Download or read book Historical Shoreline Changes in Response to Environmental Conditions in West Delaware Bay written by Gregory T. French and published by . This book was released on 1990 with total page 480 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Pitfalls of Shoreline Stabilization written by J. Andrew G. Cooper and published by Springer Science & Business Media. This book was released on 2012-06-05 with total page 340 pages. Available in PDF, EPUB and Kindle. Book excerpt: At the coast all is not what it seems. Decades of beachfront development have seen a variety of efforts to stabilize the shoreline to protect ill-placed beachfront property, both from shoreline erosion and from storm damage. Both of these problems become increasingly critical in a time of rising sea level. Many natural beaches are backed by sea walls, while others have been transformed by whole series of groynes, offshore breakwaters and a plethora of other schemes. Many recreational beaches are actually artificial replicas of the real thing, emplaced to protect badly placed infrastructure and maintained only through ongoing costly beach nourishment. However, all of these attempts to stabilize the shoreline are far from benign. Degradation and even complete loss of the all important recreational beach sometimes results from seawall emplacement. Increasingly, the choice of shoreline stabilization approach will depend upon plans for future response to rising seas which in many cases may involve retreat from the shoreline rather than holding the line. This book explores, through a series of case studies from around the globe, the pitfalls of shoreline stabilization and provides a ready reference for those with an interest in shoreline management. It is particularly timely in a time of global change.
Download or read book Seafloor Geomorphology as Benthic Habitat written by Peter T Harris and published by Elsevier. This book was released on 2019-11-05 with total page 1076 pages. Available in PDF, EPUB and Kindle. Book excerpt: Seafloor Geomorphology as Benthic Habitat: GeoHab Atlas of Seafloor Geomorphic Features and Benthic Habitats, Second Edition, provides an updated synthesis of seabed geomorphology and benthic habitats. This new edition includes new case studies from all geographic areas and habitats that were not included in the previous edition, including the Arctic, Asia, Africa and South America. Using multibeam sonar, the benthic ecology of submarine features, such as fjords, sand banks, coral reefs, seamounts, canyons, mud volcanoes and spreading ridges is revealed in unprecedented detail. This timely release offers new understanding for researchers in Marine Biodiversity, environmental managers, ecologists, and more. Explores the relationships between seabed geomorphology, oceanography and biology Provides global case studies which directly focus on habitats, including both biological and physical data Describes ways to detect change in the marine environment (change in the condition of benthic habitats), a critical aspect for judging the performance of policies and legislation
Download or read book Broadkill Beach DE Interim Feasibility Study written by and published by . This book was released on 1996 with total page 1134 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Delaware River Main Channel Deepening NJ DE PA D Amendment written by and published by . This book was released on 1997 with total page 818 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Patterns and Rates of Historical Shoreline Change in the Delaware Estuary written by Katherine Pijanowski and published by . This book was released on 2016 with total page 97 pages. Available in PDF, EPUB and Kindle. Book excerpt: Shoreline change in coastal and estuarine systems is a result of both natural and anthropogenic factors that influence sediment accumulation and erosion within the intertidal zone. The Delaware River and Bay estuary, a 215-km long coastal plain estuary on the U.S. Atlantic coast, is a submerging estuarine basin consisting of a tidal freshwater river (upper estuary), a stratified estuary (lower estuary), and a weakly stratified bay (Delaware Bay) at its mouth. Beginning in the late Holocene and continuing to present, marine transgression has caused the bay and estuary to broaden, its shores to retreat landward and upward, and its coastal environments to transition from tidal wetlands and tidal flats to sandy, barrier beaches. Superimposed on this natural change are anthropogenic influences on estuarine sedimentation, beginning in the 19th Century, such as construction of a shipping channel, maintenance dredging, shoreline hardening, and modification of tidal wetlands. Although previous research has shown that much of the estuary shoreline is retreating because of transgressive erosion, the nature of shoreline change in the estuary-bay as a whole has never been established. In this study, patterns and rates of shoreline change in the estuary from 1879 to 2012 were