Results 181 to 190 of about 32,835 (209)

Equilibrium versus disequilibrium of barchan dunes

Geomorphology, 2011
Abstract Barchans are crescentic dunes which occur in mainly mono-directional winds. Shape, aspect ratios and velocities of these dunes have been studied as if they were in equilibrium. However, following a study of the shape and migration of 11 barchans of different sizes for 18 months in the field on Moroccan Atlantic Sahara, we show that they only
Hicham El belrhiti, Stéphane Douady
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The ecology of Qatari barchan dunes

Qatar Foundation Annual Research Forum Volume 2013 Issue 1, 2013
The mobile Barchan dunes in Qatar are restricted to the southeastern region of the country. They are currently a disappearing natural habitat, due to the northwesterly Al Shamal winds which are scouring the landscape and spreading desertification as they pass. The study's aim was to understand the ecology of an active dune, in terms of resident species
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Modeling the bistability of barchan and parabolic dunes

Aeolian Research, 2018
Abstract Extensive areas in arid and semi-arid regions of the world are covered by sand dunes. Sand dunes can be active, semi-active, or stable, depending on, among other factors, their vegetation and biogenic crust covers. Vegetation growth on barchan dunes can induce a transformation to parabolic dunes with long trailing arms pointed upwind.
Gershon Hanoch, Hezi Yizhaq, Yosef Ashkenazy   +2 more
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Grain-size variations on a longitudinal dune and a barchan dune

Sedimentary Geology, 1986
Abstract The grain-size characteristics of the sand upon two dunes—a 40 m high longitudinal dune in the central Namib Desert and a 6.0 m high barchan in the Jafurah sand sea of Saudi Arabia—vary with position on the dunes. On the longitudinal dune, median grain size decreases, sorting improves and the grain-size distributions are less skewed and more
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Size Distribution of Barchan Dunes by a Cellular Dune Model

2013
Barchans, which are crescent sand dunes, are observed in desert and on the surface of the Mars. They form barchan field through interaction such as collision processes. In order to investigate dynamics of barchan field, we used cellular dune model. The model includes only saltation and avalanche as the basic sand transport processes.
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Barchan Dunes of Imperial Valley, California

The Journal of Geology, 1966
Three localities with barchans occur in Imperial Valley, California. One group is present in the intradune hollows at the southern end of the large Algodones dune chain along the southeastern side of the valley. The other two localities are west of Salton Sea and include an isolated dune adjacent to Tule Wash and a related dune cluster about 5 miles ...
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Wind Tunnel Simulation of the Aeolian Erosion on the Leeward Side of Barchan Dunes and Its Implications for the Spatial Distribution Patterns of Barchan Dunes

Catena, 2021
Xin Gao, Jiaqiang Lei, Shengyu Li
exaly  

Program Identification Method and Application of Barchan Dune

2021 14th International Congress on Image and Signal Processing, BioMedical Engineering and Informatics (CISP-BMEI), 2021
Huaiyu Wen, Xiaosi Zhou, Yuxin Liu, Bin Yang   +3 more
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Origins of Barchan Dune Asymmetry: Insights From Numerical Simulations

Aeolian Research, 2014
Thorsten Pöschel, Orencio Durán Vinent, Mary Bourke   +2 more
exaly  

barchane dune

2009
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