Готові списки джерел за темами / Wouri estuary

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Добірка наукової літератури з теми "Wouri estuary"

Автор: Grafiati
Опубліковано: 18 листопада 2022

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Статті в журналах з теми "Wouri estuary"

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Fotsi, Pouvreau, Brenon, Onguene, and Etame. "Temporal (1948–2012) and Dynamic Evolution of the Wouri Estuary Coastline within the Gulf of Guinea." Journal of Marine Science and Engineering 7, no. 10 (September 30, 2019): 343. http://dx.doi.org/10.3390/jmse7100343.

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Анотація:
The Wouri estuary is located in the Gulf of Guinea on the Atlantic coast of Cameroon’s coastline plain (3°49′ and 4°04′ north latitude and 9°20′ to 9°40′ east longitude), and is strongly influenced by coastal dynamics that have remained unquantified over a long period of time. This study analyzed the historical evolution of the Wouri estuarine coastline between 1948 and 2012. Variations in the estuarine evolution of the Wouri were studied from (i) minute topographic extracts from 1948, (ii) 1996–1999 nautical charts, and (iii) 2012 spatial map vectors. The net temporal spatial variation rates were calculated using the statistical methods of the Digital Shoreline Analysis System (DSAS). These change rates were also calculated over two time intervals (1948–1996 and 1996–2012) and over a 64-year period (1948–2012). The study reveals highly disparate results. Indeed, kinematics show that the Wouri estuary was dominated by erosion in its downstream section, with 262.83 ha for –3.2 m/year and 110.56 ha for –5.8 m/year between 1948–1996 and 1996–2012 respectively, and by accretion on the other hand in its upstream section, with 239.17 ha for 4.3 m/year in zone 5 between 1948–1996 and 150.82 ha for 12.6 m/year in zone 4 between 1996–2012. Thus, over the 64-year period (1948–2012), we have a dominance of variation by erosion downstream and conversely by accretion upstream, marked by the presence of amplifying factors (anthropogenic pressure and climate change) of the rate of variation of morphological evolution at the beginning of the 21st century, as compared to the middle-20th century. The observed development of sediment loss and accumulation, both influences and will influence, the sediment regime along the Wouri estuarine coastline. There is a need to develop a systematic sub-regional coastal surveillance activity to effectively manage Cameroon’s coastline system.
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Ngo-Massou, VM, GL Essome-Koum, E. Ngollo-Dina, and N. Din. "Composition of macrobenthos in the Wouri River estuary mangrove, Douala, Cameroon." African Journal of Marine Science 34, no. 3 (October 1, 2012): 349–60. http://dx.doi.org/10.2989/1814232x.2012.725288.

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Ngo-Massou, Vanessa Maxemilie, Guillaume Léopold Essomè-Koum, Ernest Kottè-Mapoko, and Ndongo Din. "Biology and Distribution of Mangrove Crabs in the Wouri River Estuary, Douala, Cameroon." Journal of Water Resource and Protection 06, no. 04 (2014): 236–48. http://dx.doi.org/10.4236/jwarp.2014.64029.

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4

Njinkoué, Jean Michel, Rodrigue Foumedzo, Marlyse Solange Leng, Justin Djimbie Djopnang, Adélaïde Démassé Mawamba, Marie Modestine Kana, Florian J. Schweigert, Inocent Gouado, and François Tchoumbougnang. "Proximate Composition and Micronutrient Contents of Callianassa turnerana from the Wouri Estuary, Cameroon." Journal of Food Research 8, no. 1 (December 28, 2018): 32. http://dx.doi.org/10.5539/jfr.v8n1p32.

