Wave-current Interaction and Quasi-three-dimensional Modeling in Nearshore Zone PDF Download
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Author: Jung Lyul Lee
Publisher:
ISBN:
Category : Ocean waves
Languages : en
Pages : 314
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Book Description
Author: Jung Lyul Lee
Publisher:
ISBN:
Category : Ocean waves
Languages : en
Pages : 314
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Book Description
Author: Antonio Fernando Garcez Faria
Publisher:
ISBN:
Category : Ocean circulation
Languages : en
Pages : 52
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Book Description
The long shore current maximum observed in the trough of a barred beach during the nearshore dynamics experiment DELILAH at Duck, North Carolina, is not predicted by present theory. The simplest longshore curren models balance cross-shore changes in the alongshore wave momentum (radiation stress) with the alongshore bottom shear stress. Waves break over the bar, reform in the trough and again break on the foreshore resulting in changes in the radiation stress, which predicts two jets, one over the bar and the other at the foreshore, which does not agree with the observed current maximum in the trough. The advection of the momentum of the longshore current by mean cross-shore currents as a source of momentum mixing is investigated. The longshore current is strongest toward the surface and decreasing to zero at the bottom. The cross-shore mean current has an onshore transport in the wave crest/trough region and an offshore transport beneath (undertow). The net interaction can induce significant lateral mixing of the alongshore momentum of the mean currents, which is shown using a simplified three- dimension model of nearshore currents to explain much of the differences with observations.
Author: Santiago Alfageme
Publisher:
ISBN:
Category : Ocean waves
Languages : en
Pages : 148
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Author: Taerim Kim
Publisher:
ISBN:
Category : Beach erosion
Languages : en
Pages : 142
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Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 262
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Book Description
In this thesis a depth integrated, shortwave averaged nearshore circulation model, called SHORECIRC, is developed, which includes the current current and current wave interactions over depth. This model belongs to the class of quasi 3D models, which combine the effect of the vertical structure with the simplicity of 2DH models. The present model uses semi-analytical solutions for the 3D current profiles in combination with a numerical solution of the depth integrated 2D horizontal equations. The goal of this model is to gain an enhanced prediction and analysis capability for nearshore circulation on any bathymetry and under any hydrodynamical condition. The current current, current wave induced dispersion mechanism has previously been found to significantly augment the lateral turbulent mixing in the case of a steady, uniform longshore current on a straight coast. In this thesis, the generalized quasi 3-D continuity and momentum equations governing nearshore circulation are presented. These equations are based on the complete Reynolds equations with as few additional assumptions as possible.
Author: William Leo Wood
Publisher:
ISBN:
Category : Bathing beaches
Languages : en
Pages : 72
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Book Description
In spring 1973 a series of field experiments was initiated to investigate the three dimensional structure of a coastal hydrodynamic system. These field investigations supported the concept that short-crested wave theory is applicable to modeling of incident wind-wave transformations from offshore to the outer surf zone. Application of short-crested wave theory to the design of coastal hydrodynamic models was also considered appropriate because of the theories inherent three dimensional structure. Concurrent with this work two field experiments were conducted in 1974 and 1976 to measure vertical and horizontal distribution of longshore current velocity and to monitor temporal variations in current velocity at a point. In fall 1978 a series of experimental laboratory investigations was initiated to make precise measurements, at close spatial intervals, of wave height decay after breaking. These experiments were carried out to determine a wave height decay expression based upon the assumption that an appropriate physical conceptualization of wave energy dissipation after breaking must consider turbulence dominant to bottom friction. This report presents a detailed summary of these investigations and their results. (Author).
Author: Hisashi Ninokata
Publisher: World Scientific
ISBN: 9810249314
Category : Technology & Engineering
Languages : en
Pages : 888
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Book Description
This book is an essential reference for engineers and scientists working in the field of turbulence. It covers a variety of applications, such as: turbulence measurements; mathematical and numerical modeling of turbulence; thermal hydraulics; applications for civil, mechanical and nuclear engineering; environmental fluid mechanics; river and open channel flows; coastal problems; ground water.
Author: Robert G. Dean
Publisher: Cambridge University Press
ISBN: 9780521602754
Category : Nature
Languages : en
Pages : 498
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Book Description
Text on coastal engineering and oceanography covering theory and applications intended to mitigate shoreline erosion.
Author: Antonio Fernando Garcez Faria
Publisher:
ISBN:
Category : Science
Languages : en
Pages : 182
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Book Description
The objective of this dissertation is to develop numerical models and compare their predictions with data acquired during the DUCK94 experiment in order to improve our physical understanding of the hydrodynamic processes governing the vertical and cross shore distributions of both longshore and cross shore currents over a barred beach. The vertical structure of the mean longshore current is found to be well described by a logarithmic profile and a relationship between bed shear stress and bottom roughness, including the influence of ripples and mega-ripples, was also found. The vertical structure of the mean cross shore current (undertow) is modeled using an eddy viscosity closure scheme to solve for the turbulent shear stress and includes contributions from breaking wave rollers. These models of the vertical profiles of longshore and cross shore mean currents are combined to formulate a quasi three dimensional model to describe the cross shore distribution of the longshore current. This model includes turbulent mixing due to the cross shore advection of mean momentum of the longshore current by the mean cross shore current and contributions from wave rollers.
Author: Yang Zhang
Publisher:
ISBN:
Category :
Languages : en
Pages :
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For rip currents, however, the impacts are much less significant because refraction and breaking are the dominant processes in this case. Finally, numerical experiments on rip currents show that wave-current interaction has significant impacts on the unsteady flow and the instabilities are sensitive to a small variation range of the angle of wave incidence.
