Interpretation of the complex dune morphology on Mars: dune activity, modelling and a terrestrial analogue

2012 ◽  
Vol 37 (13) ◽  
pp. 1424-1436 ◽  
Author(s):  
S. Silvestro ◽  
L. K. Fenton ◽  
T. I. Michaels ◽  
A. Valdez ◽  
G. G. Ori
Keyword(s):  
Dune Morphology ◽  
Dune Activity

scholarly journals Orbital observations of contemporary dune activity in Endeavor crater, Meridiani Planum, Mars

2011 ◽  
Vol 116 ◽  
Author(s):  
Matthew Chojnacki ◽  
Devon M. Burr ◽  
Jeffrey E. Moersch ◽  
Timothy I. Michaels
Keyword(s):  
Meridiani Planum ◽  
Dune Activity

scholarly journals Quantifying hydraulic roughness from field data: can dune morphology tell the whole story?

2021 ◽  
Author(s):  
Sjoukje Irene de Lange ◽  
A.J.F. (Ton) Hoitink ◽  
Suleyman Naqshband
Keyword(s):  
Field Data ◽  
Hydraulic Roughness ◽  
Dune Morphology

scholarly journals Directional dependency and coastal framework geology: implications for barrier island resilience

2018 ◽  
Vol 6 (4) ◽  
pp. 1139-1153 ◽  
Author(s):  
Phillipe A. Wernette ◽  
Chris Houser ◽  
Bradley A. Weymer ◽  
Mark E. Everett ◽  
Michael P. Bishop ◽  
...  
Keyword(s):  
Coastal Management ◽  
Spatial Scales ◽  
Moving Average ◽  
Barrier Island ◽  
Arfima Models ◽  
Societal Pressure ◽  
Dune Morphology ◽  
Padre Island ◽  
National Seashore

Abstract. Barrier island transgression is influenced by the alongshore variation in beach and dune morphology, which determines the amount of sediment moved landward through wash-over. While several studies have demonstrated how variations in dune morphology affect island response to storms, the reasons for that variation and the implications for island management remain unclear. This paper builds on previous research by demonstrating that paleo-channels in the irregular framework geology can have a directional influence on alongshore beach and dune morphology. The influence of relict paleo-channels on beach and dune morphology on Padre Island National Seashore, Texas, was quantified by isolating the long-range dependence (LRD) parameter in autoregressive fractionally integrated moving average (ARFIMA) models, originally developed for stock market economic forecasting. ARFIMA models were fit across ∼250 unique spatial scales and a moving window approach was used to examine how LRD varied with computational scale and location along the island. The resulting LRD matrices were plotted by latitude to place the results in the context of previously identified variations in the framework geology. Results indicate that the LRD is not constant alongshore for all surface morphometrics. Many flares in the LRD plots correlate to relict infilled paleo-channels, indicating that the framework geology has a significant influence on the morphology of Padre Island National Seashore (PAIS). Barrier island surface morphology LRD is strongest at large paleo-channels and decreases to the north. The spatial patterns in LRD surface morphometrics and framework geology variations demonstrate that the influence of paleo-channels can be asymmetric (i.e., affecting beach–dune morphology preferentially in one direction alongshore) where the alongshore sediment transport gradient was unidirectional during island development. The asymmetric influence of framework geology on coastal morphology has long-term implications for coastal management activities because it dictates the long-term behavior of a barrier island. Coastal management projects should first seek to assess the framework geology and understand how it influences coastal processes in order to more effectively balance long-term natural variability with short-term societal pressure.

Holocene dune activity and environmental change in the prairie parki and and boreal forest, central Saskatchewan, Canada

The Holocene ◽  
2006 ◽  
Vol 16 (1) ◽  
pp. 17-29 ◽  
Author(s):  
Stephen A. Wolfe ◽  
Jeff Ollerhead ◽  
David J. Huntley ◽  
Olav B. Lian
Keyword(s):  
Environmental Change ◽  
Boreal Forest ◽  
Great Plains ◽  
Late Holocene ◽  
Early Holocene ◽  
Aeolian Activity ◽  
Landscape Response ◽  
Response To Environmental Change ◽  
Holocene Activity ◽  
Dune Activity

Past aeolian activity was reconstructed at four dunefields in the prairie parkland and boreal forest of central Saskatchewan to elucidate landscape response to environmental change. Optical ages from stabilized dunes in the boreal transition ecoregion indicate two episodes of activity. The first, at about 11 ka, corresponds to a period of early-Holocene parkland and grassland cover following deglaciation and drainage after about 13.0 ka, and brief establishment of boreal forest. The second, between about 7.5 and 5 ka, corresponds to a period of mid-Holocene parkland-grassland cover. Optical ages from dunefields in the prairie parkland primarily record mid-Holocene activity, between about 7.5 and 4.7 ka, corresponding to a period of grassland cover, with some reworking continuing into the late Holocene. Although this area was deglaciated by about 13.5 ka, there is no evidence of early-Holocene dune activity, suggesting that mid-Holocene activity may have reworked earlier deposits here. Consequently, much of the morphology and stratigraphy observed in these dunefields are associated with mid-Holocene activity, likely associated with increased aridity and reduced vegetation cover at that time. This study provides the most northerly evidence of mid-Holocene dune reactivation on the Great Plains, lending support to the assertion that aeolian activity was widespread at that time.

Sign in / Sign up

Export Citation Format

Share Document