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Understanding Seasonal and Spatial Variation of Water Quality Parameters in Mangrove Estuary of the Nyong River Using Multivariate Analysis (Cameroon Southern Atlantic Coast)

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Open Journal of Marine Science 2021年第3期11卷 103-128页

作者： Anselme Crépin Mama willy karol abouga bodo Gisele Flodore Youbouni Ghepdeu Gordon Nwutih Ajonina Jules Rémi Ngoupayou Ndam Department of Oceanography Institute of Fisheries and Aquatic Sciences The University of Douala Douala Cameroon Association of Professionals in Coastal and Aquatics Management Kribi Cameroon Specialized Center for Research on Marine Ecosystems IRAD Kribi Cameroon Cameroon Wildlife Conservation Society Mouanko Cameroon Department of Earth Sciences Faculty of Science University of Yaounde 1 Yaounde Cameroon

To evaluate the actual status of water quality and conclude on the mains source of pollution in the Nyong estuary River, seasonal and spatial variation of water quality parameters was interpreted by multivariate statistical techniques (Principal Component analysis). Nine (09) environmental variables were monitored at four surface stations in the estuary for two seasonal cycles. The fieldwork was conducted from 2018 to 2019 during high tide and low tide for each survey. In situ physical parameters were measured for a total of 64 samples (32 samples for each tide). The laboratory works consisted of some physicochemical analyses and processing of these data by descriptive and multidimensional statistical analyses. Temperature, suspended particle matter, nitrate, nitrite and phosphate change significantly in the estuary with season (p p > 0.05). Principal Component analysis found temperature, salinity, pH, ammonium to be the most important parameters contributing to the fluctuations of surface water quality in the Nyong estuary during the dry seasons whereas suspended particle matter, nitrate, and phosphate are the most important parameters contributing to the fluctuation of surface water quality in the Nyong estuary during the rainy seasons. Based on spatial variation, the Principal Component analysis found that, suspended particle matter, nitrate and phosphate contribute to the fluctuation of surface water quality parameters upstream of the estuary while downstream salinity, pH, and ammonium contribute the most to the fluctuation of surface water quality. This study shows us the usefulness of multivariate statistical techniques used in assessing water quality data sets that would help us in understanding seasonal and spatial variations o

关键词： Water Quality Parameters Nyong Estuary Principal Component Analysis

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Effect of Tide on Temporal and Spatial Distribution of Some Physical and Chemicals Parameters in the Shallow Estuary of the Kienke River (Kribi Deep Sea Port Area, South Cameroon Coast)

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Open Journal of Marine Science 2022年第4期12卷 185-199页

作者： Anselme Crépin Mama willy karol bodo abouga Félix Besack Firmin Landry Tadoum Bah Stéphane Onla Jennifer Cynthia Rachel Sissako Mongue Frédéric Nkolo Mfoula Fabius Kouegan Durand Bernadin Djombe Kammen Dorine Mara Ngo Nola Ginette Thérèse Atoukoh Dingong Laeticia Ingrig Ntangyong Gervais Mani Rose Eulalie Bekono Beyala Josué Junior Manga Tchogom Elcy Rhode Guiadem Lawrence Mbeng Oben Department of Oceanography Institute of Fisheries and Aquatic Sciences The University of Douala Douala Cameroon Association of Professionals in Coastal and Aquatics Management Kribi Cameroon Hydrography Service Dredging Management Unit Port Authority of Douala Douala Cameroon

The aim of this study was to highlight the effect of tide on the variation of the physicochemical parameter in the Kienké estuary. Six (06) environmental variables were monitored at nine (09) stations with the time step of one hour from 7 am to 7 pm on 4th August 2019. The hovmuller analysis showed that salinity, conductivity, total dissolved solids, and pH values increased during the flood phase and decreased during the ebb phase while oxygen concentration decreased during the flood and increased during the ebb phase. The stratification parameter has shown that the influx of seawater during high tide shifts the Kienké estuary from a well-mixed to a partially mixed environment.

关键词： Kienké Estuary Environmental Variables Flood Ebb Stratification Parame-ter

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Effect of Tide on Temporal and Spatial Distribution of Some Physical and Chemicals Parameters in the Shallow Estuary of the Kienke River (Kribi Deep Sea Port Area,South Cameroon Coast)

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Open Journal of Marine Science（海洋科学期刊） 2022年第4期

作者： anselme crépin mama willy karol bodo abouga félix besack firmin landry tadoum bah stéphane onla jennifer cynthia rachel sissako mongue frédéric nkolo mfoula fabius kouegan durand bernadin djombe kammen dorine mara ngo nola ginette thérèse atoukoh dingong laeticia ingrig ntangyong gervais mani rose eulalie bekono beyala josué junior manga tchogom elcy rhode guiadem lawrence mbeng oben

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