Coastal Erosion Along Monterey Bay
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Coastal Erosion Along Monterey Bay
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Author : Anastasios I. Sklavidis
language : en
Publisher:
Release Date : 1985
Coastal Erosion Along Monterey Bay written by Anastasios I. Sklavidis and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1985 with Coast changes categories.
Coastal Erosion Along Monterey Bay
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Author : Timothy McGee
language : en
Publisher:
Release Date : 1986
Coastal Erosion Along Monterey Bay written by Timothy McGee and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1986 with Coast changes categories.
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.
Coastal Erosion Along Monterey Bay
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Author : A. I. Sklavidis
language : en
Publisher:
Release Date : 1985
Coastal Erosion Along Monterey Bay written by A. I. Sklavidis and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1985 with categories.
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.
Interaction Of Seawalls And Beaches
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Author :
language : en
Publisher:
Release Date : 1997
Interaction Of Seawalls And Beaches written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1997 with Beach erosion categories.
Erosion In Southern Monterey Bay
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Author :
language : en
Publisher:
Release Date : 2004
Erosion In Southern Monterey Bay written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2004 with categories.
The coastal cliff top line recession has historically been used to calculate erosion along the Southern Monterey Bay. Digital photogrammetry is used in this work to produce Digital Terrain Models (DTM), representing the coastal cliff top line of 1984. This links the historical recession data sets with the LIDAR measurements of 1997 and 1998 and a 2003 cliff top line measured using Kinematic DGPS. Recession time series starting in the 1940's are produced for several locations. Least square linear fits of the recession data are computed for the periods 1940-84, 1940-98 and 1940-03. At Fort Ord and Sand City the resulting slopes show a persistent erosion trend of 1 meter/year, unchanged in the last 19 years. The mean sea level (MSL) evolution is studied using historical San Francisco MSL data because of its high correlation with Monterey MSL. Higher MSL occurred during El Nino years, coincident with higher erosion rates show the correlation between erosion and MSL. In the long term, high-erosion El Nino years combine with normal years averaging to a near constant erosion trend. For Phillips Petroleum and Beach Lab, a significant decrease in the erosion rate is observed after sand mining stopped in Sand City. Digital Photogrammetry provides a high-quality representation of the shoreline topography, offering useful information to the warfighter in terms of detailed beach or landing zone characterizations.
Long Term Beach Width Change In Monterey Bay California
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Author : David William Reid
language : en
Publisher:
Release Date : 2004
Long Term Beach Width Change In Monterey Bay California written by David William Reid and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2004 with Beach erosion categories.
Hydrodynamics Sediment Transport And El Ni O Induced Seacliff Erosion Along The Coastline Of Central California
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Author : Curt Daron Storlazzi
language : en
Publisher:
Release Date : 2000
Hydrodynamics Sediment Transport And El Ni O Induced Seacliff Erosion Along The Coastline Of Central California written by Curt Daron Storlazzi and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2000 with Beach erosion categories.
Sediment Budget For Monterey Bay
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Author : Emmanuel N. Oradiwe
language : en
Publisher:
Release Date : 1986
Sediment Budget For Monterey Bay written by Emmanuel N. Oradiwe and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1986 with Coast changes categories.
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.
Living With The Changing California Coast
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Author : Gary Bruce Griggs
language : en
Publisher: Univ of California Press
Release Date : 2005-11-07
Living With The Changing California Coast written by Gary Bruce Griggs and has been published by Univ of California Press this book supported file pdf, txt, epub, kindle and other format this book has been release on 2005-11-07 with Nature categories.
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
Between Paradise And Peril
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Author : Gary Griggs
language : en
Publisher:
Release Date : 2018-09-12
Between Paradise And Peril written by Gary Griggs and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2018-09-12 with Nature categories.
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.