Wind Tunnel Studies Of Ripple Formation
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Wind Tunnel Studies Of Ripple Formation
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Author : Matti Seppälä
language : en
Publisher:
Release Date : 1978
Wind Tunnel Studies Of Ripple Formation written by Matti Seppälä and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1978 with Ripple-marks categories.
Wind Tunnel Studies Of Aeolian Saltation Threshold And Dust Storm Triggering Mechanisms With The Use Of High Speed Video And Specialized Boundary Layer Wind Tunnels At Atmospheric And Martian Mean Surface Pressures
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Author : James Phoreman
language : en
Publisher:
Release Date : 2002
Wind Tunnel Studies Of Aeolian Saltation Threshold And Dust Storm Triggering Mechanisms With The Use Of High Speed Video And Specialized Boundary Layer Wind Tunnels At Atmospheric And Martian Mean Surface Pressures written by James Phoreman and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2002 with categories.
Formation And Organization Of Aeolian Bedforms
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Author : Daniel Shane Valentine
language : en
Publisher:
Release Date : 2004
Formation And Organization Of Aeolian Bedforms written by Daniel Shane Valentine and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2004 with categories.
Aeolian bedforms represent some of the most intricate land forms on the planet encompassing a variety of scales from wind ripples on the order of centimeters to desert sand seas comprising thousands of square kilometers. Hypotheses focusing on the formation and organization of these bedforms have been nearly as complex and varied as the dunes themselves. Three distinct topics were chosen for the focus of this study: (1) the formation and organization of wind ripples; (2) morphology and sampling effects from measurement of dune lee side airflow; and (3) the formation of star dunes based on wind tunnel studies of small scale star ripples. Each of these topics comprises a chapter of this thesis, which will be published individually at a later date. Wind ripple formation has been a topic of discussion for nearly a century. For this study ripples were formed in a wind tunnel and recorded using time-lapse photography. Data reveal that ripples form in a pattern that closely matches the formation of computer simulated bedforms using only basic rules of sand transport, but neglecting any sort of aerodynamic control of bedform morphology. These findings support the hypothesis that aeolian bedforms are self-organizing and that no predisposed template of formation exists within the fluid flow. Aeolian dune lee side airflow comprises a complex subject of study. The airflow is the result of a complex interaction between the wind and the sand surface. Using a new technique of wind velocity data collection, a more accurate picture of the lee side airflow morphology is now available. This data set provides the most comprehensive look at this environment to date. Of particular interest are the data outlining the Internal Boundary Layer, which is closest to the sediment surface and controls sediment transport. The data collected imply that no point of dune nucleation, caused by a drop in shear velocity, exists in the interdune corridor, rather, the shear increases downwind until another dune is reached. Conclusions based on the data support the theory of self organization when applied to desert dunes. Star dunes are the largest and most complex single bedforms found on Earth. Due to their size and long development time, observations of star dune formation are scant. Using a rotating table mounted in a wind tunnel, a series of complex wind patterns were simulated. Small scale star ripples were formed and the process recorded using time-lapse photography. Based on these findings at least two distinct types of star dunes are possible in nature. Because of the relationship between the wind regime and the bedforms produced, a causal link between aerodynamic control and bedform formation is dubious. More likely, however, is the self organization theory which has proven useful in all scales of bedforms examined in this study
Wind As A Geological Process
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Author : Ronald Greeley
language : en
Publisher: CUP Archive
Release Date : 1987-08-28
Wind As A Geological Process written by Ronald Greeley and has been published by CUP Archive this book supported file pdf, txt, epub, kindle and other format this book has been release on 1987-08-28 with Nature categories.
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.
Eolian Sediments And Processes
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Author : M.E. Brookfield
language : en
Publisher: Elsevier
Release Date : 2000-04-01
Eolian Sediments And Processes written by M.E. Brookfield and has been published by Elsevier this book supported file pdf, txt, epub, kindle and other format this book has been release on 2000-04-01 with Science categories.
Papers cover the entire spectrum of eolian investigations, ranging from the microscopic level to regional synthesis as well as ancient eolian deposits and their interpretation.
Wind Tunnels And Experimental Fluid Dynamics Research
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Author : Jorge Colman Lerner
language : en
Publisher: BoD – Books on Demand
Release Date : 2011-07-27
Wind Tunnels And Experimental Fluid Dynamics Research written by Jorge Colman Lerner and has been published by BoD – Books on Demand this book supported file pdf, txt, epub, kindle and other format this book has been release on 2011-07-27 with Science categories.
