Actualization of Climatic Parameters of the Empirical Methods of ORSTOM and CIEH: Case of Ivory Coast

Amani Michel Kouassi; Relwinde Abdoul-Karim Nassa; Makouin Aissa Louise Toure

doi:doi:10.11648/j.eas.20210606.14

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Actualization of Climatic Parameters of the Empirical Methods of ORSTOM and CIEH: Case of Ivory Coast

Amani Michel Kouassi, Relwinde Abdoul-Karim Nassa, Makouin Aissa Louise Toure

Published in Engineering and Applied Sciences (Volume 6, Issue 6)

Received: 16 November 2021 Accepted: 6 December 2021 Published: 24 December 2021

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Abstract

Climate change is a reality that affects several climate variables including precipitation. This change and the variability of the climate are considered to be the greatest challenges facing humanity in the decades to come, on all geographic scales and in all economic sectors. In this context of severe climate change, it will be judicious to review the sizing parameters of hydraulic structures. The determination of hydrological standards is necessary within the framework of development projects for the design of hydraulic structures and the storm water management. The objective of this study is to update the parameters of the ORSTOM and CIEH methods. These are annual rainfall normals, extreme rainfall norms, extreme rainfall quantiles as well as the extreme rainfall gradex. The study carried out was based on annual maximum daily rainfall data and annual rainfall data collected over the period 1931-2020 from twenty-six (26) rainfall stations. The methodological approach is based on the one hand on the evaluation of the normals (normals of annual rainfall, norms of extreme rainfall) and on the other hand on the determination of the quantiles of the daily maximum annuals. These quantiles were used to assess the extreme rainfall gradex. The annual rainfall norms evaluated over the period 1931-2020 vary between 1,180 and 1,457.4 mm. As for the normals of the maximum daily rains, they oscillate between 73.61 mm (Agnibilékro) and 136.59 mm (Tabou) with an average of 94.57 mm. The 10-year return period quantiles evaluated over the period 1931-2020 vary between 103 mm (Dimbokro) and 222 mm (Tiassalé) with an average of 143.6 mm. As for the centennial quantiles, they oscillate between 132 mm (Dimbokro) and 326 mm (Tiassalé) with an average of 211.5 mm. An analysis of the extreme rainfall gradex revealed values fluctuating between 0.28 (Dimbokro) and 0.71 (Guiglo) with an average of 0.47 on Ivorian territory. The gradex coefficients determined are all greater than the regional value of 0.38 defined by ORSTOM except for the Dimbokro station (0.28). Indeed, the calculated gradex coefficient biases are all positive (ranging from +2.63 to + 86.84%) except that of Dimbokro (-26.32%). The use of the regional value of 0.38 reflects an under designing of the values of the gradex coefficient for the whole country except the Dimbokro station.

Published in	Engineering and Applied Sciences (Volume 6, Issue 6)
DOI	10.11648/j.eas.20210606.14
Page(s)	125-137
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), 2021. Published by Science Publishing Group

Keywords

Empirical Methods of ORSTOM and CIEH, Hydrological Standards, Ivory Coast

References

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[12]	Brou Y. T. (2005). Climat, mutations socio-économiques et paysages en Ivory Coast. Mémoire de synthèse des activités scientifiques présenté en vue de l’obtention de l'Habilitation à.
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Amani Michel Kouassi, Relwinde Abdoul-Karim Nassa, Makouin Aissa Louise Toure. (2021). Actualization of Climatic Parameters of the Empirical Methods of ORSTOM and CIEH: Case of Ivory Coast. Engineering and Applied Sciences, 6(6), 125-137. https://doi.org/10.11648/j.eas.20210606.14

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ACS Style

Amani Michel Kouassi; Relwinde Abdoul-Karim Nassa; Makouin Aissa Louise Toure. Actualization of Climatic Parameters of the Empirical Methods of ORSTOM and CIEH: Case of Ivory Coast. Eng. Appl. Sci. 2021, 6(6), 125-137. doi: 10.11648/j.eas.20210606.14

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Amani Michel Kouassi, Relwinde Abdoul-Karim Nassa, Makouin Aissa Louise Toure. Actualization of Climatic Parameters of the Empirical Methods of ORSTOM and CIEH: Case of Ivory Coast. Eng Appl Sci. 2021;6(6):125-137. doi: 10.11648/j.eas.20210606.14

