13 results on '"REMOTE sensing"'
Search Results
2. Analyse de la cinématique de la végétation en Côte d'Ivoire pendant les conflits à travers une métrique phénologique et la corrélation de Kendall de deux séries temporelles de NDVI
- Author
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Andrieu, J.
- Subjects
Remote sensing ,TSA ,NDVI ,Phenology ,Forest ,savana transition ,Côte d'Ivoire ,Agriculture - Abstract
Vegetation Change Analysis in Côte d'Ivoire During Conflicts Using a Phenological Metric and Kendall Correlation of two NDVI Time Series. A multiscale and multisatellite remote sensing approach has been set up in order to study vegetation changes, in particular the forest-savanna limit, first over a region including Ivory Coast and Benin with an 8 km resolution, from 1981 to 2006, then over Ivory Coast only, with a 250 m resolution, from 2002 to 2014. Both two NDVI time series (AVHRR et MODIS) has been studied on the one hand with Kendall correlation and on the other hand, with an original metric which enable to distinguish vegetation which photosynthesis presents a unimodal rhythm (one rainy season and one vegetative activity season) or bimodal rhythm (two rainy seasons and two vegetative activity seasons).
- Published
- 2018
3. Impact des pressions anthropiques sur la flore de la forêt classée du Haut-Sassandra (Centre-ouest de la Côte d'Ivoire)
- Author
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Kouakou, ATM., Assale, AAY., and Barima, YSS.
- Subjects
Armed conflict ,Degradation ,Floristic diversity ,Remote sensing ,Haut ,Sassandra ,Côte d'Ivoire ,Agriculture - Abstract
Impact of Anthropogenic Pressures on the Flora of the Haut-Sassandra Classified Forest (Central-West of Côte d'Ivoire). The classified forest of Haut-Sassandra located in the center-west of Ivory Coast is subjected to a strong anthropization since the politico-military conflicts of the year 2002. This study aims to quantify the degradation in the northern, central and southern zones of this domain. To achieve this, a spatiotemporal analysis of the dynamics of the three zones was made based on five Landsat images from 1990, 1997, 2002, 2006 and 2013. It was supplemented by a floristic inventory of each zone. The results show that forest cover conversions of the three zones occurred during the conflict period with regression rates of more than 50 %. At the floristic level, 622 plant species distributed among 410 genera and 104 families were recorded in all three zones. The North and the Center differ significantly from the South by the average specific richness. The inventoried flora generally differs from one zone to another depending on the degradation factors, with a greater diversity in cocoa plantations. However, this flora, although diversified, does not have any similarity with that of the forest relics still present in the classified forest of Haut-Sassandra.
- Published
- 2018
4. Dynamique d'expansion des cacaoyères dans les zones de contact forêt-savane : cas de la sous-préfecture de Kokumbo (Centre de la Côte d'Ivoire)
- Author
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Kpangui, KB., Vroh, BTA., Kouamé, D., Goné, BZB., Koffi, BJC., and Adou Yao, CY.
- Subjects
Remote sensing ,Cocoa farm ,Vegetation dynamics ,Agroforestry system ,Côte d'Ivoire ,Agriculture - Abstract
Cocoa Expansion Dynamics in the Forest-Savanna Contact Zones: Case Study of the Sub-prefecture of Kokumbo (Côte d'Ivoire). In Ivory Coast, forests-savannah transition areas have been considered from the 1970s as unfavorable to cocoa cultivation. In recent years, however, there has been a comeback to the cocoa economy in these areas. This study carried out in the sub-prefecture of Kokumbo, aimed to map and to follows the spatial and temporal evolution of this crop using Landsat images of 1990, 2002 and 2016. In order to better understand the fundamentals of the peasant practices, surveys were carried out in different villages in the area. Treatment shows that the influence of cocoa culture is becoming increasingly important in the region. This cocoa crop is set up to the detriment of forests and savannahs, which have lost 25% and 58.1% of their initial area respectively. The surveys identified four types of cocoa farms, of which 65% of the plots were created between 2002 and 2014. Facing this relatively recent expansion, the issue of the sustainability of cocoa production systems in this region arises. Their agronomic and economic performances and their value for biodiversity conservation should be analyzed in future studies.