characterized using five shoreline datasets (1879, 1948, 1991, 2007, 2012) and the USGS Digital Shoreline Analysis System (DSAS) extension for ArcGIS. Linear rates of shoreline change were computed using both linear regression and endpoint methods to investigate temporal variations in shoreline extension and retreat. Volumetric rates of shoreline change where determined using DSAS and sediment bulk density data, to estimate the mass of sediment associated with shore erosion and accretion. Given that wind waves are a known agent of coastal change in the estuary, archived wave data (2007?2015) were examined to identify potential relationships between wave parameters (significant wave height, wave period, wave power) and rates of shoreline retreat. Results indicate that coasts of the lower estuary-bay have been in a state of net retreat during historical times. From 1879 to 2012 the long-term rate of shoreline change for the entire lower estuary?bay was -1.1 ± 0.13 m/yr. This rate of retreat equates to -1.5 ± 0.18 x108 kg/yr, assuming retreat is due to erosion of the shoreface. By comparison, the short-term (2007?2012) rate of shoreline retreat for the lower estuary?bay system was higher at -2.13 ± 0.47 m/yr. Long-term rates of shoreline change for the lower estuary region alone were -0.64 ± 0.13 m/yr and -1.3 ± 0.13 m/yr on the Delaware and New Jersey sides, respectively. In the bay region long-term rates on the Delaware and New Jersey sides were respectively -0.73 ± 0.13 m/yr and -1.7± 0.13 m/yr. Among the four different types of coasts classified for this study (barrier beach, tidal wetland, transitional wetland-barrier, and hardened), transitional and wetland coasts had higher rates of shoreline retreat than the barrier beaches. In sum, both long-term and short-term rates of shoreline retreat are higher on the New Jersey side of the lower estuary-bay. Comparison of modeled wave properties and shoreline change data indicates a general correlation between wave power and shoreline retreat, presumably due to wave erosion of the shoreface. However, further research is needed to identify the actual mechanisms and time-dependence of shoreface erosion. By documenting historical shoreline change in the estuary, the findings of this study can help identify vulnerabilities associated with sea-level rise, climate variability, and human pressures.
Download or read book Salt Marshes written by Duncan M. FitzGerald and published by Cambridge University Press. This book was released on 2021-04-22 with total page 499 pages. Available in PDF, EPUB and Kindle. Book excerpt: A multidisciplinary review of salt marshes, describing how they function and respond to external pressures such as sea-level rise.
Download or read book Proposed Coastal Management Program for the State of Delaware written by National Ocean Survey. Office of Coastal Zone Management and published by . This book was released on 1979 with total page 576 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Sea Level Change in the Delaware Bay and Its Impacts on Fetch Limited Barrier Islands written by Anna S. Jaworski and published by . This book was released on 2016 with total page 280 pages. Available in PDF, EPUB and Kindle. Book excerpt: In this dissertation I studied historical changes in the Delaware Bay along the New Jersey coastline to improve our understanding of the region as well as better understand how the area will respond to rising seas. The shallow sloping, low elevation shoreline of the Delaware Bay makes it especially vulnerable to sea-level rise. The New Jersey coastline along the Delaware Bay consists of coastal communities, wetlands, sandy beaches, and fetch-limited barrier islands at risk as sea-level rises and shorelines erode. Using dendrochronology and 14C dating of peat deposits I created two sea level curves for the area. Using the 14C curve I found a historical rate of sea level change of 1.5 mm/yr for the last 3000 years. The dendrochronological sea level curve shows a rate of 8.9 mm/yr for the last 57 years. As sea level has risen over the last 130 years, the shoreline has eroded at an average rate of 1.67 m/yr. The wetland shorelines are eroding faster than the regional average at a rate of 4.1 m/yr. As the rate of sea level rise accelerates, so does the rate of shoreline erosion. During the most recent time period, 1970-2013, the average rate of shoreline erosion has increased to 2.64 m/yr for the whole region and 6.12 m/yr for the wetland shorelines. In addition, I sought to better understand the fetch-limited barrier islands in the region. The barrier islands are composed of well sorted, medium and coarse grained sand, which becomes coarser and poorly sorted longshore from north to south. The barrier islands are becoming more fragmented as they migrate landward, but overall sand area has remained stable since the 1970s. Understanding how the system is responding to sea-level rise is critical for helping resource managers' plan for the future of this critical tidal ecosystem.
Download or read book Organizing for the Coast written by Coastal Society. Conference and published by . This book was released on 1994 with total page 840 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The influence of geological structure and historical changes in morphology of Delaware Bay communities on environmental planning written by Kathleen Susan Drew and published by . This book was released on 1981 with total page 372 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Guide to Graduate Departments of Geography in the United States and Canada written by and published by . This book was released on 1991 with total page 906 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Guide to Programs of Geography in the United States and Canada written by and published by . This book was released on 1991 with total page 912 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Treatise on Geomorphology written by and published by Academic Press. This book was released on 2013-02-27 with total page 6392 pages. Available in PDF, EPUB and Kindle. Book excerpt: The changing focus and approach of geomorphic research suggests that the time is opportune for a summary of the state of discipline. The number of peer-reviewed papers published in geomorphic journals has grown steadily for more than two decades and, more importantly, the diversity of authors with respect to geographic location and disciplinary background (geography, geology, ecology, civil engineering, computer science, geographic information science, and others) has expanded dramatically. As more good minds are drawn to geomorphology, and the breadth of the peer-reviewed literature grows, an effective summary of contemporary geomorphic knowledge becomes increasingly difficult. The fourteen volumes of this Treatise on Geomorphology will provide an important reference for users from undergraduate students looking for term paper topics, to graduate students starting a literature review for their thesis work, and professionals seeking a concise summary of a particular topic. Information on the historical development of diverse topics within geomorphology provides context for ongoing research; discussion of research strategies, equipment, and field methods, laboratory experiments, and numerical simulations reflect the multiple approaches to understanding Earth’s surfaces; and summaries of outstanding research questions highlight future challenges and suggest productive new avenues for research. Our future ability to adapt to geomorphic changes in the critical zone very much hinges upon how well landform scientists comprehend the dynamics of Earth’s diverse surfaces. This Treatise on Geomorphology provides a useful synthesis of the state of the discipline, as well as highlighting productive research directions, that Educators and students/researchers will find useful. Geomorphology has advanced greatly in the last 10 years to become a very interdisciplinary field. Undergraduate students looking for term paper topics, to graduate students starting a literature review for their thesis work, and professionals seeking a concise summary of a particular topic will find the answers they need in this broad reference work which has been designed and written to accommodate their diverse backgrounds and levels of understanding Editor-in-Chief, Prof. J. F. Shroder of the University of Nebraska at Omaha, is past president of the QG&G section of the Geological Society of America and present Trustee of the GSA Foundation, while being well respected in the geomorphology research community and having won numerous awards in the field. A host of noted international geomorphologists have contributed state-of-the-art chapters to the work. Readers can be guaranteed that every chapter in this extensive work has been critically reviewed for consistency and accuracy by the World expert Volume Editors and by the Editor-in-Chief himself No other reference work exists in the area of Geomorphology that offers the breadth and depth of information contained in this 14-volume masterpiece. From the foundations and history of geomorphology through to geomorphological innovations and computer modelling, and the past and future states of landform science, no "stone" has been left unturned!
Download or read book Sea Grant Publications Index written by and published by . This book was released on 1977 with total page 626 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Sea Grant Publications Index 1968 72 written by and published by . This book was released on 1973 with total page 348 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Tidal Range Changes in the Delaware Bay written by George F. Hall and published by . This book was released on 2012 with total page 95 pages. Available in PDF, EPUB and Kindle. Book excerpt: Throughout the Holocene, appreciable changes in bathymetry are hypothesized to have resulted in large changes to tidal datums in coastal and estuarine areas. An understanding of tidal change is an important contribution to the knowledge of relative historical sea-level change and future coastal planning. To test this hypothesis, the Advanced Circulation (ADCIRC) model was used, with representative bathymetric grids based on glacial isostatic adjustment models and semi-empirical sea level rise predictions, in order to model the time-varying tidal behavior of the Delaware Bay. Model runs were conducted at various time slices between 10,000 years before present and 300 years into the future on high resolution grids that allowed for inundation moving forward in time. Open boundary tidal forcing was held constant in time to highlight the effect of the changing regional bathymetry. With each change in sea level, the shape of the Delaware Bay was considerably altered, leading to changes in the tides. Resonance and shallow water dissipation appeared to be the primary mechanisms behind these changes. Results showed that tidal ranges have nearly doubled in the upper Delaware Bay over the past 3000 years, while decreasing in the lower bay by 8%. Tidal range change represents a possible correction to past sea level rise estimates from the geologic record. Scenarios incorporating future sea level predictions primarily showed a small decrease in tidal range, potentially impacting future water levels and tidal sediment transport. Trends modeled were consistent with field measurements of relative change over similar time periods.
