Assessment of shoreline dynamics on the Eastern Coast of Algiers (Algeria): a spatiotemporal analysis using in situ measurements and geospatial tools

Arabian Journal of Geosciences - Tập 13 - Trang 1-15 - 2020
Housseyn Otmani1,2, Rabah Belkessa1,2, Soumia Bengoufa1,3, Walid Boukhediche4,5, Noureddine Djerrai1, Katia Abbad1,6
1Ecole Nationale Supérieure des Sciences de la Mer et de l’Aménagement du Littoral (ENSSMAL), Algiers, Algeria
2Laboratoire des Ecosystèmes Marins et Littoraux (EcoSysMarL), Algiers, Algeria
3Laboratoire de Mobilisation et de Valorisation des Ressources en Eau (MVRE), Blida, Algeria
4Université d’Oran 2 Mohamed Ben Ahmed (UMBA), Oran, Algeria
5Laboratoire Espace Géographique et Aménagement du Territoire (EGEAT), Oran, Algeria
6Laboratoire de Conservation et de Valorisation des Ressources Marines (LCVRM), Algiers, Algeria

Tóm tắt

The eastern coast of the Algiers, which stretches over 15 km, is currently experiencing very intense socioeconomic and urban development that is causing severe disturbances to the coastal environment. The main issue of this study concerns itself with understanding the evolutionary trends of this system and assessing its state of vulnerability towards erosion phenomena. This work focuses on the historical study of the variation in the shoreline position by combining photogrammetry data and in situ DGPS measurements (Differential Global Positioning System). Data treatment was carried out using a geographic information system (GIS) and the Digital Shoreline Analysis System (DSAS) geostatistical computing tool. These techniques have enabled identification of the erosion/accretion rates and description of the evolutionary trends over a period of 58 years by calculating the net rates of coastline changes over three time periods (1959–1980, 1980–2003 and 2003–2017). The results show that the net rate fluctuates between sites, with an overall tendency towards erosion (49% of the coastline), associated with a significant variation in the average annual rates. The computed statistics show that the study area was in a state of accretion between 1959 and 1980, with an average end point rate (EPR) equal to 0.72 m/year. This net rate of change turned negative and became alarming during the period between 1980 and 2017 when the EPR decreased to − 0.54 m/year. These trends are due to a combination of the cumulative effects of storms and anthropogenic actions. Hence, sustainable management policies must be developed rapidly by coastal managers to rehabilitate the area.

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Arabian Journal of Geosciences

Tập 13

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