Download or read book Modern Sedimentation and Estuarine Shoreline Change Around Roanoke Island North Carolina written by David W. Hawkins and published by . This book was released on 2015 with total page 172 pages. Available in PDF, EPUB and Kindle. Book excerpt: Croatan and Roanoke sounds in North Carolina (NC) are regions constantly undergoing geomorphic changes associated with sea-level rise, storm events, and anthropogenic modification. These estuaries are part of the larger Albemarle-Pamlico Estuarine System (APES), a composite of drowned coastal plain river valleys and large bar-built shallow sounds fronted by the Outer Banks barrier islands. Changes in shoreline morphology driven by erosion and accretion, associated with oceanographic/atmospheric drivers (e.g., wave energy, fetch), influence modern sedimentological patterns and sedimentation rates in the APES. This research focused on the dynamics and controls of modern sedimentary processes (e.g., accumulation) and shoreline change on an anthropogenic time-scale (~100 years) around Roanoke Island, NC. Sedimentological, geochemical, and geospatial analyses provided the necessary information for modern interpretation of the geological processes at work within the past century. Surficial sediment analyses revealed variable grain-size patterns and high loss on ignition (% LOI, organic content proxy) across the region. Sediment accumulation rates (0.12 ± 0.01 cm/y to 0.37 ± 0.04 cm/y) varied over the long-term, and one location (DH-S17) displayed rapid episodic deposition (2.3 ± 0.5 cm/month). Long-term shoreline change (1915-2012) indicated net erosion of the system (-0.68 ± 0.05 m/y), with temporal changes observed in the intermediate time-intervals, and more accretion was captured in the recent- and short-term (2007-2012: -0.24 ± 0.32 m/y). Long-term shoreline change rates (SCRs) provided insight into chronic changes (hydrodynamic and geomorphic changes), while short-term rates, due to events (e.g., hurricanes), revealed episodic variations in accretion and erosion that might not represent the long-term patterns in the system. Overall, the amount of sediment eroded from the shoreline over the 97-year interval (1915-2012) was calculated to be 8.32 x 106 m3, with a mass of 4.16 x 109-8.32 x 109 kg (assuming a dry bulk density range of 0.5-1.0 g/cm3). A sediment accumulation budget of 9.32 x 103 m3/y (7.24 x 106 kg/y) was calculated for two regions (offshore UNC CSI, Shallowbag Bay), and modern accumulation accounts for ~11% (8.57 x 104 m3/y) of the amount of annually eroded sediment. Data from this thesis indicate that the majority of eroded sediment is exported out of Croatan and Roanoke sounds. Spatial and temporal trends in shoreline change and accompanying sedimentary characteristics examined in this thesis provide insight to coastal managers and homeowners in systems similar to the Roanoke Island area.

