The Experts below are selected from a list of 8622 Experts worldwide ranked by ideXlab platform
S. F. Dotsenko - One of the best experts on this subject based on the ideXlab platform.
-
Numerical modeling of the propagation and strengthening of Tsunami Waves near the Crimean Peninsula and the Northeast Coast of the Black Sea
Physical Oceanography, 2010Co-Authors: S. F. Dotsenko, A. V. IngerovAbstract:The linear model of long Waves is used for the evaluation of the parameters of Tsunami Waves along the South Coast of Crimea, in the near-Kerch zone, and near the northeast coast of the Black Sea. Our numerical investigations are carried out for 24 probable locations of the elliptic zones of Tsunami generation over the continental slope of the basin. The amplitude characteristics of Tsunamis are computed for 27 sites of the Black-Sea coast. It is shown that significant strengthening of Tsunami Waves is possible in the course of their propagation toward the coast. The highest Waves are formed at the sites of the coast closest to the seismic source. The dependence of the intensity of Tsunami Waves along the Black-Sea coast on the location of the seismic source and its magnitude is analyzed.
-
Characteristics of Tsunami Waves in the Black Sea according to the data of measurements
Physical Oceanography, 2007Co-Authors: S. F. Dotsenko, A. V. IngerovAbstract:We present the general description of Tsunami Waves in the Black Sea. The quantitative characteristics of four historical events are revised by using the digitized marigrams and their spectral analysis. As a rule, Tsunami Waves are characterized by the initial elevation of the sea level and the height of the first wave is not maximum. The maximum heights of the recorded Tsunami Waves at the points of observation do not exceed 52 cm. For the major part of points on the sea coast, we observe a noticeable trend toward the increase in the heights of Waves with the magnitude of the earthquake. The typical periods of Tsunami Waves and background variations of the sea level lie within the intervals 8–39min and 28–193min, respectively.
-
Evaluation of the Parameters of Tsunami Waves along the South Coast of the Crimean Peninsula
Physical Oceanography, 2005Co-Authors: S. F. DotsenkoAbstract:Within the framework of a nonlinear model of long Waves, we present the estimates of the parameters of Tsunami Waves along the south coast of the Crimean Peninsula (from Cape Khersones to Cape Meganom) with a space resolution of 2.5 km. The numerical analysis is carried out for four typical positions of the elliptic zones of generation and the range of magnitudes 6.5–7.5. We study the space structure of Waves and determine the amplitudes and periods of oscillations of the level at 11 points of the analyzed part of the coastline of the Black Sea.
-
Run-Up of a Solitary Tsunami Wave on a Sloping Coast
Physical Oceanography, 2005Co-Authors: S. F. DotsenkoAbstract:Within the framework of the nonlinear theory of long Waves, we perform the numerical analysis of the one-dimensional run-up of solitary Tsunami Waves upon a plane sloping coast. We study the dependences of the run-up heights on the parameters of Waves at the entrance of the shelf zone and on the slope of the coast. The run-up heights of Tsunami Waves are estimated for the bottom topography typical of the south coast of the Crimean Peninsula.
-
Amplitude-Energy Characteristics of Tsunami Waves for Various Types of Seismic Sources Generating Them
Physical Oceanography, 2002Co-Authors: A. S. Velichko, S. F. Dotsenko, É. N. PotetyunkoAbstract:We perform a comparative analysis of the amplitude-energy characteristics of Tsunami Waves caused by seismic sources of four types. For the description of Tsunami Waves, we use linear equations of long Waves. The deformations of the bottom of the ocean are found from the solution of a problem of elasticity theory for a half space regarded as a model of the lithosphere. The investigation is based on the analytic solutions obtained by the method of integral transformations.
Yingchun Liu - One of the best experts on this subject based on the ideXlab platform.
-
modeling of Tsunami Waves and atmospheric swirling flows with graphics processing unit gpu and radial basis functions rbf
Concurrency and Computation: Practice and Experience, 2010Co-Authors: Jessica Schmidt, David A. Yuen, Yingchun Liu, Cecile Piret, Nan Zhang, Benjamin J Kadlec, Grady B Wright, Erik O. D. SevreAbstract:The faster growth curves in the speed of graphics processing units (GPUs) relative to CPUs have spawned a new area of development in computational technology. There is much potential in utilizing GPUs for solving evolutionary partial differential equations and producing the attendant visualization. We are concerned with modeling Tsunami Waves, where computational time is of extreme essence in broadcasting warnings. We employed an NVIDIA board on a MacPro to test the efficacy of the GPU on the set of shallow-water equations, and compared the relative speeds between CPU and GPU for two types of spatial discretization based on second-order finite differences and radial basis functions (RBFs). We found that the GPU produced a speedup by a factor of 8 in favor of the finite difference method and a factor of 7 for the RBF scheme. We also studied the atmospheric dynamics problem of swirling flows over a spherical surface and found a speedup of 5.3 by the GPU. The time steps employed for the RBF method are larger than those used in finite differences, because of the fewer number of nodal points needed by RBF. Thus, RBF acting in concert with GPU would hold great promise for Tsunami modeling because of the spectacular reduction in the computational time. Copyright © 2009 John Wiley & Sons, Ltd.
