Extreme rainfall variability and trends in the district of Ouedeme, municipality of Glazoue (Benin)
Paper Details
Extreme rainfall variability and trends in the district of Ouedeme, municipality of Glazoue (Benin)
Abstract
This study aims to assess the extreme rainfall variability and trends in Ouedeme district, Glazoue municipality, Benin. Rainfall fluctuations, droughts, and floods pose major risks to food crops, mainly yams and rice, threatening food security and local agricultural systems’ resilience. The research is based on daily rainfall data from Savè synoptic station, covering 1961 to 2020. Seven ETCCDI climate indices (including PTOT, JP, SDII, P10, P20, PX1J, and CDD) have been used to quantify the intensity, frequency, and variability of extreme events. Statistical methods (mean, standard deviation, Lamb index) and software tools such as Excel have been used to process data and identify trends. The findings reveal that average annual precipitation amounts to 1,180 mm (±235 mm), with an overall downward trend. Also, while the mean number of rainy days is 82 (±11 days), the daily intensity (SDII) is 11 mm/day (±1 mm), both decreasing. However, a slight increase in heavy rainfall days (P10: 36 days ±7) and a moderate increase in very heavy rainfall days (P20: 18 days ±4) have been observed. Furthermore, consecutive dry days (CDD) are up to 34 days (±4), highlighting a trend towards more frequent dry spells. Overall, 32 of the 60 years analyzed had a deficit, compared to 28 with a surplus, reflecting significant interannual variability. Results highlight increased climate variability, with more frequent dry spells and intense rainfall, affecting crop cycles directly. Farmers’ adaptation strategies (early sowing, crop rotation, etc.) remain limited by insufficient resources and infrastructure. Improved water management and technical support are crucial to strengthening agricultural resilience to climate extremes.
Akponikpè G, Johnston P. 2011. Impact of climate and agricultural techniques on agricultural yields: Case studies in Benin. Environmental Management Review 1, 15.
Altieri MA, Nicholls CI. 2012. Agroecology: A science, movement, and practice. Sustainable Agriculture Reviews 2(1), 5.
Barro NB. 2023. Limited factors in the adoption of agroecological practices. African Journal of Social Sciences 3(2), 18.
Bélières JF, Bomal P, Bosc PM, Losch B, Marzin J, Sourisseau JM. 2015. Family farming around the world: Definitions, contributions and public policies. AFD 10.
Benmihoub A, Samia A, Benabid N. 2021. Challenges, practices and constraints for agroecological land use in the Sahara. New Medit 2, 3.
Boko M. 2002. Climate change and agriculture in West Africa. Review of Agricultural Management 301.
Collin JP, Ayouz M. 2006. The development of land markets and agricultural productivity in Sub-Saharan Africa: A review of literature. World Bank Policy Research Working Paper.
Côte M. 2002. From oases to development zones: The astonishing revival of Saharan agriculture. Mediterranean 99(3-4), 8.
Dugué P. 2013. What are the constraints to agroecological intensification? Grain of Salt 63-66, 30.
Gnanglè P. 2013. Traditional knowledge in climate risk management in Benin. African Environment Review 23(2), 143–157.
Hountondji C, Mathieu J. 2011. Climate change and agricultural production: The impact of extreme events in the Hills. Environmental Science Review 104(3-4).
Kpadonou R, Adégbola Y. 2012. Impact of climate change on agricultural yields in agroecological zones in Benin. Journal of Agricultural Science, 336–343.
Loko L. 2016. Climate change and its effects on agricultural practices in the municipality of Bantè. African Journal of Agriculture 192.
Tabou T. 2020. Rainfall variability and its impact on agriculture in northern Benin. Journal of Climate Change Studies 16, 278.
Tovignan S, Boko M. 2010. Impact of climate fluctuations on food crops in Benin. Journal of Sustainable Agriculture 217.
Wezel A, Bellon S, Doré T, Francis C, Vallod D, David C. 2009. Agroecology as a science, a movement, and a practice. Sustainable Agriculture Reviews 2(1), 28.
Koumassi Dègla Hervé, 2025. Extreme rainfall variability and trends in the district of Ouedeme, municipality of Glazoue (Benin). J. Biodiv. Environ. Sci., 27(3), 1-9.
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