Download or read book Analyzing Estuarine Shoreline Change in Coastal North Carolina written by Lisa Cowart and published by . This book was released on 2009 with total page 95 pages. Available in PDF, EPUB and Kindle. Book excerpt: With continued climate change, sea-level rise, and coastal development, concern about shoreline dynamics has expanded beyond oceanfront areas to encompass more protected coastal water bodies, such as estuaries. Because estuaries are critically important ecosystems, understanding coastline changes in these areas is necessary for evaluating resource risks. Throughout the recent decades various methods have been developed to calculate shoreline change and multiple parameters have been hypothesized to correlate with estuarine erosion, including fetch, wave energy, elevation, and vegetation. A transect-based approach is commonly used to quantify shoreline change on linear (i.e., ocean) shorelines; however, due to the complex morphology of the estuarine environments, a point-based approach was developed and applied in this study. Shoreline-change rates and additional parameters (i.e., wave energy and shoreline composition) were determined using 1958 and 1998 aerial photography and available datasets. From these data the average shoreline change of Cedar Island, NC is determined to be -0.24 m yr−1, with 88% of the shoreline eroding. Of the parameters analyzed, shoreline composition appears to have an important control on shoreline erosion along Cedar Island, whereas wave energy is not significantly correlated with shoreline-change rates. The point-based approach was applied to the trunk of the Neuse River Estuary to analyze parameters associated with estuarine erosion at two contrasting scales, regional (whole estuary) and local (estuary partitioned into 8 sections, based on orientation and exposure). With a mean shoreline-change rate of -0.58 m yr−1, the majority (93%) of the Neuse River Estuary study area is eroding. Although linear regression analysis at the regional scale did not find significant correlations between shoreline change and the parameters analyzed, trends were determined at the local scale. Local-scale analysis determined higher erosion rates, higher elevation, and lower exposure and fetch up-estuary. Erosion rates, fetch, and wave exposure increase, while elevation decreases moving eastward, down-estuary. The general trends found at the local scale highlight the importance of the spatial distribution on shoreline-change rates and parameters analyzed within a complex estuarine system, like the Neuse River Estuary. Linear regression analysis between mean fetch and mean shoreline-change rates at the Local Scale determined an equation to predict shoreline-change rates. Predicted shoreline-change rates overestimate erosion on extremely high fetch shorelines and underestimate erosion on shorelines classified as sediment bank. Overall, the model is conservative in predicting shoreline-change rates by underestimating erosion and accretion within the Neuse River Estuary. Further analysis of mean fetch by specific vegetation type may offer additional insight into the influencing forces on estuarine shoreline change.

Download or read book Shoreline Change Within the Albemarle Pamlico Estuarine System North Carolina written by and published by . This book was released on 2008 with total page 10 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Holocene Evolution of a Nanotidal Brackish Marsh written by Stephen Boyd Benton and published by . This book was released on 1979 with total page 352 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Estuarine Shoreline Erosion in the Albemarle Pamlico Region of North Carolina written by Vincent J. Bellis and published by . This book was released on 1975 with total page 84 pages. Available in PDF, EPUB and Kindle. Book excerpt: Tracings: 92.38.

Download or read book Historical Shoreline Changes and Modern Sediment Transport Bogue Inlet to New River Inlet North Carolina written by Linda S. Shope and published by . This book was released on 1980 with total page 378 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Estuarine Shoreline Erosion in North Carolina written by Stanley R. Riggs and published by . This book was released on 2003 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book The Battle for North Carolina s Coast written by Stanley R. Riggs and published by UNC Press Books. This book was released on 2011-09-05 with total page 161 pages. Available in PDF, EPUB and Kindle. Book excerpt: The North Carolina barrier islands, a 325-mile-long string of narrow sand islands that forms the coast of North Carolina, are one of the most beloved areas to live and visit in the United States. However, extensive barrier island segments and their associated wetlands are in jeopardy. In The Battle for North Carolina's Coast, four experts on coastal dynamics examine issues that threaten this national treasure. According to the authors, the North Carolina barrier islands are not permanent. Rather, they are highly mobile piles of sand that are impacted by sea-level rise and major storms and hurricanes. Our present development and management policies for these changing islands are in direct conflict with their natural dynamics. Revealing the urgency of the environmental and economic problems facing coastal North Carolina, this essential book offers a hopeful vision for the coast's future if we are willing to adapt to the barriers' ongoing and natural processes. This will require a radical change in our thinking about development and new approaches to the way we visit and use the coast. Ultimately, we cannot afford to lose these unique and valuable islands of opportunity. This book is an urgent call to protect our coastal resources and preserve our coastal economy.

