2 edition of application of beach and dune erosion models to the high-energy Oregon Coast found in the catalog.
application of beach and dune erosion models to the high-energy Oregon Coast
Paul D. Komar
|Statement||Paul D. Komar, Donald Carpenter and William G. McDougal.|
|Contributions||Carpenter, Donald., McDougal, W. G., Oregon. Dept. of Land Conservation and Development.|
|The Physical Object|
|Pagination||28 leaves :|
|Number of Pages||28|
Sand dunes are common features of shoreline and desert environments. Dunes provide habitat for highly specialized plants and animals, including rare and endangered can protect beaches from erosion and recruit sand to eroded beaches. Dunes are threatened by human activity, both intentional and unintentional. Erosion of Connecticut’s Beaches and Dunes Beaches and dunes are dynamic coastal features and are affected by short and long term changes in waves, wind, tides, storm surge, sand availability and sea level rise. These changes may be seasonal, episodic or storm-related, or slow, barely noticeable.
This type of coastal erosion management has been adopted all over the world in order to preserve and protect. An example of this is at Mount Maunganui beach in the North Island of New Zealand which had been experiencing erosion, resulting in coastal dune retreat of almost 20 m. When ongoing dredging at the entrance to the Tauranga Harbour began. Many beaches along the Pacific Northwest coast have experienced increased erosion since the late s. So says the U.S. Geological Survey, which is working with Oregon .
The erosion models include a geometric model, an equilibrium profile model, and a wave impact model. We discuss the assumptions required to implement each model and force them with hydrodynamic conditions associated with a large-scale laboratory dune erosion experiment and a major winter storm approximately equivalent to the yr return period. Methodologies have been developed to establish setback distances for use on the coast of the Pacific Northwest where the principal hazards are wave runup and surge during major storms, and El Ninos that produce unusually high tides and the northward movement of beach sand within littoral cells, creating "hot spot" erosion sites.
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Coastal erosion is a natural process that continually affects the Oregon coast. Erosion becomes a hazard when human development or public safety is threatened.
Beaches, sand spits, dunes, and bluffs are constantly affected by waves, currents, tides, and storms, resulting in chronic erosion, landslides, and flooding.
Morphologies of Beaches and Dunes on the Oregon Coast, with Tests of the Geometric Dune-Erosion Model the ORegOn cOast: setting and eROsiOn pROcesses There are advantages in undertaking the tests of the geometric dune-erosion model on the Oregon coast.
It represents a high energy environment, with winter. Swash Oscillations on Dissipative Beaches Implications for Beach Erosion," (). The Application of Beach and Dune Erosion Models to the High-Energy Oregon Coast," Report to the Oregon Department of Land Conservation and Development.
verify dune erosion models for specific application to the U.S west coast. However, since there rectangular concrete channel, and was filled with m3 of natural beach sand from the Oregon. Mull and Ruggiero - REVISED Dune Erosion and Overtopping 8 coast with a median grain size of mm.
The Froude-scaled physical model study ( Three scenarios were used to model erosion hazard zones on dune-backed beaches: o Scenario 1 (HIGH risk). Although the application here is to the Oregon coast, the model can be used on other. The beach erosion caused by storm waves has been simulated with the XBeach model (Roelvink et al., ).
XBeach is an open-source numerical model developed to simulate morphodynamic processes caused by high-energy wave conditions. The model solves phase-averaged coupled equations for cross-shore and longshore hydro and morphodynamics.
3 by Hmax=br h with br= breaking coefficient and h=local water lly, the measured H1/3-wave heights are reasonably well represented by the model in all zones from deep water to the shallow surf zone.
The application of a numerical cross-shore profile model to compute the erosion of the beach and duneface. Oregon coast were used to build the beach profile w predicting beach and dune erosion has improved in the last three decades, but the recovery of an eroded beach above the mean sea level (MSL.
