Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 27 for “"Runup"”.
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Bed shear stress under wave runup on steep slopes
… The leading edge of the shoreline during wave runup was found to follow a parabolic trajectory, but only complete collapse of the incident wave. This suggests that the Shen and Meyer (1963) model is valid for all swash types, and not just for well-developed bores. Collapsing and surging swashes …
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Impact of Patchy Vegetation on Wave and Runup Dynamics
… the impact of patchy vegetation on wave and runup dynamics along coastlines. Selecting from a prototype in Dalehite Cove, Galveston Bay, TX, results from a Boussinesq model (COULWAVE) showed patchy vegetation reduced up to 75% mean shoreward current in the mound-channel wetland systems. These …
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Catastrophic Landscape Modification from Massive Landslide Tsunamis: An Example from Taan Fiord, Alaska
… 2015 Taan landslide and tsunami generated a high runup of 192 m, nearly an order of magnitude greater than most previously surveyed tsunamis. Extensive modifications observed and documented on several low gradient fan deltas within the fiord make Taan Fiord an excellent laboratory for …
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Field Observations and Modeling of the 1957 Earthquake and Tsunami on the Islands of the Four Mountains, Aleutian Islands, Alaska
… trans-Pacific tsunamis. Comparison of simulated runup and observed runup will help to determine the characteristics of rupture in the eastern Aleutians. A recent survey of the tsunami wrackline produced by the 1957 Great Aleutian earthquake (M<sub>w</sub> 8.6) indicates runup up to 17.5 m in the …
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ISPH Modelling of Solitary Wave Interaction with Permeable Beaches
… was applied to simulations of solitary wave runup on permeable slopes. In these simulations, triangle and parallelogram porous structures with various mean grain sizes were focused. Two different scale slopes were considered to generate both nonbreaking and breaking waves. For nonbreaking …
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Effects of surfzone wave transformation on swash dynamics
… was reflected by changes to swash elevation (runup) on time-scales of a few hours. Significant runup height Rs, defined as 4 times the standard deviation of the waterline time series, varied by a factor of 2 between low tide, when most of the waves were breaking over the sandbar and high tide, …
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Numerical Perspective on Tsunami Hazards and Their Mitigation by Coastal Vegetation
… of a transition zone located between where runup is not affected at all and where runup suffers the maximum reduction by the vegetation. This infers the requirement of a minimum length of the vegetated barrier in order to achieve the maximum runup reduction under a specific set properties …
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Quantifying turbidity current interactions with topography
… are used to illustrate the importance of current runup onto the outer banks of channel bends. This runup resulted in focused overbank flow and production of thick, coarse, steep levees at these sites.
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MPM study of water wave interaction with porous seawalls
… Previous studies have demonstrated that the runup height, which determines the risk of overtopping, is primarily dependent on the still water depth, wave amplitude and ground slope. This thesis investigates the effect of manipulating the mean grain size of a permeable barrier on the runup …
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Coastal Overwash: Processes and Modelling
… over the crest of a beach system when the runup level of waves or the water level, often enhanced by storm surge, exceeds the local beach or dune crest height. The impacts of overwash on coastal barriers or low lying mainland coasts are striking. Overwash may cause deposition of sand on and …
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Wind-Driven Sea Surface Wave and Coastal Water Level Dynamics Across Different Spatial Scales
… run to investigate the relationship between wave runup-driven infiltration into the subsurface and various beach properties. The findings of this study emphasize the importance of wind resolution in models with large domains and the error induced by model input uncertainty. Increased mean sea …
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Tsunami Excitation Estimation from Real-time GNSS
… time, typically 10-20 minutes, before local runup occurs. Real-time GNSS measurements of coseismic offsets may be used to estimate finite faulting within 1-2 minutes and, in turn, tsunami excitation for local warning purposes (Blewitt et al., 2006; Melgar and Bock, 2013; Yue and Lay, 2011). …
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Field and numerical investigations of wave transformation and inundation on atoll islands
… sea level rise (SLR) on shoreline wave energy, runup and inundation within atoll environments. Field data from Fatato Island indicate clear tidal controls on sea swell (SS) waves and setup at the reef flat and shoreline, but identify no tidal influence on infragravity (IG) waves that were …
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Barrier island groundwater dynamics
… of the dune face, which was the maximum wave runup location. Differences in inland propagation between tidal- and storm-induced groundwater head fluctuations are explained using analytical theories for intermediate depth aquifers. Additionally, a separate analytical water-table evolution model …
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Physical Modelling of Instability in Granular Soils and Tsunami Hazards Associated with Coastal Slope Failures
… and the wave generation, propagation and runup were captured through wave capacitance gauges and cameras. Both the seaward- and landward-directed waves associated with fully submerged failures were quantified. The observed seaward wave amplitudes agree with existing empirical relationships …
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Barrier Island Groundwater Dynamics
… of the dune face, which was the maximum wave runup location. Differences in inland propagation between tidal- and storm-induced groundwater head fluctuations are explained using analytical theories for intermediate depth aquifers. Additionally, a separate analytical water-table evolution model …
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Experimental study of internal gravity waves over a slope
… inviscid solutions. A zone of breaking or runup is induced by these high-frequency waves well upslope. Shadowgraph observations show that, if the wave characteristics are coincident, or nearly so, with the bottom slope, the upslope propagation of the low-frequency waves causes a line of …
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Identification, Mapping, Analysis, and Dating of Composite Mega Landslides in the Colorado Plateau
… source of water to carve it. Poncho’s Radical Runup is the dissected remains of one of the highest landslide run up features in North America"--Abstract, p. iv</p>
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A Framework for Assessing Lower-Bound Bearing Capacity of Sandy Coastal Sediments from Remotely Sensed Imagery
… change rapidly in response to tidal stages, wave runup, and storm events. To date, there have been limited investigations into the use of satellite-based data for characterizing geotechnical properties of sandy beach sediments. Furthermore, the use of these moisture contents to estimate the soil …
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On the role of biomass on coastal morphodynamics in natural and urban Mediterranean beaches
… during the most energetic storm events, limiting runup and flooding extension. Finally, another original contribution of this work is related to the analysis of the banquette deposition and dismantling dynamics, through a four years video monitoring system database in one of the most urbanized …
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