Download or read book Pattern Analysis of Aeolian Dune Crests in White Sands New Mexico written by Joe Kendall Salinas and published by . This book was released on 2015 with total page 56 pages. Available in PDF, EPUB and Kindle. Book excerpt: Aeolian dune fields are among the most significant examples of patterns seen in nature. Laterally linked barchanoid dunes create a crescentic region within the White Sands Dune Field in New Mexico. Physical mapping of the dunes within the crescentic region using Google Earth allowed for naturally occurring patterns and downwind trends in Aeolian systems to be identified. The patterns have been interpreted as the outcome of self-organizing phenomena that arise within the complex system of sediment transport. The dimensions (arc length and width) of the mapped dune crest segments consistently decrease in the downwind direction across White Sands. However, the sinuosity of the dune crest segments (the curvature of the laterally linked bedforms) is consistent across White Sand Dune Field. Lastly the numbers of mapped segments within a dune crest were recorded in the downwind direction. This information regarding the change in the quantity of segments downwind shows that as dune crest lengths increase in size, the number of dune segments within a dune crest increase downwind. These measured parameters allow for a better understanding of the morphology of crescentic dunes as they exchange sediment and migrate downwind. The data is also complementary to previous pattern analyses conducted in White Sands.
Download or read book Patterns and Paleoshorelines of White Sands Dune Field New Mexico written by Elke Elise Baitis and published by . This book was released on 2011 with total page 104 pages. Available in PDF, EPUB and Kindle. Book excerpt: The dune field at White Sands, New Mexico, shows a well-defined pattern of dunes and interdune areas, as well as spatial variations in this pattern. The purpose of this research is to determine which measured pattern parameters are most consistent across the dune field and to determine the cause of depositional spatial variability. This was accomplished using an airborne LiDAR generated digital-elevation model (DEM) collected in June 2007 and covering 39 km2 of the dune field. Properties of the dune field are defined by measurements from three dune populations: 1) 110 randomly selected dunes, 2) 247 dunes along transects oriented in the net transport direction, and 3) 171 dunes from three zones within the field where differences in pattern are visible. Measurements of eight common dune parameters show that the lowest coefficients of variation occur with dune orientation and crestline sinuosity, which largely define the field pattern. Cross-plotting of parameters shows generally poor correlations, which is thought to reflect variation around field-scale means that are comparable to other dune fields globally. Removing the dunes from the LiDAR DEM reveals a depositional substrate with breaks in slope interpreted as three paleoshorelines associated with Pleistocene Lake Otero. The paleoshorelines are antecedent boundary conditions that exert the primary control on spatial variability within the dune pattern.
Download or read book Pattern Formation and Preservation in Aeolian Systems written by Mackenzie Denali Day and published by . This book was released on 2017 with total page 370 pages. Available in PDF, EPUB and Kindle. Book excerpt: Aeolian sediment transport forms natural patterns common on Earth and other planetary bodies. The self-organization of sand in transport results in dune fields with dune morphologies determined by wind regime. Patterning in dune fields is known to arise from the autogenic process of dune interactions, but the evolution of dune patterns over time remains poorly constrained. In this work dune fields were parameterized in terms of dune interactions to quantify dune-field pattern stability. Interactions are fundamental to dune-field development, but studies of interactions have focused on their surface expression, and how interactions are expressed in the ancient record has yet to be documented. This problem is addressed with five examples of interaction-generated stratigraphy identified in well-known Jurassic aeolian sandstones using criteria based on recent near-surface interpretations of interaction stratigraphy form White Sands Dune Field, New Mexico. Interactions control the autogenic development of dune fields, but allogenic factors including basin subsidence, water table rise, and sediment supply largely control the accumulation and preservation of aeolian strata. In a case study of a section of the Jurassic Entrada Sandstone, this work addresses the interplay between allogenic and autogenic controls on what is actually preserved in the rock record, and demonstrates how long stretches of time can be collapsed into surfaces between geologic units that represent relatively short-lived events. The competition between allogenic and autogenic influences on aeolian pattern formation is not unique to Earth, and Mars also hosts patterned landscapes thought to be generated by aeolian sediment transport. Such landscapes include intra-crater layered mounds such as Aeolis Mons in Gale crater, the landing site of the Mars Science Laboratory rover. Competing hypotheses about whether these mounds formed by aeolian erosion of crater-filling deposits, or by aeolian deposition were addressed with wind tunnel and large eddy simulation experiments. The results are compatible with an erosional origin of the mounds. Additional analyses of wind-formed landscapes within and around Gale crater further supported the wind-erosion hypothesis of the central mound.
