Environmental variables affecting an arid coastal nebkha

Area of Science:

• Coastal geomorphology
• Eolian geomorphology
• Plant ecology

Background:

• Foredunes in arid coastal systems often form as nebkhas, shaped by vegetation and wind-blown sediment.
• Research on biotic and abiotic interactions in nebkha foredunes is limited compared to continuous foredunes.

Purpose of the Study:

• To investigate factors influencing arid foredunes, specifically focusing on nebkha formation.
• To explore the relationships between morphological, sedimentological, and vegetation characteristics of a Traganum moquinii-formed nebkha.

Main Methods:

• Field measurements of morphological, sedimentological, and vegetation variables across 120 plots on a single nebkha.
• Utilized a two-step multiple linear regression (MLR) analysis to assess variable influences.
• Developed a conceptual model based on empirical results.

Main Results:

• Identified strong correlations between distance from the sea, plant coverage, and sediment patterns.
• Quantified the influence of morphological variables and sea proximity on nebkha characteristics.
• Determined the impact of vegetation on sediment depositional properties.

Conclusions:

• The spatial distribution of bio- and geo-morphological features in arid nebkha foredunes is significantly influenced by proximity to the sea and plant cover.
• Established a conceptual model for understanding nebkha foredune dynamics in arid environments.