The book "Wind Tunnels and Experimental Fluid Dynamics Research" is comprised of 33 chapters divided in five sections. The first 12 chapters discuss wind tunnel facilities and experiments in incompressible flow, while the next seven chapters deal with building dynamics, flow control and fluid mechanics. Third section of the book is dedicated to chapters discussing aerodynamic field measurements and real full scale analysis (chapters 20-22). Chapters in the last two sections deal with turbulent structure analysis (chapters 23-25) and wind tunnels in compressible flow (chapters 26-33). Contributions from a large number of international experts make this publication a highly valuable resource in wind tunnels and fluid dynamics field of research.
Atlas Of Sand Grain Surface Textures And Applications
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Author : W. C. Mahaney
language : en
Publisher: Oxford University Press, USA
Release Date : 2002
Atlas Of Sand Grain Surface Textures And Applications written by W. C. Mahaney and has been published by Oxford University Press, USA this book supported file pdf, txt, epub, kindle and other format this book has been release on 2002 with Nature categories.
Mahaney presents methods of using electron microscopy developed in the past 25 years, and discusses their values in the interpretation of sedimentary environments, the problems inherent in these methods, case studies and future possibilities for research.
Climatic Geomorphology
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Author : M. Gutierrez Elorza
language : en
Publisher: Elsevier
Release Date : 2005-12-29
Climatic Geomorphology written by M. Gutierrez Elorza and has been published by Elsevier this book supported file pdf, txt, epub, kindle and other format this book has been release on 2005-12-29 with Science categories.
During the past few decades climatic geomorphology has been substantially enlarged in knowledge, thanks to numerous detailed investigations, the application of a large number of techniques, and the acquisition of abundant absolute dates. The challenge of predicting the effects of the prophesied future global warming on morphogenetic processes and landforms has encouraged geomorphologists to study the Late Pleistocene and Holocene climatic changes from the geomorphological and geological record. The advances achieved in the field of climatic geomorphology during the past years are reflected by the publication of several specific monographs about the different morphoclimatic zones. The aim of this book is to provide an up-to-date general view of this branch of geomorphology. It includes a chapter on applied geomorphology for each morphoclimatic zone providing an approximation of the main environmental problems. Geoscientists, geomorphologists
Dune Worlds
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Author : Ralph D. Lorenz
language : en
Publisher: Springer Science & Business Media
Release Date : 2014-04-22
Dune Worlds written by Ralph D. Lorenz and has been published by Springer Science & Business Media this book supported file pdf, txt, epub, kindle and other format this book has been release on 2014-04-22 with Science categories.
This book describes how sand dunes work, why they are the way they are in different settings, and how they are being studied. Particular attention is paid to their formation and appearance elsewhere in the solar system. New developments in knowledge about dunes make for an interesting story – like the dunes themselves, dune science is dynamic – and the visual appeal of Aeolian geomorphology ensures that this is an attractive volume. The book is divided into 4 parts, the first of which introduces dunes as a planetary phenomenon, showing a landscape reflecting the balance of geological processes – volcanism, impact, tectonics, erosion, deposition of sediments. Dunes are then considered as emergent dynamical systems: the interaction of sand and wind conspires to generate very characteristic and reproducible shapes. Analogies are given with other emergent structures such as patterned ground before the influence of dunes on desert peoples and infrastructure is studied, together with their use as forensic climatological indicators. Dune Physics is looked at with regard to the mechanics of sand, the physics of wind, saltation – interaction of sand and air – dunes versus ripples and transverse Aeolian ridges, the classification of dune morphology and the sources and sinks of sand. Dune Trafficability considers soil mechanics, effects on mobility on Earth, Mars and elsewhere. In the second part, Earth, Mars, Titan and other moons and planets are examined, beginning with a survey of the major deserts and dunefields on Earth. The authors then turn to Mars and its environment, sediment type, dune stratigraphy, sediment source and sinks and the association of dunes with topographic features. Titan follows - its thick, cold atmosphere, methane dampness, low gravity, morphology – interaction with topography and the implications of dunes for climate and winds. Dunes elsewhere conclude this part. There are few dunefields on Venus, but there is a .possibility of Aeolian transport on Triton and volcanic-related windstreaks on Io.
Wind As A Geomorphic Agent In Cold Climates
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Author : Matti Seppälä
language : en
Publisher: Cambridge University Press
Release Date : 2004-06-17
Wind As A Geomorphic Agent In Cold Climates written by Matti Seppälä and has been published by Cambridge University Press this book supported file pdf, txt, epub, kindle and other format this book has been release on 2004-06-17 with Science categories.
A 2004 monograph describing wind-generated polar landforms, both modern-day and those preserved in the geological record.
