Download or read book Lagrangian Observations of Surfzone Currents written by Wilford Edward Schmidt and published by . This book was released on 2003 with total page 224 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Lagrangian Observations of Rip Currents written by and published by . This book was released on 2007 with total page 43 pages. Available in PDF, EPUB and Kindle. Book excerpt: A comprehensive field rip-current experiment (RCEX) was conducted from 14 April to 18 May 2007 in Sand City, California, on Monterey Bay. Lagrangian observations were made with inexpensive (1 50), handheld, Differential Global Positioning Systems (DGPS) mounted on surf zone drifters. The inexpensive DGPS requires post-processing to achieve accuracy O(0.4m) and O(0.01m/s). Thirty drifters were constructed and deployed in well-developed, rip-currents to map the circulation patterns for the first time in the field at a high spatial resolution. Drifter observations obtained during three-hour periods on seven different days under varying wave and tidal conditions describe eddies with a rotational period of 4.7min, confined to the surf-zone and coupled to the rip morphology. On average, three drifters per hour exited the surfzone. Dependent upon wave conditions, one or two eddies existed between 90m-spaced rip-channels, creating a seaward flow in the channels and shoreward flow over the shoals. Cross-shore volumetric flow rates for an alongshore transect through the eddy centers balance to a difference of less than 10% of the gross flow discharge. Velocity measurements obtained from drifter data are evaluated with velocities obtained from stationary, in-situ instruments.
Download or read book Lagrangian Field Observations of Rip Currents written by Jeffrey W. Brown and published by ProQuest. This book was released on 2008 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Field Measurements and Modeling of Surfzone Currents on Inhomogeneous Beaches written by and published by . This book was released on 2009 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Field observations of surfzone current patterns on open coast, alongshore inhomogeneous (rip-channeled) beaches during varying wave and tidal conditions are described for three different sites (Monterey, CA; Truc Vert, France; Perranporth, United Kingdom). Bathymetry, offshore waves, tidal elevation, in-situ co-located pressure and current observations, and Lagrangian drifter measurements were obtained, and data analysis procedures are explained. Two distinct surfzone current patterns were observed: (1) an alongshore sinuous current pattern coupled to the underlying bathymetry, and (2) a rip current circulation pattern. To date, alongshore currents have primarily been observed and described on alongshore homogeneous beaches. Surprisingly, new observations on alongshore inhomogeneous beaches found that sinuous alongshore currents occurred for 40% of the time, rather than the expected rip current circulation. Alongshore sinuous currents typically occurred during low waves and mid-tides, associated with small differences in wave angle from shore-normal. Numerical results from XBeach show that the surfzone alongshore momentum balance is between the alongshore pressure gradient and the combination of alongshore wave forcing and non-linear advective acceleration. The alongshore (a)symmetrical balance of terms was the distinguishing factor between alongshore sinuous currents and rip currents. Rip currents typically developed during large waves and/or low tides, which consisted of coherent surfzone eddies, bound in the cross-shore by the surf zone width, and in the alongshore by the quasi-periodic rip channel spacing. These rip currents episodically exited the surf zone (~ 15% per hour), indicating a greater amount of surf zone retention than previously thought. A "human drifter" was observed to mimic the response of the surfzone drifters, having a 10% chance of exiting the surf zone. Most observed rip current systems were asymmetric, circulating in one dominant direction. Therefore, following the traditional advice to "swim parallel" to the shoreline when trapped in a rip current, a swimmer has a 50% chance of choosing the correct alongshore direction to reach safety. These findings suggest that a beach-goer should remain calm and afloat, and they will have a 90% chance of being returned onshore to wading depths.
