Author(s): Iouzzi Nisrine

Linked Author(s):

Keywords: Hydro-sedimentary modeling; Wave; Calibration dikes; Kenitra coastline; Estuary

Abstract: The coastal area of Mehdia city, part ofKenitra provinceis one of the most fragile and complex spaces along the Moroccan coastline. The objective of this work is to provide knowledge on processes controlling the evolution of the coastal hydro-sedimentary system at the outlet of Sebou River. Coastal transport at the level of the study site is sensitive to different forcing: wind, tide, swell, river flows, general circulation or panache circulation. The river of Sebou, as well as its floodplains, has been the subject of several coastal developments, including calibration breakwaters, spikes, dune development and channel dredging. The hydro-sedimentary modeling of the site began first with the constitution of a database of sea data based on measurements from satellite images coupled with models allowing the reconstitution of a sufficient duration of directional spectra, in addition to bibliographical studies. The results showed that there are two wave regimes: N225°-250° and N280°-340°, the latter being the predominant wave. The wind regime is characterized in winter by a strong wind (>9m/s) coming from the South-West to West sector, while in summer the strongest wind (>9m/s) comes from the West and North sectors, with an occurrence of 3% for both.The results of the granulometric analyses carried out in the site show a D50 of about 28% and D10 of about 16%. Site modeling took into consideration the available bathymetry in order to develop future operating scenarios. The natural and entropic environment of this site is presented in the three parts: - Hydrodynamics by defining the swell at the entrance to the estuary from offshore data. - The evolution of the coastline in the presence of two dykes for channeling the river flow. - The quantification of the energy incident on the structures of the estuary.

DOI: https://doi.org/10.3850/IAHR-39WC252171192022346

Year: 2022