by an increasing linear function. Finally, modified formulations of the longitudinal and transversal wind turbulence intensity developed from the van den Hurk and de Bruin model and based on the best-fitting approach were proposed. The error estimators (MAE; RMSE) computed to validate these modified models vary respectively from (0.0099; 0.0141) to (0.0614; 0.0890).

Published in	International Journal of Sustainable and Green Energy (Volume 8, Issue 4)
DOI	10.11648/j.ijrse.20190804.11
Page(s)	65-80
Creative Commons	This is an Open Access article, distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution and reproduction in any medium or format, provided the original work is properly cited.
Copyright	Copyright © The Author(s), 2024. Published by Science Publishing Group

Keywords

Turbulence Intensity, Surface Roughness Length, Friction Velocity, Modified Estimators

References

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Hagninou Elagnon Venance Donnou, Aristide Barthélémy Akpo, Julien Djossou, Basile Bruno Kounouhewa. (2019). Wind Turbulence Intensity Characteristics at 10m Above Ground Along the Cotonou Coast, Benin. International Journal of Sustainable and Green Energy, 8(4), 65-80. https://doi.org/10.11648/j.ijrse.20190804.11

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Hagninou Elagnon Venance Donnou; Aristide Barthélémy Akpo; Julien Djossou; Basile Bruno Kounouhewa. Wind Turbulence Intensity Characteristics at 10m Above Ground Along the Cotonou Coast, Benin. Int. J. Sustain. Green Energy 2019, 8(4), 65-80. doi: 10.11648/j.ijrse.20190804.11

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Hagninou Elagnon Venance Donnou, Aristide Barthélémy Akpo, Julien Djossou, Basile Bruno Kounouhewa. Wind Turbulence Intensity Characteristics at 10m Above Ground Along the Cotonou Coast, Benin. Int J Sustain Green Energy. 2019;8(4):65-80. doi: 10.11648/j.ijrse.20190804.11

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@article{10.11648/j.ijrse.20190804.11,
  author = {Hagninou Elagnon Venance Donnou and Aristide Barthélémy Akpo and Julien Djossou and Basile Bruno Kounouhewa},
  title = {Wind Turbulence Intensity Characteristics at 10m Above Ground Along the Cotonou Coast, Benin},
  journal = {International Journal of Sustainable and Green Energy},
  volume = {8},
  number = {4},
  pages = {65-80},
  doi = {10.11648/j.ijrse.20190804.11},
  url = {https://doi.org/10.11648/j.ijrse.20190804.11},
  eprint = {https://article.sciencepublishinggroup.com/pdf/10.11648.j.ijrse.20190804.11},
  abstract = {The characteristics of the wind turbulence intensity that are essential to know before installing a wind turbine at a site were investigated along the coast of Cotonou in Benin. The average speed, direction, roughness length, friction velocity, turbulence intensity and relationship between the roughness and wind turbulence intensity were evaluated as well. Using the estimators derived from a simple isotropic Gaussian model of turbulent wind fluctuations, we proposed modified models for estimating the turbulence intensity of wind components. Wind speed and direction data recorded at 10 m above ground level from 2011 to 2014 during the first Compact of the Millennium Challenge Account (MCA) in Benin were utilized. The results obtained indicated that the annual average roughness length is evaluated at 1.25×10-4 m, and the annual mean friction velocity is equal to 0.41 m.s-1. Peak values of the turbulence intensity vary from 0.3 to 0.6 except during the months of January, April, July, August and September. The high values obtained could jeopardize the production of wind energy during these months. The correlation between the turbulence intensity and roughness length ranging from 0.75 in January to 0.94 in August revealed that these two parameters are linked by an increasing linear function. Finally, modified formulations of the longitudinal and transversal wind turbulence intensity developed from the van den Hurk and de Bruin model and based on the best-fitting approach were proposed. The error estimators (MAE; RMSE) computed to validate these modified models vary respectively from (0.0099; 0.0141) to (0.0614; 0.0890).},
 year = {2019}
}