-
comparison of linear and nonlinear shallow wave water equations applied to Tsunami Waves over the china sea
Acta Geotechnica, 2009Co-Authors: Erik O. D. Sevre, David A. Yuen, Yingchun Liu, Yaolin Shi, Xiaoru Yuan, Huilin XingAbstract:This paper discusses the applications of linear and nonlinear shallow water wave equations in practical Tsunami simulations. We verify which hydrodynamic theory would be most appropriate for different ocean depths. The linear and nonlinear shallow water wave equations in describing Tsunami wave propagation are compared for the China Sea. There is a critical zone between 400 and 500 m depth for employing linear and nonlinear models. Furthermore, the bottom frictional term exerts a noticeable influence on the propagation of the nonlinear Waves in shallow water. We also apply different models based on these characteristics for forecasting potential seismogenic Tsunamis along the Chinese coast. Our results indicate that Tsunami Waves can be modeled with linear theory with enough accuracy in South China Sea, but the nonlinear terms should not be neglected in the eastern China Sea region.
-
Visualization of Tsunami Waves with Amira package
Visual Geosciences, 2008Co-Authors: Erik O. D. Sevre, David A. Yuen, Yingchun LiuAbstract:In recent years numerical investigations of Tsunami wave propagation have been spurred by the magnitude 9.3 earthquake along the Andaman–Sumatra fault in December, 2004. Visualization of Tsunami Waves being modeled can yield a much better physical understanding about the manner of wave propagation over realistic seafloor bathymetries. In this paper we will review the basic physics of Tsunami wave propagation and illustrate how these Waves can be visualized with the Amira visualization package. We have employed both the linear and nonlinear versions of the shallow-water wave equation. We will give various examples illustrating how the files can be loaded by Amira, how the wave-heights of the Tsunami Waves can be portrayed and viewed with illumination from light sources and how movies can be used to facilitate physical understanding and give important information in the initial stages of wave generation from interaction with the ambient geological surroundings. We will show examples of Tsunami Waves being modeled in the South China Sea, Yellow Sea and southwest Pacific Ocean near the Solomon Islands. Visualization should be a part of any training program for teaching the public about the potential danger arising from Tsunami Waves. We propose that interactive visualization with a web-portal would be useful for understanding more complex Tsunami wave behavior from solving the 3-D Navier–Stokes equation in the near field.
Efim Pelinovsky - One of the best experts on this subject based on the ideXlab platform.
-
Nonlinear effects at the initial stage of Tsunami-wave development
Izvestiya Atmospheric and Oceanic Physics, 2013Co-Authors: Efim Pelinovsky, A. A. RodinAbstract:An analytical solution to shallow-water nonlinear equations determining the height of Tsunami Waves leaving the source is obtained. The initial water-level displacement in the source and the distribution of particle velocities are set. The numerical solution showed that analytical estimates fit well with source characteristics varying in a broad range, even if the Waves produced by the source collapse.
-
runup of Tsunami Waves in u shaped bays
Pure and Applied Geophysics, 2011Co-Authors: Ira Didenkulova, Efim PelinovskyAbstract:The problem of Tsunami wave shoaling and runup in U-shaped bays (such as fjords) and underwater canyons is studied in the framework of 1D shallow water theory with the use of an assumption of the uniform current on the cross-section. The wave shoaling in bays, when the depth varies smoothly along the channel axis, is studied with the use of asymptotic approach. In this case a weak reflection provides significant shoaling effects. The existence of traveling (progressive) Waves, propagating in bays, when the water depth changes significantly along the channel axis, is studied within rigorous solutions of the shallow water theory. It is shown that traveling Waves do exist for certain bay bathymetry configurations and may propagate over large distances without reflection. The Tsunami runup in such bays is significantly larger than for a plane beach.
-
runup of Tsunami Waves in u shaped bays
arXiv: Atmospheric and Oceanic Physics, 2010Co-Authors: Ira Didenkulova, Efim PelinovskyAbstract:The problem of Tsunami wave shoaling and runup in U-shaped bays (such as fjords) and underwater canyons is studied in the framework of shallow water theory. The wave shoaling in bays, when the depth varies smoothly along the channel axis, is studied with the use of asymptotic approach. In this case a weak reflection provides significant shoaling effects. The existence of traveling (progressive) Waves, propagating in bays, when the water depth changes significantly along the channel axis, is studied. It is shown that traveling Waves do exist for certain bay bathymetry configurations and may propagate over large distances without reflection. The Tsunami runup in such bays is significantly larger than for a plane beach.
