Download or read book Delaware s Changing Shoreline Kent County and Northeast Sussex County written by Delaware. State Planning Office and published by . This book was released on 1976 with total page 52 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Delaware s Changing Shoreline written by Delaware. State Planning Office and published by . This book was released on 1976 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Delaware s Changing Shoreline written by John C. Kraft and published by . This book was released on 1975 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Tracings: 94.60, 99.28.

Download or read book Delaware s Changing Shoreline written by and published by . This book was released on 1976 with total page 346 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 Simulations of Shoreline Changes Along the Delaware Coast written by Yan Ding and published by . This book was released on 2021 with total page 42 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Spatial Variability in Shoreline Change Along the Atlantic Coast of Delaware written by Maria Grace Honeycutt and published by . This book was released on 2003 with total page 394 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 A Case Study written by and published by . This book was released on 2009 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The 1962 Northeaster, called by many "The Storm of the Century," was one of Delaware's most devastating coastal storms. It lasted over more than five consecutive, semi-diurnal, perigean spring tidal cycles (Zhang et al., 2002). Maximum winds reached 112.7 km/hr (70 miles/hr), waves were an average of 6-9 m (20-30 ft), and the storm surge reached 2.9 m (10 ft) (Carey & Dalrymple, 2003). Overwash from beaches brought greater than 1.2 m (4 ft) of sand onto the streets, homes, and buildings of communities along the Delaware coastline (Podufaly, 1962). This thesis presents a case study of the impact of the 1962 Northeaster on Delaware's Atlantic Coast shoreline. The destructive nature of the storm is quantified using historical aerial photographs, shoreline change data, and Light Detection and Ranging (LiDAR) digital elevation maps. The potential impact of a future storm of this magnitude occurring along Delaware's modern shoreline is briefly discussed. Within a Geographic Information System (GIS) framework, georeferenced historic aerial photographs were analyzed for changes in shoreline position, aerial extent of overwash, and number and areas of extensive building damage caused by the storm. For these analyses, the Delaware Atlantic Coastshoreline between Cape Henlopen to the Delaware-Maryland was divided into twelve zones, each approximately 3.7 km (2.3 mi) in length. To quantify erosion due to the storm, the landward displacement of the Delaware shoreline between 1960 (pre-storm) and 1962 (post-storm) was measured at 500 m (1,640 ft) intervals along its length and the maximum amount of landward displacement within each of the zones was determined. The maximum amount of erosion as a result of the storm was 150 m (490 ft) in the zone located within the Delaware Seashore State Park, just north of the Indian River Inlet. Significant amounts (100-130 m (330-430 ft)) of shoreline erosion occurred in the northern portion of Delaware Seashore State Park and near South Bethany and Fenwick Island. The zones with the greatest amounts of maximum erosion as a result of the 1962 Northeaster coincide with the areas of significant longer-term erosion identified by Honeycutt (2003). Areas of overwash due to the storm were digitized on the 1962 post-storm aerial photographs. The total extent of overwash in the study area was 8.34 km2 (3.2 mi2) with the most visibly pronounced areas along the bay barrier portion of the shoreline south of Dewey Beach, Delaware. Maximum and minimum lateral (landward) displacement of overwash sand was measured for each zone. The maximum amount of lateral displacement, ~650 m (2150 ft), was found to be located just south of Bush Island in Delaware Seashore State Park. The least amount of lateral overwash, ~45 m (150 ft), occurred near Rehoboth Beach. Buildings present in the 1960, 1962, and 2002 aerial photographs were digitized as GIS point shapefiles. The 1962 post-storm aerial photographs indicated that the destruction of buildings was highly correlative to the areas of overwash from the storm. As shown by the 2002 aerial photographs, a great deal of residential development took place along the Delaware Atlantic shoreline. For example, in the area of Bethany Beach the increase in structures was as high as 812%. In order to assess the potential effects of another storm of this magnitude on the modern coastline, elevation maps based on LiDAR were used to show areas most at risk due to a 2.9 m (10 ft) storm surge, equivalent to that determined for the 1962 storm. As with the 1962 Northeaster, these high risk areas include the vast majority of the coastline. The effect of 6-9 m (20-30 ft) wave heights, similar to that observed during the 1962 storm, on top of the storm surge was also considered. For example in the areas of greatest development near Bethany Beach, where major overwash and flooding occurred during the 1962 storm, it would be predicted that large-scale erosion of the dune barrier systems with subsequent overwash could occur followed by flooding with levels of inundation approaching 12 m (36 ft). Although modern building codes are much improved from 1962, one could still expect that a future coastal storm of the magnitude of the 1962 Northeaster would have significant impact on Delaware's coastal communities.

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 Delaware Shoreline Plan written by Delaware. State Planning Office and published by . This book was released on 1966 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Seasonal and Yearly Profile Changes of Delaware Beaches written by Jens Figlus and published by . This book was released on 2007 with total page 198 pages. Available in PDF, EPUB and Kindle. Book excerpt: In this study measured data from densely spaced semi-yearly profile surveys of the beaches at North Shore, Rehoboth, Dewey and Bethany is analyzed and processed to yield seasonal and yearly erosion and accretion patterns. The correlations between profile change parameters are used to highlight the shortcomings of simple one-line models in predicting Delaware beach evolution.

Download or read book Delaware Coast from Cape Henlopen to Fenwick Island Rehoboth Beach Dewey Beach Interim Feasibility Study written by and published by . This book was released on 1996 with total page 326 pages. Available in PDF, EPUB and Kindle. Book excerpt:

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 Delaware Coastal Zone Management Program written by and published by . This book was released on 1979 with total page 668 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Selected Water Resources Abstracts written by and published by . This book was released on 1977 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Historical Coastline Changes of Cape Henlopen Delaware written by Kelvin W. Ramsey and published by . This book was released on 2001 with total page 1 pages. Available in PDF, EPUB and Kindle. Book excerpt: