Decreasing Past and Mid-Century Rainfall Indices over the Ouémé River Basin, Benin (West Africa)

M’Po, Yèkambèssoun N’Tcha; Lawin, Agnidé Emmanuel; Yao, Benjamin; Oyerinde, Ganiyu Titilope; Attogouinon, André; Afouda, Abel

doi:10.3390/cli5030074

Cited by 27 publications

(29 citation statements)

References 41 publications

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“…The statistically significant decreasing trends in rainfall and runoff observed shows that the basin had not recovered from the drought, although the current annual rainfall and runoff is not as high as it was in the 1950s. This trend of decrease had been projected to continue to mid-century based on a study conducted at an adjacent catchment [12].The higher recent high runoff pattern at Kompongou station was due to unsustainable land-use management and rapid population growth leading to a process called the 'Sahelian Paradox' [24]. The Sahelian paradox is an observed runoff increase despite low rainfall.…”

Section: Discussionmentioning

confidence: 99%

“…The Mann-Kendall test evaluates the relative magnitudes of data and is widely used in hydrology [12,19].The advantage of this test is that the data need not comply with any particular distribution. The data values are assessed as an ordered time series.…”

Section: Trend Analysismentioning

confidence: 99%

“…Mann-Kendall normalized statistics Z was computed from variance of S as described in N'tcha M'po et al [12].The trend was dignified as 'no trend' when the change is not significant, and as an increasing or a decreasing trend' when S is positive or negative, respectively.…”

Section: Trend Analysismentioning

confidence: 99%

“…They respond to climate change influence in creative ways, using traditional knowledge and new technologies to find solutions that may help society in coping with the impending changes [11]. The scientific agreement that climate change is happening and will continue well into the future regardless of the effectiveness of mitigation measures [12] has warranted the need to understand how local farmers have coped with variability in water resources under climate change in order to guide strategies for adaptation in the future. Consequently, this paper evaluates impacts and responses to hydrological changes in the Niger Basin parts of Benin; with the broad aim of using the view of local people to ameliorate hydrological challenges in the Basin.…”

Section: Introductionmentioning

confidence: 99%

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Farmers’ Responses to Changing Hydrological Trends in the Niger Basin Parts of Benin

2017

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Sub-Saharan Africa is highly vulnerable to climate change given its low capacities of resilience to the enormous challenges climate change will pose. Research aimed at evaluating changes in hydrological trends and methods of adaptation was conducted in the Niger Basin parts of Benin at the peak of the rainy season in the year 2012. Rainfall and river discharge were analyzed from 1950-2010 in order to generate patterns of changes in the region. Structured questionnaires were used to evaluate the perceptions of 14 farming communities on climate-related issues and their methods of adaptations. Mann-Kendall and Pettit trend analyses were conducted for rainfall and river discharge. The findings indicated that significant decreases characterized rainfall and river discharge in the period of study. Flash flood was considered the major challenge faced in the region according to more than 90% of crop, animal, and fish farmers. Aside from that, decrease in water availability was identified as an additional challenge. Irrigation, diversification, water treatment, drainage, small dams, and dikes were reported as the common adaptation mechanisms in the catchments. This study will help in designing sustainable adaptation mechanisms to abrupt changes in the hydrology of the region.

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Section: Discussionmentioning

confidence: 99%

Section: Trend Analysismentioning

confidence: 99%

Section: Trend Analysismentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Farmers’ Responses to Changing Hydrological Trends in the Niger Basin Parts of Benin

2017

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“…Several studies [3] [4] [5] show that impacts of climate extremes are mostly depending on the spatial scale considered and vary from a region to another, from country to country and even from one local area to another within the same country. For Africa, many previous studies have investigated extreme events and have showed that changes in extreme temperature and precipitation are contrasting [6] [7] [8].…”

Section: Introductionmentioning

confidence: 99%

Future Extremes Temperature: Trends and Changes Assessment over the Mono River Basin, Togo (West Africa)

Emmanuel¹,

Batablinlè²,

Manirakiza³

et al. 2019

JWARP

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This study assessed the extreme temperatures trends and changes over Mono River Basin under the highest greenhouse gas emission scenario RCP8.5. Simulations of five (5) regional climate models (RCMs) provided by Africa-CORDEX program were selected from the eighth (8) considered. Future trends in temperature percentiles, including extremes, are used to assess changes in the distribution of daily temperature over Mono Basin in Togo. Changes of temperature and Extreme low (high) temperatures from the baseline period 1961-2010 were computed for future . This analysis reveals that in the north of the basin, for the positive trends, the maximum is 0.82˚C•year −1 given by model MPI-ESM2 at Tchamba while the strongest negative change is 0.26˚C•year −1 given by model MIROC at Sotouboua. In the south of the basin, the strongest negative trend is of 0.03˚C•year −1 given by model (A) CNRM-CMA5. The maximum ones of the trends for models-mean are all positive except at Anié. Higher percentiles of minimum and maximum temperature will increase at a greater rate than the lower percentiles during dry and rainy seasons (with differences more pronounced for maximum values) over the north. Concerning future changes, almost all the RCMs predicted an increase of maximum and minimum temperatures over most parts of the Mono Basin, particularly in the north. Finally, results predicted an increase of TX90P (TX10P) and TN90P (TN10P) from 10% to 45% (13% to 40%) and 0% to 35% (12% Mean value), respectively over Mono Basin.

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Climate Change Impact on Climate Extremes and Adaptation Strategies in the Vea Catchment, Ghana

Larbi

Nyamekye

Hountondji

et al. 2021

African Handbook of Climate Change Adaptation

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Climate change impact on rainfall and temperature extreme indices in the Vea catchment was analyzed using observation and an ensemble mean of bias-corrected regional climate models datasets for Representative Concentration Pathway (RCP 4.5) scenario. Rainfall extreme indices such as annual total wet-day precipitation (PRCPTOT), extremely wet days (R99P), consecutive wet days (CWD), consecutive dry days (CDD), and temperature indices such as warmest day (TXx) and warmest night (TNx) from the Expert Team on Climate Change Detection Monitoring Indices (ETCCDMI) were computed for both the historical (1986–2016) and future (2020–2049) period using the RClimdex. The parametric ordinary least square (OLS) regression approach was used to detect trends in the time series of climate change and extreme indices. The results show an increase in mean annual temperature at the rate of 0.02 °C/year and a variability in rainfall at the catchment, under RCP 4.5 scenario. The warmest day and warmest night were projected to increase by 0.8 °C and 0.3 °C, respectively, in the future relative to the historical period. The intensity (e.g., R99p) and frequency (e.g., CDD) of extreme rainfall indices were projected to increase by 29 mm and 26 days, respectively, in the future. This is an indication of the vulnerability of the catchment to the risk of climate disasters (e.g., floods and drought). Adaptation strategies such as early warning systems, availability of climate information, and flood control measures are recommended to reduce the vulnerability of the people to the risk of the projected impact of climate extreme in the future.

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Decreasing Past and Mid-Century Rainfall Indices over the Ouémé River Basin, Benin (West Africa)

Cited by 27 publications

References 41 publications

Farmers’ Responses to Changing Hydrological Trends in the Niger Basin Parts of Benin

Farmers’ Responses to Changing Hydrological Trends in the Niger Basin Parts of Benin

Future Extremes Temperature: Trends and Changes Assessment over the Mono River Basin, Togo (West Africa)

Climate Change Impact on Climate Extremes and Adaptation Strategies in the Vea Catchment, Ghana

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