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1 edition of A numerical study of rain-induced surface gravity wave attenuation found in the catalog.

A numerical study of rain-induced surface gravity wave attenuation

David W. Howell

A numerical study of rain-induced surface gravity wave attenuation

by David W. Howell

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Published by Naval Postgraduate School, Available from the National Technical Information Service in Monterey, Calif, Springfield, Va .
Written in English


Edition Notes

ContributionsNystuen, Jeffrey A.
The Physical Object
Pagination31 p.
Number of Pages31
ID Numbers
Open LibraryOL25450585M

2 DATA AND METHOD Data used in this study. To investigate the observed characteristics of the apparent P-wave radiation pattern, we used three-component velocity seismograms recorded at Hi-net stations (grey squares in Fig. 1).Hi-net is a high-sensitivity seismogram network operated by the National Research Institute for Earth Science and Disaster Prevention, Japan (Okada et al. ). Moreover, a new numerical model is proposed, aiming at obtaining a simple, efficient, and accurate tool to simulate the combined motion of gravity currents and surface waves. The model is derived by assuming that surface waves are not affected by gravity current propagation at the leading order and that the total velocity field is the sum of.

4. Title: An Analytic Solution of Undular Surface Waves Generated by Water Flows Cheng-Tsung Chen1, Jaw-Fang Lee2, Hubert Chanson3, and Kuei-Ting Lin4 Abstract: Abstract: In this paper, an analytic solution is presented for the problem of evolution of undular surface waves generated by water flow given at one end of a water channel. An initial. Adequacy of Free Surface Conditions for the Wave Resistance Problem –; The Dispersion of Large-Amplitude Gravity Waves in Deep Water –; Three-Dimensional, Unsteady Computations of Nonlinear Waves Caused by Underwater Disturbances –; A Numerical Solution Method for Three-Dimensional Nonlinear Free Surface Problems –

Tsimplis & Thorpe () proposed that the observed rain-induced wave damping results from the rain-generated turbulence where a near-surface high eddy viscosity layer viscously damps the surface waves. Shortly after, Nystuen () estimated the wave attenuation when a thin, rain-induced, high viscosity mixed layer is present near the surface. motion is limited to the surface layer of depth O(λ). Gravity and capillary-gravity waves are therefore surface waves. For pure gravity waves in shallow water, T= 0 and kh˝ 1, we get u = gkA ω eikx−iωt () w =0, () p = −ρ ∂Φ ∂t = ρgAeikx−iωt = ρgζ () Note that the horizontal velocity is uniform in depth while the.


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A numerical study of rain-induced surface gravity wave attenuation by David W. Howell Download PDF EPUB FB2

A numerical study of rain-induced surface gravity wave Attenuation [Howell, David W.] on *FREE* shipping on qualifying offers. A numerical study of rain-induced surface gravity wave Attenuation. Calhoun: The NPS Institutional Archive Theses and Dissertations Thesis Collection A numerical study of rain-induced surface gravity wave attenuation.

An illustration of an open book. Books. An illustration of two cells of a film strip. Video. An illustration of an audio speaker. Audio An illustration of a " floppy disk. A numerical study of rain-induced surface gravity wave attenuation. Item Preview remove-circle Share or Embed This :   Strong rain induced mixing in a thin surface layer is numerically shown to greatly increase surface gravity wave attenuation.

This case study uses a single wavelength ( m) together with two mixed layer depths (10 and 20 cm). The rain induced mixing is simulated by varying kinematic viscosity within the mixed layer from to sq m per sec, molecular to strong turbulent Author: David W.

Howell. The rain-induced mixing is simulated by varying kinematic viscosity within the mixed layer from 10"* to 10"^ m- r*', molecular to strong turbulent mixing, respectively.

The results indicate that surface gravity wave attenuation in the presence of a thin rain-induced mixed layer can increase by a factor of up to 60U0 times the attenuation rate Author: David W.

Howell. Wave-induced ice-floe collisions contribute to the attenuation of surface gravity waves, but the nature of the interfloe collisions is not well understood.

Two parameters, the restitution coefficient and the collision duration, are associated and considered important to describe interfloe interactions.