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Callianassa turnerana, called Cameroon ghost shrimps is shrimp with a great sociocultural interest in Cameroon. This study assessed proximate composition and micronutrients contents of Callianassa turnerana from the Wouri estuary in Cameroon. Adult shrimps were collected. The proximate composition, mineral, carotenoids and vitamin E contents were determined in edible parts (male and female) and in eggs of C. turnerana using official analytical methods. One way ANOVA and Fisher’s post hoc PLS test was used to analyze the data. The moisture content were 66±1.5%, 62 ±2.85%, 49.0 ±1.60% in edible parts of male, female and in eggs respectively. Protein contents were high in all the samples ranging from 10.49±0.92% in male edible parts to 30.06±0.89% in eggs. Lipid contents were more than 12% in all samples. Carbohydrate were absent in eggs while the contents were 9.92±0.99% in male and 12.23±0.81% in female edible parts. C. turnerana is a good source of minerals. Sodium (0.983±0.001%- 1.656±0.005%) and Phosphorus (0.974±0.002%-1.321±0.002%) were the main macro elements in all samples. Zn was the major microelement in edible parts with the value ranged from 6.43±0.49mg/100g (male) to 7.62±0.35mg/100g (female) while Cu was the major microelement (10.15±3.57mg/100g) in eggs. High levels of total carotenoids (7.9-15.45µg/g) and vitamin E (12.53-24.03µg/g) were recorded. The main carotenoids were β-caroten (0.637-1.337µg/g) followed by α-caroten (0.216-0.437µg/g). C. turnerana is a good source of many major nutrients and micronutrients and could be used to combat malnutrition and improve health.
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Ramatlapeng, Goabaone J., Eliot A. Atekwana, Hendratta N. Ali, Isaac K. Njilah, and Gustave R. Nkoue Ndondo. "Assessing salinization of coastal groundwater by tidal action: The tropical Wouri Estuary, Douala, Cameroon." Journal of Hydrology: Regional Studies 36 (August 2021): 100842. http://dx.doi.org/10.1016/j.ejrh.2021.100842.

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Fusi, Marco, Gian Maria Beone, Nicoleta Alina Suciu, Angela Sacchi, Marco Trevisan, Ettore Capri, Daniele Daffonchio, Ndongo Din, Farid Dahdouh-Guebas, and Stefano Cannicci. "Ecological status and sources of anthropogenic contaminants in mangroves of the Wouri River Estuary (Cameroon)." Marine Pollution Bulletin 109, no. 2 (August 2016): 723–33. http://dx.doi.org/10.1016/j.marpolbul.2016.06.104.

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Mbusnum, Kevin G., Laure Malleret, Pierre Deschamps, Imen Khabouchi, Laurence Asia, Stéphanie Lebarillier, Guillemette Menot, Raphael Onguene, and Pierre Doumenq. "Persistent organic pollutants in sediments of the Wouri Estuary Mangrove, Cameroon: Levels, patterns and ecotoxicological significance." Marine Pollution Bulletin 160 (November 2020): 111542. http://dx.doi.org/10.1016/j.marpolbul.2020.111542.

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Atheull, Adolphe, Ndongo Din, Simon N. Longonje, Nico Koedam, and Farid Dahdouh-Guebas. "Commercial activities and subsistence utilization of mangrove forests around the Wouri estuary and the Douala-Edea reserve (Cameroon)." Journal of Ethnobiology and Ethnomedicine 5, no. 1 (2009): 35. http://dx.doi.org/10.1186/1746-4269-5-35.

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9

Besack, Felix, Ebonji Seth Rodrigue, Ajonina Gordon Nwutih, Edikin Roland Dieudonné, Sone Essoh Willy, Nguekeu Brice, Mbang Essome Junior, Hamadou Toume Michel-Remi, Onguene Raphael, and Tomedi Eyango Minette. "Spatial and Temporal Variation of the Hydrological Parameters in the Wouri-Nkam Section of the Cameroon Estuary, Central African Atlantic Coast." Open Journal of Marine Science 11, no. 04 (2021): 129–56. http://dx.doi.org/10.4236/ojms.2021.114009.

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Gounou Pokam, Blaise Pascal, Janvier Domra Kana, Jorelle Larissa Meli’i, Marthe Mbond Ariane Gweth, Serges Hugues Pokam Kegni, Michel Constant Njock, Ibrahim Mbouombouo Ngapouth, Michel André Pouth Nkoma, Yves Christian Mbono Samba, and Philippe Njandjock Nouck. "An Attempt to Study Foundation Anchoring Conditions in Sedimentary Estuaries Using Integrated Methods." Applied Sciences 12, no. 14 (July 16, 2022): 7175. http://dx.doi.org/10.3390/app12147175.

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Анотація:
The search for and knowledge of the best conditions for anchoring the foundations of certain structures such as bridges, tunnels and quays in sedimentary estuaries is a challenge, for both scientists in general and engineers in particular. Indeed, wharves are structures that receive a lot of stresses and therefore require anchoring to avoid tilting and to guarantee their stability during service. This work, based on the analysis of data from seismic refraction methods, mechanical soundings and laboratory tests, characterises the terrain of the Wouri estuary in Central Africa. The objective is to determine and present the subsurface layers encountered as well as their characteristics, in order to define the best conditions for anchoring the foundations to ensure the stability of the quays to be built there. The seismic refraction campaign shows that the study area is relatively heterogeneous over the first 25 m, with velocities measured in the range 1520–1750 m/s; modulated in two distinct ranges, between 1520–1580 m/s characteristic of mud and loose sediments (alternating layers of clay, sand, loose silt) and the range 1580–1750 m/s corresponding to the signature of sandy-silty or compact clays. The mechanical tests show sedimentary soils, with alternating layers of sandy clay and clayey sand over the 42 m drilled, loose over the first 30 m in the bank area and over the first 15 m in the canal or dredge area, with a limit pressure of less than 1 MPa. Similarly, the soil samples taken and tested in the laboratory show that the soils are clayey over the first 30 metres, plastic and liquid with respect to their water content, respectively, below and above the liquidity limits, confirming their loose character. The results of seismic refraction, mechanical soundings and laboratory tests show that, in estuarine areas characterised by alternating sandy clay and clayey sand, there are not always hard formations in the first 25 metres of depth but, from a depth of 30 m, the soils become moderately compact and begin to form an anchoring layer sufficient to guarantee the stability of the quays against earth pressure forces.
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Дисертації з теми "Wouri estuary"

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Fossi, Fotsi Yannick. "Dynamique morpho-sédimentaire de l’estuaire du Wouri, Cameroun." Thesis, La Rochelle, 2022. http://www.theses.fr/2022LAROS012.

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Анотація:
L’estuaire du Wouri, situé au coeur du Golfe de Guinée et ouvert sur l’océan Atlantique est soumis à un large éventail d’influence atmosphérique, océanique, continentale et anthropique à différentes échelles de temps (court et long-terme) contrôlant son évolution. La première partie de cette thèse, axée sur des archives remontant au 20ème siècle, a permis de reconstituer l’histoire de l’évolution du littoral estuarien du Wouri. Parallèlement, pour déterminer les tendances d’évolution des hauteurs d’eau, quantifier et qualifier la cinématique du trait de côte et des fonds dans l’estuaire, un travail d’inventaire, de numérisation et d’analyse des documents historiques a été réalisé. Ceci a permis d’enregistrer une évolution du niveau moyen à un rythme d’environ 25mm/an en 17 ans (2002 – 2019). Les résultats ont révélé une prédominance des variations dominées par l’érosion en aval et inversement par l’accrétion en amont, sur la période de 64 ans (1948-2012). Ces tendances sont accentuées par la présence de facteurs amplificateurs (pression anthropique et changement climatique). Afin d’étudier les processus hydrodynamiques et sédimentaires à court terme, une modélisation numérique de la propagation de la marée et la distribution des salinités et des sédiments fins a été réalisée à l’aide de TELEMAC 3D (calibré et validé grâce aux mesures in-situ acquises au cours de l’année 2019). La marée a montré une asymétrie dominée par le jusant dans sa partie inférieure et inversement par le flot dans sa partie supérieure. La distribution de la salinité a permis de caractériser l’estuaire de bien mélangé en vive-eau, particulièrement en étiage à stratifié en morte eau, particulièrement en période de crue. Les variations saisonnières, du régime fluvial ont montré une migration longitudinale de la position de la zone de turbidité maximale : déplacement en amont pendant les étiages et en aval pendant les crues avec pour conséquence une exportation massive de sédiments dans la partie intermédiaire et aval de l’estuaire. Dans un contexte actuel du changement climatique associé aux forts impacts anthropiques, cette étude souligne la nécessité de l’utilisation des archives historiques, de données in-situ couplées à un modèle numérique pour mieux comprendre l’évolution passée et actuelle de l’hydrodynamique et de la dynamique sédimentaire
The Wouri estuary, located in the heart of the Gulf of Guinea and open to the Atlantic Ocean, is subject to a wide range of atmospheric, oceanic, continental and anthropic influences at different time scales (short and long term) controlling its evolution. The first part of this thesis, based on archives dating back to the 20th century, allows us to reconstruct the history of the evolution of the Wouri estuary coastline. At the same time, in order to determine the evolution trends of the water levels, to quantify and qualify the kinematics of the coastline and the bottoms in the estuary, an inventory, digitization and analysis of historical documents was carried out. This allowed to record an evolution of the average level at a rate of about 25mm/year in 17 years (2002 - 2019). The results revealed a predominance of variations dominated by erosion downstream and conversely by accretion upstream, over the 64-year period (1948-2012). These trends are accentuated by the presence of amplifying factors (anthropogenic pressure and climate change). In order to study the hydrodynamic and sedimentary processes in the short term, a numerical modeling of the tidal propagation and the distribution of salinities and fine sediments was performed using TELEMAC 3D (calibrated and validated thanks to in-situ measurements acquired during 2019). The tide showed an asymmetry dominated by the ebb in its lower part and inversely by the flood in its upper part. The distribution of salinity allowed to characterize the estuary from well mixed in spring tide, particularly in low water to stratified in neap tide, particularly in flood period. Seasonal variations of the river regime have shown a longitudinal migration of the position of the maximum turbidity zone : upstream during low water and downstream during high water with a massive export of sediments in the intermediate and downstream part of the estuary. In a current context of climate change associated with strong anthropogenic impacts, this study highlights the need to use historical archives, in-situ data coupled with a numerical model to better understand the past and present evolution of hydrodynamics and sediment dynamics
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Mbusnum, Gweth Kevin. "Evaluation of hydrophobic organic contaminants in two aquatic environmments of Cental Africa, Cameroon : lake Barombi Mbo and the Wouri estuary mangrove." Thesis, Aix-Marseille, 2020. http://www.theses.fr/2020AIXM0266.

