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 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 The Southern Monterey Bay Littoral Cell written by Craig E. Dorman and published by . This book was released on 1968 with total page 246 pages. Available in PDF, EPUB and Kindle. Book excerpt: A sediment budget was developed for southern Monterey Bay, California. This budget is based heavily upon sediment information obtained from field and laboratory studies. These studies included a detailed quasi-synoptic areal sampling to determine distribution of textural patterns, and a time-series study of beach and surf-zone sand samples obtained from local sand-mining companies. Results from these studies were combined with data on river discharge, the wind and wave regimes, and shoreline changes during the past century to develop quantitative estimates of sediment gains and losses to the cell. It was determined that the major sources of sediment are the discharge from the Salinas River which empties into the northeast corner of the cell, and erosion of Quaternary seacliffs which form the inner bay shore. Major sinks are the Monterey Submarine Canyon, active coastal dune fields, the mining companies, and the offshore area. The recent history of the sediment regime in the southern bay is reviewed, and a forecast of future nearshore changes is made. Recommendations for further work needed to refine the budget computations are presented. (Author).
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 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 Sand Dune Conservation Management and Restoration written by J. Patrick Doody and published by Springer Science & Business Media. This book was released on 2012-09-18 with total page 316 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book deals with the development of temperate coastal sand dunes and the way these have been influenced by human activity. The different states in which the habitat exists both for the beach/foredune and inland dune are reviewed against the pressures exerted upon them. Options for management are considered and the likely consequences of taking a particular course of action highlighted. These options include traditional approaches to the conservation and management of wildlife and landscapes as well as habitat restoration. The way the value of the areas changes under different management regimes is considered mainly from an environmental perspective. Consideration is given to new approaches to management and restoration including adopting a more dynamic approach. Audience This book will be of interest to academics, students and professionals concerned with policy formulation and /or actively managing coastal areas.
Download or read book Downstream Consequences of Ribb River Damming Lake Tana Basin Ethiopia written by Chalachew Abebe Mulatu and published by CRC Press. This book was released on 2022-02-09 with total page 132 pages. Available in PDF, EPUB and Kindle. Book excerpt: This study assessed the downstream river system adaptation in response to upstream damming on the Ribb River, Ethiopia, to irrigate 15,000 ha. It combined primary and secondary data, and the application of remote sensing and mathematical modeling. The pre-dam morphodynamic trends of the Ribb River were analyzed for 59 years based on aerial photographs, satellite images, and newly collected field data. Three dam operation scenarios were developed to analyze the long-term hydro-morphological effects of the dam on the downstream river reaches. It also assessed the applicability of physics-based analytical equations (Equilibrium Theory) compared to a 1D numerical model (SOBEK-RE) to determine the least-morphologically impactful dam operation scenario on the river reaches downstream of the dam. Moreover, a HEC-RAS 2D hydrodynamic model was developed to assess the effect of the dam on the flooding extent of the Fogera Plain. This was used to study the potential implications of hydrological alteration on the ecology of the floodplain wetlands, as they are the habitats of important fish and bird species. The results contribute to knowledge on the hydro-morphological and environmental impacts of dams on downstream river systems. The developed methodologies and findings may be used to study future hydro-morphological and ecological changes that may arise due to other dam operations or climate change.
Download or read book Space Infrastructures From Risk to Resilience Governance written by U. Tatar and published by IOS Press. This book was released on 2020-04-17 with total page 410 pages. Available in PDF, EPUB and Kindle. Book excerpt: Space-critical infrastructures represent an interdependent system of systems consisting of workforce, environment, facilities, and multidirectional interactions. These are essential for the maintenance of vital societal functions such as health, safety, security, mobility, and the economic and social well-being of people, and their destruction or disruption would have a significant impact on society as a whole. In all, 79 nations and government consortia currently operate satellites, with 11 countries operating 22 launch sites. Despite creating new challenges, this multi-actor environment offers opportunities for international cooperation, but making the most of these opportunities requires a holistic approach to space-critical infrastructure, away from strictly defined space technologies and towards understanding the resilience of complex systems and how they are intertwined in reality. This book presents papers from the NATO Advanced Research Workshop (ARW), entitled Critical Space Infrastructure: From Vulnerabilities and Threats to Resilience, held in Norfolk, Virginia, USA from 21-22 May 2019. The ARW brought together representatives from academia, industry, and international organizations in an effort to deepen scientific and technological understanding of space-critical infrastructures and explore the implications for national and international space security and resilience. It examined space as a critical infrastructure from a multidisciplinary perspective in accordance with NATO’s Strategic Concept. The 29 chapters in the book are divided into six sections covering space infrastructure: governance; cybersecurity; risk, resiliency and complexity; emerging technologies such as block chain, artificial intelligence and quantum computing; application domains; and national approaches and applications.
Download or read book Vanishing Sands written by Orrin H. Pilkey and published by Duke University Press. This book was released on 2022-09-12 with total page 197 pages. Available in PDF, EPUB and Kindle. Book excerpt: In a time of accelerating sea level rise and increasingly intensifying storms, the world’s sandy beaches and dunes have never been more crucial to protecting coastal environments. Yet, in order to meet the demands of large-scale construction projects, sand mining is stripping beaches and dunes, destroying environments, and exploiting labor in the process. The authors of Vanishing Sands track the devastating impact of legal and illegal sand mining over the past twenty years, ranging from Africa, Asia, and the Caribbean to South America and the eastern United States. They show how sand mining has reached crisis levels: beach, dune, and river ecosystems are in danger of being lost forever, while organized crime groups use deadly force to protect their illegal mining operations. Calling for immediate and widespread resistance to sand mining, the authors demonstrate that its cessation is paramount for saving not only beaches, dunes, and associated environments but also lives and tourism economies everywhere.
Download or read book Sandy Beaches as Endangered Ecosystems written by Sílvia C. Gonçalves and published by CRC Press. This book was released on 2022-02-09 with total page 388 pages. Available in PDF, EPUB and Kindle. Book excerpt: Sandy beaches are the most abundant coastal environments worldwide, which have an undeniable and unique ecological value. Presently, they are amongst the most endangered ecosystems in the biosphere, mainly due to the influence of several human activities. In this book, renowned scientists from around the world describe key attributes of sandy beaches and highlight the problems which impact them. Specific tools encompassing the physical environment and the biota are pointed out, at different levels of ecological organization. The book also covers suitable management, conservation programmes and respective actions, where ecologic, economic and social dimensions are comprehensively integrated.
Download or read book Beach Management Tools Concepts Methodologies and Case Studies written by Camilo M. Botero and published by Springer. This book was released on 2017-12-04 with total page 957 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book provides an overview of beach management tools, including carrying capacity, beach nourishment, environmental and tourism awards (like Blue Flag or others), bathing water quality, zoning, beach typologies, quality index, user's perception, interdisciplinary beach monitoring, coastal legislation, shore protection, social and economic indicators, ecosystem services, and coastal governance (applied in beach case studies). Beaches are one of the most intensely used coastal ecosystems and are responsible for more than half of all global tourism revenues, and as such the book introduces a wide range of state-of-the-art tools that can be used to deal with a variety of beach challenges. Each chapter features specific types of tools that can be applied to advantage in beach management practices. With examples of local and regional case studies from around the globe, this is a valuable resource for anyone involved in beach management.
Download or read book A Coast to Explore written by Miles O. Hayes and published by Pandion Books. This book was released on 2010-12-01 with total page 354 pages. Available in PDF, EPUB and Kindle. Book excerpt: From wave-cut rock cliffs and sea caves to gravel beaches and coastal dunes, California’s coastline has enthralled visitors from around the world. A Coast to Explore describes the origins of these coastal features and unravels the wonderful mystery of how the birth of the San Andreas Fault system created what we see today. Miles O. Hayes and Jacqueline Michel have been mapping the coast of California since the 1980s as part of a larger initiative to protect coastlines around the world from hazardous oil spills. A Coast to Explore is the culmination of their work. Through a delightful narrative, it details the geological evolution of central California’s coast from Bodega Bay to Point Conception, including the effects of erosion during El Niños, the impacts of tsunamis, and the formation of spectacular raised marine terraces. Key ecological resources are described for each of the major subdivisions of the coast. Through richly illustrated diagrams, full-color photographs, and satellite images, A Coast to Explore takes readers on a fascinating journey of discovery so they can better understand why the Central California coast is so remarkable.
Download or read book Dune Erosion Mega cusps and Rip Currents written by and published by . This book was released on 2006 with total page 53 pages. Available in PDF, EPUB and Kindle. Book excerpt: Sand dune erosion is highly episodic occurring only when storm waves coincide with high tides generating swash that impacts the toe of the dune. Owing to the episodic nature of sand dune erosion, it is difficult to observe in nature. The removal of a structure and rip-rap sea-wall from the Stilwell Hall site located in southern Monterey Bay provided a unique opportunity to study erosion processes at an accelerated rate. A 1-D wave impact line erosion model (Larson et al., 2004) was tested against data acquired at this site between April, 2004 and April 2005. The model was optimally tuned to the data by a dimensionless coefficient that relates the impact force to the rate of recession. The coefficient values ranged from 0.7-1.3x10-3, for this field data, compared with values of 1.0-2.5x10-3 previously obtained for lab and field data. Migrating rip currents create a system of mega-cusps, which are nominally 10m in width and 200m in alongshore wavelength (Thornton, 2005). The presence of mega- cusps is hypothesized to accelerate sand dune erosion at their embayments where the beach is steeper and narrowest (Short, 1979; Shih and Komar, 1984; Revell, et al., 2002). It was determined that the highest recession occurred at the location of the rip current/mega-cusp embayment. Changes in the surf climate are of great interest to Naval Special Warfare (NSW) and U.S. Marine Corps (USMC) forces tasked with planning and executing operations in littoral areas. Naval history is replete with operations highlighting the importance of understanding and accurate prediction of nearshore dynamics. Without the ability to predict nearshore morphologic processes, providing such support is impossible.
Download or read book Coastal Conservation written by Brooke Maslo and published by Cambridge University Press. This book was released on 2014-03-27 with total page 415 pages. Available in PDF, EPUB and Kindle. Book excerpt: An exploration of the biodiversity status of coastal habitats worldwide, emphasising their importance to society, major threats and conservation challenges.
Download or read book Reconnaissance High resolution Geophysical Survey of the Monterey Bay California Inner Shelf written by John L. Chin and published by . This book was released on 1988 with total page 68 pages. Available in PDF, EPUB and Kindle. Book excerpt:
