scholarly journals Soil loss vulnerability: the case study of Aghien lagoon watershed outskirts Abidjan city (Côte d'Ivoire)

2021 ◽  
Vol 384 ◽  
pp. 121-126
Author(s):  
Amidou Dao ◽  
Ehouman Serge Koffi ◽  
Dabissi Djibril Noufé ◽  
Bamory Kamagaté ◽  
Lanciné Droh Goné ◽  
...  
Keyword(s):  
Cote D'ivoire ◽  
Soil Loss ◽  
Côte D’Ivoire ◽  
Methodological Approach ◽  
Annual Rainfall ◽  
Slope Length ◽  
Cote D’Ivoire ◽  
Research Activities ◽  
Côte D'ivoire

Abstract. Aghien lagoon is a source of fresh water outskirts of Abidjan city in the south of Côte d'Ivoire. For a better understanding of its functioning, we proposed to estimate its main tributaries (Bété and Djibi) soil loss during 2016 and 2017 as part of our research activities in the lagoon watershed in order to evaluate its vulnerability face to soil loss. The methodological approach is based on USLE (Universal Soil Loss Equation) incorporated into GIS (Geographic Information Systems). This equation takes into account five key factors: the erosivity of rainfall, the soil erodibility, the topographic factor integrating slope length and steepness, the cover-management factor and the support practice factor. The combination of these factors made it possible to obtain soil loss maps of the lagoon main tributaries. The analysis of them revealed that soil loss varying mostly between 0 and 250 t ha−1 yr−1 in 2016 and 2017. With regard to the two years, the vulnerability of the lagoon face to soil loss is “low” category. In fact, the soil loss class ranging from 0 to 20 t ha−1 yr−1 occupies more than 60 % of the two sub-basins area in 2016. This trend increased in 2017 with equivalent of 71 % of the area. On the over hand, the “very high” vulnerability ranging from 250 to 1050 t ha−1 yr−1, occupied in 2016, only 0.01 % of the area. In 2017, this category of vulnerability increased in intensity, occupying 0.05 % of it. Ultimately, the increasing observed in 2016 and 2017 seems to be related to annual rainfall of respectively 1553 and 2198 mm. The case study of Aghien lagoon, soil loss vulnerability can be improved by taking account a long time series of rainfall and land use data.

scholarly journals Contribution of Sentinel 1 Radar Data to Flood Mapping in the San-Pédro River Basin (South-west Côte d’Ivoire)

2020 ◽  
pp. 1-8
Author(s):  
Kouakou Hervé Kouassi ◽  
Yao Alexis N’go ◽  
Kouao Armand Anoh ◽  
Tanoh Jean-Jacque Koua ◽  
Cristian Constantin Stoleriu
Keyword(s):  
River Basin ◽  
Cote D'ivoire ◽  
Rainy Season ◽  
Côte D’Ivoire ◽  
Methodological Approach ◽  
Annual Rainfall ◽  
Cote D’Ivoire ◽  
San Pedro River ◽  
San Pedro ◽  
Côte D'ivoire

Floods result from the overflow of water which submerges the surrounding land. They are frequent on the coast of Côte d'Ivoire during the rainy season and have more or less serious consequences on the populations, property and the environment. The study site is the San Pedro river basin. It is a coastal catchment area characterized by an average annual rainfall of up to 2000 mm and subject to recurrent flooding. The objective of this study is to assess the risk of flooding during the great rainy season of 2017. The study aims to study flood hazard, assess vulnerability and map flood risk areas. The methodological approach is based on the use of C-band (5.6 cm) radar remote sensing data acquired by the Sentinel-1 sensor at 12-day intervals. These data are in GRD (Ground Range Detected) level 1 format and were used to calculate the radar backscatter coefficient. The results obtained allowed to map the extent of the flooded areas and showed that more than 6,000 ha of land is flooded for more than 3 days. Sentinel-1 has enormous potential to identify flooding risky areas and to continuously monitor them.

Environmental Change and the Cashew Sector: A Case Study in Manding-speaking Côte d'Ivoire

Mande Studies ◽  
2019 ◽  
Vol 21 ◽  
pp. 174
Author(s):  
Rojas ◽  
West ◽  
Hellweg ◽  
McDaniel ◽  
Moody
Keyword(s):  
Environmental Change ◽  
Cote D'ivoire ◽  
Côte D’Ivoire ◽  
Cote D’Ivoire ◽  
Côte D'ivoire

scholarly journals Remote Sensing and GIS Contribution for Groundwater Mapping Reservoirs in the Baya Watershed (Eastern Region of Côte d'Ivoire)

2019 ◽  
pp. 1-14
Author(s):  
M. J. Mangoua ◽  
K. A. Kouassi ◽  
G. A. Douagui ◽  
I. Savané ◽  
J. Biémi
Keyword(s):  
Remote Sensing ◽  
Cote D'ivoire ◽  
Côte D’Ivoire ◽  
Methodological Approach ◽  
Multicriteria Analysis ◽  
Eastern Region ◽  
Cote D’Ivoire ◽  
Directional Filtering ◽  
Côte D'ivoire ◽  
Landsat 7

This study is carried out in the Baya watershed in the eastern region of Côte d'Ivoire to highlight access to drinking water issue in the fratured areas of Côte d'Ivoire. It aims at mapping the groundwater reservoirs to optimize the future installment of new boreholes for a satisfactory success rate. For the methodological approach we use Landsat 7 satellite images to map fracture networks with the use of the directional filtering technique. The induced permeabilities from these fractures were calculated using Fanciss’s method. The multicriteria analysis and Hydrogeological Information System with Spatial Reference were adopted to map groundwater reservoirs. Structural mapping by remote sensing permitted the development of detailed fractures maps with more than 6,998 listed fractures responsible for the formation of fracture aquifers in the Baya watershed. The size of these fractures is spread over two orders of magnitude. The main orientations are NE-SO (N70-80), corresponding to the Eburnean orientations, E-O (N90-100) and NO-SE (N100-120), associated with the Liberian orientation. Induced permeabilities vary from 1.20.10-8 to 4.62.10-5 m/s with a regional average of about 5.32.10-6 m/s. The zones with strong induced permeabilities that coincide with those of high fracturing densities brought us to have five reservoirs in the basin, with two large reservoirs, two media and three small ones. This groundwater flows into the mainstream waters from two main directions.

Assessment of the effect of tsetse control on livestock productivity—a case study in northern Côte d'Ivoire

1996 ◽  
Vol 28 (1) ◽  
pp. 17-32 ◽  
Author(s):  
G.J. Rowlands ◽  
G.D.M. d'Ieteren ◽  
L. Coulibaly ◽  
P.A. Hecker ◽  
S.G.A. Leak ◽  
...  
Keyword(s):  
Cote D'ivoire ◽  
Côte D’Ivoire ◽  
Cote D’Ivoire ◽  
Tsetse Control ◽  
Côte D'ivoire ◽  
Livestock Productivity

‘The power of a simple gift’: The ethics of children’s evangelization by Christian NGOs in Côte d’Ivoire

2019 ◽  
Vol 66 (2) ◽  
pp. 256-272
Author(s):  
Marie Nathalie LeBlanc ◽  
Boris Koenig
Keyword(s):  
Cote D'ivoire ◽  
Côte D’Ivoire ◽  
Field Research ◽  
Cote D’Ivoire ◽  
Transnational Organizations ◽  
Côte D'ivoire ◽  
Local Actors ◽  
Holistic Conception ◽  
Local Discourses

This article examines how some Evangelical nongovernmental organizations (NGOs) in Côte d’Ivoire have focused their actions towards children and in doing so use strategies based on gifts and play. These organizations’ activities encourage a holistic conception of ‘development’ that is based on both spiritual and material dimensions. In fact, these NGOs provide fascinating examples of the interaction between divergent development ideals, which are based on seemingly competing notions of the ‘good life’. These organizations promote an ethics of evangelization, which rests on the underlying ideas that ‘good Christians will make good citizens’, by emphasizing activities geared to the tutoring of children through educational, charitable, sanitary, and playful interventions. In order to illustrate how the leaders of these local Evangelical NGOs carefully manipulate the border between play and evangelization, and how amusement and gift-giving are key to the interconnection of humanitarian and proselytizing activities, we focus the analysis on the activities of a local affiliate of the transnational NGO Samaritan’s Purse. This case study also highlights how ethical ideals of evangelization defined by transnational organizations are appropriated by local actors and integrated within local discourses regarding the moralization of Ivorian society. The article is based on ethnographic field research conducted in the city of Abidjan in 2011, 2012, and 2016.

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