Spatial distribution of selected coastal Sabkhas along the Southern Red Sea Coast of Egypt

TL;DR

This study explores the formation and characteristics of coastal salt flats called sabkhas along Egypt's southern Red Sea coast using fieldwork and satellite data.

Contribution

The study provides new insights into the spatial distribution and formation processes of sabkhas using Sentinel-2A imagery and GIS analysis.

Findings

Satellite and field data reveal topographic, hydrological, and sediment features of four sabkhas.

Factors like structural control, wind, and aridity influence sabkha characteristics.

Climate change is identified as a major threat to these ecosystems.

Abstract

Sabkhas are unique salt flat formations situated along the coastline and have been the subject of extensive scientific inquiry. This study delves into the formation and significance of sabkhas, along the South Red Sea coast of Egypt. Combining field observations, satellite imagery, and GIS analysis, the research unveils the processes shaping these distinct landscapes and their broader impact on the region. The study utilizes Sentinel-2 A imagery and digital elevation models to map salinity and identify optimal methods for salt detection. It further employs advanced data processing techniques to refine land cover classification and identify unique features within four sabkhas along the Red Sea coast: Ras Baghdadi, Marsa Abu Madd, Bir Shalatein-Marsa Himeira, and Diib. Examining these sabkhas reveals intricate details of their topography, hydrology, and sediment composition. The study identifies factors contributing to their individual characteristics, such as structural control, interaction with lagoons, and the influence of wind and aridity. Analysis of satellite data and field observations unveils the presence of salt ponds, dunes, microbial mats, and distinct sediment layers within these formations. Evaporite crystals, halophytic vegetation, and color patterns provide further insights into their formation processes. The study emphasizes that sea level fluctuations, fluvial and aeolian processes, and limited human intervention have shaped the temporal evolution of these sabkhas. However, climate change poses significant future challenges. By highlighting the importance of understanding and preserving these ecologically and economically valuable ecosystems, this research underscores the urgent need for their protection in the face of a changing climate.

Figures