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Author: David Samuel Macarthur
Publisher:
ISBN:
Category : Beaches
Languages : en
Pages : 26
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Book Description
Tracer experiments were conducted on the Gulf Coast beach of Hurricane Island, Florida, to obtain information on sediment transfer between foreshore, trough, and bar topography. Concurrent measurements of waves and currents were collected. Along-shore transport of tracer released in the three topographic zones was greater than normal-to-shore movement, even when the angle between wave crests and the shoreline was small. Seaward movement of tracer placed in the trough and bar zones took place during alongshore transport only when waves broke on the bar, and was most marked when wave steepness had a value near 0.04. During these conditions tracer released in the trough moved onto and along the bar crest. At other times landward displacement of bar and trough tracer accompanied alongshore transport. Tracer placed on the bar moved into the trough. Only when a subaqueous shoal replaced the trough immediately seaward of the beach step did appreciable amounts of tracer seaward from the foreshore. Rhythmic topography appears, therefore, to provide an important mechanism for onshore-offshore movement of sediment within a beach system. Transport of tracer from the trough and bar onto the foreshore was negligible over all experiments.
Author: David Samuel Macarthur
Publisher:
ISBN:
Category : Beaches
Languages : en
Pages : 26
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Book Description
Tracer experiments were conducted on the Gulf Coast beach of Hurricane Island, Florida, to obtain information on sediment transfer between foreshore, trough, and bar topography. Concurrent measurements of waves and currents were collected. Along-shore transport of tracer released in the three topographic zones was greater than normal-to-shore movement, even when the angle between wave crests and the shoreline was small. Seaward movement of tracer placed in the trough and bar zones took place during alongshore transport only when waves broke on the bar, and was most marked when wave steepness had a value near 0.04. During these conditions tracer released in the trough moved onto and along the bar crest. At other times landward displacement of bar and trough tracer accompanied alongshore transport. Tracer placed on the bar moved into the trough. Only when a subaqueous shoal replaced the trough immediately seaward of the beach step did appreciable amounts of tracer seaward from the foreshore. Rhythmic topography appears, therefore, to provide an important mechanism for onshore-offshore movement of sediment within a beach system. Transport of tracer from the trough and bar onto the foreshore was negligible over all experiments.
Author: David Samuel McArthur
Publisher:
ISBN:
Category : Coast changes
Languages : en
Pages : 76
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Book Description
Author: Derek Jackson
Publisher: Elsevier
ISBN: 0081029276
Category : Science
Languages : en
Pages : 814
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Book Description
Sandy beaches represent some of the most dynamic environments on Earth and examining their morphodynamic behaviour over different temporal and spatial scales is challenging, relying on multidisciplinary approaches and techniques. Sandy Beach Morphodynamics brings together the latest research on beach systems and their morphodynamics and the ways in which they are studied in 29 chapters that review the full spectrum of beach morphodynamics. The chapters are written by leading experts in the field and provide introductory level understanding of physical processes and resulting landforms, along with more advanced discussions. Includes chapters that are written by the world's leading experts, including the latest up-to-date thinking on a variety of subject areas Covers state-of-the-art techniques, bringing the reader the latest technologies/methods being used to understand beach systems Presents a clear-and-concise description of processes and techniques that enables a clear understanding of coastal processes
Author: Engineer School Library (Fort Belvoir, Va.)
Publisher:
ISBN:
Category : Beach erosion
Languages : en
Pages : 136
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Book Description
Author: Scott L Douglass
Publisher: World Scientific
ISBN: 9814338060
Category : Science
Languages : en
Pages : 102
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Book Description
This book tells you where beach sand comes from, how waves are formed and how they break and move sand down the coast, how “works of man” have blocked this movement and caused beach erosion, and what can be done to save the beaches for future generations of Americans. A three-part prescription for healthy beaches is proposed: “backing off”, “bypassing sand”, and “beach nourishment”. So if you love waves and beaches, and care about the future of your favorite beach spot, then read this book while you enjoy the beach.
Author: John Cherry
Publisher:
ISBN:
Category : Beach erosion
Languages : en
Pages : 330
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Book Description
Long-term beach and offshore sand movement along the northern California coast between Drakes Bay and Russian River is studied. Analysis of wave, sand and geological data, coupled with known configurations and behavioral processes of stable beaches, suggests little net alongshore movement under present conditions and that beaches are generally in equilibrium with negligible loss. This analysis is confirmed through heavy mineral analysis of surface samples. Point Reyes and Bodega Head are indicated to be effective littoral barriers to alongshore transport. (Author).
Author: National Research Council
Publisher: National Academies Press
ISBN: 0309255945
Category : Science
Languages : en
Pages : 274
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Book Description
Tide gauges show that global sea level has risen about 7 inches during the 20th century, and recent satellite data show that the rate of sea-level rise is accelerating. As Earth warms, sea levels are rising mainly because ocean water expands as it warms; and water from melting glaciers and ice sheets is flowing into the ocean. Sea-level rise poses enormous risks to the valuable infrastructure, development, and wetlands that line much of the 1,600 mile shoreline of California, Oregon, and Washington. As those states seek to incorporate projections of sea-level rise into coastal planning, they asked the National Research Council to make independent projections of sea-level rise along their coasts for the years 2030, 2050, and 2100, taking into account regional factors that affect sea level. Sea-Level Rise for the Coasts of California, Oregon, and Washington: Past, Present, and Future explains that sea level along the U.S. west coast is affected by a number of factors. These include: climate patterns such as the El Niño, effects from the melting of modern and ancient ice sheets, and geologic processes, such as plate tectonics. Regional projections for California, Oregon, and Washington show a sharp distinction at Cape Mendocino in northern California. South of that point, sea-level rise is expected to be very close to global projections. However, projections are lower north of Cape Mendocino because the land is being pushed upward as the ocean plate moves under the continental plate along the Cascadia Subduction Zone. However, an earthquake magnitude 8 or larger, which occurs in the region every few hundred to 1,000 years, would cause the land to drop and sea level to suddenly rise.
Author: William Christian Krumbein
Publisher:
ISBN:
Category : Coast changes
Languages : en
Pages : 52
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Author: James C. Ingle
Publisher:
ISBN:
Category : Beach erosion
Languages : en
Pages : 240
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Book Description
Author: Defense Documentation Center (U.S.)
Publisher:
ISBN:
Category : Soil erosion
Languages : en
Pages : 402
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Book Description