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TY  - JOUR
T1  - Wind Turbulence Intensity Characteristics at 10m Above Ground Along the Cotonou Coast, Benin
AU  - Hagninou Elagnon Venance Donnou
AU  - Aristide Barthélémy Akpo
AU  - Julien Djossou
AU  - Basile Bruno Kounouhewa
Y1  - 2019/11/25
PY  - 2019
N1  - https://doi.org/10.11648/j.ijrse.20190804.11
DO  - 10.11648/j.ijrse.20190804.11
T2  - International Journal of Sustainable and Green Energy
JF  - International Journal of Sustainable and Green Energy
JO  - International Journal of Sustainable and Green Energy
SP  - 65
EP  - 80
PB  - Science Publishing Group
SN  - 2575-1549
UR  - https://doi.org/10.11648/j.ijrse.20190804.11
AB  - The characteristics of the wind turbulence intensity that are essential to know before installing a wind turbine at a site were investigated along the coast of Cotonou in Benin. The average speed, direction, roughness length, friction velocity, turbulence intensity and relationship between the roughness and wind turbulence intensity were evaluated as well. Using the estimators derived from a simple isotropic Gaussian model of turbulent wind fluctuations, we proposed modified models for estimating the turbulence intensity of wind components. Wind speed and direction data recorded at 10 m above ground level from 2011 to 2014 during the first Compact of the Millennium Challenge Account (MCA) in Benin were utilized. The results obtained indicated that the annual average roughness length is evaluated at 1.25×10-4 m, and the annual mean friction velocity is equal to 0.41 m.s-1. Peak values of the turbulence intensity vary from 0.3 to 0.6 except during the months of January, April, July, August and September. The high values obtained could jeopardize the production of wind energy during these months. The correlation between the turbulence intensity and roughness length ranging from 0.75 in January to 0.94 in August revealed that these two parameters are linked by an increasing linear function. Finally, modified formulations of the longitudinal and transversal wind turbulence intensity developed from the van den Hurk and de Bruin model and based on the best-fitting approach were proposed. The error estimators (MAE; RMSE) computed to validate these modified models vary respectively from (0.0099; 0.0141) to (0.0614; 0.0890).
VL  - 8
IS  - 4
ER  -

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Hagninou Elagnon Venance Donnou

Laboratory of Radiation Physics, University of Abomey-Calavi, Cotonou, Benin
Aristide Barthélémy Akpo

Laboratory of Radiation Physics, University of Abomey-Calavi, Cotonou, Benin
Julien Djossou

Laboratory of Radiation Physics, University of Abomey-Calavi, Cotonou, Benin
Basile Bruno Kounouhewa

Laboratory of Radiation Physics, University of Abomey-Calavi, Cotonou, Benin

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Hagninou Elagnon Venance Donnou, Aristide Barthélémy Akpo, Julien Djossou, Basile Bruno Kounouhewa. (2019). Wind Turbulence Intensity Characteristics at 10m Above Ground Along the Cotonou Coast, Benin. International Journal of Sustainable and Green Energy, 8(4), 65-80. https://doi.org/10.11648/j.ijrse.20190804.11

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Hagninou Elagnon Venance Donnou; Aristide Barthélémy Akpo; Julien Djossou; Basile Bruno Kounouhewa. Wind Turbulence Intensity Characteristics at 10m Above Ground Along the Cotonou Coast, Benin. Int. J. Sustain. Green Energy 2019, 8(4), 65-80. doi: 10.11648/j.ijrse.20190804.11

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Hagninou Elagnon Venance Donnou, Aristide Barthélémy Akpo, Julien Djossou, Basile Bruno Kounouhewa. Wind Turbulence Intensity Characteristics at 10m Above Ground Along the Cotonou Coast, Benin. Int J Sustain Green Energy. 2019;8(4):65-80. doi: 10.11648/j.ijrse.20190804.11