The impact of wind erosion is Dune grading along the Oregon coast, USA KarS F.\ordsirom considered minor according to the state study because the plan requires use of vegetation to stabilize newly created bare areas (State of Oregon ).
The state plan recognizes the important role of vegetation in determining the form of the dune. Beach and Dune Erosion Tests Numerical Model for Dune Erosion Due to Wave Uprush. Coastal Engineering December Large Scale Laboratory Tests of Dune Erosion. Coastal Engineering December Show more Show less Authors.
van der Meulen. Delft Hydraulics Laboratory, Netherlands. CORVALLIS, Ore. - A new assessment of shoreline change along the Pacific Northwest coast from the late s to present found that while the majority of beaches are stable or slightly accreting (adding sand), many Oregon beaches have experienced an increase in erosion hazards in recent decades.
Since the s, 13 of the 17 beach "littoral cells" - stretches of beach between. Department of Geology, University of Oregon Sand dunes that have formed since the end of the Ice Age, or within the last thousand years, occupy approximately of Oregon's miles of coast.
Dune areas vary in size from sma II patches a few hundred feet across to stretches tens of mi les long. ocean flooding, beach and dune erosion, dune accretion, bluff recession, land sliding, and inlet migration; (b) assessing the potential risks to life and property posed by chronic coastal natural hazards, including erosion and earth movement; and (c) minimizing potential public and private risks and losses to life and property due to.
Oregon Coast March Lecture Addresses Erosion of Beachfront Communities - March 7 is the World of Haystack Rock Library Lecture Series: Living on the Edge: Adapting to coastal erosion and shoreline.
A sand beach of mm diameter was constructed over 76 m of the tank, utilizing approximately metric tons of beach sand trucked in from the Oregon coast. The instrumentation in the tank included wave gages, current meters, pressure gauges, video cameras, and sediment concentration gauges to measure the hydrodynamics, and beach and dune.
Application of Existing Guidelines to Topic – History and/or Implications for EBEACH time-dependant, two-dimensional beach and dune erosion model ERDC Engineer Research and Development Center Coast Non-Open Coast 31 Bluff Erosion - AC/GC/(PC) Add/revise G&S language regarding bluff erosion.
Existing coastal change hazard zones in Oregon (e.g., Allan and Priest ) were developed deterministically with an event-selection approach that includes an assessment of the TWL and the application of a simple geometric dune erosion model (Komar et al.
hereafter K99). We extend this work with a probabilistic treatment to evaluate the. include cases of beach erosion, wave overtopping, innundation, and equilibrium beaches with longshore transport.
Recently, the model has been applied to natural beaches and storm conditions to determine the generality of the model formulation (Johnson et al., in press). Although the CSHORE model has a defensible physical basis, dependence on.
Coastal Processes and Beach Erosion Maine Geological Survey Response to Storms On the left is a diagram showing how a beach and dune system responds to a storm.
The top image is of the beach during normal conditions. The 2nd image shows a storm occurring with an increase in water level and waves attacking the dune. Dune Erosion Along the Panhandle Coast of Florida” (FL Bureau of Beaches and Coastal Systems, ). The executive summary presents a brief overview of the beach and dune 12 Beach and dune erosion from Opal at R in Escambia County 13 13 Beach and dune erosion from Opal at R in Escambia County.
Application of beach and dune erosion models to the high-energy Oregon Coast Appraisal of chronic hazard alleviation techniques, with special reference to the Oregon coast .changes in beach width due to changes in wave direction.
Six common beach settings representative of those along the California, Oregon, and Washington coastlines are addressed in these guidelines: 1. Sandy beach backed by a low sand berm or high sand dune formation 2. Sandy beach backed by shore protection structures 3.A probabilistic model has been developed to analyze the susceptibilities of coastal properties to wave attack.
Using an empirical model for wave runup, long term data of measured tides and waves are combined with beach morphology characteristics to determine the frequency of occurrence of sea cliff and dune erosion along the Oregon coast.