Characterization of dry period in the transfrontier Bia watershed in Côte d’Ivoire and Ghana: contribution of Markov chains

Meledje, N’Diaye Hermann; Kouassı, Kouakou Lazare; N'go, Yao Alexis; Savané, Issiaka

doi:10.1684/agr.2015.0755

Cited by 4 publications

(4 citation statements)

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“…This study shows that the probability of having two successive dry years or two successive wet years is higher over the entire study area for the period 1984-2013. These results are similar to the work of Lazri et al (2007), Meddi and Meddi (2009) and Meledje et al (2015). Indeed, in their studies on the analysis of rainfall and the occurrence of drought, Lazri et al (2007) showed that in the "Sea" zone, the probability of having a non-precipitating state after a non-precipitating state is higher than in the "Land" zone.…”

Section: Discussionsupporting

confidence: 86%

“…Meddi and Meddi (2009) in northwest Algeria have shown that the probability of a dry year being followed by a dry year is higher in the west (Habra-Sig, Ghriss, Sidi bel Abbes and Maghnia plains) and the probability of having two successive non-drying years is high for all stations. Meledje et al (2015) indicate that the probability of having two successive dry years is higher in the northern part of the transboundary Bia river basin between Côte d'Ivoire and Ghana. For the period 2021 to 2050, the probability of having two successive dry years and two successive wet years will be higher over the entire basin and in the south, centre and north respectively.…”

Section: Discussionmentioning

confidence: 91%

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Analysis of Annual Rainfall Data by Markovian Approach in the Lobo Watershed (West-Center of Côte D’Ivoire)

Bi¹,

Ta²,

Allechy³

et al. 2020

Studia UBB Geographia

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The rainfall deficit has become remarkable in recent decades in Côte d'Ivoire in general and particularly in the Lobo watershed. The objective of this study is to analyze rain behaviour using weather generator MulGETS based on first order Markov chains to two states. Daily data from 1984 to 2013 from 17 stations were used to predict daily precipitation data for the period 2021 to 2050. The results obtained show that the probability of having two successive dry years or two successive wet years is higher over the entire study area for the period 1984-2013. For the period 2021 to 2050, the probability of having two successive dry years and two successive wet years will be higher over the entire basin and in the south, center and north respectively. The probability of a wet year followed by a dry year will be higher in the south, west, northwest and north of the basin. The probability of a dry year followed by a wet year will be relatively high in the north, center and southwest of the basin.

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Section: Discussionsupporting

confidence: 86%

Section: Discussionmentioning

confidence: 91%

Analysis of Annual Rainfall Data by Markovian Approach in the Lobo Watershed (West-Center of Côte D’Ivoire)

Bi¹,

Ta²,

Allechy³

et al. 2020

Studia UBB Geographia

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“…As for the maximum interannual dry sequences, they are almost all less than 3 months [51] and even if it is true that they increase after rainfall accidents as is the case in various studies [52,53,13,54,55], they remain marginal and do not significantly impact cocoa production in the regions studied.…”

Section: Discussionmentioning

confidence: 99%

Impact of Local Global Warming on Rainfall and Annual Cocoa Water Requirements in the Regions of Lôh-Djiboua and Gôh in West-central Côte d'Ivoire

