scholarly journals Study of Black Sand Particles from Sand Dunes in Badr, Saudi Arabia Using Electron Microscopy

Atmosphere ◽  
2015 ◽  
Vol 6 (8) ◽  
pp. 1175-1194 ◽  
Author(s):  
Haider Khwaja ◽  
Omar Aburizaiza ◽  
Daniel Hershey ◽  
Azhar Siddique ◽  
David E. ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Saudi Arabia ◽  
Sand Dunes ◽  
Black Sand ◽  
Sand Particles

Mapping the internal structure of sand dunes with GPR: A case history from the Jafurah sand sea of eastern Saudi Arabia

2008 ◽  
Vol 27 (11) ◽  
pp. 1446-1452 ◽  
Author(s):  
Ademola Q. Adetunji ◽  
Abdullatif Al-Shuhail ◽  
Gabor Korvin
Keyword(s):  
Saudi Arabia ◽  
Internal Structure ◽  
Case History ◽  
Sand Dunes

scholarly journals Integrated Geological, Hydrogeological, and Geophysical Investigations of a Barchan Sand Dune in the Eastern Region of Saudi Arabia

Water ◽  
2020 ◽  
Vol 12 (3) ◽  
pp. 682
Author(s):  
Mohammed Benaafi ◽  
Sherif M. Hanafy ◽  
Abdullatif Al-Shuhail ◽  
Ammar El-Husseiny ◽  
Jack Dvorkin
Keyword(s):  
Grain Size ◽  
Saudi Arabia ◽  
Water Content ◽  
Sand Dune ◽  
Sand Dunes ◽  
Homogeneous Medium ◽  
Eastern Region ◽  
Large Area ◽  
Electrical Resistivity Survey ◽  
Dune Crest

In arid countries such as Saudi Arabia, aeolian sand often covers a large area of the country. Understanding the variations of sand properties in dunes, including grain size, sorting, mineral composition and water content, can be important for groundwater recharge, environmental, and construction applications. Earlier studies examined properties of sand dunes by collecting samples from the surface. This study aims to investigate variations of sand properties within a Barchan sand dune in the coastal area of Saudi Arabia, by collecting samples and measurements from two vertically drilled boreholes up to the ground water level; one drilled in the dune crest and another one in the limb. Representative samples were collected and analyzed for their texture parameters, water content, and mineralogy. Electrical resistivity survey data was also acquired to map water content variation in the dune limb, and for comparison with well bore data. The reported results show no vertical variations in grain size or sorting in the dune crest. In contrast, the upper 0.5 m of the dune limb shows a relatively poorer sorting than found in deeper parts of the dune. Laterally, no variations in minerology were observed between crest and limb sands while grain size tended to be slightly coarser in the dune limb compared to the crest. Regarding the water content, it was found to vary vertically, probably due to previous cycles of rainfall infiltration through the sand body. Such observed variation in water content is consistent with the measured resistivity profile which could clearly identify the water table and areas with higher water content. This study concludes that beyond the upper 0.5 m, the Barchan sand dune body can be treated as a homogeneous medium in terms of mineralogy and sorting while grain size increases slightly toward the limb side.

scholarly journals Taxonomic justification of the pathogenic strongylid infecting the Arabian camel Camelus dromedarius as Haemonchus longistipes by morphological and molecular phylogeny

2019 ◽  
Vol 63 (1) ◽  
pp. 51-61
Author(s):  
Saad Dajem ◽  
Kareem Morsy ◽  
Mohammed Al-Kahtani ◽  
Rewaida Abdel-Gaber
Keyword(s):  
Electron Microscopy ◽  
Saudi Arabia ◽  
Maximum Likelihood ◽  
Sequence Alignment ◽  
Maximum Likelihood Analysis ◽  
Phylogenetic Information ◽  
Multiple Sequence ◽  
Rdna Sequences ◽  
Likelihood Analysis ◽  
Arabian Camel

Abstract Introduction: There is still lack of morphological and phylogenetic information on the pathogenic nematode of the camel Haemonchus longistipes. In the present study, this parasite was isolated in Saudi Arabia and described. Material and Methods: The abomasa of two Arabian camels were collected from a slaughterhouse in Abha province and examined for nematode infection. Worms were described morphologically and morphometrically by electron microscopy. Multiple sequence alignment and the phylogenetic tree of the parasite were constructed from maximum likelihood analysis of its ITS-2 rDNA sequences. Results: These nematodes had a slender body terminating anteriorly at a conspicuous dorsal lancet. A pair of lateral cervical papillae distant from the anterior end was observed. The buccal aperture was hexagonal and surrounded by two amphids, six externo-labial papillae, and four cephalic papillae. Males terminated posteriorly at a bursa supported by spicules and lateral and dorsal rays. Females were linguiform and knobbed morphotypes with distinct ovijectors and a dorsal rim covering the anal pore. The taxonomy was confirmed by the morphology and number of the longitudinal cuticular ridges in a 43–46 range. The sequence alignment and phylogeny revealed 92% homology with H. longistipes (AJ577461.1), and the sequence was deposited into GenBank. Conclusion: The present study describes H. longistipes morphologically and molecularly which facilitates further discrimination of this species worldwide.

The status and ecology of the sand cat in the Uruq Bani Ma’arid Protected Area, Empty Quarter of Saudi Arabia

Mammalia ◽  
2021 ◽  
Vol 0 (0) ◽  
Author(s):  
Rajan Amin ◽  
Tim Wacher ◽  
Tom Bruce ◽  
Chris Barichievy
Keyword(s):  
Saudi Arabia ◽  
Protected Area ◽  
Sand Dunes ◽  
Camera Traps ◽  
Core Area ◽  
Cool Season ◽  
Dune System ◽  
The Status ◽  
Hot Season ◽  
Sand Cat

Abstract The sand cat is one of the world’s least studied small cats. Our camera-trap survey, one of the largest undertaken in a desert system, generated over 1500 images of the species across 100 camera-traps distributed systematically over the 2400 km2 core area of the Uruq Bani Ma’arid Protected Area of the Empty Quarter, Saudi Arabia. The study revealed a much more significant and widespread sand cat population in the ecosystem than previously understood. Sand cats were detected across one-third of the core area in all major habitats, comprising escarpment plateau, sand dunes and interdunal gravel valleys. The species showed a marginal preference for the interior parallel dune system with interspersed gravel valleys where they also preferred sand dunes over the gravel valley in the hot season. There was no evidence of strong spatial interactions with other predators. The ecosystem’s larger predators (Arabian red fox and honey badger, and all records of wild and feral cats) were primarily associated with the escarpment plateau. The smaller Rueppell’s fox was the only other carnivore more consistently present in the main dune system. Sand cats were strictly nocturnal and 14% more active in the hot season than the cool season.

Mitigating the effects of sand dunes on seismic data from the Rub al Khali basin, Saudi Arabia

2019 ◽  
Vol 67 (7) ◽  
pp. 1825-1837 ◽  
Author(s):  
Mustafa Al‐Marzooq ◽  
Mamadou S. Diallo ◽  
Vincent Etienne ◽  
Thierry Tonellot ◽  
SanLinn I. Kaka
Keyword(s):  
Saudi Arabia ◽  
Seismic Data ◽  
Sand Dunes
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