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@article{10.11648/j.eas.20210606.14,
  author = {Amani Michel Kouassi and Relwinde Abdoul-Karim Nassa and Makouin Aissa Louise Toure},
  title = {Actualization of Climatic Parameters of the Empirical Methods of ORSTOM and CIEH: Case of Ivory Coast},
  journal = {Engineering and Applied Sciences},
  volume = {6},
  number = {6},
  pages = {125-137},
  doi = {10.11648/j.eas.20210606.14},
  url = {https://doi.org/10.11648/j.eas.20210606.14},
  eprint = {https://article.sciencepublishinggroup.com/pdf/10.11648.j.eas.20210606.14},
  abstract = {Climate change is a reality that affects several climate variables including precipitation. This change and the variability of the climate are considered to be the greatest challenges facing humanity in the decades to come, on all geographic scales and in all economic sectors. In this context of severe climate change, it will be judicious to review the sizing parameters of hydraulic structures. The determination of hydrological standards is necessary within the framework of development projects for the design of hydraulic structures and the storm water management. The objective of this study is to update the parameters of the ORSTOM and CIEH methods. These are annual rainfall normals, extreme rainfall norms, extreme rainfall quantiles as well as the extreme rainfall gradex. The study carried out was based on annual maximum daily rainfall data and annual rainfall data collected over the period 1931-2020 from twenty-six (26) rainfall stations. The methodological approach is based on the one hand on the evaluation of the normals (normals of annual rainfall, norms of extreme rainfall) and on the other hand on the determination of the quantiles of the daily maximum annuals. These quantiles were used to assess the extreme rainfall gradex. The annual rainfall norms evaluated over the period 1931-2020 vary between 1,180 and 1,457.4 mm. As for the normals of the maximum daily rains, they oscillate between 73.61 mm (Agnibilékro) and 136.59 mm (Tabou) with an average of 94.57 mm. The 10-year return period quantiles evaluated over the period 1931-2020 vary between 103 mm (Dimbokro) and 222 mm (Tiassalé) with an average of 143.6 mm. As for the centennial quantiles, they oscillate between 132 mm (Dimbokro) and 326 mm (Tiassalé) with an average of 211.5 mm. An analysis of the extreme rainfall gradex revealed values fluctuating between 0.28 (Dimbokro) and 0.71 (Guiglo) with an average of 0.47 on Ivorian territory. The gradex coefficients determined are all greater than the regional value of 0.38 defined by ORSTOM except for the Dimbokro station (0.28). Indeed, the calculated gradex coefficient biases are all positive (ranging from +2.63 to + 86.84%) except that of Dimbokro (-26.32%). The use of the regional value of 0.38 reflects an under designing of the values of the gradex coefficient for the whole country except the Dimbokro station.},
 year = {2021}
}

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TY - JOUR
T1 - Actualization of Climatic Parameters of the Empirical Methods of ORSTOM and CIEH: Case of Ivory Coast
AU - Amani Michel Kouassi
AU - Relwinde Abdoul-Karim Nassa
AU - Makouin Aissa Louise Toure
Y1 - 2021/12/24
PY - 2021
N1 - https://doi.org/10.11648/j.eas.20210606.14
DO - 10.11648/j.eas.20210606.14
T2 - Engineering and Applied Sciences
JF - Engineering and Applied Sciences
JO - Engineering and Applied Sciences
SP - 125
EP - 137
PB - Science Publishing Group
SN - 2575-1468
UR - https://doi.org/10.11648/j.eas.20210606.14
AB - Climate change is a reality that affects several climate variables including precipitation. This change and the variability of the climate are considered to be the greatest challenges facing humanity in the decades to come, on all geographic scales and in all economic sectors. In this context of severe climate change, it will be judicious to review the sizing parameters of hydraulic structures. The determination of hydrological standards is necessary within the framework of development projects for the design of hydraulic structures and the storm water management. The objective of this study is to update the parameters of the ORSTOM and CIEH methods. These are annual rainfall normals, extreme rainfall norms, extreme rainfall quantiles as well as the extreme rainfall gradex. The study carried out was based on annual maximum daily rainfall data and annual rainfall data collected over the period 1931-2020 from twenty-six (26) rainfall stations. The methodological approach is based on the one hand on the evaluation of the normals (normals of annual rainfall, norms of extreme rainfall) and on the other hand on the determination of the quantiles of the daily maximum annuals. These quantiles were used to assess the extreme rainfall gradex. The annual rainfall norms evaluated over the period 1931-2020 vary between 1,180 and 1,457.4 mm. As for the normals of the maximum daily rains, they oscillate between 73.61 mm (Agnibilékro) and 136.59 mm (Tabou) with an average of 94.57 mm. The 10-year return period quantiles evaluated over the period 1931-2020 vary between 103 mm (Dimbokro) and 222 mm (Tiassalé) with an average of 143.6 mm. As for the centennial quantiles, they oscillate between 132 mm (Dimbokro) and 326 mm (Tiassalé) with an average of 211.5 mm. An analysis of the extreme rainfall gradex revealed values fluctuating between 0.28 (Dimbokro) and 0.71 (Guiglo) with an average of 0.47 on Ivorian territory. The gradex coefficients determined are all greater than the regional value of 0.38 defined by ORSTOM except for the Dimbokro station (0.28). Indeed, the calculated gradex coefficient biases are all positive (ranging from +2.63 to + 86.84%) except that of Dimbokro (-26.32%). The use of the regional value of 0.38 reflects an under designing of the values of the gradex coefficient for the whole country except the Dimbokro station.
VL - 6
IS - 6
ER -

