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Related Experiment Video

Updated: May 13, 2026

Kinematic History of a Salient-recess Junction Explored through a Combined Approach of Field Data and Analog Sandbox Modeling

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Biogenic crust dynamics on sand dunes.

Shai Kinast¹, Ehud Meron, Hezi Yizhaq

¹Department of Solar Energy and Environmental Physics, Blaustein Institutes for Desert Research, Ben-Gurion University of the Negev, Sede Boqer Campus 84990, Israel.

Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics

|March 19, 2013

Summary

Biogenic crusts and vegetation stabilize sand dunes. Our model reveals distinct dune states, like vegetated or active dunes, depending on rainfall and wind, suggesting new desertification pathways.

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Area of Science:

Geomorphology
Ecology
Environmental Science

Background:

Sand dunes are dynamic landscapes crucial for coastal and arid environments.
Vegetation and biogenic crusts significantly influence dune stability and morphology.
Previous dune dynamic models have largely overlooked the role of biogenic crusts.

Purpose of the Study:

To investigate the impact of biogenic crusts on sand dune stability.
To model the different states of dune cover (crusted, vegetated, active) under varying environmental conditions.
To explore the potential for alternative stable states in dune systems.

Main Methods:

Development of a simplified model of dune dynamics.
Analysis of dune-cover states across gradients of rainfall and wind power.
Identification of stability ranges for different dune-cover configurations.

Main Results:

Two distinct ranges of alternative stable states were identified.
At low wind power, dunes can exist as either fixed crusted or fixed vegetated states.
At high wind power, dunes shift to either fixed vegetated or active states.

Conclusions:

Biogenic crusts play a critical role in dune stabilization, comparable to vegetation.
The model demonstrates how changes in rainfall and wind can lead to shifts between stable dune states.
These findings suggest a potential crossover between different forms of desertification, highlighting the importance of considering crusts in ecosystem management.