Download or read book Selected Water Resources Abstracts written by and published by . This book was released on 1991 with total page 962 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Relative Estuarine Shoreline Erosion Potential in North Carolina written by Michael Peter O'Connor and published by . This book was released on 1978* with total page 2 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Shoreline Movements written by Craig Hamilton Everts and published by . This book was released on 1983 with total page 128 pages. Available in PDF, EPUB and Kindle. Book excerpt: Shoreline position changes between about 1850 and 1980 along the ocean coastal reach from 12 km west of Cape Henry, Virginia, to 8 km west of Cape Hatteras, North Carolina, are documented in this report. In places where the ocean shoreline is on an island or spit, shoreline changes in the sound or bay are also given. Shoreline movement maps at a scale of 1:24,000 constitute the basic data set included in the report. Composite reproductions of these maps are shrinkwrapped separately. In addition, ocean and sound shoreline changes averaged for 1-minute-latitude- (or longitude- ) distance increments are provided. Consistent alongshore trends in the shoreline change rate are evident only from Virginia Beach south to the Virginia-North Carolina border and for about 15 km north of Cape Hatteras. Other areas experienced variable rates of shoreline change. The highest average shoreline change rate, about -2.0 m/year, occurred between 1917 and 1949. From about 1850 to 1917, the shoreline change rate averaged -0.1 m/year, and for the past 30 years it has averaged about -0.8 m/year. (Author).

Download or read book Decadal scale Evolution of a Barrier Island written by Ian W. Conery and published by . This book was released on 2014 with total page 64 pages. Available in PDF, EPUB and Kindle. Book excerpt: Eastern North Carolina has over 300 km of barrier islands that comprise the Outer Banks and act as an important buffer from the Atlantic Ocean and boundary to the Albemarle-Pamlico Estuarine System. These islands also draw millions of visitors and dollars to the state every year. With sea-level rise and the persistence of extratropical and tropical storms, it is critical to examine the recent decadal response to storm events and geologic evolution in order to best prepare for future change. In this study, multiple methods were used to evaluate the recent decadal evolution of Ocracoke Island, NC. Shoreline change rates were calculated using a transect-based approach with imagery from 1949, 1974 and 2006. Other aerial imagery time steps were used to look at the spatial impact of historic storms and to select coring and trenching sites based on visible depositional history. The stratigraphic and sedimentological signature of recent and historic storm events was interpreted using seven vibracores and 32 trench excavations. Additionally, LiDAR data was used to assess morphologic change and to test a storm-impact scale based on storm surge, waves and maximum foredune height. The average long-term shoreline change rate for all of Ocracoke Island was determined to be - 0.54 m/yr. The majority of the island has been eroding (over 65% of transects), and the average erosion rate was greatest in the most recent period analyzed (1974-2006). The shoreline change rates highlight the narrowing of the island through time. In some regions island width has decreased by as much as 70% (180 m). Hurricane Isabel (2003) overwashed a total of 9% of the island area with an average thickness of 0.24 m. The storm-impact scale showed a quantitative relationship between overwash and pre-existing dune conditions along the coast. Sedimentation from Isabel represented up to 26% of total backbarrier subaerial volume and was comparable to dune volume loss. Isabel caused up to 40 m of sound-directed migration of the foredune and substantial oceanside erosion, representing more than 20% of long-term net change in some regions of the island. Four other distinct storm deposits were interpreted within the cores based on the sedimentological signatures of moderately to well-sorted fine to medium grained sand, coarse shell hash bases, and heavy mineral laminae. However, few cores had multiple deposits, indicating stacked overwash deposits are spatially and temporally variable. This collection of results shows the complexity of barrier island evolution and the necessity to examine soundward migration in three dimensions.

Download or read book North Carolina Estuarine Shoreline Mapping Project written by Kevin McVerry and published by . This book was released on 2012 with total page 145 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Using Modern Photogrammetric Techniques to Map Historical Shorelines and Analyze Shoreline Change Rates written by Jason Michael Zink and published by . This book was released on 2002 with total page 90 pages. Available in PDF, EPUB and Kindle. Book excerpt: Keywords: shoreline, aerial photography, GIS, erosion rates.

Download or read book Drowning the North Carolina Coast written by Stanley R. Riggs and published by . This book was released on 2003 with total page 152 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Quaternary Coasts of the United States written by Charles H. Fletcher and published by . This book was released on 1992 with total page 474 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book The Non steady State of the Inner Shelf and Shoreline written by and published by . This book was released on 1999 with total page 254 pages. Available in PDF, EPUB and Kindle. Book excerpt: