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Sand dunes in the Fachi-Bilma erg (sand sea) in the central-eastern part of the TenA rA
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Sand dunes in the Fachi-Bilma erg (sand sea) in the central-eastern part of the TenA rA
Sand dunes in the Fachi-Bilma erg (sand sea) in the central-eastern part of the Tenere Desert. The Tenere occupies much of southeastern Niger and is considered to be part of the larger Sahara Desert, which stretches across northern Africa.
Two major types of dunes are visible in the image. Large, roughly north-south oriented transverse dunes fill the image frame. This type of dune tends to form at roughly right angles to the dominant, northeasterly winds. The dune crests are marked in this image by darker, steeper sand accumulations that cast shadows. The lighter-toned zones between are lower, interdune flats. The large dunes appear to be highly symmetrical with regard to their crests. This pattern suggests that the crest sediments are coarser, preventing the formation of a steeper slip face on the downwind side of the dune by wind-driven motion of similarly sized sand grains.
This particular form of transverse dune is known as a zibar. A second set of thin linear dunes oriented at roughly right angles to the zibar dunes appears to be formed on the larger landforms and is therefore a younger landscape feature. These dunes appear to be forming from finer grains in the same wind field as the larger zibars
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Media ID 13057359
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Africa Arid Climate Background Desert Dune Field Dune Sea Dunes Full Frame Geography Land Feature Landform Pattern Physical Geography Ridge Sahara Sand Sea Terrain Texture Topography Tenere Transverse View From Space
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EDITORS COMMENTS
This print showcases the mesmerizing beauty of the Fachi-Bilma erg, a vast sand sea nestled in the central-eastern region of the Tenere Desert in Niger. Stretching across southeastern Niger and considered part of the Sahara Desert, this barren landscape is adorned with two distinct types of dunes that dominate the image. The first type, large transverse dunes, can be seen majestically filling the frame from north to south. These magnificent formations are created at right angles to prevailing northeasterly winds. The darker crests of these dunes cast striking shadows against their lighter-toned interdune flats. Their symmetrical appearance suggests that coarser sediments on their crests prevent wind-driven motion from forming steeper slip faces on their downwind sides. Known as zibar dunes, this particular form of transverse dune captivates viewers with its grandeur and harmonious structure. However, another set of linear dunes adds an intriguing element to this already breathtaking scene. Oriented perpendicular to the zibar dunes, these slender formations appear younger and are formed by finer grains carried by the same wind field. This remarkable photograph captures not only nature's artistry but also provides a glimpse into ongoing geological processes shaping our planet's landscapes. With its intricate patterns and contrasting textures, it serves as a testament to both the power and delicacy inherent in Earth's ever-changing natural wonders.
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