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Land Use and Gully Dynamics in the Kourfa Watershed, Matankari (Southwest Niger)

Journal of Geographic Information System 2024年第4期16卷 306-320页

作者： Bachirou Hamadou Younoussa Tahirou Hassane Yaou Bouba Hassane Abass Kadade Sabou abdoulkader moussa issaka Amadou Abdourhamane Toure Zibo Garba Facult des Sciences et Techniques Universit de Dosso Dosso Niger Facult des Sciences et Techniques Universit Abdou Moumouni de Niamey Niamey Niger Facult des Sciences et Techniques Universit Andr Salifou de Zinder Zinder Niger

The main consequences of climate change in the Sahel have been the metamorphosis of surface conditions. These metamorphoses have resulted in surface degradation, of which silting up of watersheds is the main phenomenon. The objective of this study is to assess the environmental trends of the Kourfa pond watershed. The study is based on diachronic mapping with Landsat satellite images and Google Earth images, over the period 1986 to 2021. The study reveals that vegetation (whose rate of regression doubled between 1986 and 2021) has decreased to the benefit of crop areas (whose rate of increase multiplied by 3.61 between 1986 and 2021). Bare soil and encrusted areas have also decreased, with regression rates almost double than those of 1986. In addition, the Kourfa waterholes have experienced two types of changes over 35 years: one progressive between 2011 and 2016 and the other regressive between 2001 and 2021 compared to 1986. The ravine network has been multiplied by a factor of 2.4, with density more than doubled and the connectivity of the hydrographic networks has risen from 2 to 4, with significant bank recession. This dynamic of the Kourfa pond is linked to the high drainage, the increasing complexity of the gully network and the erosion due to the retreat of the watershed banks, all of which contribute to the silting-up of the Kourfa watershed.

关键词： Kourfa Pond Dynamics Watershed Dosso Niger

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Environmental Factors, Constraints and Risks of Rainwater Runoff in Commune II of Maradi (Republic of Niger)

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Open Journal of Modern Hydrology 2023年第4期13卷 211-228页

作者： Maman Sani Abdou Babaye Karimou Dia Hantchi abdoulkader moussa issaka Ousmane Laminou Manzo Yahaya Saadou Labo Choukouriya Laouali Sannoussi moussa Konaté Department of Geology Faculty of Science and Techniques Dan Dicko Dankoulodo University Maradi Niger Department of Earth and Environmental Sciences Faculty of Science and Techniques André Salifou University Zinder Niger Department of Rural Engineering and Water & Forests Faculty of Agronomy and Environmental Sciences Dan Dicko Dankoulodo University Maradi Niger Department of Geology Faculty of Science and Techniques Abdou Moumouni University Niamey Niger

The Urban Commune of Maradi in Niger experienced increasingly frequent flooding following rainy episodes generating volumes and water flows that are difficult to control in recent years. This study aims to determine the impacts of runoff water in Commune II of Maradi City and to assess the role of urban planning in runoff management, as well as the strengths and weaknesses of urban sanitation in Maradi. The methodological approach used consisted of: 1) an interpretation of documentary data, 2) gathering information on runoff at several sites in the study area, and 3) interviews and questionnaires with local communities. This approach made it possible to understand the degree of vulnerability of the populations to flooding and then to propose sustainable solutions to reduce the vulnerability of the affected populations, through the implementation of effective urban rainwater management practices (USWMP). The results show that the impacts of runoff are mainly related to the lack of adequate storm water drainage networks in the area, but also to the nature of the habitats. Geomorphological factors such as the nature of the soil, the slope of the terrain and the altitude increase the degree of risk. In addition, the inadequacy and dilapidation of the drainage systems of the canals and above all the anarchic occupation of the land linked to accelerated urbanization are the cause of flooding by stagnation of rainwater. A phenomenon now linked to numerous deteriorations of urban equipment, the runoff of rainwater in the city of Maradi carries so many pollutants that municipalities, businesses and individuals should put in place pollution prevention measures.

关键词： Niger Storm Water Impermeable Spaces Urban Runoff Flood Vulnerability

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