Download or read book Lagrangian Drifter Observations in Rip Currents written by Ronald Alan George and published by . This book was released on 1999 with total page 150 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Measuring Ocean Currents written by Antony Joseph and published by Newnes. This book was released on 2013-08-12 with total page 447 pages. Available in PDF, EPUB and Kindle. Book excerpt: Measuring Ocean Currents: Tools, Technologies, and Data covers all major aspects of ocean current measurements in view of the implications of ocean currents on changing climate, increasing pollution levels, and offshore engineering activities. Although more than 70% of the Earth is covered by ocean, there is limited information on the countless fine- to large-scale water motions taking place within them. This book fills that information gap as the first work that summarizes the state-of-the-art methods and instruments used for surface, subsurface, and abyssal ocean current measurements. Readers of this book will find a wealth of information on Lagrangian measurements, horizontal mapping, imaging, Eulerian measurements, and vertical profiling techniques. In addition, the book describes modern technologies for remote measurement of ocean currents and their signatures, including HF Doppler radar systems, satellite-borne sensors, ocean acoustic tomography, and more. Crucial aspects of ocean currents are described in detail as well, including dispersion of effluents discharged into the sea and transport of beneficial materials—as well as environmentally hazardous materials—from one region to another. The book highlights several important practical applications, showing how measurements relate to climate change and pollution levels, how they affect coastal and offshore engineering activities, and how they can aid in tsunami detection. Coverage of measurement, mapping and profiling techniques Descriptions of technologies for remote measurement of ocean currents and their signatures Reviews crucial aspects of ocean currents, including special emphasis on the planet-spanning thermohaline circulation, known as the ocean's "conveyor belt," and its crucial role in climate change
Download or read book Surf Observations and Longshore Current Prediction written by James H. Balsillie and published by . This book was released on 1975 with total page 48 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Der Turnvereinigung der Stadt Z rich written by and published by . This book was released on 1898 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book RCEX Rip Current Experiment written by and published by . This book was released on 2007 with total page 16 pages. Available in PDF, EPUB and Kindle. Book excerpt: The long-term goals are to understand surf zone processes related to rip current systems through field observations. Rip currents occur commonly on most beaches and dominate many. In the past decade, it is recognized that beaches with straight and parallel contours are not a stable morphologic configuration whereas more complex beaches, which support the existence of rip current morphology, are stable and more common. The research objectives of the proposed work focus on obtaining new observations of the three-dimensional structure of the rip current system utilizing a suite of in situ instruments. In addition, a fleet of 30 inexpensive surf zone drifters were constructed and deployed to evaluate Lagrangian observations of rip current system for evaluating mean flow patterns, vorticity, dispersion, and diffusion. The second related effort applies a numerical model (Delft3D) to evaluate the dynamics of the rip current system and its interaction with the surface wave field and bottom topography. These new observations will be used to validate Delft3D and extend our understanding of rip current processes.
Download or read book Encyclopedia of Coastal Science written by Charles W. Finkl and published by Springer. This book was released on 2019-06-25 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: This thoroughly revised and expanded edition of the much acclaimed Encyclopedia of Coastal Science edited by M. Schwarz (Springer 2005), presents an interdisciplinary approach that includes biology, ecology, engineering, geology, geomorphology, oceanography, remote sensing, technological advances, and anthropogenic impacts on coasts. Within its covers the Encyclopedia of Coastal Science, 2nd ed. brings together and coordinates many aspects of coastal and related sciences that are widely dispersed in the scientific literature. The broadly interdisciplinary subject matter of this volume features contributions by over 280 well-known international specialists in their respective fields and provides an abundance of figures in full-color with line drawings and photographs, and other illustrations such as satellite images. Not only does this volume offer a large number of new and revised entries, it also includes an illustrated glossary of coastal geomorphology, extensive bibliographic citations, and cross-references. It provides a comprehensive reference work for students, scientific and technical professionals as well as administrators, managers, and informed lay readers. Reviews from the first edition: Awarded for Excellence in Scholarly and Professional Publishing: “Honorable Mention”, in the category Single Volume/Science from the Association of American Publishers (AAP) 2005. "The contents and approach are interdisciplinary and, under a single cover, one finds subjects normally scattered throughout scientific literature." "The topics cover a broad spectrum, so does the geographic range of the contributors. ... besides geomorphologists, biologists, ecologists, engineers, geographers, geologists, oceanographers and technologists will find information related to their respective fields ... . Inclusion of appendices ... is very useful. The illustrated glossary of geomorphology will prove very useful for many of us ... ." Roger H. Charlier, Journal of Coastal Research, Volume 21, Issue 4, Page 866, July 2005. "It is an excellent work that should be included in any carefully selected list of best science reference books of the year "Summing Up: Highly recommended. " M.L. Larsgaard, Choice, Volume 43, Issue 6, Page 989, February 2006. "This volume is a comprehensive collection of articles covering all aspects of the subject: social and economic, engineering, coastal processes, habitats, erosion, geological features, research and observation." ... "As with similar works reviewed, I chose to read articles on familiar topics to see if they covered the expected, and some on unfamiliar topics to see if they could be readily understood. The book passed both tests, but the style is denser and more fact-filled than most of the encyclopedias I have reviewed." John Goodier, Reference Reviews, Volume 20, Issue 2, pages 35-36, 2006
Download or read book Proceedings of the IEEE OES Eighth Working Conference on Current Measurement Technology written by Judith Rizoli White and published by Institute of Electrical & Electronics Engineers(IEEE). This book was released on 2005 with total page 176 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book 2011 IEEE OES 10th Current Waves and Turbulence Measurements CWTM 2011 written by and published by . This book was released on 2011 with total page 282 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Long Shore Currents and Wave Statistics in the Surf Zone written by J. Ian Collins and published by . This book was released on 1972 with total page 136 pages. Available in PDF, EPUB and Kindle. Book excerpt: The report investigates some of the physical aspects of the surf zone with random seas. The statistics of wave height distributions are investigated for the surf zone over gentle sloping beaches. Longshore currents and wave set-up due to random seas are computed and compared with results for periodic waves. The mathematical stability of steady longshore currents on plane beaches is investigated and it is found that such solutions are unstable. (Author).
Download or read book Miscellaneous Report Coastal Engineering Research Center written by Coastal Engineering Research Center (U.S.) and published by . This book was released on 1976 with total page 754 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Surf Zone Currents written by and published by . This book was released on 1982 with total page 102 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The Science of Beach Lifeguarding written by Mike Tipton and published by CRC Press. This book was released on 2018-09-03 with total page 419 pages. Available in PDF, EPUB and Kindle. Book excerpt: The World Health Organization’s recently published Global Report on Drowning found that drowning is the third leading cause of unintentional injury death worldwide—making the information presented in this new book an important part of the global effort to reduce this health risk. Written by leading researchers and academics from around the world, The Science of Beach Lifeguarding focuses on the scientific evidence that underpins what is taught to and practised by beach lifeguards. It is the first book to pull together all the different areas involved in beach lifeguarding and evaluate their evidence base. An accessible and informative reference underpinned by the best current research, the book’s key themes cover the context of beach lifeguarding, the physical environment in which lifeguards work, medical aspects, practical lifeguarding techniques, physiological standards for lifeguards, safety education, and future developments in beach lifeguarding. The book presents groundbreaking work quantifying the scientific rationale behind a universally accepted fitness standard. It supplies an in-depth examination of the risks and hazards associated with the beach environment, including rip currents and cold water immersion. The book includes a state-of-the-art review of drowning and a comprehensive chapter on first aid. Detailing the recently announced 2015 European Resuscitation Council Guidelines, this book is a must-have for beach lifeguards, beach lifeguard managers, search and rescue personnel, paramedics, sports scientists, health and safety practitioners, and occupational health practitioners.
Download or read book Ocean Weather Forecasting written by Eric P. Chassignet and published by Springer Science & Business Media. This book was released on 2006-02-02 with total page 600 pages. Available in PDF, EPUB and Kindle. Book excerpt: This volume covers a wide range of topics and summarizes our present knowledge in ocean modeling, ocean observing systems, and data assimilation. The Global Ocean Data Assimilation Experiment (GODAE) provides a framework for these efforts: a global system of observations, communications, modeling, and assimilation that will deliver regular, comprehensive information on the state of the oceans, engendering wide utility and availability for maximum benefit to the community.
