Results 71 to 80 of about 590 (205)

Machine Learning and Satellite Time-Series Reveal Climate-Driven Variability in Dune Migration in the Western Sahara

IEEE Journal of Selected Topics in Applied Earth Observations and Remote Sensing
This study demonstrates the potential of advanced machine learning techniques, combined with Google Earth Engine and JavaScript, for detecting and analyzing barchan dunes from satellite imagery.
Patryk Sapiega
doaj   +1 more source

Barchan Slipface Grainflows: Characteristics and Kinematics

Geophysical Research Letters, 2022
Gravity‐driven grainflows on aeolian dunes are important agents of sand transport on Earth and Mars but have been the focus of few field studies. We present results from the first comprehensive field study to evaluate hypotheses posed by previous studies:
Douglas J. Sherman, Pei Zhang, Jon Pelletier, Jean Ellis, Eugene Farrell, Bailiang Li   +5 more
doaj   +1 more source

Protracted intercontinental aridification preserved within the early Late Cretaceous strata of the Eastern Gobi Basin, Mongolia

Sedimentology, Volume 73, Issue 1, Page 147-185, January 2026.
ABSTRACT Mongolia's Eastern and Western Gobi Basins preserve a globally significant record of Cretaceous terrestrial vertebrates, yet their biostratigraphic correlations are complicated by a complex geological history. The Eastern Gobi Basin, a northeast‐southwest trending fault‐bounded rift system, includes several minor sub‐basins with distinct ...
Ryan T. Tucker, Michael Ryan King, Puntsag Delgerzaya, William J. Freimuth, Tsogtbaatar Chinzorig, Khishigjav Tsogtbaatar, Ryuji Takasaki, Mototaka Saneyoshi, Alfio Alessandro Chiarenza, Lindsay E. Zanno   +9 more
wiley   +1 more source

On the genesis and evolution of barchan dunes: morphodynamics

, 2017
Barchan dunes are crescent-shaped formations of sand that can dominate both desert and subaqueous landscapes when the supply of sand is scarce. Because of the complexity and scale of the underlying phenomena, the mechanisms governing the entire process ...
F. Sotiropoulos, A. Khosronejad
core   +1 more source

Barchan‐Barchan Dune Repulsion Investigated at the Grain Scale

Journal of Geophysical Research: Earth Surface
AbstractBarchans are eolian dunes of crescent shape found on Earth, Mars and other celestial bodies. Among the different types of barchan‐barchan interaction, there is one, known as chasing, in which the dunes remain close but without touching each other.
N. C. Lima, W. R. Assis, C. A. Alvarez, E. M. Franklin   +3 more
openaire   +2 more sources

Transient Hydrology in Amazonis Planitia (Mars) in the Aftermath of the Tooting Impact

Journal of Geophysical Research: Planets, Volume 130, Issue 11, November 2025.
Abstract Hydrological flows generated by meteoroid impact are still largely unexplored on Mars and may also have implications for Earth. We reconstructed the hydrological sequence initiated on Mars by a less than 3 Ma old meteoroid impact that formed the 28 km‐wide Tooting crater on Amazonis Planitia, an ice‐bearing region.
Fabio Vittorio De Blasio, Andrea Caccia, Giovanni Battista Crosta   +2 more
wiley   +1 more source

Groundwater Altered Water Balance and Plant Water Use Efficiency in Desert Ecosystems

Water Resources Research, Volume 61, Issue 11, November 2025.
Abstract Groundwater is an important water source in water‐limited desert ecosystem. Less attention has been paid to how the water balance and plant performance in such ecosystems vary with the presence or absence of groundwater. Appropriate replanting strategies play a pivotal role in preventing desertification.
Yicong Nan, Jianqiang Huo, Gaoling Han, Rui Hu, Yang Zhao, Yafeng Zhang, Xiao Lu, Yuanzhen Zhou, Jannis Groh, Zhishan Zhang   +9 more
wiley   +1 more source

Morphology of Barchan Dunes on Earth and Mars:Classification and Scale-Invariance [PDF]

Morphological characteristics were measured for barchan dunes on Earth (2,686 dunes in 30 barchan fields) and Mars (720 dunes in 10 barchan fields) using satellite images. The data were used to (a) develop a new barchan classification system; (b) compare
Bae, Jinsu, Sherman, Douglas J., Baas, Andreas C.W.; id_orcid, Butler, Robert J., Zhang, Pei   +4 more
core   +1 more source

Quantifying the Form‐Flow‐Saltation Dynamics of Aeolian Sand Ripples

Journal of Geophysical Research: Earth Surface, Volume 130, Issue 10, October 2025.
Abstract Ripples are the most fundamental and ubiquitous aeolian bedforms formed on sandy surfaces, but their small size and fast response times make them inherently difficult to measure. However, these attributes also make ripples excellent flow indicators, and they have been used extensively in planetary locations for this purpose.
Joanna M. Nield, Matthew C. Baddock, Giles F. S. Wiggs, Jim Best, Kenneth T. Christensen, Pauline Delorme, Andrew Valdez, Nathaniel R. Bristow, Martin H. T. Hipondoka, Daniel P. Goss, Natasha S. Wallum, Philippe Claudin   +11 more
wiley   +1 more source

Bubble Printing of Anisotropic Clay Nanotubes

Advanced Optical Materials, Volume 13, Issue 25, September 3, 2025.
Bubble printing patterns of lyotropic liquid crystal nanotubes form toroidal or linear patterns depending on laser movement and colloidal stability. Long nanotubes create radial filament bundles, while poor electrostatic repulsion hinders deposition.
Claire Hotton, Erwan Paineau, Eric H. Hill   +2 more
wiley   +1 more source