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Your search keyword '"Kemgang Ghomsi, Franck Eitel"' showing total 21 results
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21 results on '"Kemgang Ghomsi, Franck Eitel"'

13. Performance assessment of daily GR conceptual rainfall-runoff models in the Upper Benue River (Cameroon) using airGR packages.

Author

Nonki, Rodric Mérimé, Amoussou, Ernest, Tshimanga, Raphael Muamba, Koubodana Houteta, Djan'na, Kodja, Domiho Japhet, Kemgang Ghomsi, Franck Eitel, and Lenouo, André

Subjects
WATER management, CONCEPTUAL models, HYDROLOGIC models, MODEL validation
Abstract

Many hydrological applications employ conceptual-lumped rainfall-runoff models to support water resource management techniques. Because of their ability to exploit minimal data and provide enough credible information, they provide an edge in data-scarce domains. The purpose of this research is to evaluate the feasibility of using multiple rainfall-runoff hydrologic models Génie Rural à 4, 5, 6 paramètres Journalier (GR4J, GR5J, and GR6J) in the Upper Benue River (UBR) in Northern Cameroon. The models were calibrated using Michel's calibration algorithm implemented in airGR packages, while considering different objective functions (NSE, KGE, composite criterion). The objective here was to find the optimum objective function that takes into account the various components of the hydrographs in this watershed and to assess the impact of the chosen objective function on parameter optimization. The results reveal that the model performance as well as the optimized parameters of the different GR models vary according to the selected objective function. According to the study, adopting the composite criterion as an objective function during model calibration improves model accuracy. The model's performance reveals that two of the three models (GR5J and GR6J) reproduced the discharge well in the considered catchment, with NSE and KGE greater than 0.62 during the model validation. This highlights how these two GR models can be applied to various water management concerns in the UBR. [ABSTRACT FROM AUTHOR]

Published
2024
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18. Characteristics and Source Identification of Environmental Trace Metals in Beach Sediments Along the Littoral Zone of Cameroon

Author

Ekoa Bessa, Armel Zacharie, primary, Ambassa Bela, Victorine, additional, Ngueutchoua, Gabriel, additional, El‑Amier, Yasser A., additional, Aonsi Kamani, Francis, additional, Ngueudong Zebaze, Leonel, additional, Kamguem Fotso, Christelle Aimée, additional, Njimanu Njong, Vanisa, additional, Kemgang Ghomsi, Franck Eitel, additional, Valipour, Mohammad, additional, and Armstrong‑Altrin, John S., additional

Published
2021
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20. The influence of tropical Indian Ocean warming and Indian Ocean Dipole on the surface chlorophyll concentration in the eastern Arabian Sea

Author

Dmitry Kondrik, Kemgang Ghomsi Franck Eitel, Syam Sankar, Anoop Thondithala Ramachandran, Ramesh Madipally, Radharani Sen, and Lasse H. Pettersson

Subjects
Chlorophyll concentration, Indian ocean, Oceanography, 010504 meteorology & atmospheric sciences, Global warming, Period (geology), Environmental science, Upwelling, Forcing (mathematics), Indian Ocean Dipole, Structural basin, 01 natural sciences, 0105 earth and related environmental sciences
Abstract

This study examines the role of increased Indian Ocean warming and positive Indian Ocean Dipole (IOD) events on the surface chlorophyll concentration in the Eastern Arabian Sea (EAS) during the period 1998 to 2014. Remotely sensed surface chlorophyll concentration – during the month of October when IOD strength is maximum – at three selected areas in the EAS, viz., the central eastern Arabian Sea (CEAS, 73° E–76° E, 13° N–18° N), south eastern Arabian Sea (SEAS, 74° E–77° E, 8° N–13° N) and the southern tip of India (TIP, 74° E–78° E, 5° N–8° N) shows a steady decreasing trend, though not statistically significant. The EAS also has a higher warming trend when compared to the western basin during the study period. Our analysis has shown that in the EAS, local surface winds, remote forcing by equatorial winds and the surface and sub-surface oceanic circulation features are less (respectively more) favorable for inducing coastal upwelling during positive (respectively negative) IOD years. The Dipole Mode Index (DMI) and surface chlorophyll concentration in the EAS is significantly and negatively correlated, pointing to the fact that in the event of occurrence of frequent positive IOD years under a global warming regime, the surface chlorophyll concentration is likely to decrease during fall.

Published
2019

21. A comparative study on trend surface analysis (TSA), wavelet filtering and bi-dimensional empirical mode decomposition (BEMD) for gravity anomaly separation

Author

Kemgang Ghomsi Franck Eitel, Animesh Mandal, and Shankho Niyogi

Subjects
Gravity (chemistry), 010504 meteorology & atmospheric sciences, business.industry, Separation (statistics), 010502 geochemistry & geophysics, Machine learning, computer.software_genre, 01 natural sciences, Gravity anomaly, Hilbert–Huang transform, Interpretation (model theory), Wavelet filtering, Trend surface analysis, Statistical physics, Artificial intelligence, business, computer, Geology, 0105 earth and related environmental sciences
Published
2017

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