Download or read book Coastal Erosion Along Monterey Bay written by Anastasios I. Sklavidis and published by . This book was released on 1985 with total page 224 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Coastal Erosion Along Monterey Bay written by Timothy McGee and published by . This book was released on 1986 with total page 96 pages. Available in PDF, EPUB and Kindle. Book excerpt: Coastal erosion, as inferred by measuring bluff recession is correlated with wave height at 12 sites along the Monterey Bay coastline. Bluff recession rates are established by applying precise photogrammetric techniques to a 44-year time series of aerial photographs. Wave heights are determined from the USACE Wave Information Studies spectral wave climatology, where deep water gravity waves are hindcast from historic wind fields at three-hour intervals from Jan 56-Dec 75. The deep water spectra are refracted to shallow water spectra at a nominal depth of 4m. An erosion model is developed for Monterey Bay where the erosion process is modelled as a non-linear function of the 4-m significant wave height: R=(AHs sq) + BHs + C(Tide + 1.02Hs - Clifftoe)/Beach Slope. The coefficients A, B, C are computed from a least squares regression of the modelled and observed recession rate values. The erosion model provides a reasonable representation of the erosion process in Monterey Bay, where the mean standard error between observed and modelled erosion rates is + or - 0.17 m/yr. Adjustment of the wave energy coefficient, A, allows tuning of the model for high and low wave energy locations. Keywords: Ocean waves; California; Photogrammetry; Refraction; Cliffs.
Download or read book Coastal Erosion Along Monterey Bay written by A. I. Sklavidis and published by . This book was released on 1985 with total page 108 pages. Available in PDF, EPUB and Kindle. Book excerpt: Permanent beach erosion in Southern Monterey Bay, CA, is episodic, occurring infrequently when high tides coincide with stormy weather which allows wave action to erode the toe of the cliffs. This thesis uses precise aerial photogrammmetric techniques to measure cliff recession from 1946 through 1984. Maximum erosion occurs in the vicinity of Fort Ord (7.3 ft.yr) and decreases to the south. A model is developed to predict cliff erosion based on the hypothesis that erosion occurs only when the water level due to combined tides, wave set-up and run-up exceeds the toe the cliff elevation. The model combines predicted tidal elevations and wave heights. Shallow water wave heights at various locations are calculated by transforming deep-water directional wave spectra provided by the Fleet Numerical Oceanography Center. Refraction of the wave energy is responsible for the variabillity of erosion rates along the shore. The bathymetry of Monterey Bay is such that the refracted wave energy is greater in the Fort Ord area than to the south. The erosion model was calibrated using the spectral wave climatology and aerial photographs covering an 18 year period. The model qualitatively replicates the temporal variability of the measured recession rates and gives a reasonable prediction of the spatial variation of the mean recession rates. Keywords: Errors, Cliff recession.
Download or read book Interaction of Seawalls and Beaches written by and published by . This book was released on 1997 with total page 84 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Long term Beach Width Change in Monterey Bay California written by David William Reid and published by . This book was released on 2004 with total page 230 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Hydrodynamics Sediment Transport and El Ni o induced Seacliff Erosion Along the Coastline of Central California written by Curt Daron Storlazzi and published by . This book was released on 2000 with total page 350 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Between Paradise and Peril written by Gary Griggs and published by . This book was released on 2018-09-12 with total page 212 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Monterey Bay Region seems to have it all - beaches, sunshine, the redwoods and rivers. This scenic landscape owes its origins to the underlying geology and climate, both of which are unpredictable. This book recounts the many earthquakes and landslides, floods and droughts, that have impacted the area through the lens of a geologist.
Download or read book Daily Changes in Beach Profile and Sand Texture on Del Monte Beach California written by John C. Harlett and published by . This book was released on 1967 with total page 120 pages. Available in PDF, EPUB and Kindle. Book excerpt: Beach-elevation measurements were made and sand samples were collected along a single profile daily at low tide during the period from February 1 through March 31, 1967. Wave and tide data were recorded continuously. The beach, composed of medium-to-fine quartz and feldspar sand, is well sheltered from wave action. Wave steepness exerts a great influence on the beach profile. An equilibrium profile was found to exist for a given wave steepness. As wave conditions change, the beach profile tends to change toward the equilibrium profile associated with the new wave steepness. Given an initial beach profile, the amounts of cut and fill that will occur with a given change in wave steepness can be predicted. Textural parameters do not appear to be related to changing wave conditions in a simple way. Equilibrium values of mean grain size, sorting, skewness, and kurtosis exist for any given location on the beach profile. The equilibrium values are apparently indepdent of wave conditions. (Author).
Download or read book Living with the Changing California Coast written by Gary Bruce Griggs and published by Univ of California Press. This book was released on 2005-11-07 with total page 553 pages. Available in PDF, EPUB and Kindle. Book excerpt: Crowded into the beautiful, narrow strip at the edge of the ocean, the large number of people who live near California's dynamic coastline often have little awareness of the hazards—waves, tides, wind, storms, rain, and runoff—that erode and impact the coast and claim property on a regular basis. This up-to-date, authoritative, and easy-to-use book, a geological profile of the California coast from Mexico to the Oregon border, describes the landforms and processes that shape the coastline and beaches, documents how erosion has affected development, and discusses the options that are available for dealing with coastal hazards and geologic instability. A completely revised and updated edition of Living with the California Coast (1985), this book features hundreds of new photographs and the latest data on human activity on the coast, on climate change, on rising seas levels, and on coastal erosion and protection. With its dramatic photographs and mile-by-mile maps, Living with the Changing California Coast will be an essential resource for those intending to buy or build along the coast, those who need specific information about various coastal regions, and those who are seeking information about how this remarkable coastline has evolved. *279 photographs portray natural coastal features and processes and illustrate many instances of what can happen to buildings on the coast *81 maps, covering the entire coast, detail types of coastal landforms, coastline erosion rates, locations of seawalls or armor, and other specific areas of interest *Offers specific advice for homebuyers,residents, and developers on which areas to avoid, on what safety measures should be taken, and on what danger signals should be heeded
Download or read book Santa Cruz County Calif Beach Erosion Control Study written by United States. Army. Corps of Engineers and published by . This book was released on 1958 with total page 120 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Sand Mining Impacts on Long Term Dune Erosion in Southern Monterey Bay written by and published by . This book was released on 2006 with total page 15 pages. Available in PDF, EPUB and Kindle. Book excerpt: Southern Monterey Bay was the most intensively mined shoreline (with sand removed directly from the surf zone) in the U.S. during the period from 1906 until 1990, when the mines were closed following hypotheses that the mining caused coastal erosion It is estimated that the yearly averaged amount of mined sand between 1940 and 1984 was 128,000 m3/yr, which is approximately 50% of the yearly average dune volume loss during this period. To assess the impact of sand mining, erosion rates along an 18km range of shoreline during the times of intensive sand mining (1940-2004). Most of the shoreline is composed of unconsolidated sand with extensive sand dunes rising up to a height of 46 m, vulnerable to the erosive forces of storm waves. Erosion is defined here as a recession of the top edge of the dune. Recession was determined using stereo-photogrammetry, and LIDAR and OPS surveys. Long-term erosion rates vary from about 0.5 m/y in the middle of the range, and then decrease northward. Erosion events are episodic and occur when storm waves and high tides coincide, allowing swath to undercut the dune and resulting in permanent recession. Erosion appears to be correlated with the occurrence of El Ninos. The calculated volume lots of the dune in southern Monterey Bay during the 1997-98 El Nino winter was 1,820,000 m3/yr. After cessation of sand mining in 1990, the erosion rates decreased at locations in the southern end of the bay but have not significantly changed at other locations.
Download or read book Sand Movement Along a Portion of the Northern California Coast written by John Cherry and published by . This book was released on 1965 with total page 330 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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).
Download or read book California s Battered Coast written by and published by . This book was released on 1985 with total page 426 pages. Available in PDF, EPUB and Kindle. Book excerpt: Tracings: 94.42, 94.48.
Download or read book Living with the Changing California Coast written by Gary B. Griggs and published by Univ of California Press. This book was released on 2005 with total page 566 pages. Available in PDF, EPUB and Kindle. Book excerpt: "The goal of The Changing California Coast is to provide perspective on the realities of living on the California coast, its challenges and issues, and the nitty gritty of what to consider before buying or building a house. The book achieves this aim by providing a tutorial on the potential hazards of coastal living, and systematically covering the coast from border to border. A must read for anyone whose idea of the coast is based on too many episodes of Baywatch."--Paul D. Komar, author of Beach Processes and Sedimentation "California's coast is a living landscape endlessly besieged by waves and tides, upland erosion, seismic forces, and human efforts to secure land's edge in place. A geography of awesome beauty and constant conflict, the coast is where people want to be. Living with the Changing California Coast is a must read for property owners, developers, investors, public officials, and activists who care about our coast's future. This book lays out the consequences of our tendency to wall up the coast and what we might do to reverse the trend. A most thorough, alarming and compelling tale of what is happening to our shoreline. Will policy makers listen?"--Peter Douglas, Executive Director of the California Coastal Commission
Download or read book Sediment Budget for Monterey Bay written by Emmanuel N. Oradiwe and published by . This book was released on 1986 with total page 106 pages. Available in PDF, EPUB and Kindle. Book excerpt: A sediment budget analysis based on the principle of mass conservation is performed for Monterey Bay. The various littoral processes in the Bay are evaluated quantitatively. The results indicate that about 2.1 million cubic yards of sand are deposited annually into the Bay, which is treated as a quasi-closed system. Deposition from cliff erosion, computed from the cliffs profile changes, amounted to 5.6 million cubic yards, and accounted for 27% of the total deposit. River discharges were extrapolated using a power law formula; the total yield was 1.4 million cubic yards, representing 54% of the entire sediment deposition. The potential longshore drift was evaluated using a 18 years spectral wave climatology; its contribution was 4.09 million cubic yards which amounts to 19%. Sediment losses accrued from submarine canyon deposition, sand mining operations, offshore deposition by rip currents and eolian sediment transport to the dunes; these losses amounted to 2.34 million cubic yards and were all estimates taken from previous studies. The budget deficit signifies an erosion trend along the Bay. The effects of sand mining to coastal erosion are discussed. Recommendations needed to refine the budget analysis and to establish a correlation between the budget deficit and shoreline erosion are presented for further research.
Download or read book Assessment and Atlas of Shoreline Erosion Along the California Coast written by California. Department of Navigation and Ocean Development and published by . This book was released on 1977 with total page 370 pages. Available in PDF, EPUB and Kindle. Book excerpt:
