The Experts below are selected from a list of 11124 Experts worldwide ranked by ideXlab platform
Efim Pelinovsky - One of the best experts on this subject based on the ideXlab platform.
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Tsunami Wave Run-up on a Vertical Wall in Tidal Environment
Pure and Applied Geophysics, 2017Co-Authors: Ira Didenkulova, Efim PelinovskyAbstract:We solve analytically a nonlinear problem of shallow water theory for the Tsunami Wave run-up on a vertical wall in tidal environment. Shown that the tide can be considered static in the process of Tsunami Wave run-up. In this approximation, it is possible to obtain the exact solution for the run-up height as a function of the incident Wave height. This allows us to investigate the tide influence on the run-up characteristics.
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Tsunami Waves generated by submarine landslides of variable volume: analytical solutions for a basin of variable depth
Natural Hazards and Earth System Sciences, 2010Co-Authors: Irina Didenkulova, Efim Pelinovsky, Irina Nikolkina, Narcisse ZahiboAbstract:Abstract. Tsunami Wave generation by submarine landslides of a variable volume in a basin of variable depth is studied within the shallow-water theory. The problem of landslide induced Tsunami Wave generation and propagation is studied analytically for two specific convex bottom profiles (h ~ x4/3 and h ~ x4). In these cases the basic equations can be reduced to the constant-coefficient Wave equation with the forcing determined by the landslide motion. For certain conditions on the landslide characteristics (speed and volume per unit cross-section) the Wave field can be described explicitly. It is represented by one forced Wave propagating with the speed of the landslide and following its offshore direction, and two free Waves propagating in opposite directions with the Wave celerity. For the case of a near-resonant motion of the landslide along the power bottom profile h ~ xγ the dynamics of the Waves propagating offshore is studied using the asymptotic approach. If the landslide is moving in the fully resonant regime the explicit formula for the amplitude of the Wave can be derived. It is demonstrated that generally Tsunami Wave amplitude varies non-monotonically with distance.
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Influence of the Initial Wave Shape on Tsunami Wave Runup Characteristics
Solutions to Coastal Disasters 2008, 2008Co-Authors: Ira Didenkulova, Efim Pelinovsky, Tarmo SoomereAbstract:The problem of the Tsunami Wave runup on a beach of constant slope is discussed in the framework of rigorous solutions of the one-dimensional nonlinear shallow-water theory. The key and novel moment here is the analysis of influence of initial Wave shape on extreme (maximal) characteristics of the Wave on a beach (runup and drawdown heights, runup and drawdown velocities and breaking parameter)
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Distribution Functions of Tsunami Wave Heights
Natural Hazards, 2002Co-Authors: Byung Ho Choi, Efim Pelinovsky, Igor Ryabov, Sung Jin HongAbstract:The problem of describing the distribution functions of Tsunami Wave heights is discussed. Data on runup heights obtained in field surveys of several Tsunamis for the last decade are used to calculate the empirical distribution functions. It is shown that the log-normal distribution describes the observed data well. This means that the irregular topography and coastline are major factors which influence the height distribution. The power distribution related with the geometric decay of the propagated Wave is a good approximation for one event (Sulawesi, January 1, 1996) only. Results of a numerical simulation of the Tsunami event in the Japan (East) Sea on July 12, 1993 are presented. It is shown that the computed Wave height distribution, obtained by using the runup correction in the framework of nonlinear shallow-water theory, is in good agreement with the observed height distribution. Simulations are used to study the transformation of the distribution function on different distances from the source.
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Nonlinear mechanism of Tsunami Wave generation by atmospheric disturbances
Natural Hazards and Earth System Sciences, 2001Co-Authors: Efim Pelinovsky, T. G. Talipova, Andrey Kurkin, Christian KharifAbstract:Abstract. The problem of Tsunami Wave generation by variable meteo-conditions is discussed. The simplified linear and nonlinear shallow water models are derived, and their analytical solutions for a basin of constant depth are discussed. The shallow-water model describes well the properties of the generated Tsunami Waves for all regimes, except the resonance case. The nonlinear-dispersive model based on the forced Korteweg-de Vries equation is developed to describe the resonant mechanism of the Tsunami Wave generation by the atmospheric disturbances moving with near-critical speed (long Wave speed). Some analytical solutions of the nonlinear dispersive model are obtained. They illustrate the different regimes of soliton generation and the focusing of frequency modulated Wave packets.
Yini Wang - One of the best experts on this subject based on the ideXlab platform.
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Numerical study of Tsunami Wave run-up and land inundation on coastal vegetated beaches
Computers & Geosciences, 2019Co-Authors: Hongxing Zhang, Mingliang Zhang, Yini WangAbstract:Abstract Vegetation exerts a significant damping effect on Tsunami Wave run-up on coastal beaches, thus effectively mitigating the Tsunami hazard. A depth-integrated two-dimensional numerical model (HydroSed2D, Liu et al., 2008; Liu et al., 2010) is developed to investigate Tsunami Wave run-up and land inundation on coastal beaches covered with Pandanus odoratissimus ( P. odoratissimus ). The present model is based on a finite volume Roe-type scheme, that solves the non-linear shallow water equations with the capacity of treating the wet or dry boundary at the Wave front. The momentum equations in this model are modified by adding a drag force term, thus considering the resistance effects of vegetation on Tsunami Waves. The accuracy of the numerical scheme and the vegetation drag force are validated by three experimental cases of dam-break flow propagation in a dry channel, solitary Wave propagation in a vegetated flume, and Tsunami run-up over an uneven bed. Subsequently, a numerical model is applied to simulate Tsunami run-up and land inundation on actual-scale vegetated beaches and a series of sensitive analyses are conducted by comparing numerical results. The obtained numerical results suggest that P. odoratissimus can effectively attenuate Tsunami run-up and land inundation distance on coastal beaches, and a higher attenuation rate for Tsunami Wave can be achieved by increasing both vegetation width and vegetation density. The Tsunami Wave height is also an important factor that impacts the Tsunami Wave run-up and land inundation on vegetated beaches.
