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Nearshore Currents Over A Barred Beach
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Book Synopsis Nearshore Currents Over a Barred Beach by : Antonio Fernando Garcez Faria
Download or read book Nearshore Currents Over a Barred Beach written by Antonio Fernando Garcez Faria and published by . This book was released on 1997 with total page 182 pages. Available in PDF, EPUB and Kindle. Book excerpt: The objective of this dissertation is to develop numerical models and compare their predictions with data acquired during the DUCK94 experiment in order to improve our physical understanding of the hydrodynamic processes governing the vertical and cross shore distributions of both longshore and cross shore currents over a barred beach. The vertical structure of the mean longshore current is found to be well described by a logarithmic profile and a relationship between bed shear stress and bottom roughness, including the influence of ripples and mega-ripples, was also found. The vertical structure of the mean cross shore current (undertow) is modeled using an eddy viscosity closure scheme to solve for the turbulent shear stress and includes contributions from breaking wave rollers. These models of the vertical profiles of longshore and cross shore mean currents are combined to formulate a quasi three dimensional model to describe the cross shore distribution of the longshore current. This model includes turbulent mixing due to the cross shore advection of mean momentum of the longshore current by the mean cross shore current and contributions from wave rollers.
Book Synopsis Wind and Wave Forcing of Longshore Currents Across a Barred Beach by : Dennis James Whitford
Download or read book Wind and Wave Forcing of Longshore Currents Across a Barred Beach written by Dennis James Whitford and published by . This book was released on 1988 with total page 238 pages. Available in PDF, EPUB and Kindle. Book excerpt: Previous investigations of longshore currents have included simplifying assumptions and restriction (such as a planar beach, a steady and depth uniform flow, spatially-variant bed shear stress and turbulent momentum exchange, and the exclusion of surface wind stress. These assumptions are quantitatively investigated by calculating the relative importance of each term in the longshore momentum balance with an emphasis on the relative importance of wind forcing across the barred nearshore. Wind and wave forcing of longshore currents across a barred beach are examined using both a numerical model and field measurements. A local momentum balance was measured at various locations across the surf zone during the SUPERDUCK experiment held at the USACE CERC Field Research Facility, Duck, N.C. in October 1986. A moveable sled was instrumented with pressure, current, and wind sensors to measure the various terms in the longshore momentum equation. Stability-dependent atmospheric drag coefficients for the surf zone are determined from wind stress measurements acquired just beyond the surf zone and wind speed measurements acquired from an anemometer atop the 9 m sled mast. Breaking waves were visually identified and electronically marked on the data tapes. Keywords: Ocean currents; Air water interactions; Nearshore surf zone; Wind stress; Theses. (EDC).
Book Synopsis Introduction to Coastal Processes and Geomorphology by : Robin Davidson-Arnott
Download or read book Introduction to Coastal Processes and Geomorphology written by Robin Davidson-Arnott and published by Cambridge University Press. This book was released on 2019-09-19 with total page 541 pages. Available in PDF, EPUB and Kindle. Book excerpt: Grounded in current research, this second edition has been thoroughly updated, featuring new topics, global examples and online material. Written for students studying coastal geomorphology, this is the complete guide to the processes at work on our coastlines and the features we see in coastal systems across the world.
Book Synopsis A Simple Quasi-three Dimensional Model of Longshore Currents Over Arbitrary Profile by : Antonio Fernando Garcez Faria
Download or read book A Simple Quasi-three Dimensional Model of Longshore Currents Over Arbitrary Profile written by Antonio Fernando Garcez Faria and published by . This book was released on 1995 with total page 52 pages. Available in PDF, EPUB and Kindle. Book excerpt: The long shore current maximum observed in the trough of a barred beach during the nearshore dynamics experiment DELILAH at Duck, North Carolina, is not predicted by present theory. The simplest longshore curren models balance cross-shore changes in the alongshore wave momentum (radiation stress) with the alongshore bottom shear stress. Waves break over the bar, reform in the trough and again break on the foreshore resulting in changes in the radiation stress, which predicts two jets, one over the bar and the other at the foreshore, which does not agree with the observed current maximum in the trough. The advection of the momentum of the longshore current by mean cross-shore currents as a source of momentum mixing is investigated. The longshore current is strongest toward the surface and decreasing to zero at the bottom. The cross-shore mean current has an onshore transport in the wave crest/trough region and an offshore transport beneath (undertow). The net interaction can induce significant lateral mixing of the alongshore momentum of the mean currents, which is shown using a simplified three- dimension model of nearshore currents to explain much of the differences with observations.