Rain-induced wave attenuation rates are weak or very strong depending on whether they are expressed in terms of energy scaling obtained from above or below the surface respectively, due to the. When gravity waves move across the surface of a liquid of small viscosity, the influence is usually of the third order in the wave slope and results in a slow attenuation of the waves of the form a(t) Xin Guo, Lian Shen, Numerical study of the effect of surface waves on turbulence underneath.

Part 1. we study resonant interactions of two mutually-orthogonal gravity wave trains and compare our numerical solutions with available theory and ex-perimental data. We also simulate the evolution of a realistic surface wave field, characterized initially by the JONSWAP spectrum, and examine the occurrence of a larger wave compared with the.

The study reveals that the reflection coefficient increases and the transmission coefficient decreases with an increase in wave steepness in the case of deep water for a wave attenuating system having four slotted barriers, whilst these scattering coefficients are almost invariant of wave steepness in case of shallow water.

A numerical model is developed based on multidomain boundary element method (MBEM) to investigate the scattering of surface gravity waves by a pair of floating porous boxes.

This study reveals that there is a significant reduction in wave forces acting on the boxes with the introduction of structural porosity.

A major field experiment was conducted which obtained measurements of the attenuation and transformation of short gravity waves as they cross the windward edge of an offshore coral reef.

Water level data were collected for over individual time series during a. () Numerical study of solitary wave attenuation in a fragmented ice sheet. Physical Review Fluids () An operator expansion method for computing nonlinear surface waves on a ferrofluid jet.

arranged piles in a single soil medium and to study the feasibility of surface waves attenuation by nite element tech- nique. W e consider the idea of seismic metamaterials in this study. Numerical simulations to study the wave–turbulence interaction process were also carried out by Babanin and Chalikov () and Savelyev et al.

The numerical model decomposes the flow into a two-dimensional potential flow of surface waves and a three-dimensional vortical flow of turbulence. A Numerical Study of Rain-induced Surface Gravity Wave Attenuation by David W. Howell Lieutenant, United States Navy B.S., Texas A&M University, Submitted in partial fulfillment of the requirements for the degree of MASTER OF SCIENCE IN METEOROI-OGY AND PIIYSICAl.

O('EANOGRAPIIY from the NAVA. POSTG RA TM 'ATE SCI IOOI. Selezov and V. Sorokina, “Investigation of refraction of surface gravity waves in the case of a linear change in the depth of the fluid,” Gidromekhanika, No. 34 (). Google Scholar 4. The direct numerical simulation (DNS) of the laboratory experiment of Plumb and McEwan () exhibits wave reflec-tion, wave interference, wave-mean flow interaction and wave breaking.

It enables the study of internal (gravity) wave processes and their numerical realisability in a confined “laboratory” environment. When the current velocity was m /s and the wave height was 4 cm, the maximum mooring line tension under 30° and 60° decreased % and % on average compared with that under 0°; When the current velocity was m/s and the wave height was 8 cm, the maximum mooring line tension under 30° and 60° decreased by % and % on.

This work considers the problems of numerical simulation of non-linear surface gravity waves transformation under shallow bay conditions.

The discrete model is built from non-linear shallow-water equations. Are resulted boundary and initial conditions. The method of splitting into physical processes receives system from three equations. Then we define the approximation order and investigate. The land–sea-breeze circulation, characterized by onshore or offshore flows near the surface and rising or sinking currents on the either side of the coast, is the part treated by linear theory, while the other phenomena mentioned above are nonlinear features (Yan and Anthes ).The land–sea-breeze circulation is found to effect to the flow over and away from the coast, which may be.

The generation of ultra-low frequency acoustic noise ( to 1 Hz) by the nonlinear interaction of ocean surface gravity waves is well established. More controversial are the quantitative theories that attempt to predict the recorded noise levels and their variability.

Here a single theoretical framework is used to predict the noise level associated with propagating pseudo-Rayleigh modes and.That study used a ground forcing technique in order to model tsunami-induced gravity waves: however to our knowledge acoustic-gravity wave propagation with stratified profiles of wind and strongly varying density, sound speed and viscosity has never been implemented in 3-D.

Atmospheric attenuation is crucial for realistic simulations.