Results from a three-year study are presented that integrate field work (in Israel), physical modeling (wind-tunnel testing at UC Davis), and numerical solutions of grain trajectories to model and explain sand transport over a climbing dune. Field grain-size analyses of surfaceand saltation-trap materials taken along various positions of the slope suggest that only smaller particles (< 230 pm i...

Introduction: THEMIS and MOC images acquired over the Chasma Boreale contain key geologic and stratigraphic information relating to aeolian deposition and the Polar Layered Deposits (PLD). Preliminary analyses of THEMIS VIS and MOC images show a clear progression of morphologic change of dark albedo dune deposits along the chasma axis. Geologic Relations: The source for the dunes appears to be ...

Irreplaceable, self-organizing landforms and the endemic and ecologically specialized biodiversity they support are threatened globally by anthropogenic disturbances. Although the outcome of disrupting landforms is somewhat understood, little information exists that documents population consequences of landform disturbance on endemic biodiversity. Conservation strategies for species dependent u...

Differences in the composition of aeolian sand at Big Dune and Lava that is mixed with basalt various minerals may affect water retention development insects are specialized for living environments. These two dunes, located Nye County, Nevada, home to endemic dune scarab beetle, Pseudocotalpa giulianii (PSGU). The differences type influence growth patterns eggs larvae this beetle species hatche...

introduction movement of sand dunes is an important natural threat in the coast of oman sea. now many rural settlements of the region are in threat, and vulnerability has caused heavy losses. the sand dunes are visible in the wide area and wind erosion occurs in a wide spatial scale. wind erosion faces high intensity in the area, because of poor vegetation, low rainfall, dry soil, strong and co...

The main objective of this study is to compare the mechanical behavior two sands (Hostun or Dune sands) mixed with crushed rubber obtained from used tires. However, it essential ensure that his geotechnical application do not result in long-term negative impacts on environment. chemical properties these are given by energy dispersive analysis X-ray fluorescence spectrometry. mineral composition...

The massive dune sea of the southern Namib Desert is approximately 800 km in length and some 140 km wide. These dunes are among the highest in the world and, in spite of very sparse vegetation cover, they support a surprising variety of reptiles and arthropods (Koch, 1961; Louw & Seely, 1982). A feature of the arthropod fauna is the high species diversity of flightless tenebrionid beetles. Thes...

Burrowed aestivating frogs of the cocoon-forming species Neobatrachus aquilonius and the non-cocooning species Notaden nichollsi were excavated in the Gibson Desert of central Australia. Their hydration state (osmotic pressure of the plasma and urine) was compared to the moisture content and water potential of the surrounding soil. The non-cocooning N. nichollsi was consistently found in sand d...

Dune recovery interventions that integrate natural, sustainable, and soft solutions have become increasingly popular in coastal communities. In the present study, reliability of an innovative non-toxic colloidal silica-based solution for sand dunes has been verified first time by means laboratory experiments. An extensive experimental campaign aimed at studying effectiveness use nanosilica cond...