Download or read book Dune Pattern Dynamics on a Multi decadal Scale at the White Sands Dune Field New Mexico written by David Rachal and published by . This book was released on 2007 with total page 178 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Dune Behavior in a Multidirectional Wind Regime written by Anine Oehlenschlaeger Pedersen and published by . This book was released on 2014 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: As with most dune fields, the White Sands Dune Field in New Mexico forms in a wind regime that is not unimodal. In this study, dune behavior at White Sands was documented from a time series of five lidar-derived digital elevation models (DEM) and compared to a record of wind direction and speed during the same period. For the study period of June 2007 - June 2010, 244 sand-transporting wind events occurred and define a dominant wind mode from the SW and lesser modes from the NNW and SSE. Based upon difference maps and tracing of dune brinklines, overall dune behavior consists of migration to the NE, but with along-crest migration of dune sinuosity to the SE. Permutations of the DEMs allow matching specific dune behavior with wind modes. The SW winds are transverse to dune orientations and cause most forward migration. The NNW winds cause along-crest migration of dune sinuosity and low stoss bedforms, as well as SE migration of NE-trending dune terminations. The SSE winds cause ephemeral dune deformation, especially crestal slipface reversals. Dune deformation occurs because of unequal deposition along the lee face as a function of the incidence angle formed between the wind and the local brinkline orientation. Incidence-angle control on dune deformation and types of lee-face surface processes allows for an idealized model for White Sands dunes. The dunes behave as complex systems in which each wind event deforms the dune shape, this new shape then serves as the configuration for the next wind event.
Download or read book Arid and Semi Arid Geomorphology written by Andrew S. Goudie and published by Cambridge University Press. This book was released on 2013-05-27 with total page 467 pages. Available in PDF, EPUB and Kindle. Book excerpt: Based on four decades of research by Professor Andrew Goudie, this volume provides a state-of-the-art synthesis of our understanding of desert geomorphology. It presents a truly international perspective, with examples from all over the world. Extensively referenced and illustrated, it covers such topics as the importance of past climatic changes, the variability of different desert environments, rock breakdown, wind erosion and dust storm generation, sand dunes, fluvial and slope forms and processes, the role of the applied geomorphologist in desert development and conservation, and the Earth as an analogue for other planetary bodies. This book is destined to become the classic volume on arid and semi-arid geomorphology for advanced students and researchers in physical geography, geomorphology, Earth science, sedimentology, environmental science and archaeology.
Download or read book Plants Animals of White Sands written by and published by . This book was released on 1989 with total page 32 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Wind as a Geological Process written by Ronald Greeley and published by CUP Archive. This book was released on 1987-08-28 with total page 356 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book gives an account of geological aspects of windblown material. Aeolian processes play an important role in modifying the surface of the Earth, and they are also active on Mars. Additionally, they are thought to occur on Venus and possibly Titan as well. The authors describe the following aspects: wind as a geological process, the aeolian environment, physics of particle motion, aeolian abrasion and erosion; aeolian sand deposits and bedforms, interaction of wind and topography and windblown dust. A particular strength of the book is that it deals with aeolian processes in a planetary context, rather than as a purely terrestrial phenomenon. In so doing, the authors ably demonstrate how we can gain better understanding of the Earth through comparative planetology. This paperback reissue will enable the book to be used as a text for advanced students in planetary science. Special terms are defined when they are first used. There is a glossary and an exhaustive bibliography.