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Les Polluants Organiques Persistants (POPs) sont des composés hautement toxiques, persistants dans l’environnement, une capacité de transport à grande distance et accumulation sur les phases riches en matière organique. Compte tenu de la vulnérabilité des écosystèmes aquatiques aux pollutions et la rareté des données sur les POPs en Afrique, cette thèse examine les niveaux de Pesticides organochlorés (POCs), Polychlorobyphelyes (PCBs) et Hydrocarbures polyaromatiques (HAPs) dans le bassin versant du Lac Barombi (LBW) et la Mangrove estuaire du Wouri (MEW). Dans le LBW, les POCs détectés étaient, l’endosulfan, l‘hexachlorocyclohexanes (HCHs), le dieldrine and l’aldrine. Aucun OCPs n’a été détecté dans les eaux et les plus fréquemment détectés étaient les HCHs avec des teneurs plus élevées dans les sols par rapport au sédiments (ruisseaux et Lac). Le ratio α/γ-HCH ont indiqué l’utilisation récente du lindane (γ-HCH). La présence des OCPs a été attribué à l’agriculture et la pêche. Les teneurs en PAHs étaient plus élevées dans les sédiments lacustres que les autres échantillons. Les sources pyrolytiques de HAPs étaient dominantes plus spécifiquement la combustion d’herbes, du bois ou le charbon. Les recommandations pour la qualité des sédiments (SQGs) un faible risque de toxicité sur les organismes aquatiques. Dans les MEW, les teneurs en HAPs dans les sédiments étaient 10 fois plus élevés que les PCBs et Pesticides Chlorés (PCLs). Les PCLs les plus abondant étaient l’endosulfan, l’alachlor, l’heptachlor, le lindane (γ-HCH) et le DDT pour lesquels les métabolites indiquent une utilisation récente. La contribution des HAPs pyrolytiques était dominante
Persistent Organic Pollutants (POPs) are compounds that are highly toxic to living organisms, persistent in the environment, undergo long distance transport and accumulate in organic-rich phases (sediments and fatty tissues). Given the vulnerability of aquatic ecosystems to pollution and scarcity of data on POPs in Africa and, this thesis examines the level of Organochlorinated Pesticides (OCPs), Polychlorobiphenyls (PCBs) and Polyaromatic hydrocarbons (PAHs) in the Lake Barombi Watershed (LBW) and Wouri Estuary Mangrove (WEM) in Cameroon. In LBW, OCPs detected were endosulfan, hexachlorocyclohexanes (HCHs), dieldrin and aldrin. No OCPs were detected in water and the most frequently detected were HCHs with higher levels in soil than sediments (stream and lake). The α/γ-HCH ratio indicated recent use of lindane. The presence of OCPs is attributed to agriculture and fishing. PAH levels were higher in lake sediments than other samples. Pyrolytic sources of PAHs were predominant specifically combustion of grass, wood or coal. Sediment Quality Guidelines (SQGs) indicated low ecological risks to aquatic life. In the WEM, PAHs levels in sediments were more abundant than Chlorinated Pesticides (CLPs) and PCBs. The most abundant CLPs were endosulfan, alachlor, heptachlor, lindane (γ-HCH) and DDT for which metabolites pattern revealed recent use. PAHs ratios showed a predominant pyrolytic input. The presence of POPs in the WEM is mainly attributed to disease vector control (malaria), municipal waste dumps, industrial emissions and effluents, open burning of wastes, petroleum exploitation and harbour activities. SQGs implied low to moderate predictive biological toxicity
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Частини книг з теми "Wouri estuary"

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Din, Ndongo, Vanessa Maxemilie Ngo-Massou, Guillaume Léopold Essomè-Koum, Eugene Ndema-Nsombo, Ernest Kottè-Mapoko, and Laurant Nyamsi-Moussian. "Impact of Urbanization on the Evolution of Mangrove Ecosystems in the Wouri River Estuary (Douala Cameroon)." In Coastal Wetlands: Alteration and Remediation, 81–131. Cham: Springer International Publishing, 2017. http://dx.doi.org/10.1007/978-3-319-56179-0_3.

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Тези доповідей конференцій з теми "Wouri estuary"

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Agbogun, Henry, Hendratta Ali, Hendratta Ali, Eliot A. Atekwana, Eliot A. Atekwana, Isaac Konfor Njilah, Isaac Konfor Njilah, Jennifer Latimer, and Jennifer Latimer. "ASSESSMENTS OF HEAVY METALS IN SEDIMENT FROM RIVER TRANSECTS IN THE WOURI ESTUARY." In GSA Connects 2021 in Portland, Oregon. Geological Society of America, 2021. http://dx.doi.org/10.1130/abs/2021am-368769.

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Castellano, Sandy, Pauline Agiy, Fabienne Atedjoe, Spencer Gillen, Kesego Pearl Letshele, Hugues Elat Mekong, Lori Elizabeth Huck, et al. "INFLUENCE OF THE WATERSHED GEOLOGY ON RIVER DISCHARGE INTO THE WOURI ESTUARY, CAMEROON." In GSA Connects 2022 meeting in Denver, Colorado. Geological Society of America, 2022. http://dx.doi.org/10.1130/abs/2022am-380045.

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Letshele, Kesego, Pauline Agiy, Fabienne Atedjoe, Sandy Castellano, Spencer Gillen, Lori Huck, Hugues Elat Mekong, et al. "THE TEMPORAL VARIATIONS OF HYDROGEOCHEMISTRY OF A TIDAL MANGROVE CREEK IN THE WOURI ESTUARY, CAMEROON." In GSA Connects 2022 meeting in Denver, Colorado. Geological Society of America, 2022. http://dx.doi.org/10.1130/abs/2022am-380314.

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Gillen, Spencer, Pauline Agiy, Fabienne Atedjoe, Sandy Castellano, Lori Elizabeth Huck, Kesego Pearl Letshele, Hugues Elat Mekong, et al. "EFFECTS OF ANTHROPOGENIC INPUTS IN THE WATERS OF A TIDAL CREEK IN THE WOURI ESTUARY, CAMEROON." In GSA Connects 2022 meeting in Denver, Colorado. Geological Society of America, 2022. http://dx.doi.org/10.1130/abs/2022am-380196.

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N‘Seke, S., B. Bagnérès, R. Lagabrielle, and J. -L. Mattiuzzo. "Flow training dikes for the Wouri estuary in Doula. DC prospection of sand in shallow sea water." In 3rd EEGS Meeting. European Association of Geoscientists & Engineers, 1997. http://dx.doi.org/10.3997/2214-4609.201407307.

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Ramatlapeng, Goabaone, Nicholas T. Counts, Victorine A. Bikuu, Kahnyuy Ella, Diana Carolina Fregoso-Sanchez, Kalyn Compton, Ngameni Youaleu Germaine Corine, et al. "INVESTIGATING THE EFFECTS OF ESTUARINE WATER ON GROUNDWATER QUALITY IN A POPULATED NEIGHBORHOOD IN THE WOURI ESTUARY, CAMEROON." In GSA Annual Meeting in Phoenix, Arizona, USA - 2019. Geological Society of America, 2019. http://dx.doi.org/10.1130/abs/2019am-339660.

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Fregoso-Sanchez, Diana Carolina, Kalyn Compton, Ngameni Youaleu Germaine Corine, Njilah Charles, Goabaone Ramatlapeng, Kahnyuy Ella, Victorine A. Bikuu, et al. "INVESTIGATING THE INFLUENCE OF TIDAL FLUCTUATIONS ON SHALLOW GROUNDWATER CONDITIONS IN A COASTAL NEIGHBORHOOD IN THE WOURI ESTUARY, CAMEROON." In GSA Annual Meeting in Phoenix, Arizona, USA - 2019. Geological Society of America, 2019. http://dx.doi.org/10.1130/abs/2019am-337692.

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