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Author: National Research Council
Publisher: National Academies Press
ISBN: 0309185491
Category : Science
Languages : en
Pages : 182
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Book Description
Alluvial fans are gently sloping, fan-shaped landforms common at the base of mountain ranges in arid and semiarid regions such as the American West. Floods on alluvial fans, although characterized by relatively shallow depths, strike with little if any warning, can travel at extremely high velocities, and can carry a tremendous amount of sediment and debris. Such flooding presents unique problems to federal and state planners in terms of quantifying flood hazards, predicting the magnitude at which those hazards can be expected at a particular location, and devising reliable mitigation strategies. Alluvial Fan Flooding attempts to improve our capability to determine whether areas are subject to alluvial fan flooding and provides a practical perspective on how to make such a determination. The book presents criteria for determining whether an area is subject to flooding and provides examples of applying the definition and criteria to real situations in Arizona, California, New Mexico, Utah, and elsewhere. The volume also contains recommendations for the Federal Emergency Management Agency, which is primarily responsible for floodplain mapping, and for state and local decisionmakers involved in flood hazard reduction.
Author: National Research Council
Publisher: National Academies Press
ISBN: 0309185491
Category : Science
Languages : en
Pages : 182
Get Book Here
Book Description
Alluvial fans are gently sloping, fan-shaped landforms common at the base of mountain ranges in arid and semiarid regions such as the American West. Floods on alluvial fans, although characterized by relatively shallow depths, strike with little if any warning, can travel at extremely high velocities, and can carry a tremendous amount of sediment and debris. Such flooding presents unique problems to federal and state planners in terms of quantifying flood hazards, predicting the magnitude at which those hazards can be expected at a particular location, and devising reliable mitigation strategies. Alluvial Fan Flooding attempts to improve our capability to determine whether areas are subject to alluvial fan flooding and provides a practical perspective on how to make such a determination. The book presents criteria for determining whether an area is subject to flooding and provides examples of applying the definition and criteria to real situations in Arizona, California, New Mexico, Utah, and elsewhere. The volume also contains recommendations for the Federal Emergency Management Agency, which is primarily responsible for floodplain mapping, and for state and local decisionmakers involved in flood hazard reduction.
Author: D. Ventra
Publisher: Geological Society of London
ISBN: 1786202670
Category : Science
Languages : en
Pages : 351
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Book Description
Alluvial and fluvial fans are the most widespread depositional landform bordering the margins of highland regions and actively subsiding continental basins, across a broad spectrum of tectonic and climatic settings. They are significant to the local morphodynamics of mountain regions and also to the evolution of sediment-routing systems, affecting the propagation and preservation of stratigraphic signals of environmental change over vast areas. The volume presents case studies discussing the geology and geomorphology of alluvial and fluvial fans from both active systems and ancient ones preserved in the stratigraphic record. It brings together case studies from a range of continents, climatic and tectonic settings, some introducing innovative monitoring and analysis techniques, and it provides an overview of current debates in the field. This volume will be of particular interest to geologists, geomorphologists, sedimentologists and the general reader with an interest in Earth science.
Author: Koji Hidaka
Publisher:
ISBN:
Category : Oscillations
Languages : en
Pages : 9
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Book Description
Author: John W. Snedden
Publisher: Cambridge University Press
ISBN: 110841902X
Category : Business & Economics
Languages : en
Pages : 343
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Book Description
A comprehensive and richly illustrated overview of the Gulf of Mexico Basin, including its reservoirs, source rocks, tectonics and evolution.
Author: Adrian M. Harvey
Publisher: Geological Society of London
ISBN: 9781862391895
Category : Science
Languages : en
Pages : 258
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Book Description
Alluvial fans are important sedimentary environments. They trap sediment delivered from mountain source areas, and exert an important control on the delivery of sediment to downstream environments, to axial drainages and to sedimentary basins. They preserve a sensitive record of environmental change within the mountain source areas. Alluvial fan geomorphology and sedimentology reflect not only drainage basin size and geology, but change in response to tectonic, climatic and base-level controls. One of the challenges facing alluvial fan research is to resolve how these gross controls are reflected in alluvial fan dynamics and to apply the results of studies of modern fan processes and Quaternary fans to the understanding of sedimentary sequences in the rock record. This volume includes papers based on up-to-date research, and focuses on three themes: alluvial fan processes, dynamics of Quaternary alluvial fans and fan sedimentary sequences. Linking the papers is an emphasis on the controls of fan geomorphology, sedimentology and dynamics. This provides a basis for integration between geomorphological and sedimentological approaches, and an understanding how fluvial systems respond to tectonic, climatic and base-level changes.
Author: Octavian Catuneanu
Publisher: Newnes
ISBN: 0080885136
Category : Technology & Engineering
Languages : en
Pages : 500
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Book Description
Principles of Sequence Stratigraphy, Second Edition presents principles to practical workflow that guide applications in a consistent manner that is independent of model, geological setting and the types and resolution of the data available. The book explains the points of agreement and difference between the various approaches to sequence stratigraphy, while also defining the common ground that affords the standard application of the method. This enables the practitioner to avoid nomenclatural and methodological confusions and apply sequence stratigraphy. The text is richly illustrated with hundreds of full-color diagrams and examples of outcrop, borehole and seismic data. The book's balanced approach helps students and professionals acquire a sound understanding of the concepts and methodology. It will appeal to geologists, geophysicists and engineers with interest in basin analysis, stratigraphy and sedimentology, as well as in all economic applications that concern the exploration and production of natural resources, including water, hydrocarbons, coal and sediment-hosted mineral deposits. Updates the award-winning first edition in all aspects of sequence stratigraphy, from the underlying theory to the practical applications Presents the standard approach to sequence stratigraphic methodology, nomenclature, and classification; the role of modeling in sequence stratigraphy, and the difference between modeling and methodology Discusses the roles of scale and stratigraphic resolution in sequence stratigraphy, and the workflow that affords a consistent application of the method irrespective of the types of data available Describes the three-dimensional nature of the stratigraphic architecture, and the variability of stratigraphic sequences with the tectonic setting, depositional setting, and the climatic regime Illustrates all concepts with high-quality, full-color diagrams, outcrop photographs, and subsurface well data and seismic images
Author: Peter A. Scholle
Publisher: AAPG
ISBN: 0891813071
Category : Sandstone
Languages : en
Pages : 405
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Book Description
Author: Gabriel Giacomone
Publisher:
ISBN:
Category :
Languages : en
Pages : 132
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Book Description
Basin floor fans can contain a wide range of grain sizes, though the most frequently described fans have tended to be the fine-grained sandy and muddier ones. A coarse-grained category of fan has been broadly described previously, but it lacks a depositional and facies model. The Mid-Jurassic deep-water marine deposits of Los Molles Fm. in Neuquén Basin, Argentina is an example of this type of fan and it is well exposed in outcrop. A detailed characterization of the basin-floor fans of La Jardinera is used to build a coarse-grained fan model. We made use of a high-resolution satellite image, drone imagery and 4000 m of logs with detailed measurements to build isopach and net/gross (NG) maps that with facies analysis allowed reconstruction of the fan and its lobe complexes (LC1-5). In addition, grain size, facies and bed thickness trends were used to refine the interpretation at a lobe scale within unit LC3. Lithofacies, NG ratios and sandstone body geometry helped define six facies associations; hemipelagic deposits, lobe fringe, off-axis lobes, on-axis lobes, distributary channels and debris flows. The facies associations build lobes (10 m thick) and these are grouped into lobe complexes (~20-40 m thick). The studied five lobe complexes (LC1-5) are separated by fine-grained intervals (~ 4 m thick in average). The fan shows paleoflow trends towards the northwest at the bottom gradually changing to northeast at the top. The lobe complexes stack forward and backstep gently, with no major switches; they aggrade and shift laterally in an autocyclic manner, following topographic lows left by previous deposits. The maps at lobe complex scale show an overall elongated morphology and serrated geometries downdip, a normal response of focused sediment dispersal associated with channels and high-density turbidity currents. Detailed study of lobes 3 and 4 in LC3 show that proximal to lobe axis beds are thicker (40 cm), grain size is greater (medium sand to granules) and main facies are conglomerates and structureless sandstones. Off axis, beds are thinner (
Author: T. Oguchi
Publisher:
ISBN:
Category : Geology
Languages : en
Pages :
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Book Description
Author: A. D. Abrahams
Publisher: Springer Science & Business Media
ISBN: 9401582548
Category : Science
Languages : en
Pages : 1021
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Book Description
Over the last twenty years there has been a major expansion of knowledge in the field of landforms and landforming processes of deserts. This advanced-level book provides a benchmark for the current state of science, and is written by an international team of authors who are acknowledged experts in their fields.
