Granulometric Indices Mapping in Relation to Hydrodynamic Factors for Beach Characterization and Monitoring with Very High Spatial Resolution

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Published Dec 22, 2020

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Karima Remmache
The National School of Marine Sciences and Coastal Management (ENSSMAL), Campus Dely Ibrahim Bois des Cars, Algiers, Algeria
Nour El Islam Bachari
Faculty of Biological Sciences, University of Science and Technology of Houari Boumedien (USTHB), PO Box 32, El Alia, Bab Ezzouar, 16111 Algiers, Algeria
Lamri Nacef
Faculty of Biological Sciences, University of Science and Technology of Houari Boumedien (USTHB), PO Box 32, El Alia, Bab Ezzouar, 16111 Algiers, Algeria
Fouzia Houma
The National School of Marine Sciences and Coastal Management (ENSSMAL), Campus Dely Ibrahim Bois des Cars, Algiers, Algeria

Abstract

The objective of this article is the spatiotemporal monitoring of coastline and beaches in relation to hydrodynamics and sediment dynamics. Since the study area is local, it is important to carry out a very high spatial resolution study. To achieve our goal we used satellite images with a spatial resolution of 0.2 m on the one hand and the high-resolution SWAN model on the other hand. We have transformed satellite images into coastlines. For the diachronic study we used ArcGIS to create a mosaic of images, to rectify these mosaics and to calculate the distances separating the coastlines taken on different dates. We observed the presence of erosion/accretion on several beaches. This evolution can be explained by the effect of the maritime structures and the contributions of the wadis. Wave energies are distributed unevenly along the coast due to the bathymetry of the area and the orientation of the coastline. The study of the sedimentary dynamics based on the granulometric study of the surface sediments and the extrapolation of the different granulometric indices under ArcGIS allowed us to show the distribution of different sedimentary facies on the surfaces of the studied beaches. We noticed a concordance between the distribution of wave energies and the evolution of the coastline. On the other hand, the combination of the results obtained and the granulometric analysis allowed us to explain the distribution of sedimentary classes.

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How to Cite
[1]
K. Remmache, N. E. I. Bachari, L. Nacef, and F. Houma, “Granulometric Indices Mapping in Relation to Hydrodynamic Factors for Beach Characterization and Monitoring with Very High Spatial Resolution”, DataSCI, vol. 3, no. 1, pp. 5-12, Dec. 2020.
Issue
Vol 3 No 1 (2020)
Section
Research Articles

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