Publications - Nezha MEJJAD - Page 1

Tracking natural and human impact on sediment dynamics using radiometric approach in Oualidia lagoon (Morocco)

Nezha MEJJAD Laissaoui, Abdelmourhit Fekri, Ahmed Hassen, Nour El Houda Benmhammed, Ayoub El Hammoumi, Ouafa Benkdad, Azzouz Amsil, Hamid

Published in International Journal of Environmental Analytical Chemistry

Chemical analysis, grain size distribution and short-lived radionuclides (210Pb and 137Cs) were combined to investigate the sedimentary processes in the Oualidia lagoon. Grain size and major elements profiles indicate an unexpected change in the layers characterising 1978 and 1986. Sediment accumulation rates (SAR) depth profiles exhibited the same...

Does Human Activities Growth Lead to Biodiversity Loss in the Moroccan Coastal Lagoons?

Nezha MEJJAD Laissaoui, Abdelmourhit Fekri, Ahmed Benmhammed, Ayoub El Hammoumi, Ouafa Cherif, El Khalil

Published in Proceedings of the 4th Edition of International Conference on Geo-IT and Water Resources 2020, Geo-IT and Water Resources 2020

Over 40% of the world's population lives alongside the coastal zone. Furthermore, the continued increase of many identified and unidentified human activities nearby the coastal environment, such as estuaries, lakes, and lagoons, can harm the fauna, flora, and human health. Coastal environmental quality takes into account physical, chemical, biologi...

Evidence for a recent increase in delivery of atmospheric 210Pb to Oualidia lagoon, coastal Morocco

Laissaoui, Abdelmourhit Mejjad, N. Ziad, N. Ait Bouh, H. El Hammoumi, O. Benkdad, A. Fekri, A. Nezha MEJJAD

Published in Environmental Monitoring and Assessment

Two sediment cores were collected from the Oualidia lagoon, on the Atlantic coast of Morocco, and analyzed for 210Pb and 137Cs activity by gamma spectrometry. The 210Pb profiles were characterized by high activity at specific depths in each core, which were attributed to substantial increases in atmospheric 210Pb input to the sediment. A modified C...

Geochemical, radiometric, and environmental approaches for the assessment of the intensity and chronology of metal conta...

Nezha MEJJAD Laissaoui, Abdelmourhit El-Hammoumi, Ouafa Fekri, Ahmed Amsil, Hamid El-Yahyaoui, Adil Benkdad, Azzouz

Published in Environmental Science and Pollution Research

The present study evaluates the distribution of metals over the last 100 years in the Oualidia lagoon by examining their concentrations in the sediment cores. The samples were analyzed by instrumental neutron activation analysis and inductively coupled plasma mass spectrometry. Activities of 210Pb, 226Ra, and 137Cs were determined by gamma-ray spec...

Evidence of change in 210Pb atmospheric flux in the Oualidia lagoon inferred from sediment radiometric dating

Abdelmourhit Laissaoui Nezha MEJJAD Ouafa El Hammoumi Azzouz Benkdad Ahmed Fekri Ghazi Mustapha

Radiometric dating was carried out on sediment cores from the Oualidia Lagoon located in the north-western of Morocco. The objective of this study was to investigate recent environmental changes in this area, particularly the variation of 210Pb atmospheric flux. Two sediment cores, Core-1 and Core-2, were collected from El Oualidia Lagoon lying in ...

Sediment geochronology and geochemical behavior of major and rare earth elements in the Oualidia Lagoon in the western M...

Nezha MEJJAD Laissaoui, A. El-Hammoumi, O. Benmansour, M. Benbrahim, S. Bounouira, H. Benkdad, A. Bouthir, F. Z. Fekri, A. Bounakhla, M. ...

Published in Journal of Radioanalytical and Nuclear Chemistry

Naturally occurring radionuclides and 137Cs were measured in a sediment core and surface deposit collected from the bed channel of the Oualidia Lagoon located in the western Morocco. Major and rare earth elements (REE) profiles were determined by instrumental NAA technique. 210Pb and 137Cs were used to establish the sedimentation chronology over th...