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Author Information

Amani Michel Kouassi

National Polytechnic Institute Félix Houphou?t-Boigny (INP-HB), Department of Earth Sciences and Mineral Resources (STeRMi), Laboratory of Civil Engineering, Geosciences and Geographical Sciences, Yamoussoukro, Ivory Coast
Relwinde Abdoul-Karim Nassa

National Polytechnic Institute Félix Houphou?t-Boigny (INP-HB), Polytechnic Doctoral School (EDP), Yamoussoukro, Ivory Coast
Makouin Aissa Louise Toure

National Polytechnic Institute Félix Houphou?t-Boigny (INP-HB), Higher School of Mines and Geology (ESMG), Yamoussoukro, Ivory Coast

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APA Style

Amani Michel Kouassi, Relwinde Abdoul-Karim Nassa, Makouin Aissa Louise Toure. (2021). Actualization of Climatic Parameters of the Empirical Methods of ORSTOM and CIEH: Case of Ivory Coast. Engineering and Applied Sciences, 6(6), 125-137. https://doi.org/10.11648/j.eas.20210606.14

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ACS Style

Amani Michel Kouassi; Relwinde Abdoul-Karim Nassa; Makouin Aissa Louise Toure. Actualization of Climatic Parameters of the Empirical Methods of ORSTOM and CIEH: Case of Ivory Coast. Eng. Appl. Sci. 2021, 6(6), 125-137. doi: 10.11648/j.eas.20210606.14

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AMA Style

Amani Michel Kouassi, Relwinde Abdoul-Karim Nassa, Makouin Aissa Louise Toure. Actualization of Climatic Parameters of the Empirical Methods of ORSTOM and CIEH: Case of Ivory Coast. Eng Appl Sci. 2021;6(6):125-137. doi: 10.11648/j.eas.20210606.14

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@article{10.11648/j.eas.20210606.14,
  author = {Amani Michel Kouassi and Relwinde Abdoul-Karim Nassa and Makouin Aissa Louise Toure},
  title = {Actualization of Climatic Parameters of the Empirical Methods of ORSTOM and CIEH: Case of Ivory Coast},
  journal = {Engineering and Applied Sciences},
  volume = {6},
  number = {6},
  pages = {125-137},
  doi = {10.11648/j.eas.20210606.14},
  url = {https://doi.org/10.11648/j.eas.20210606.14},
  eprint = {https://article.sciencepublishinggroup.com/pdf/10.11648.j.eas.20210606.14},
  abstract = {Climate change is a reality that affects several climate variables including precipitation. This change and the variability of the climate are considered to be the greatest challenges facing humanity in the decades to come, on all geographic scales and in all economic sectors. In this context of severe climate change, it will be judicious to review the sizing parameters of hydraulic structures. The determination of hydrological standards is necessary within the framework of development projects for the design of hydraulic structures and the storm water management. The objective of this study is to update the parameters of the ORSTOM and CIEH methods. These are annual rainfall normals, extreme rainfall norms, extreme rainfall quantiles as well as the extreme rainfall gradex. The study carried out was based on annual maximum daily rainfall data and annual rainfall data collected over the period 1931-2020 from twenty-six (26) rainfall stations. The methodological approach is based on the one hand on the evaluation of the normals (normals of annual rainfall, norms of extreme rainfall) and on the other hand on the determination of the quantiles of the daily maximum annuals. These quantiles were used to assess the extreme rainfall gradex. The annual rainfall norms evaluated over the period 1931-2020 vary between 1,180 and 1,457.4 mm. As for the normals of the maximum daily rains, they oscillate between 73.61 mm (Agnibilékro) and 136.59 mm (Tabou) with an average of 94.57 mm. The 10-year return period quantiles evaluated over the period 1931-2020 vary between 103 mm (Dimbokro) and 222 mm (Tiassalé) with an average of 143.6 mm. As for the centennial quantiles, they oscillate between 132 mm (Dimbokro) and 326 mm (Tiassalé) with an average of 211.5 mm. An analysis of the extreme rainfall gradex revealed values fluctuating between 0.28 (Dimbokro) and 0.71 (Guiglo) with an average of 0.47 on Ivorian territory. The gradex coefficients determined are all greater than the regional value of 0.38 defined by ORSTOM except for the Dimbokro station (0.28). Indeed, the calculated gradex coefficient biases are all positive (ranging from +2.63 to + 86.84%) except that of Dimbokro (-26.32%). The use of the regional value of 0.38 reflects an under designing of the values of the gradex coefficient for the whole country except the Dimbokro station.},
 year = {2021}
}

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