Results 91 to 100 of about 590 (205)

Surface Dust Coverages on Rock Targets in Gale Crater: Influence of Elevation, Proximity to Aeolian Sand Fields and Seasonality

Journal of Geophysical Research: Planets, Volume 130, Issue 7, July 2025.
Abstract Martian dust is mobilized throughout the year by local, regional, and global dust storms, influencing atmospheric opacity and inhibiting observations of the surface. Using Mars Hand Lens Imager (MAHLI) images and methods of Schmidt et al. (2018), https://doi.org/10.1029/2018je005553, areal dust coverages on 368 near‐horizontal, undisturbed ...
T. L. J. Henley, M. E. Schmidt, K. W. Lewis, J. E. Moores, C. Hayes, S. L. Bray, N. J. Bradley, R. E. Lee, I. K. Marincic, K. W. Turner, S. D. Guzewich, C. E. Newman, G. Bischof, D. Viúdez‐Moreiras   +13 more
wiley   +1 more source

Scour Pits in the Medusae Fossae Formation and Olympus Mons Region on Mars

Journal of Geophysical Research: Planets, Volume 130, Issue 7, July 2025.
Abstract The Medusae Fossae Formation (MFF) covers a region of Mars located to the southwest of the Olympus Mons shield volcano. The nature of this formation has been under debate for over 30 years. In order to better understand the MFF, we investigated scour pits or V‐shaped depressions carved into many places across the MFF.
Santa L. Pérez‐Cortés, Ali M. Bramson, Christina M. Sowinski, Mackenzie Day   +3 more
wiley   +1 more source

barchan dunes on Popham Beach

, 2013
barchan dunes on Popham BeachKelley NGGDPP Grant 2019https://digitalmaine.com/mgs_geologic_field_photos/12945/thumbnail ...
Kelley, Joseph
core  

Multidirectional Dune Dynamics Under Seasonal Winds on Mars

Geophysical Research Letters, Volume 52, Issue 12, 28 June 2025.
Abstract We present a systematic assessment of the complex aeolian bedforms across the western rim of Hellas Planitia, the largest impact basin on Mars. Repeat orbital imaging shows crescentic, transverse, and star dunes across the Hellespontus Montes region migrate, converge, and occasionally reverse course.
Matthew Chojnacki, David A. Vaz, Pruthviraj J. Acharya, Simone Silvestro, Isaac B. Smith   +4 more
wiley   +1 more source

Distribution and constructed morphology of artificial foredune notches

Earth Surface Processes and Landforms, Volume 50, Issue 7, 15 June 2025.
This study has identified constructed foredune notches and using aerial images created a classification system based on morphometric measurements of 133 notches in four countries. Six classifications are proposed: A—Minor notch, B—rectangular notch, C—slot and lobe, D—trapezoidal notch, E—elongated notch, and F—composite notch.
Thomas Pagon, Thomas Smyth, Ryan Wilson, Bethany Fox   +3 more
wiley   +1 more source

barchan dunes Popham Beach from air

, 1983
barchan dunes Popham Beach from airKelley NGGDPP Grant 2019https://digitalmaine.com/mgs_geologic_field_photos/12941/thumbnail ...
Kelley, Joseph
core  

ON THE LINES OF RESEARCH OF ORIGIN OF THE SARYKUM BARCHAN DUNES

Юг России: экология, развитие, 2017
Aim. The main aim of the research is to show the groundlessness of critical remarks and their bias, shortcomings and misconceptions in the study of Sarikum, ways to address the origin of the Sarykum dunes.Methods.
V. U. Matsapulin, E. V. Tulysheva, M. V. Khlopkova   +2 more
doaj   +1 more source

Barchans Interacting With Dune‐Size Obstacles: Details of the Fluid Flow and Motion of Grains

Journal of Geophysical Research: Earth Surface, Volume 130, Issue 6, June 2025.
Abstract We investigate details of the interaction of subaqueous barchans with dune‐size obstacles by carrying out numerical simulations where the fluid is solved at the grain scale and the motions of individual grains are computed at all time steps. With the outputs, we analyze the disturbances of the fluid flow, the trajectories of grains, and the ...
N. C. Lima, W. R. Assis, D. S. Borges, E. M. Franklin   +3 more
wiley   +1 more source

The flow structure of interacting barchan dunes

, 2010
High-resolution particle-image velocimetry (PIV) experiments have been conducted over a fixed-bed to examine the effects of interacting barchan dunes on the flow structure.
Palmer, Jessica A.
core  

Statistical comparisons of grain size characteristics, hydraulic conductivity, and porosity of barchan desert dunes to coastal dunes

, 2019
Ancient dune sand environments in deserts and coasts are aquifers and hydrocarbon reservoirs that commonly have preserved high permeability (hydraulic conductivity).
Lopez Valencia, Oliver Miguel, Hegy, Michael C., Missimer, Thomas M.   +2 more
core   +1 more source