Multi-date tidal delta morphodynamics of the Oualidia lagoon: Decadal and annual scale change assessment

Khalid EL KHALIDI, Mohammed BOUCHKARA, Nezha MEJJAD, Karim HILMI, Khalid MEHDI, Mohammed SAHABI, Mohammed IDRISSI, Bendahhou ZOURARAH

Abstract


Changes in sedimentation and morphology of the tidal delta and adjacent beaches of the Oualidia lagoon were studied using bathymetric data and aerial photographs. This lagoon has been classified as a RAMSAR site since 2005, offering great ecological and socio-economic value for the local population. However, in recent decades, the Oualidia lagoon has suffered from several types of degradation, including the water and sediment containmentphenomenon. The present study evaluates the evolution of the morphological and sedimentary change of the downstream area of this lagoon on a 10-year time scale between 2006 and 2016. Bathymetric data and aerial photos showed good agreement and provided a large number of interesting results in terms of sedimentary and morphological changes in the downstream area of the lagoon. Thus, the notable changes mainly concern three morphological units of the lagoon, namely the tidal delta, the adjacent beaches and the main channel. These changes are related to natural (hydrodynamics, waves, currents...) and anthropogenic (dikes, sediment traps...) factors. This study assessed the anthropogenic actions and their impacts to support effective decision-making.

Keywords


Tidal delta; Morphodynamic; Topo-bathymetry; Photo-interpretation; Oualidia lagoon

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References


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DOI: https://doi.org/10.34874/IMIST.PRSM/fsejournal-v12i1.30377

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