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Showing 1 to 20 of 27 for “"swash"”.
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Effects of surfzone wave transformation on swash dynamics
Swash oscillations on two natural beaches were measured to show that the shape and magnitude of energy spectra can be largely dependent on processes occurring inside the surfzone. The observations took place on a steep, intermediate beach on the east coast (Tairua Beach), and a low-sloping, …
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Near-bed hydrodynamics and sediment transport in the swash zone
The swash zone, the section of the beach that is alternatingly inundated and exposed as a result of wave runup, is an important part of the nearshore coastal zone because of hydrodynamic and sediment transport processes that affect the morphology and ecology of the broader littoral area. The …
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Lubrication in the ball and socket joint of a swash plate mechanism
… the ball and socket on the connecting rod in a swash plate engine is studied in the hydrodynamic regime. The engine operates at 1390rpm with an axial load on the rod as high as 1 x 10⁴N. The instantaneous load and kinematics from a previous study for a swash plate engine was used as the input. …
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SPH modeling of the vertical flow structure and turbulence in the swash
The vertical structure of swash-zone flows and turbulence, which is critical to sediment transport and flooding due to over-topping of dunes, will be examined using a Smoothed Particle Hydrodynamics model (DualSPHysics) evaluated with field observations obtained near La Jolla, CA in fall 2003. The …
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Horizontal pressure gradient and bed shear stress under double dam-break driven swash and validation of a Reynolds-Averaged Navier-Stokes equations based model
Swash zone processes drive foreshore morphodynamics through sediment transport gradients. Sediment transport rates are often estimated using bed shear stress as the main hydrodynamic driver. However, the importance of pressure gradients relative to bed shear stress in the swash zone is still poorly …
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Bed shear stress under wave runup on steep slopes
Extensive measurements of swash hydrodynamics and bed shear stress were obtained for surging, collapsing, plunging and spilling swashes, in both medium and prototype scale fixed-bed laboratory wave flumes with steep slopes (1:3 and 1:6, respectively). The hydrodynamics of swash flows were found to …
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Transport of terrigenous sediment and horseshoe crab eggs in the swash zone of an estuarine foreshore in Delaware Bay, New Jersey, USA
… for egg exhumation and transport in the swash zone is paramount to conservation of species that use the intertidal foreshore. One example where the understanding of these processes is critical to egg exhumation, transport and deposition is in Delaware Bay, USA. Beaches in Delaware Bay …
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Experimental And Analytical Investigations Of Solitary Waves On A Beach
… investigations of the flow on a beach, i.e., the swash, due to solitary waves with the objective of understanding the flow processes that govern complex coastal hydrodynamics. The bed shear stress is identified as an important quantity and consequently, a shear plate sensor is developed to make …
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The morphological, sedimentary and hydraulic properties of two coarse clastic (pebble) beaches along the heritage coast of Glamorgan, Wales
… (C-axis) was the most susceptible parameter to swash/backwash processes, and that tracers possessing relatively larger C-axes travelled relatively further along and down-beach from the injection point. An analysis of the relationship between tracers and the background beach population showed …
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A Novel Fluid Structure Interaction and Thermal Model to Predict the Cylinder Block / Valve Plate Interface Performance in Swash Plate Type Axial Piston Machines
<p>The cylinder block / valve plate interface represents one of the most critical design element in the rotating kit of axial piston machines. The thin film of lubricant between cylinder block and valve plate has to fulfill simultaneously a bearing and a sealing function under dynamic load …
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A laboratory study of the 'shoreline' detected in video imagery
… experiment was undertaken to simulate varying swash zone characteristics and sensor-target geometry found in digital images collected by ARGUS coastal imaging systems. Using a hyperspectral sensor, reflectance data were integrated over the respective red, blue and green wavelengths …
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Physical and biological factors structuring sandy beaches macrofauna communities
… beach macrofaunal communities according to the swash exclusion hypothesis (SEH). This hypothesis stated that more species are present on fine grained, flat dissipative beaches due to a more benign swash climate. It suggested that, as beach morphodynamics change to reflective conditions, which is …
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DESIGNING A CONTROL SYSTEM FOR THE AUTONOMOUS SMALL SCALE HELICOPTER
… we developed a simulated control system for the swash plate of the helicopter. Swash plate is mainly responsible for the helicopter's dynamics in rotation about X body axis (Roll) and rotation about Y body axis (Pitch). So the control system is developed and simulated in order to control the roll …
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Contribution to the Characterization of Piston Expanders for Their Use in Small-scale Power Production Systems
… of 59% at 600 RPM with a pressure ratio of 5. A swash-plate expander integrated into an ORC using R245fa is also investigated in a wide range of operating conditions. Performance maps in terms of pressure ratio and rotational speed are given. Maximal reached isentropic efficiency is 54% at 2500 …
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The Formation of Edge Waves Under Monochromatic and Random Incident Waves
… and random incident waves. Two numerical models, SWASH and GPUSPH, are used to reproduce the resonance between edge waves and incident waves. The simulation of edge wave excitation under monochromatic incident waves agrees with the observations during experiments. Meanwhile, certain drawbacks of …
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Beach development and movement as a function of water waves
… A fluorescent tracer study on the swash zone is reported on as a method of gauging littoral drift.
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Physical controls on water flow and solute transport in coastal aquifers
… forcing induces pore water circulations in the swash zone of the near-shore aquifers; wave forcing also modifies the pathways of solute transport in the beach prior to discharge into the ocean, and subsequently impacts plume's residence time, migration speed, discharge location, and discharge …
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Sediment dynamics on Wemyss beach, South Fife
… Whereas, pebble transport was restricted to the swash and backwash, in the direction of maximum wave energy. Pebbles were either buried in the sand or lay flat on the surface. The limited protrusion of the pebbles lowered the shear stress available for pebble entrainment. Furthermore, once in …
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Time Scales and Processes of Shoreline Formation in Pluvial Lakes of the Great Basin, Western USA
… 5-24 times per year. Modeled maximum total wave swash elevations for the observed significant wind events range from 0.93- 1.93 m across the three lakes studied, which is in general agreement with heights of observed beach ridges. Total incident wave energy delivered to the shorelines of interest …
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An Implicit Finite-Volume Depth-Integrated Model For Coastal Hydrodynamics And Multiple-Sized Sediment Transport
… well simulated except near the shoreline where swash processes, which are not included, become dominant. Model sensitivity to the computation grid and calibration parameters is presented for several test cases.
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