Ehounou

Kouamé

Tahi

et al. 2019

IJECC

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Aims: To understand the role of the interannual variability of cumulative rainfall and maximum dry sequences in cocoa production in the Centre-Ouest, one of the cocoa basins in Côte d'Ivoire, in order to propose technical routes more adapted to current rainfall conditions. Study Design: Collection, analysis and processing of daily rainfall data collected by the rain gauges at Divo and Gagnoa stations. Location and Duration of Studies: Divo Cocoa Research Station of the National Center for Agricultural Research, between January 2017 and June 2019. Methodology: The rainfall regime of each locality was determined to assess the impact of rainfall changes on the seasonality of rainfall. The interannual variability of rainfall was studied from the reduced centred rainfall indices. The break years in the time series were detected at both stations from the Khrono Stat software. The interannual cumulative rainfall were analysed for each station and compared to the minimum threshold allowed for cocoa trees. The means of the maximum interannual dry sequences and their probabilities of occurrence were determined using the agrometeorological software called Instat + Version 3.37. Results: The rainfall regime in the area studied (west-central Côte d'Ivoire) has not been modified by the post-rupture rainfall recession as is the case in other parts of the country; it remains a bimodal system characterized by two rainy seasons and two dries during the year. The Divo and Gagnoa regions have been facing a general recession in rainfall since 1966 in Gagnoa and 1972 in Divo. However, the locality of Gagnoa has experienced an increase in rainfall since 2000. Most of the rupture detection tests identified rainfall rupture dates identical to those indicated by the interannual variability highlighted by the rainfall indices. In Gagnoa and Divo, the interannual cumulative rainfalls after the years of rainfall break are reduced compared to those before these rainfall accidents. This situation has led to an increase in the maximum interannual dry sequences in the departments studied. Conclusion: Local climate change has created difficult rainfall conditions after years of rainfall break for cocoa trees as their water needs are increasingly reduced, especially in Divo in Lôh-Djiboua where the downward trend in rainfall has been continuous since 1972. In Gagnoa since the beginning of this century, there has been a new wet period that allows rainfall to adequately meet the cocoa tree's water requirements.

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“…The [34] showed that the decades 1970-1979; 1980-1989 and 1990-1999 were dry periods. This decline in rainfall intensified during the 1980s and 1990s before rising slightly between 2007 and…”

Section: Relationship Between Meteorological (Spei) and Hydrological mentioning

confidence: 99%

Impact of Meteorological Drought on Streamflows in the Lobo River Catchment at Nibéhibé, Côte d’Ivoire

Koffi¹,

Kouadio²,

Yao³

et al. 2020

JWARP

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The management of water resources in watersheds has become increasingly difficult in recent years due to the frequency and intensity of drought sequences. The Lobo River catchment, like most tropical regions, has experienced alternating wet and dry periods. These drought periods have a significant impact on the availability of water resources in the basin. The objective of this study is to analyse the impact of meteorological drought on flows in the Lobo River catchment. Therefore, using the Normalized Precipitation and Evapotranspiration Index (SPEI) and the Drought Flow Index (SDI), the characteristics of droughts were studied. The results of this study show that meteorological droughts were more frequent than hydrological droughts in the Lobo River watershed. However, the hydrological drought was longer and more intense than the meteorological drought. The greater relationship between meteorological and hydrological drought was observed at the Daloa and Vavoua station (0.43 < r < 0.50) compared to the Zuenoula station (r < 0.5). In addition, there was a resumption of precipitation and runoff between 2007 and 2013 in the basin. The study of these climatic trends would be very useful in the choice of management and adaptation policies for water resources management.

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Characterization of dry period in the transfrontier Bia watershed in Côte d’Ivoire and Ghana: contribution of Markov chains

Cited by 4 publications

References 0 publications

Analysis of Annual Rainfall Data by Markovian Approach in the Lobo Watershed (West-Center of Côte D’Ivoire)

Analysis of Annual Rainfall Data by Markovian Approach in the Lobo Watershed (West-Center of Côte D’Ivoire)

Impact of Local Global Warming on Rainfall and Annual Cocoa Water Requirements in the Regions of Lôh-Djiboua and Gôh in West-central Côte d'Ivoire

Impact of Meteorological Drought on Streamflows in the Lobo River Catchment at Nibéhibé, Côte d’Ivoire

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Characterization of dry period in the transfrontier Bia watershed in Côte d’Ivoire and Ghana: contribution of Markov chains

Cited by 4 publications

References 0 publications

Analysis of Annual Rainfall Data by Markovian Approach in the Lobo Watershed (West-Center of Côte D’Ivoire)

Analysis of Annual Rainfall Data by Markovian Approach in the Lobo Watershed (West-Center of Côte D’Ivoire)

Impact of Local Global Warming on Rainfall and Annual Cocoa Water Requirements in the Regions of Lôh-Djiboua and Gôh in West-central Côte d'Ivoire

Impact of Meteorological Drought on Streamflows in the Lobo River Catchment at Nib&#233;hib&#233;, C&#244;te d’Ivoire

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Impact of Meteorological Drought on Streamflows in the Lobo River Catchment at Nibéhibé, Côte d’Ivoire