Sedimentological characteristics and morphology of the aeolian sand dunes in the eastern part of the UAE, a case study from Ar Rub' Al Khali

1999 ◽  
Vol 123 (3-4) ◽  
pp. 219-238 ◽  
Author(s):  
M.I El-Sayed
Keyword(s):  
Sand Dunes ◽  
Aeolian Sand

scholarly journals Research on Key Technologies of Construction Of Tunnel in Aeolian Stratum: A Case Study of Shenmu No. 1 Tunnel

2021 ◽  
Author(s):  
Fei YE ◽  
Xing Liang ◽  
Xiaoming Liang
Keyword(s):  
Sand Dunes ◽  
Cement Grout ◽  
Aeolian Sand ◽  
Engineering Characteristics ◽  
Jet Grouting ◽  
Road Tunnels ◽  
Construction Experience ◽  
Northern Shaanxi ◽  
Grouting Materials

Abstract The naturally formed aeolian sand dunes in northern Shaanxi have unique engineering characteristics. Several difficulties restrict the construction of road tunnels under this stratum, such as the poor self-stabilization ability of the surrounding rock, difficultly in injecting grout, and insufficient construction experience. Therefore, in this study, a case study of the Shenmu No. 1 tunnel was conducted to investigate the engineering characteristics of aeolian sand tunnels, compare the grouting effects of commonly used grouting materials, and discuss the reinforcement effects of different construction schemes in aeolian sand tunnels. Based on a field grouting test, it was found that it is difficult to inject ordinary cement grout into an aeolian sand layer; superfine cement grout and modified sodium silicate grout can be injected, but the former has a poor reinforcement effect. Through numerical analysis, it is found that an approach based on a concept of “horizontal jet grouting pile + benching partial excavation method with a temporary invert” is suitable for the construction of tunnels in aeolian sand in China.

scholarly journals Grouting technology and construction schemes of a tunnel in aeolian stratum: a case study of Shenmu No. 1 tunnel

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Fei Ye ◽  
Xing Liang ◽  
Xiaoming Liang ◽  
Wenjun Zhang ◽  
Chang Liu ◽  
...  
Keyword(s):  
Sand Dunes ◽  
Cement Grout ◽  
Aeolian Sand ◽  
Engineering Characteristics ◽  
Jet Grouting ◽  
Road Tunnels ◽  
Construction Experience ◽  
Northern Shaanxi ◽  
Grouting Materials

AbstractThe naturally formed aeolian sand dunes in northern Shaanxi exhibit unique engineering characteristics. Several challenges, such as the poor self-stabilization ability of the surrounding rock, difficultly in injecting grout, and insufficient construction experience, restrict the construction of road tunnels under this stratum. Therefore, in this study, a case study of the Shenmu No. 1 tunnel was conducted to investigate the engineering characteristics of aeolian sand tunnels, compare the grouting effects of commonly used grouting materials, and discuss the reinforcement effects of different construction schemes in aeolian sand tunnels. Based on a field grouting test, it was determined that it is difficult to inject ordinary cement grout into an aeolian sand layer. Furthermore, it was determined that superfine cement grout and modified sodium silicate grout can be injected, but the former exhibits a poor reinforcement effect. Additionally, results of numerical analysis indicated that an approach based on a concept of “horizontal jet grouting pile + benching partial excavation method with a temporary invert” is suitable for the construction of tunnels in aeolian sand in China.

Cosmolian: High-resolution Integrated OSL and CN modelling Program for Sand Transportation in Eolian Realms (HIPSTER)

2021 ◽  
Author(s):  
Shlomy Vainer ◽  
Yoav Ben Dor
Keyword(s):  
Landscape Evolution ◽  
Sand Dunes ◽  
Integrative Approach ◽  
Model Parameters ◽  
Arid Environments ◽  
Aeolian Transport ◽  
Migration Patterns ◽  
Aeolian Processes ◽  
Simpson Desert

<p>The extensivity of sand dunes in continental interiors makes the understating of their morphodynamical properties valuable for palaeoenvironmental reconstructions and the interpretation of landscape evolution. Nevertheless, the study of aeolian landscape development at the million-years timescale is hampered by the complex interaction of factors determining dune migration and the inherently self-destructive nature of their chronostratigraphy, thus limiting the applicability of traditional luminescence-based dating methods for configuring processes beyond ~300 Ka. In this study, we present a standalone program that simulates aeolian transport based on luminescence-derived chronologies coupled with numerical modelling of cosmogenic nuclides accumulation. This integrative approach reveals ancient phases of sand irruption and provides a data-based scheme facilitating the morphodynamical study of aeolian processes over multiple timescales. We present a case study of the program application by analyzing data from the Australian Simpson Desert, unfolding several phases of aeolian vitality since the late Pliocene. The synchronicity of the results with drastic changes in environmental settings exemplifies the applicability of process-based modelling in constructing a timeframe of key landscape evolution events in arid environments by studying aeolian landforms. Finally, the relationships between model parameters used to determine environmental settings on sand migration patterns make the program a powerful tool to further investigating triggers and mechanisms of aeolian processes.</p>

Is penetration of non-psammophytes an underestimated threat to sand dunes? - a case study from western Pontic coast

2018 ◽  
Vol 23 (2) ◽  
pp. 271-281 ◽  
Author(s):  
Magdalena Valcheva ◽  
Desislava Sopotlieva ◽  
Tenyo Meshinev ◽  
Iva Apostolova
Keyword(s):  
Sand Dunes

scholarly journals Changes in the Environment and Migration in Southern Morocco – Example of the Mhamid Oasis

2008 ◽  
Vol 13 (1) ◽  
pp. 239-250 ◽  
Author(s):  
Karolina Sobczak
Keyword(s):  
Sand Dunes ◽  
Living Conditions ◽  
Desertification Process ◽  
The Subject ◽  
And Migration

Abstract The subject of the article is an analysis of changes in the environment and economy of oases in southern Morocco, on the basis of a case study of Mhamid. The conclusions are that water investments carried out in the Draa Valley intensified the desertification process. This is exemplified by a stronger aeolian deflation, worsening living conditions of the population, limiting of arable areas and finally, migration. Paradoxically, because of desertification, the region has a chance to develop economically because the newly created sand dunes fields stimulate development of tourism.

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