Browsing by Author "Manu, Andrew"

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  • Amenagement durable des terres dans le Sahel: Etude d'un bassin versant agricole a Hamdallaye, Niger
    Manu, Andrew; Zanguina, I.; Gandah, M.; Mahaman, I. (1994)
    La dégradation des terres menace la durabilité écologique et économique de l'Afrique sub-saharienne. Au Niger, l'augmentation de la population humaine et animale des récentes décennies a entraîné un déclin rapide dans la fertilité des terres culticables et la perte du couvert végétal des pâturages. L'Université de Texas A&M, en réponse à une requête de la Mission basée au Niger de l'Agence des Etats-Unis pour le développement international (USAID), a mise en marche une étude sur l'aménagement intégré des terres et un démonstration dans un petit bassin versant agricole (project IMAW-Aménagement Intégré des Bassins Versants Agricoles) à Hamdallaye, près de Niamey, Niger, en collaboration avec l'Institut National de Recherche Agronomique du Niger (INRAN) et le Programme d'Assistance à la Recherche sur l'Aménagement des Sols (TropSoils). La première phase du projet, qui a duré une année, a consité en une étude de faisabilité sur le sol, la végétation et les systèmes traditionnels d'exploitation des terres du bassin versant (Taylor-Powell et al., 1991; et Manu et al., 1991) suivie par la seconde phase qui a consisté en une étude appliquée et de démonstrations au champ pendant deux campagnes agricoles. Ce document présente: 1) les résultats d'une étude sur la regénération des terres; 2) une étude agronomique en milieu paysan; et 3) l'évaluation du projet à la fois par les paysans qui ont participé et par la communauté villageoise. Un bref perçu des deux rapports précédents sont présentés dans ce document.
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    Biodiversity management using remotely sensed data and GIS technologies: The case of Digya National Park, Ghana
    Twumasi, Yaw A.; Coleman, T. L.; Manu, Andrew (The International Society of Photogrammetry and Remote Sensing (ISPRS), 2005)
    Effective management of biodiversity resources in nature reserves requires accurate and up-to-date information to determine the type of land cover and land use over time. This study employed Landsat TM and ETM+ data to develop a database for Digya National Park in Ghana which will assist in the management and formulation of policies and offer decision-making tasks related to park management. The study revealed that the most significant cause of deforestation in Digya National Park is the expanding Lake Volta, which accounted for two-thirds of all deforestation factors. Other factors included human settlement and the extension of illegal farming activities. The paper concludes by outlining policy recommendations such as the need for the Wildlife Department to coordinate its protection efforts with Departments of the Government of Ghana which have authority over the Volta Dam and also to involve the community in the decision making process both at the local and national level.
  • Développement participatif de technologies de CES/DRS dans le Terroir de Boromtenga au Burkina Faso: des résultats édifiants, fruits d'un dialogue quotidien entre chercheurs et organisations paysannes
    Taonda, S.; Barrow, A.; Ilboudo, B.; Zougmoré, R.; Manu, Andrew; Coleman, T. (2004)
    En zone soudanienne du Burkina Faso, Une Organisation paysanne interpelle une équipe Pluridisciplinaire de chercheurs au sujet d'une problématique de gestion de ressources naturelles dans leur terroir. Il s'en suit une riche expérience recherche participative qui dure depuis plus de 4 ans. Plus de 7 technologies de CES/DRS ont été coévaluées tant sur le plan agronomique que sur le plan socio- économique par 3 acteurs en partenariat:
  • The impact of urban growth and long-term climatic variations on the sustainable development of the City of Niamey, Niger
    Twumasi, Yaw A.; Manu, Andrew; Coleman, T. L.; Maiga, I. A. (Piscataway, NJ: Institute of Electrical and Electronics Engineers Inc., 2005)
    This paper examines the combined effect of population growth and climate change in the area surrounding Niamey, Niger. Using GIS technology, the study is able to look at a number factors and compare them through a time series dataset. The study finds that population growth is occurring at a period of agricultural decline due to the sensitivity of the surrounding Sahelian plain. It is realized that more sensitive systems for agricultural production are necessary to prevent soil erosion, drinking water contamination, and a sustained food supply so that the city does not exceed carrying capacity.
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    Remote sensing and GIS application in coastal zone management: A case study of Ghana
    Twumasi, Yaw A.; Manu, Andrew; Coleman, T. L. (The Geo-Information Society of South Africa, 2005)
    This presentation provides background on the historical significance of coastal ecosystems and current natural and human-caused threats. A study was undertaken to use Landsat TM and ETM+ images to detect land degradation along the east coast of Ghana and create an information database to assist in the effective planning and management of resources along the coast of Ghana. The presentation concludes with recommendations for the application of remote sensing and GIS data to coastal policy formation.
  • Simulating urban growth patterns of a developing country city using computational neural networks
    Manu, Andrew (Pretoria, South Africa: EIS-Africa, 2005)
    Presented at the AfricaGIS 2005 Conference: Beyond talk: Geo-information working for Africa, CSIR International Convention Centre, Tshwane, South Africa, 31 October - 4 November 2005
  • Soil-related plant growth variability in the Sahel with a special reference to Western Niger
    Manu, Andrew; Salou, M.; Hossner, L. R.; Wilding, L. P.; Jou, A. S. R. (College Station, Texas, USA: Department of Soil and Crop Sciences, Texas A&M University, 1996)
    Poor crop growth and establishment on agricultural lands in the Sahel have been attributed to such biophysical factors as scarce and inclement rainfall, inherent low soil fertility, wind and water erosion, and increased cropping and grazing intensity. Interactively, these conditions have led to high soil spatial variability over short distance and corresponding plant growth variability. This report summarizes research on soil-related plant growth variability and their possible remedies in the Sahel with special reference to western Niger. Attempts were also made to characterize soil spatial variability on both micro and macro scale of resolution. A major part of the work was conducted by researchers of the Soil Management Collaborative Research and Support Program (TropSoils) from Texas A&M University and their collaborators at the Institut Nacional de Reserches Agronomiques du Niger (INRAN).
  • Use of geospatial information management as a decision support tool in land use planning: A case of Ghana
    Twumasi, Yaw A.; Manu, Andrew; Coleman, T. L.; Osei, A. (2006)