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

Chemical analysis, grain size distribution and short-lived radionuclides ( 210 Pb and 137 Cs) 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 accum...

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Bibliographic Details
Published in:International journal of environmental analytical chemistry 2022-12, Vol.102 (16), p.4300-4315
Main Authors: Mejjad, Nezha, Laissaoui, Abdelmourhit, Fekri, Ahmed, Hassen, Nour El Houda, Benmhammed, Ayoub, El Hammoumi, Ouafa, Benkdad, Azzouz, Amsil, Hamid
Format: Article
Language:English
Subjects:
Anthropogenic factors
Caesium 137
Cesium 137
Cesium isotopes
Cesium radioisotopes
Chemical analysis
Depth profiling
Grain size
Grain size distribution
Human impact
Human influences
Hydrodynamics
Lagoons
Lead isotopes
major element
Major elements
modified CRS model
Particle size
Radioisotopes
radiometric dating
Radionuclide kinetics
Sediment
Sediment accumulation rate
sediment core
Sediment dynamics
Sediments
Size distribution
Tracking
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Summary:Chemical analysis, grain size distribution and short-lived radionuclides ( 210 Pb and 137 Cs) 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 behaviour and revealed two different sediment deposition conditions or regimes, involving modification of this ecosystem equilibrium. The profiles of major elements behave vertically almost the same as SAR, and grain size distribution. The observed changes reflect modifications in sediments supply and ecosystem drivers due to the variation of hydrodynamics conditions, confinement phenomena located in the upstream zone of the lagoon and to the various anthropogenic activities around the Oualidia lagoon.
ISSN:0306-7319
1029-0397
DOI:10.1080/03067319.2020.1782394