Book Synopsis Coastal Engineering 2004 - Proceedings Of The 29th International Conference (In 4 Vols) by : Smith Jane Mckee
Download or read book Coastal Engineering 2004 - Proceedings Of The 29th International Conference (In 4 Vols) written by Smith Jane Mckee and published by World Scientific. This book was released on 2005-04-08 with total page 4840 pages. Available in PDF, EPUB and Kindle. Book excerpt: This comprehensive and up-to-date volume contains 367 papers presented at the 29th International Conference on Coastal Engineering, held in Lisbon, Portugal, 19-24 September 2004. It is divided into five parts: waves; long waves, nearshore currents, and swash; sediment transport and morphology; coastal management, beach nourishment, and dredging; coastal structures. The contributions cover a broad range of topics including theory, numerical and physical modeling, field measurements, case studies, design, and management. Coastal Engineering 2004 provides engineers, scientists, and planners state-of-the-art information on coastal engineering and coastal processes.The proceedings have been selected for coverage in:Index to Scientific & Technical Proceedings (ISTP CDROM version / ISI Proceedings)CC Proceedings - Engineering & Physical Sciences
Book Synopsis A Summary of Research 1995 by : United States. Naval Postgraduate School, Monterey, CA.
Download or read book A Summary of Research 1995 written by United States. Naval Postgraduate School, Monterey, CA. and published by . This book was released on 1995 with total page 588 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Coastal Engineering 2008 written by and published by . This book was released on with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Asian and Pacific Coasts 2003 by : Yoshimi G?da
Download or read book Asian and Pacific Coasts 2003 written by Yoshimi G?da and published by World Scientific. This book was released on 2004 with total page 1583 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book presents the experience of coastal and port engineering development, as well as coastal environmental problems, in Asian and Pacific countries. It also provides information and promotes technological progress and activities, international technical transfer and cooperation, and opportunities for engineers and researchers to maintain and improve scientific and technical competence. The subject areas are not limited to the classical topics of coastal engineering but are extended to related fields, including environments, marine ecology, coastal oceanography, fishery, etc.
Book Synopsis Asian and Pacific Coasts 2003 by : Yoshimi Goda
Download or read book Asian and Pacific Coasts 2003 written by Yoshimi Goda and published by World Scientific. This book was released on 2004-02-19 with total page 304 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book presents the experience of coastal and port engineering development, as well as coastal environmental problems, in Asian and Pacific countries. It also provides information and promotes technological progress and activities, international technical transfer and cooperation, and opportunities for engineers and researchers to maintain and improve scientific and technical competence. The subject areas are not limited to the classical topics of coastal engineering but are extended to related fields, including environments, marine ecology, coastal oceanography, fishery, etc. Contents:Climate Change and Sea-Level Rise: Challenges to Coastal Science and Engineering (N Mimura)Visualization of Tidal Oscillation in the Taiwan Strait (W J Juang et al.)Comparison and Characterization of Bottom Mounted Wave Directional System (T Nagai et al.)Study of the Effect of Harbor Shapes on Wave Induced Oscillations (A B Derun & M Isobe)Long-Term Shoreline Changes Using Aerial Photos on the Namhangjin Coast (S Jung et al.)Analysis of Chloride Ion Penetration in Marine Concrete Structure (S H Han & W S Park)Research on Influence of Hangzhou Bay Major Bridge to Qiantang Bore (S Xiong et al.)Field Observation of Water Environment in Ariake Bay (Y Koibuchi & I Isobe)Present Situation of Coastal Protection System in Island Countries in the South Pacific (P Vanualailai & N Mimura)Remote Sensing of Chlorophyll Concentration in a Bay from Landsat TM Data (S Aoki)and other papers Readership: Graduate students, academics, researchers, consulting engineers and industrialists (construction and fishery) in ocean engineering, fish and marine biology, and oceanography. Keywords:Coastal Oceanography;Coastal Meteorology;Coastal Sediments;Coastal and Harbor Structures;Coastal Fishery;Coastal Environments;Marine Ecology;Coastal Zone Management
Book Synopsis 1990 DELILAH Nearshore Experiment by :
Download or read book 1990 DELILAH Nearshore Experiment written by and published by . This book was released on 1997 with total page 222 pages. Available in PDF, EPUB and Kindle. Book excerpt: This report summarizes the primary data sets collected during the DELILAH nearshore experiment held in October 1990 at the Field Research Facility, Coastal and Hydraulics Laboratory, U.S. Army Engineer Waterways Experiment Station. DELILAH was designed to investigate the physics of the nearshore zone using a large array of stationary and mobile instruments, video cameras, radar systems, and precision surveys. This report was prepared to document and publicize the DELILAH data set. It complements a growing series of technical papers, reports, theses, dissertations, and other results based on DELILAH data. These data are available electronically on-line or via other media such as CD-ROM.
Book Synopsis Coastal Engineering 2002: Solving Coastal Conundrums - Proceedings Of The 28th International Conference (In 3 Vols) by : Smith Jane Mckee
Download or read book Coastal Engineering 2002: Solving Coastal Conundrums - Proceedings Of The 28th International Conference (In 3 Vols) written by Smith Jane Mckee and published by World Scientific. This book was released on 2003-03-14 with total page 4008 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book contains more than 300 papers presented at the 28th International Conference on Coastal Engineering, held in Cardiff, Wales, in July 2002. It is divided into five parts: coastal waves; nearshore currents, swash, and long waves; coastal structures; sediment transport; and coastal morphology, beach nourishment, and coastal management. The papers cover a broad range of topics, including theory, numerical and physical modeling, field measurements, case studies, design, and management. Coastal Engineering 2002 provides engineers, scientists, and planners with state-of-the-art information on coastal engineering and coastal processes.