Download or read book Dune Front Movement Trends at White Sands New Mexico written by Matthew M. Laick and published by . This book was released on 2001 with total page 124 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Aeolian Dune Dynamics and the Stratigraphic Record written by Sarah Christian Brothers and published by . This book was released on 2016 with total page 478 pages. Available in PDF, EPUB and Kindle. Book excerpt: Dunes and dune fields are dynamic features that respond to the unique boundary conditions under which they evolve by changing migration habits, types and frequencies of interactions, and morphologies. As such, dunes convey information about changing atmospheric and surface conditions on planetary bodies including Earth, Mars, Venus, and Titan, and the stratigraphic record left by these bedforms is used to interpret the evolution of paleoclimate and surface environments. In four parts this work examines how the dynamics of individual dunes, dune fields, and aeolian systems influence stratigraphic architectures across multiple spatial scales. At White Sands Dune Field, New Mexico, the decadal histories of defect and bedform repulsion-type interactions are traced through a time-series of images. The resultant stratigraphic architectures are derived from plan-view exposures and ground penetrating radar sensing of dune interiors. This is the first documentation of the unique stratigraphic architectures that result from interactions between dunes. Within Chasma Boreale, Planum Boreum, Mars, boundary conditions controlling the discrete geomorphic expressions of the Hyperboreae Undae dune fields are evaluated using morphologic distributions. The distributions reveal that dune field expressions change over short horizontal scales and are dependent upon wind regime and sediment state, which operate under the background condition of dune induration by ice. Hyperboreae Undae form only part of the Chasma Boreale sediment system, however. Perennial layered ice deposits also are present on the floor of the reentrant. The changing balance of ice- and sand-dominated processes in space and time have resulted in an accumulation that transitions between ancient aeolian cavi unit-style accumulation and modern layered ice deposit-style accumulation. These accumulations can be interpreted through aeolian sequence stratigraphy. Findings from the Chasma Boreale transitional sediment system are applied to nearby outcrops of a transitional section of ancient cavi unit, which formed in an environment analogous to the modern Chasma Boreale sediment system. A sequence interpretation of the transitional cavi unit stratigraphic succession demonstrates how the aeolian system transitioned into overlying water ice deposits without a gap in the geologic record, verifying that the cavi unit and NPLD should be unified under a sequence stratigraphic framework.
Download or read book Structures of Dunes at White Sands National Monument New Mexico and a Comparison with Structures of Dunes from Other Selected Areas written by Edwin D.. Mc Kee and published by . This book was released on 1966 with total page 69 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Structures of dunes at White Sands National Monumen4 New Mexico written by Edwin Dinwiddie McKee and published by . This book was released on 1966 with total page 69 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Journal of Sedimentary Petrology written by and published by . This book was released on 1988 with total page 590 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Geomorphology of Desert Environments written by Anthony J. Parsons and published by Springer Science & Business Media. This book was released on 2009-03-20 with total page 824 pages. Available in PDF, EPUB and Kindle. Book excerpt: About one-third of the Earth’s land surface experiences a desert climate, and this area supports approximately 15% of the planet’s population. This percentage continues to grow, and with this growth comes the need to acquire and apply an understanding of desert geomorphology. Such an understanding is vital in managing scarce and fragile resources and in mitigating natural hazards. This authoritative reference book is comprehensive in its coverage of the geomorphology of desert environments, and is arranged thematically. It begins with an overview of global deserts, proceeds through treatments of weathering, hillslopes, rivers, piedmonts, lake basins, and aeolian surfaces, and concludes with a discussion of the role of climatic change. Written by a team of international authors, all of whom are active in the field, the chapters cover the spectrum of desert geomorphology.
Download or read book A Sedimentary Study of Dune Sands Lamb and Bailey Counties Texas and White Sands National Monument New Mexico written by Billy Ray Jones and published by . This book was released on 1959 with total page 190 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Plants and Animals of White Sands written by National Park Service and published by Forgotten Books. This book was released on 2017-10-29 with total page 34 pages. Available in PDF, EPUB and Kindle. Book excerpt: Excerpt from Plants and Animals of White Sands: A Discussion of Dunes Ecology With Revised Checklists; White Sands National Monument, New Mexico The white Sands is a sea of graceful white gypsum dunes a landscape of stark natural beauty. The absence of plant life in the interior of the dune field is indicative of the harsh physical conditions that prevail. There, only a few grasses and small shrubs, along with small rodent and reptile life, are able to survive for a time between the endlessly migrating dunes. About the Publisher Forgotten Books publishes hundreds of thousands of rare and classic books. Find more at www.forgottenbooks.com This book is a reproduction of an important historical work. Forgotten Books uses state-of-the-art technology to digitally reconstruct the work, preserving the original format whilst repairing imperfections present in the aged copy. In rare cases, an imperfection in the original, such as a blemish or missing page, may be replicated in our edition. We do, however, repair the vast majority of imperfections successfully; any imperfections that remain are intentionally left to preserve the state of such historical works.
Download or read book Stratigraphic Analyses Using GPR written by Gregory S. Baker and published by Geological Society of America. This book was released on 2007-01-01 with total page 192 pages. Available in PDF, EPUB and Kindle. Book excerpt:
