Institution
Abdou Moumouni University
Education•Niamey, Niamey, Niger•
About: Abdou Moumouni University is a education organization based out in Niamey, Niamey, Niger. It is known for research contribution in the topics: Population & Agriculture. The organization has 796 authors who have published 808 publications receiving 17478 citations. The organization is also known as: University of Niamey & Abdou Moumouni Dioffo University.
Topics: Population, Agriculture, Climate change, Precipitation, Monsoon
Papers published on a yearly basis
Papers
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University College London1, Institut de recherche pour le développement2, University of Grenoble3, University of Sussex4, International Water Management Institute5, British Geological Survey6, University of Texas at Austin7, Sokoine University of Agriculture8, Makerere University9, Abdou Moumouni University10, University of Maiduguri11, Cemex12, University of Namibia13, University of the West of England14, University of Tokyo15, International Institute for Applied Systems Analysis16, National Taiwan University17
TL;DR: It is shown that levels of aridity dictate the predominant recharge processes, whereas local hydrogeology influences the type and sensitivity of precipitation–recharge relationships, and that a drier climate does not necessarily mean less recharge.
Abstract: Groundwater in sub-Saharan Africa supports livelihoods and poverty alleviation1,2, maintains vital ecosystems, and strongly influences terrestrial water and energy budgets3. Yet the hydrological processes that govern groundwater recharge and sustainability—and their sensitivity to climatic variability—are poorly constrained4,5. Given the absence of firm observational constraints, it remains to be seen whether model-based projections of decreased water resources in dry parts of the region4 are justified. Here we show, through analysis of multidecadal groundwater hydrographs across sub-Saharan Africa, that levels of aridity dictate the predominant recharge processes, whereas local hydrogeology influences the type and sensitivity of precipitation–recharge relationships. Recharge in some humid locations varies by as little as five per cent (by coefficient of variation) across a wide range of annual precipitation values. Other regions, by contrast, show roughly linear precipitation–recharge relationships, with precipitation thresholds (of roughly ten millimetres or less per day) governing the initiation of recharge. These thresholds tend to rise as aridity increases, and recharge in drylands is more episodic and increasingly dominated by focused recharge through losses from ephemeral overland flows. Extreme annual recharge is commonly associated with intense rainfall and flooding events, themselves often driven by large-scale climate controls. Intense precipitation, even during years of lower overall precipitation, produces some of the largest years of recharge in some dry subtropical locations. Our results therefore challenge the ‘high certainty’ consensus regarding decreasing water resources4 in such regions of sub-Saharan Africa. The potential resilience of groundwater to climate variability in many areas that is revealed by these precipitation–recharge relationships is essential for informing reliable predictions of climate-change impacts and adaptation strategies.
149 citations
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TL;DR: The HAPEX-Sahel experiment as discussed by the authors was an international experiment designed to provide the field data needed to model the climate of the Sahel and its dependence on land surface conditions.
145 citations
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TL;DR: The HAPEX-Sahel (Hydrologic Atmospheric Pilot Experiment in the Sahel) was an international program focused on the soil-plant-atmosphere energy, water and carbon balance in the west African Sahel as mentioned in this paper.
145 citations
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TL;DR: In this article, the authors propose to gradually rehabilitate the biomass production function of the soil through increased nutrient input and traditional water harvesting measures that have been promoted as “soil and water conservation” technologies in the Sahel, e.g. zai, in order to restore soil hydrological properties as prerequisite to boosting biomass production, and encourage during this restorative phase the regeneration of native evergreen multipurpose woody shrubs (NEWS) traditionally and deliberately associated to crops and managed the year around.
141 citations
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TL;DR: A method for generating the entire efficient set for a multiple objective linear program is developed, based on two characterizations of maximal efficient faces.
Abstract: A method for generating the entire efficient set for a multiple objective linear program is developed. The method is based on two characterizations of maximal efficient faces. The first characterization is used to determine the set of maximal efficient faces incident to a given efficient vertex, and the second characterization ensures that previously generated maximal efficient faces are easily recognized (and not regenerated). The efficient set is described as the union of maximal efficient faces. An alternate implicit description of the efficient set as the set of all optimal vectors for a finite set of linear programs is also provided.
136 citations
Authors
Showing all 802 results
Name | H-index | Papers | Citations |
---|---|---|---|
Jan Bogaert | 69 | 595 | 18499 |
Mahabir P. Gupta | 39 | 233 | 5868 |
Ali Djibo | 27 | 41 | 2233 |
Guillaume Favreau | 23 | 51 | 1671 |
S. Selvakumar | 18 | 68 | 1155 |
Jean Lejoly | 17 | 114 | 1343 |
Guillaume Favreau | 15 | 32 | 1065 |
Jean-Claude Micha | 15 | 81 | 832 |
Abdelmajid Soulaymani | 14 | 213 | 922 |
Oumarou Ide | 14 | 16 | 892 |
Abdul Razak Ibrahim | 14 | 53 | 1020 |
Ali Mahamane | 13 | 109 | 688 |
Boubacar Kadri | 13 | 34 | 475 |
Abdou Amza | 13 | 40 | 468 |
Mahamane Saadou | 12 | 58 | 362 |