Book Synopsis Mechanics of Coastal Sediment Transport by : Jørgen Fredsøe
Download or read book Mechanics of Coastal Sediment Transport written by Jørgen Fredsøe and published by World Scientific Publishing Company. This book was released on 1992-11-02 with total page 392 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book treats the subject of sediment transport in the marine environment, covering transport of noncohesive sediment by waves and currents in- and outside the surf zone. It can be read independently, but a background in hydraulics and basic wave mechanics is required. The primary aim of the book is to describe the physical processes of sediment transport and how to represent them in mathematical models. The book can be divided in two main parts; in the first, the relevant hydrodynamic theory is described. This part contains a review of elementary theory for water waves, chapters on the turbulent wave boundary layer and the turbulent interaction between waves and currents, and finally, surf zone hydrodynamics and wave driven currents. The second part covers sediment transport and morphological development.The part on sediment transport introduces the basic concepts (critical bed shear stress, bed load, suspended load and sheet layer, near-bed concentration, effect of sloping bed); it treats suspended sediment in waves and current and in the surf zone, and current and wave-generated bed forms. Finally, the modelling of cross-shore and long-shore sediment transport is described together with the development of coastal profiles and coastlines.
Book Synopsis Compilation of Theses Abstracts, October 1994-September 1995 by : United States. Naval Postgraduate School, Monterey, CA.
Download or read book Compilation of Theses Abstracts, October 1994-September 1995 written by United States. Naval Postgraduate School, Monterey, CA. and published by . This book was released on 1995 with total page 564 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Literature Review on the Geologic Aspects of Inner Shelf Cross-shore Sediment Transport by : J. Bailey Smith
Download or read book Literature Review on the Geologic Aspects of Inner Shelf Cross-shore Sediment Transport written by J. Bailey Smith and published by . This book was released on 1995 with total page 168 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Topics in Longshore Currents by : John Casey Church
Download or read book Topics in Longshore Currents written by John Casey Church and published by . This book was released on 1993 with total page 140 pages. Available in PDF, EPUB and Kindle. Book excerpt: The momentum equation governing mean longshore currents on straight beaches is a balance of forcing from the momentum transfer of the oscillatory wave motion, turbulent momentum transfer (mixing), and bottom stress. Of these, the wave's contribution is well understood, but the remaining two are not, principally due to the complicated hydrodynamics of the surf-zone. Addressing the bottom stress term, a longshore current model is developed which includes a modification of the bottom stress due to the effects of breaking-wave induced turbulence. A one-dimensional turbulent kinetic energy equation is used to model this breaking-wave induced turbulence, producing a spatially varying bottom friction coefficient. The modeled longshore current cross-shore profiles show improved agreement with field observations. In a second bottom stress study, vertical profiles of mean longshore currents are examined using field data obtained with vertically stacked electromagnetic current meters with the goal of measuring the bottom stress and its associated drag coefficient. The profiles are observed to become vertically uniform whenever the ratio of wave height to depth exceeds 0.3, indicating that nearly all of the waves passing a given location are breaking. Finally, horizontal turbulent momentum transfer (mixing) is examined for the case of shear instabilities of the longshore current.
Book Synopsis A Guide to Modeling Coastal Morphology by : Dano Roelvink
Download or read book A Guide to Modeling Coastal Morphology written by Dano Roelvink and published by World Scientific. This book was released on 2012 with total page 291 pages. Available in PDF, EPUB and Kindle. Book excerpt: Process-based morphodynamic modelling is one of the relatively new tools at the disposal of coastal scientists, engineers and managers. On paper, it offers the possibility to analyse morphological processes and to investigate the effects of various measures one might consider to alleviate some problems. For these to be applied in practice, a model should be relatively straightforward to set up. It should be accurate enough to represent the details of interest, it should run long enough and robustly to see the real effects happen, and the physical processes represented in such a way that the sediment generally goes in the right direction at the right rate. Next, practitioners must be able to judge if the patterns and outcomes of the model are realistic and finally, translate these colour pictures and vector plots to integrated parameters that are relevant to the client or end user. In a nutshell, this book provides an in-depth review of ways to model coastal processes, including many hands-on exercises.
Book Synopsis Random Seas And Design Of Maritime Structures (3rd Edition) by : Goda Yoshimi
Download or read book Random Seas And Design Of Maritime Structures (3rd Edition) written by Goda Yoshimi and published by World Scientific Publishing Company. This book was released on 2010-06-23 with total page 732 pages. Available in PDF, EPUB and Kindle. Book excerpt: Random waves are the most important constituent of the sea environment, as they make the design of maritime structures quite different from that of structures on land. In this book, the concept of random waves for the design of breakwaters, seawalls, and harbor structures is fully explored for easy comprehension by practicing engineers. Theoretical aspects are also discussed in detail for further studies by graduate students and researchers.
