Ripples, transverse aeolian ridges, and dark‐toned sand dunes on Mars: A case study in Terra Sabaea

2021 ◽  
Author(s):  
Y. Lu ◽  
K. S. Edgett ◽  
Y. Z. Wu
Keyword(s):  
Sand Dunes

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.

scholarly journals Vertical ground movements in the Polish and Lithuanian Baltic coastal area as measured by satellite interferometry

Baltica ◽  
2015 ◽  
Vol 28 (2) ◽  
pp. 65-80
Author(s):  
Marek Graniczny ◽  
Jolanta Čyžienė ◽  
Freek van Leijen ◽  
Vytautas Minkevičius ◽  
Vidas Mikulėnas ◽  
...  
Keyword(s):  
Sand Dunes ◽  
Ground Surface ◽  
Radar Data ◽  
Deformation Model ◽  
Geological Interpretation ◽  
Ground Movements ◽  
Baltic Coast ◽  
Vertical Ground ◽  
Tectonic Features

The article contains results obtained from realization of the Polish and Lithuanian Baltic case study within the EU – FP 7 SubCoast project, which one of the primary aims was analysis of vertical ground movements, potentially causing geohazards in the coastal areas. To reach this goal Interferometric Synthetic Aperture Radar (InSAR) data were obtained. For the Polish and Lithuanian Baltic coast ERS archive radar data were processed in order to provide Permanent Scatterer (PSInSAR, PSI) results that were then used to create the new innovative product – Dynamic DEM (DDEM). The deformation model defined by the SubCoast project normally needs to be created by merging InSAR, satellite navigation (GNSS), optical leveling and/or gravimetry measurements. Elaboration of DDEM enables more effective comparison between PS and tectonic features. Comparison of PS time series with groundwater changes shows a direct correlation, confirming impact of groundwater on subsidence or uplift of the ground surface. The results of the geological interpretation demonstrated that the examples of movements detected by PSI include subsidence linked to deformation of engineering constructions, compaction of organic or weak soils, and eolian accumulation or deflation processes of the sand dunes. For the Polish and Lithuanian coasts most of the area proved to be stable, nevertheless some local deviations up to –15 mm per year of movement were found.

scholarly journals INVESTIGATION OF GEOTECHNICAL SPECIFICATIONS OF SAND DUNE SOIL: A CASE STUDY AROUND BAIJI IN IRAQ

2013 ◽  
Vol 14 (2) ◽  
Author(s):  
Abbas J. Al-Taie ◽  
Yousif J. Al-Shakarchi ◽  
Ali A Mohammed
Keyword(s):  
Land Surface ◽  
Sand Dune ◽  
Sand Dunes ◽  
Engineering Properties ◽  
X Ray Diffraction ◽  
X Ray ◽  
Strength Tests ◽  
Physical Tests ◽  
Dune Soil

ABSTRACT: While more than half the land surface of Iraq consists of deserts covered mainly with sand dunes, little research has taken place to study the characteristics and the behavior of dune soils. This paper directed toward studying the geotechnical properties of dune sands taken from Baiji city (northwest of Iraq). A vast laboratory testing program was carried out to achieve the purpose of this paper. The physical tests, chemical tests, X-ray diffraction analysis, permeability test, compaction characteristics, compressibility and collapsibility tests; and shear strength tests were included in this program. The results indicate that soil of Baiji sand dune exhibits prefer engineering properties according to their state. As such, this soil is considered suitable for use in geotechnical constructions. ABSTRAK: Walaupun lebih separuh daripada bumi Iraq terdiri daripada gurun yang dipenuhi dengan bukit-bukit pasir, tidak banyak penyelidikan dijalankan untuk mengkaji sifat-sifat dan ciri-ciri tanah pasir  tersebut. Kertas kerja ini menyelidik sifat geoteknikal bukit pasir yang diambil dari pekan Baiji (di bahagian barat utara Iraq).  Program penyelidikan makmal yang menyeluruh telah  dijalankan bagi mencapai objektif kajian ini. Ujian fizikal, ujian kimia, analisis belauan sinar-x, ujian kebolehtelapan, ciri pemadatan, faktor ketermampatan, ujian keruntuhan dan ujian kekuatan ricih diambilkira dalam program ini. Keputusan menunjukkan bahawa tanih bukit pasir Baiji mengutamakan ciri kejuruteraan berdasarkan keadaannya. Oleh itu, tanah ini dianggap sesuai untuk kegunaan pembinaan geoteknikal.

scholarly journals A Case Study of Moving Sand Dunes: The Barchans of the Kharga Oasis

2013 ◽  
Vol -1 (08) ◽  
pp. 95-97 ◽  
Author(s):  
Amelia Carolina Sparavigna
Keyword(s):  
Sand Dunes ◽  
Kharga Oasis
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