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@article{10.11648/j.ijrse.20190804.11,
  author = {Hagninou Elagnon Venance Donnou and Aristide Barthélémy Akpo and Julien Djossou and Basile Bruno Kounouhewa},
  title = {Wind Turbulence Intensity Characteristics at 10m Above Ground Along the Cotonou Coast, Benin},
  journal = {International Journal of Sustainable and Green Energy},
  volume = {8},
  number = {4},
  pages = {65-80},
  doi = {10.11648/j.ijrse.20190804.11},
  url = {https://doi.org/10.11648/j.ijrse.20190804.11},
  eprint = {https://article.sciencepublishinggroup.com/pdf/10.11648.j.ijrse.20190804.11},
  abstract = {The characteristics of the wind turbulence intensity that are essential to know before installing a wind turbine at a site were investigated along the coast of Cotonou in Benin. The average speed, direction, roughness length, friction velocity, turbulence intensity and relationship between the roughness and wind turbulence intensity were evaluated as well. Using the estimators derived from a simple isotropic Gaussian model of turbulent wind fluctuations, we proposed modified models for estimating the turbulence intensity of wind components. Wind speed and direction data recorded at 10 m above ground level from 2011 to 2014 during the first Compact of the Millennium Challenge Account (MCA) in Benin were utilized. The results obtained indicated that the annual average roughness length is evaluated at 1.25×10-4 m, and the annual mean friction velocity is equal to 0.41 m.s-1. Peak values of the turbulence intensity vary from 0.3 to 0.6 except during the months of January, April, July, August and September. The high values obtained could jeopardize the production of wind energy during these months. The correlation between the turbulence intensity and roughness length ranging from 0.75 in January to 0.94 in August revealed that these two parameters are linked by an increasing linear function. Finally, modified formulations of the longitudinal and transversal wind turbulence intensity developed from the van den Hurk and de Bruin model and based on the best-fitting approach were proposed. The error estimators (MAE; RMSE) computed to validate these modified models vary respectively from (0.0099; 0.0141) to (0.0614; 0.0890).},
 year = {2019}
}

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TY  - JOUR
T1  - Wind Turbulence Intensity Characteristics at 10m Above Ground Along the Cotonou Coast, Benin
AU  - Hagninou Elagnon Venance Donnou
AU  - Aristide Barthélémy Akpo
AU  - Julien Djossou
AU  - Basile Bruno Kounouhewa
Y1  - 2019/11/25
PY  - 2019
N1  - https://doi.org/10.11648/j.ijrse.20190804.11
DO  - 10.11648/j.ijrse.20190804.11
T2  - International Journal of Sustainable and Green Energy
JF  - International Journal of Sustainable and Green Energy
JO  - International Journal of Sustainable and Green Energy
SP  - 65
EP  - 80
PB  - Science Publishing Group
SN  - 2575-1549
UR  - https://doi.org/10.11648/j.ijrse.20190804.11
AB  - The characteristics of the wind turbulence intensity that are essential to know before installing a wind turbine at a site were investigated along the coast of Cotonou in Benin. The average speed, direction, roughness length, friction velocity, turbulence intensity and relationship between the roughness and wind turbulence intensity were evaluated as well. Using the estimators derived from a simple isotropic Gaussian model of turbulent wind fluctuations, we proposed modified models for estimating the turbulence intensity of wind components. Wind speed and direction data recorded at 10 m above ground level from 2011 to 2014 during the first Compact of the Millennium Challenge Account (MCA) in Benin were utilized. The results obtained indicated that the annual average roughness length is evaluated at 1.25×10-4 m, and the annual mean friction velocity is equal to 0.41 m.s-1. Peak values of the turbulence intensity vary from 0.3 to 0.6 except during the months of January, April, July, August and September. The high values obtained could jeopardize the production of wind energy during these months. The correlation between the turbulence intensity and roughness length ranging from 0.75 in January to 0.94 in August revealed that these two parameters are linked by an increasing linear function. Finally, modified formulations of the longitudinal and transversal wind turbulence intensity developed from the van den Hurk and de Bruin model and based on the best-fitting approach were proposed. The error estimators (MAE; RMSE) computed to validate these modified models vary respectively from (0.0099; 0.0141) to (0.0614; 0.0890).
VL  - 8
IS  - 4
ER  -

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