Polymers for stabilisation of Wahiba dune sands, Oman

2019 ◽  
Vol 172 (2) ◽  
pp. 76-84 ◽  
Author(s):  
Yahia Mohamedzein ◽  
Abdulaziz Al-Hashmi ◽  
Aisha Al-Abri ◽  
Amira Al-Shereiqi
Keyword(s):  
Dune Sands

Properties of high strength concrete using white and dune sands under normal and autoclaved curing

2012 ◽  
Vol 27 (1) ◽  
pp. 218-222 ◽  
Author(s):  
A. Alhozaimy ◽  
M.S. Jaafar ◽  
A. Al-Negheimish ◽  
A. Abdullah ◽  
Y.H. Taufiq-Yap ◽  
...  
Keyword(s):  
High Strength Concrete ◽  
High Strength ◽  
Dune Sands ◽  
Strength Concrete

scholarly journals Holocene Stratigraphy and Geomorphology of Flintstone Hill, Lauder Sandhills, Glacial Lake Hind Basin, Southwestern Manitoba

2004 ◽  
Vol 56 (2-3) ◽  
pp. 291-303 ◽  
Author(s):  
Garry L. Running ◽  
Karen G. Havholm ◽  
Matt Boyd ◽  
Dion J. Wiseman
Keyword(s):  
River Channel ◽  
Low Energy ◽  
Glacial Lake ◽  
Wind Regime ◽  
Wet Meadows ◽  
Dune Sands ◽  
Eolian Sand ◽  
Holocene Stratigraphy ◽  
Modern Landscape ◽  
Sand Sheets

Abstract Sediments exposed at Flintstone Hill in a Souris River cutbank provide the most complete postglacial stratigraphic section in the Glacial Lake Hind Basin (GLHB), southwestern Manitoba. Four lithologic units, A-D, are observed: A1 (~2 m thick), glaciolacustrine silts and clays that grade upward to peat and record final regression of Glacial Lake Hind (~10 500-9300 BP); A2 (~1.5 m thick), low energy fluvial marl and silts grading to O-horizon(s) (by 6700 BP); B (1.5 m thick), dune sands that migrated from the southwest, contrary to the modern wind regime (after ~6700 BP); C (1.0 m thick), thin fluvial deposit between eolian sand sheets (~5500-3200 BP); D (up to 7 m thick), parabolic dune on the modern landscape oriented consistent with the modern wind regime, blowouts suggest episodic dune reactivation (~3200 BP to present). Overall, Flintstone Hill deposits record draining of Glacial Lake Hind, establishment of the Souris River channel through the GLHB, mid-Holocene eolian activity / landscape instability greater than present, and a return to nearly modern conditions by ~5400 BP. Native inhabitants in the GLHB focused on exploiting wetlands and wet meadows before 9300 BP and a landscape similar to the present thereafter.

scholarly journals Using Cement By-Pass Dust and Fine Dune Sands in Semi-Flexible Pavement Applications

2016 ◽  
Vol 21 (1) ◽  
pp. 19-23
Author(s):  
M Shalaby ◽  
M Al-Taher ◽  
A Mohamady ◽  
M Attia
Keyword(s):  
Flexible Pavement ◽  
Dune Sands

Erosional sand columns in dune sands, Cape Sable Island, Nova Scotia, Canada

1969 ◽  
Vol 6 (2) ◽  
pp. 344-347 ◽  
Author(s):  
Rudolf A. Gees ◽  
Anil K. Lyall
Keyword(s):  
Nova Scotia ◽  
Water Erosion ◽  
Dune Sands ◽  
Wind And Water Erosion

Miniature sand columns eroded into crossbedded dune sands are described. Apparently the columns formed after the spring thaw by wind and water erosion.

Textural and compositional controls on modern beach and dune sands, New Zealand

2007 ◽  
Vol 32 (3) ◽  
pp. 366-389 ◽  
Author(s):  
J. J. Kasper-Zubillaga ◽  
G. Ortiz-Zamora ◽  
W. W. Dickinson ◽  
J. Urrutia-Fucugauchi ◽  
A. M. Soler-Arechalde
Keyword(s):  
New Zealand ◽  
Dune Sands

A broadly sampled 3-loci plastid phylogeny of Atraphaxis (Polygoneae, Polygonoideae, Polygonaceae) reveals new taxa: II. Atraphaxis selengensis spec. nov., and A. davurica Jaub. & Spach from Russian Transbaikalia

Phytotaxa ◽  
2021 ◽  
Vol 484 (1) ◽  
pp. 44-74
Author(s):  
OLGA V. YURTSEVA ◽  
N.K. BADMAEVA ◽  
EVGENY V. MAVRODIEV
Keyword(s):  
Maximum Likelihood ◽  
Nucleotide Substitution ◽  
Single Nucleotide Substitution ◽  
Sem Images ◽  
Single Nucleotide ◽  
Bayesian Analyses ◽  
Dune Sands ◽  
F Region ◽  
Specific Morphology ◽  
Length Width

Maximum Likelihood (ML) and Bayesian analyses (BI) applied for 3-plastid loci (cpDNA trnL(UAA) intron, trnL–trnF IGS, and rpl32–trnL(UAG) IGS regions) / 55 tips of Atraphaxis revealed a subclade of two endemics from Transbaikalia (Dahuria) which are often mistaken for A. pungens and A. frutescens but phylogenetically distant from both. Atraphaxis selengensis is a species new to science which inhabits dune sands along the Selenga and Chikoy rivers and has specific morphology of perianth, fruits, ochreas, leaf blades, and pollen. Atraphaxis davurica inhabits stony mountain steppe in Buryatia and Chita region and differs from A. pungens and A. frutescens by longer ochreas, fruits, styles and stigmas extended to ends. Two varieties recognized by Ledebour in plants from Russian Transbaikalia have no clear morphological and molecular distinctions, but the plants from Khentei-Chikoy Highlands subtly differ in leaf ratio (length/width), bark colour, and a single-nucleotide substitution in trnL–F region. These plants are described as A. davurica var. chikoensis var. nov. Morphological descriptions of A. selengensis and A. davurica are supplied with LM and SEM images and a distributional map. Atraphaxis frutescens and A. pungens are absent from Russian Transbaikalia but distributed in Altai, Tuva, Khakassia, Mongolia and China.

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