-
run up characterstics of symmetrical solitary Tsunami Waves of unknown shapes
arXiv: Atmospheric and Oceanic Physics, 2008Co-Authors: Ira Didenkulova, Efim Pelinovsky, Tarmo SoomereAbstract:The problem of Tsunami wave run-up on a beach is discussed in the framework of the rigorous solutions of the nonlinear shallow-water theory. We present an analysis of the run-up characteristics for various shapes of the incoming symmetrical solitary Tsunami Waves. It will be demonstrated that the extreme (maximal) wave characteristics on a beach (run-up and draw-down heights, run-up and draw-down velocities and breaking parameter) are weakly dependent on the shape of incident wave if the definition of the significant wave length determined on the 2/3 level of the maximum height is used. The universal analytical expressions for the extreme wave characteristics are derived for the run-up of the solitary pulses. They can be directly applicable for Tsunami warning because in many case the shape of the incident Tsunami wave is unknown.
-
Runup Characteristics of Symmetrical Solitary Tsunami Waves of “Unknown” Shapes
Pure and Applied Geophysics, 2008Co-Authors: Ira Didenkulova, Efim Pelinovsky, Tarmo SoomereAbstract:The problem of Tsunami wave runup on a beach is discussed in the framework of the rigorous solutions of the nonlinear shallow-water theory. We present an analysis of the runup characteristics for various shapes of the incoming symmetrical solitary Tsunami Waves. It will be demonstrated that the extreme (maximal) wave characteristics on a beach (runup and draw-down heights, runup and draw-down velocities and breaking parameter) are weakly dependent on the shape of incident wave if the definition of the “significant” wavelength determined on the 2/3 level of the maximum height is used. The universal analytical expressions for the extreme wave characteristics are derived for the runup of the solitary pulses. They can be directly applicable for Tsunami warning because in many cases the shape of the incident Tsunami wave is unknown.
Fengyan Shi - One of the best experts on this subject based on the ideXlab platform.
-
numerical simulation of Tsunami Waves generated by deformable submarine landslides
Ocean Modelling, 2013Co-Authors: James T Kirby, Fengyan ShiAbstract:Abstract This paper presents a new submarine landslide model based on the non-hydrostatic wave model NHWAVE of Ma et al. (2012) . The landslide is modeled as a water–sediment mixture. The dense plume is driven by baroclinic pressure forcing introduced by spatial density variations. The model is validated using laboratory measurements of turbidity currents and of water wave generation by a granular landslide. The model is then utilized to study the dependence of landslide motion and associated Tsunami wave generation on parameters including sediment settling velocity, initial depth of the landslide and slide density. Model results show that the slide motion and water Waves which it generates are both sensitive to these parameters. The relative Tsunamigenic response to rigid and deformable landslides of equal initial geometry and density is also examined. It is found that the wave energy is mostly concentrated on a narrow band of the dominant slide direction for the Waves generated by rigid landslides, while directional spreading is more significant for Waves generated by deformable landslides. The deformable landslide has larger speed and acceleration at the early stage of landslide, resulting in larger surface Waves. The numerical results indicate that the model is capable of reasonably simulating Tsunami wave generation by submarine landslides.
Noel Brizuela - One of the best experts on this subject based on the ideXlab platform.
-
internal Tsunami Waves transport sediment released by underwater landslides
Scientific Reports, 2019Co-Authors: Noel Brizuela, Anatoliy Filonov, Matthew H AlfordAbstract:Accelerated by gravity, submarine landslides transfer energy to the marine environment, most notably leading to catastrophic Tsunamis. While Tsunamis are thought to use less than 15% of the total energy released by landslides, little is known about subsurface processes comprising the rest of their energy budgets. Here, we analyze the first set of observations depicting a lake’s interior response to underwater landslides and find that sediment transport is modulated by baroclinic Waves that propagate along vertical gradients in temperature and sediment concentration. When traveling along a shallow thermocline, these Waves can reach past topographic features that bound turbidity currents and thus expand the influence area of underwater landslides. With order of magnitude calculations, we estimate that observed thermocline internal Waves received roughly 0.7% of available landslide energy and infer their contribution to homogenize the lake’s thermodynamical properties by means of turbulent mixing. Lastly, we show that landslides in our data set modified the lake’s intrinsic dynamical modes and thus had a permanent impact on its circulation. This suggests that measurements of subsurface wave propagation are sufficient to diagnose bathymetric transformations. Our experiment constitutes the first direct observation of both internal Tsunami Waves and turbidity current reflection. Moreover, it demonstrates that background density stratification has a significant effect on the transport of sediment after submarine landslides and provides a valuable reference for numerical models that simulate submarine mass failures.