- Published
- 2018
5. Dynamiques de peuplement et modifications paysagères dans la zone rurale sud de la ville de Bonon en 2000 et 2015 (région de la Marahoué, Côte d'Ivoire)
- Author
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Krouba, GID., Ouattara, AA., Kouakou, ACA., Adopo, ARI., Fauret, P., Coulibaly, B., Kaba, D., Koffi, YJJ., Assi Kaudjhis, PJ., and Courtin, F.
- Subjects
Dynamic of settlement ,Agriculture ,Landscape ,Remote sensing ,Bonon ,Côte d'Ivoire - Abstract
Dynamics of Settlement and Landscape Modifications in the Southern Rural Area of the Bonon City (Marahoué Region, Côte d'Ivoire). Estimated at 15 million of hectares at the beginning of the 20th century, the surface of dense forests in Ivory Coast was estimated at 2.7 million hectares at the end of the same century. Strong anthropic pressure led to a reduction of forest surface in this country. This is the case in the Bonon area, a sub-prefecture in Marahoué region, where cash crops were developed in the early 1970s. Field data collected in 2000 on settlement and landscape were compared with those from 2015. Changes in population density, spatial organization of the territory and rural communications were described. Within 15 years, the rural population density has increased from 75 inhabitants / km² in 2000 to 134 inhabitants / km² in 2015. This increase in human population densities, despite the socio-political crisis from 2002 to 2011, has profoundly changed the landscape in this area. The analysis of the landscape shows a considerable increase in cultivation surface. Agricultural surface have risen from 3818 hectares in 2000 to 5250 hectares in 2015, so an increase of 31% over 15 years. The original forest has almost disappeared.
- Published
- 2018
6. UTILISATION DES SIG ET DE LA TELEDETECTION POUR LA CARTOGRAPHIE DE LA SUSCEPTIBILITE AUX MOUVEMENTS D'INSTABILITE DE VERSANT DANS L'OUEST MONTAGNEUX DE LA CÔTE D'IVOIRE.
- Author
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Kouadio, Boyossoro Hélène, Kouamé, Kan Jean, Brice, Sika, Aké, Gabriel Etienne, N'guessan Bi, Vami Hermann, and Yapi, Assa
- Subjects
- *
REMOTE sensing , *GEOGRAPHIC information systems , *LANDSLIDES - Abstract
Slope instability phenomena, by their essentially random nature, generate risks for various elements of mountain heritage. In Man Mountains region of Man, located in the west of Côte d'Ivoire, the manifestation of these phenomena is made more and more because of the rugged terrain and climate change. This study aims to map potential areas of slope instability movements in the Man area to prevent natural damage and/or casualties. The method used in this work, is based on remote sensing, Geographic Information System (GIS) and Saaty's analytic hierarchy process (AHP) method. Six (6) factors involved in the occurrence of landslides such as slope, drainage density, fracturing density, regolith thickness, precipitation, and normalized vegetation index (NDVI) have been mapped. Their integration into a GIS has made it possible to map the region's susceptibility to slope instability movements. Indeed, using Saaty's analytic hierarchy process (AHP) method, a prioritization, a weighting and a classification of the different factors were made. This facilitated the linear combination of the different factors in the GIS. The resulting susceptibility map was field-verified to yield a susceptibility map to slope instability movements of Man area. This map shows classes of very low, low, moderate, high and very high susceptibility. Areas of high and very high instability represent 14.65%. They are located in the West Central of the study area. Majority of these areas are found on the slopes of the Tours and Dan, mountains located between Biankouma and Man, which are characterized by steep slopes and registrate rainfall of more than 1500 mm. [ABSTRACT FROM AUTHOR]
- Published
- 2020
7. Dynamique d'expansion des cacaoyères dans les zones de contact forêtsavane: cas de la sous-préfecture de Kokumbo (Centre de la Côte d'Ivoire).
- Author
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Kpangui, K. B., Vroh, B. T. A., Kouamé, D., Goné, B. Z. B., Koffi, B. J.-C., and Yao, C. Y. Adou
- Abstract
In Côte d'Ivoire, forests-savannah transition areas have been considered from the 1970s as unfavorable to cocoa cultivation. In recent years, however, there has been a comeback to the cocoa economy in these areas. This study carried out in the sub-prefecture of Kokumbo, aimed to map and to follows the spatial and temporal evolution of this crop using Landsat images of 1990, 2002 and 2016. In order to better understand the fundamentals of the peasant practices, surveys were carried out in different villages in the area. Treatment shows that the influence of cocoa culture is becoming increasingly important in the region. This cocoa crop is set up to the detriment of forests and savannahs, which have lost 25% and 58.1% of their initial area respectively. The surveys identified four types of cocoa farms, of which 65% of the plots were created between 2002 and 2014. Facing this relatively recent expansion, the issue of the sustainability of cocoa production systems in this region arises. Their agronomic and economic performances and their value for biodiversity conservation should be analyzed in future studies. [ABSTRACT FROM AUTHOR]
- Published
- 2018
8. RELATION ENTRE LES ÉCOULEMENTS DE SURFACE ET SOUTERRAIN DANS LE BASSIN VERSANT DU HAUT BANDAMA EN CÔTE D'IVOIRE.
- Author
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KOUAMÉ K. A., KOUDOU A., SOROKOBY V. M., KOUAMÉK. F., and KOUASSI A. M.
- Abstract
Copyright of Larhyss Journal is the property of Biskra University, Research Laboratory in Subterranean & Surface Hydraulics and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
- Published
- 2017
9. Apport de la télédétection et d'un SIG à la cartographie des changements de l'occupation du sol dans le bassin versant de la Lobo en Côte d'Ivoire
- Author
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Vincent Tchimou Assoma, Jean Saturnin Dio, Jean-Patrice Jourda, and Noëllie Ahou Yao
- Subjects
land use change ,Physical geography ,Land cover ,Côte d'Ivoire ,Risque d'inondation ,bassin versant de la Lobo ,télédétection ,Pluies extrêmes ,Climate ,Système d'Information Géographique (SIG) ,Flood ,remote sensing ,Meteorology ,Flooding ,Occupation du sol ,Irrégularité pluviométrique ,Crues ,Flood risk ,Crue ,Adaptation of agriculture ,Météorologie ,Geography (General) ,Vegetation ,Forest cover ,Climat ,changement d'occupation du sol ,Adaptation de l'agriculture ,Inondation ,Extreme rainfall ,General Medicine ,Végétation ,Floods ,GB3-5030 ,Rainfall irregularity ,Land use ,G1-922 ,Lobo watershed ,Couvert forestier ,Geographic Information System (GIS) ,Ivory Coast - Abstract
Cette étude des changements de l'occupation du sol dans le bassin versant de la Lobo (12767 km2) s'appuie sur les images multispectrales TM (1986), ETM+ (2008) et OLI (2015) des satellites Landsat et sur des levés de terrain servant de contrôle. Les traitements appliqués aux images ont alimenté une base de données gérée dans un SIG. La cartographie de l'occupation du sol en 1986, 2008 et 2015 a permis d'évaluer les mutations entre les différentes dates. Les classes "culture-jachère" et "culture" ont toujours été largement dominantes, mais avec de fortes variations pour chacune d'elles, les deux variant en sens inverse. Dès 1986, la classe forêt ne représentait que 4,6 % du terrain d'étude (584 km2). Sa part est tombée à 0,96 % (123 km2) en 2008, avant de remonter à 2,3 % (299 km2) en 2015, en lien pour partie avec le développement de cultures arbustives. Sur la période d'étude, la forêt a considérablement régressé dans les secteurs où elle aurait dû être protégée, la forêt classée du Haut-Sassandra et le Parc National de la Marahoué. This study of land cover changes in the Lobo watershed (12767 km2) is based on multispectral TM (1986), ETM+ (2008) and OLI (2015) images from Landsat satellites and on field surveys as a control. The processing applied to the images fed a database managed in a GIS. The mapping of land use in 1986, 2008 and 2015 made it possible to assess the changes between the different dates. The "crop-fallow" and "crop" classes have always been largely dominant, but with strong variations for each of them, both varying in opposite directions. As early as 1986, the forest class represented only 4.6 % of the study area (584 km2 ). Its share fell to 0.96 % (123 km2) in 2008, before rising to 2.3 % (299 km2) in 2015, partly in connection with the development of shrub crops. Over the study period, the forest declined considerably in the areas where it should have been protected, the classified forest of Haut-Sassandra and the Marahoué National Park.[Translated with https://www.deepl.com/fr/translator (free version)]
- Published
- 2021
10. Spatial distribution and population dynamics of the palmyrah, Borassus aethiopum Mart. by remote sensing and Geographic Information System (GIS) of the Lamto Reserve (Central Côte d'Ivoire)
- Author
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DOUFFI, KOUAKOU GUY-CASIMIR, Université Nangui Abrogoua, Université Nangui Abrogoua, Abidjan (Côte d'Ivoire), and KONÉ MOUSSA
- Subjects
Lamto ,Spatial structure ,Télédétection ,Populations Dynamic ,Côte d’Ivoire ,Borassus aethiopum Mart ,Dynamique des populations ,Remote sensing ,[SDE.BE]Environmental Sciences/Biodiversity and Ecology ,[SDV.BV.BOT]Life Sciences [q-bio]/Vegetal Biology/Botanics ,Structure spatiale - Abstract
Palmyrah trees (Borassus aethiopum Mart., Arecaceae) are more or less concerned by threat in their ecological area. This work aims to determine the spatial structure and dynamics of Palmyrah population in Lamto reserve, in the transition area of forest-savannah.Land cover characterization by the neural net algorithm was carried out. Environmental characterization was possible thanks to ground temperature like (LST, Land Surface Temperature), ground moisture (NDWI, Normalized Difference Water Index) algorithms on LANDSAT data (TM 1988, ETM+ 2002 & OLI+ 2015) and Elevation digital model of SRTM data, and formulated using ENVI 5.1 software. Pattern analysis like multidistances Ripley Function K (d) and neighbors distances (Average Nearest Neighbor) were applied to determine the extrinsic structure of Palmyrah trees. Cluster and outlier analysis (Local Anselin Moran’s I) was used for intrinsic structuring. The crossing in GIS of environmental data of Cluster and Outlier Analysis makes it possible to emphasize the environmental influence through clusters responses pace and the plants abundances. Detection and delineation of Palmyrah foliar crown on a very high resolution multispectral image data (GeoEye 1) were carried out using rule classification (rule-based classification) in ENVI. This study shows that forests area is increase of 240 ha. It passed from 21.42 % (610.42 ha) in 1988 to 29.85% (850.67 ha) in 2015, in spite of the bush fires. Palmyrah trees are aggregated and heterogeneous at seedling stage. Adults’ structure shows a random distribution with a homogeneous character. Palmyrah trees are more abundant with unimodal responses paces. Favorable ground temperatures and moistures to palmyrah trees abundance are function to the savannah type which shelters it. This analysis shows that the environmental factors control Palmyrah trees distribution. The detection assessment of Palmyrah trees to the search threshold for 10 meters made it possible to obtain a good precision according to the biological stage. It is more than 90% among palmyrah adult’s trees and nearly 50% at the juvenile’s stages.; Les rôniers (Borassus aethiopum Mart., Arecaceae) sont plus ou moins concernés par la menace dans leur milieu écologique. Ce travail vise à déterminer la structure spatiale et la dynamique de la population des rôniers à la réserve de Lamto, en zone de transition forêt-savane. La caractérisation de l’occupation du sol par l’algorithme des réseaux de neurones a été effectuée. La caractérisation environnementale a été possible grâce aux algorithmes de la empérature de surface (LST, Land Surface Temperature), de l’humidité de surface (NDWI, Normalized Difference Water Index) sur des images LANDSAT (TM 1988, ETM+ 2002 & OLI+ 2015) et du modèle numérique d’altitude de l’image SRTM, formulés à l’aide du logiciel ENVI 5.1. Les modèles d’analyses dont les multidistances (Fonction K(d) de Ripley) et les plus proches voisins (Average Nearest Neighbor) ont été appliqués pour déterminer la structure extrinsèque des rôniers. L’appariement de grappes et des valeurs arbitraires (Anselin Local Moran’s I) a été utilisé pour la structuration intrinsèque. Le croisement dans le SIG des données environnementales à l’appariement de grappes permet de faire ressortir l’influence environnementale à travers l’allure des réponses des grappes et l’abondance des plantes. La détection et délinéation de la couronne foliaire des rôniers sur une image multispectrale (GeoEye 1) de très haute résolution ont été effectuées à l’aide de la classification à base de règle (rule-based classification) dans ENVI. Il ressort de cette étude que la superficie des forêts est en hausse de 240 ha, malgré les feux de brousses. Elle est passée de 21,42% (610,42 ha) en 1988 à 29,85% (850,67 ha) en 2015. Les rôniers sont répartis au niveau plantule en agrégat, de caractère hétérogène. Celle des adultes présente une répartition aléatoire avec un caractère homogène. Les rôniers sont plus abondants avec des allures de réponses unimodales. Les températures et humidités de surface favorables à l’abondance des rôniers sont fonction de la formation de savane qui l’abrite. Cette analyse montre que les facteurs environnementaux contrôlent la répartition des rôniers. L’évaluation de la détection des rôniers au seuil de recherche de 10 mètres a permis d’obtenir une bonne précision en fonction du stade de développement. Elle est de plus de 90% chez les rôniers adultes et près de 50% chez les juvéniles.
- Published
- 2020
11. De l'enquête à la modélisation rétro-prospective (2001-2015) de la déforestation de la Forêt Classée du Haut Sassandra dans un contexte de conflit armé (Côte d'Ivoire)
- Author
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Andrieu, Julien, Barima, Yao Sadaiou Sabas, Moreno, Diego, Vignal, Matthieu, Zerbo, Roger, Études des Structures, des Processus d’Adaptation et des Changements de l’Espace (ESPACE), Université Nice Sophia Antipolis (1965 - 2019) (UNS), COMUE Université Côte d'Azur (2015-2019) (COMUE UCA)-COMUE Université Côte d'Azur (2015-2019) (COMUE UCA)-Avignon Université (AU)-Aix Marseille Université (AMU)-Centre National de la Recherche Scientifique (CNRS), Université Jean Lorougnon Guédé (UJloG ), Centre national de la recherche scientifique et technologique [Ouagadougou] (CNRST), ComUE USPC, Frédéric Alexandre (Pléiade EA 7338), Catherine Mering (LIED UMR 8236), Mathieu Valette (ERTIM EA 2320), Université Nice Sophia Antipolis (... - 2019) (UNS), and Centre National de la Recherche Scientifique et Technologique du Burkina Faso (CNRST)
- Subjects
Conflits ,Côte d'Ivoire ,Migrations ,Modélisation ,Télédétection ,Conflicts ,Modeling ,[SHS.GEO]Humanities and Social Sciences/Geography ,Deforestation ,Remote sensing ,Ivory Coast - Abstract
International audience; The aim of this study is to analyze deforestation in the Forêt Classée du Haut-Sassandra during the conflicts in Côte d’Ivoire by agent-based modeling. Land cover of this protected area was first determined by classifying satellite images. Then, spatial analysis of deforestation and interviews permitted to set up the rules of the model. Modeling results have been confronted to remote sensed land cover maps with a correspondence of 100 % for cultivated areas and a correlation of 0,98 between variograms. This validates the model and enables the estimation, inter alia, of population of farmers (16 000 farmers in 2013) with increase of migration rate from 2006.; Le but de cette étude est l’analyse par la modélisation multi-agent du défrichement de la forêt classée du Haut-Sassandra durant les conflits armés de 2002 à 2011 en Côte d’Ivoire. L’occupation du sol de cette aire protégée a d’abord été déterminée par des classifications d’images satellites, ensuite, une analyse spatiale du défrichement et une enquête ont permis d’établir les règles d’un modèle. La modélisation a été validée avec la cartographie de l’occupation du sol obtenue par télédétection avec une correspondance de 100 % des superficies agricoles et une corrélation de 0,98 entre les variogrammes. Ceci valide le modèle et permet d’estimer, entre autres, la population agricole (16 000 personnes en 2013) avec une augmentation du taux migratoire à partir de 2006.
- Published
- 2016
12. Dynamiques spatiales récentes du Parc National du Banco (PNB) et stratégies de gestion communautaire durable de ses ressources forestières (District d’Abidjan en Côte d’Ivoire)
- Author
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Gérard Beltrando, Nakouma Sako, Université Alassane Ouattara, Pôle de recherche pour l'organisation et la diffusion de l'information géographique (PRODIG), Université Paris 1 Panthéon-Sorbonne (UP1)-Institut de Recherche pour le Développement (IRD)-École pratique des hautes études (EPHE), and Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université Paris-Sorbonne (UP4)-AgroParisTech-Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS)
- Subjects
biodiversité végétale ,Côte d'Ivoire ,010504 meteorology & atmospheric sciences ,télédétection ,0507 social and economic geography ,lcsh:G1-922 ,dynamique paysagère ,01 natural sciences ,National Parc of Banco ,Banco ,biodiversité ,[SHS]Humanities and Social Sciences ,11. Sustainability ,végétation ,landscape dynamics ,ComputingMilieux_MISCELLANEOUS ,0105 earth and related environmental sciences ,Parc national ,pression urbaine ,biodiversity ,05 social sciences ,urban pressure ,Abidjan ,[SHS.GEO]Humanities and Social Sciences/Geography ,15. Life on land ,Remote sensing ,[SHS.ENVIR]Humanities and Social Sciences/Environmental studies ,développement durable ,Parc National du Banco (Abidjan) ,sustainable Development ,050703 geography ,lcsh:Geography (General) - Abstract
La dynamique spatio-temporelle récente de la forêt du Parc National du Banco (PNB), situé à l’intérieur des limites administratives du district d’Abidjan en Côte d’Ivoire, est cartographiée à partir de la comparaison post-classificatoire des classes de deux images multispectrales Spot 1 et 2 prises en janvier 1992 et 2002 et après validation par un inventaire de la végétation, réalisé durant l’été 2008 sur 196 points, suivant des transects nord-sud et est-ouest et des relevés ponctuels. D’un côté, une enquête socio-démographique (250 personnes choisies aléatoirement dans 6 villages riverains) ont permis de cerner les points de vue des acteurs locaux sur l’avenir du PNB. De l’autre côté, les observations de terrain réalisées autour et à l’intérieur des limites administratives du PNB ont également permis de vérifier et de valider les résultats cartographiques. Les résultats des inventaires montrent la présence d’une grande diversité végétale malgré l’anthropisation des marges de ce milieu forestier. Les analyses surfaciques des types de végétation, cartographiés à partir de l’image de la scène Spot (2002) centrée sur le parc, montrent une prédominance des formations forestières avec environ 4 000 ha soit 68 % de la superficie du PNB contre 1 746 ha soit 31 % en 1992. Les exploitations majeures de la végétation se localisent sur les marges du parc. En revanche, à l’intérieur du parc, les plantations forestières des années 1940 et les forêts « naturelles » connaissent une densification de leur végétation. Les résultats des enquêtes sur la perception des populations indiquent que 67 % des personnes interrogées estiment que l’amélioration de la politique actuelle de gestion du PNB et son aménagement constituent des moyens adéquats pour sa conservation et son développement durable. The recent space-time dynamics of the forest of the National Banco Parc, located inside the administrative limits of the district of Abidjan in Ivory Coast, caracterised by the post-classifying comparison of the classes of two multispectral images Spot 1 and 2 catches in January 1992 and 2002 (scene of 60 X 60 km² centered on the town of Abidjan, analyzes of three multispectral channels, XS1, XS2, XS3, pixel 20 m). Floristic inventories, carried out during the summer 2008 out of 196 points, according to a North-South and East-West transects, as well as socio-demographic investigations (250 people chosen by chance in 6 bordering villages) and of the observations of ground made it possible to check and correct the cartographic results and to determine the points of view of the local actors on the future of the PNB. The results of the inventories show a great vegetable diversity. The surface analyses of the types of vegetation charted starting from the image of under scene Spot (2002) centered on the park show a prevalence of the forest formations with approximately 4 000 ha either 68% of the surface in 2002 against 1.746 ha or 31% in 1992. The major exploitations of the vegetation are located on the margins of the park. On the other hand, inside the forest plantations of the 1940’s and the “natural” forests know positive evolutions. The results of the investigations into the perception of the populations also state that 67% of the questioned people estimate that the improvement of the current policy of management of the PNB and its installation constitutes adequate means for its conservation and its durable development.
- Published
- 2014
13. The use of remote sensing and multi-criteria analysis for the assessment of grounwater potentialities of an aquifer in a tropical area of West Africa: the case of Bongouanou area, East of Ivory Coast
- Author
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Assemian, Assie Emile, Kouame, D. A., Mobio, A. B. H., Kouamelan, A. N., Koudou, A., Kouadio, H. B., Dibi N'Da, Hippolyte, Therrien, R., Razack, Moumtaz, and UFR ds Sciences de la Terre et des Ressources Minières, Univ. Félix Houphouet Boigny, Abidjan, Cote d' ivoire
- Subjects
Landsat ETM+ ,socle ,Côte d'Ivoire ,télédétection ,fracturation ,underground water ,Bongouanou ,[SHS.GEO]Humanities and Social Sciences/Geography ,Remote sensing ,image radar ,eaux souterraines ,radar image ,nappe aquifère ,basement ,[SDU.STU.HY]Sciences of the Universe [physics]/Earth Sciences/Hydrology ,Ivory Coast ,images Landsat ,[SDU.STU.AG]Sciences of the Universe [physics]/Earth Sciences/Applied geology - Abstract
article publié en français, avec un résumé étendu en anglais, et des planches couleur hors-texte; International audience; The aim of the study is to identify highly potentially productive underground water areas, with a low depth, in the adminsitrative unit ("département" of Bondouarou, Ivory Coast. Radar images of Envista, and Landsat 7 ETM+ images have been processed, merged and interpreted to derive the fracturation spatial pattern of the area. Parameters from drillings have been also taken into account. Two multi-criteria analysis have been done, allowing the production of an aquifer potentiality map, following the method of Jourda, et al. (2006) on one hand, and a map od underground water productivity, following the approach of Saley (2003) on the other hand. Results of thes 2 maps are complementary and show that the southern regions of M'batto and Anoumaba (south)), Tiémelékro (west), Assie-Koumassi (north), André and Arrah (east) are poyentially the most productive in ground water.; L'objectif de cette étude est d'identifier les zones à fortes potentialités en eau souterraine, accessibles à faibles profondeurs, dans le département de Bongouanou. Des images radar Envisat et landsat7 ETM+ ont été traitées, fusionnées et interprétées pour extraire les fractures de la zone d'étude. Les paramètres des forages ont été aussi exploités. Leur intégration dans 2 analyses multicritères ont permis de produire d'une part, la carte des potentialités aquifères selon la méthode de JOURDA et al. (2006) et d'autre part, la carte de productivité en eau souterraine selon l'approche de SALEY (2003). Les résultats de ces 2 types de cartes sont complémentaires et montrent que les régions du Sud (M'batto, Anoumaba), de l'Ouest (Tiémelékro) du Nord (Assie-Koumassi) et de l'Est (Andé, Arrah) sont, dans ce milieu fissuré, les zones les plus potentiellement productives en eau souterraine.
- Published
- 2014
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