Koji Kawaguchi - One of the best experts on this subject based on the ideXlab platform.
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field investigation of long term mooring chain system durability of the gps Tsunami Wave meter
Coastal Engineering Proceedings, 2014Co-Authors: Yukihiro Terada, Toshihiko Nagai, Teruyuki Kato, Yasuhiro Matsushita, Koji KawaguchiAbstract:This paper aims for providing basic information of the mooring design of the GPS mounted Tsunami-Wave meter buoy, which successfully observed exact offshore Tsunami profile of the 2011 off the Pacific coast of Tohoku Earthquake. Deep-sea sensors can detect Tsunami profiles minutes before its arrival on the coast. That is very important to prevent and/or reduce Tsunami disasters (Nagai, et.al., 2006). But as Tsunamis are very rare events for human life scale, it is difficult for human societies to keep the offshore Tsunami monitoring system in good condition for long years, if the system is applicable only for Tsunami detection. Real-time offshore Tsunami detection system should be well maintained only if the system provides us routine useful sea information like Waves and swells. Routine multi-purpose usefulness of the observed data may make the system more cost effective than only be applicable for very rare and immediate Tsunami monitoring (Nagai, et.al., 2007). Existing deep-sea seabed installed pressure gauge is applicable only to Tsunami event, for deep-sea Wave and swell actions do not reach the seabed. That is why offshore GPS buoy system is the only one technique that has succeeded to serve authorized real-time Tsunami warning before its arrival to the coast line at the 2011 off the Pacific coast of Tohoku Earthquake Tsunami event in Japan. In this paper, authors introduce observation data of proto-type GPS buoy's mooring chain at 3 years and 7 months after the installation in the severe sea condition, in order to provide information for practical design of future safer and more economical design of the mooring system.
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field investigation of long term mooring chain system durability of the gps Tsunami Wave meter
Coastal Engineering Proceedings, 2014Co-Authors: Yukihiro Terada, Toshihiko Nagai, Teruyuki Kato, Yasuhiro Matsushita, Koji KawaguchiAbstract:This paper aims for providing basic information of the mooring design of the GPS mounted Tsunami-Wave meter buoy, which successfully observed exact offshore Tsunami profile of the 2011 off the Pacific coast of Tohoku Earthquake. Deep-sea sensors can detect Tsunami profiles minutes before its arrival on the coast. That is very important to prevent and/or reduce Tsunami disasters (Nagai, et.al., 2006). But as Tsunamis are very rare events for human life scale, it is difficult for human societies to keep the offshore Tsunami monitoring system in good condition for long years, if the system is applicable only for Tsunami detection. Real-time offshore Tsunami detection system should be well maintained only if the system provides us routine useful sea information like Waves and swells. Routine multi-purpose usefulness of the observed data may make the system more cost effective than only be applicable for very rare and immediate Tsunami monitoring (Nagai, et.al., 2007). Existing deep-sea seabed installed pressure gauge is applicable only to Tsunami event, for deep-sea Wave and swell actions do not reach the seabed. That is why offshore GPS buoy system is the only one technique that has succeeded to serve authorized real-time Tsunami warning before its arrival to the coast line at the 2011 off the Pacific coast of Tohoku Earthquake Tsunami event in Japan. In this paper, authors introduce observation data of proto-type GPS buoy's mooring chain at 3 years and 7 months after the installation in the severe sea condition, in order to provide information for practical design of future safer and more economical design of the mooring system.
Dan Liberzon - One of the best experts on this subject based on the ideXlab platform.
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Tsunami Wave suppression using submarine barriers
Physics-Uspekhi, 2010Co-Authors: Aleksei M. Fridman, An. G. Marchuk, Leonid Alperovich, Lev Shemer, Lev Pustilnik, D Shtivelman, Dan LiberzonAbstract:Submerged barriers, single or double, can be used to greatly reduce the devastating effect of a Tsunami Wave according to a research flume study conducted at Tel Aviv University.
Ali Pak - One of the best experts on this subject based on the ideXlab platform.
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sph numerical simulation of Tsunami Wave forces impinged on bridge superstructures
Coastal Engineering, 2017Co-Authors: Mohammad Sarfaraz, Ali PakAbstract:Abstract This paper addresses numerically-derived Tsunami Wave loads on bridge superstructures using smoothed particle hydrodynamics (SPH), which is a type of mesh-free methods. Although there exist some relationships for the case of impinged loads on bridges exerted by regular (sinusoidal) Waves, for the case of solitary Waves such as Tsunamis, no relation has yet been proposed in the literature. This shortcoming is partly due to the lack of understanding the mechanism of Wave action on the bridge superstructures. In this study, three water depths, three Wave amplitudes and four submergence depths of the deck are considered for the process of numerical investigation of Tsunami-induced loads on bridge superstructures. The bridge elevation is chosen such that its deck may become either completely emerged, partially submerged or completely submerged upon occurrence of the Tsunami event. Comparison of the numerical results with the experiment recordings approves high level of accuracy of the SPH scheme. Based on the obtained results from the numerical modeling, the maximum applied horizontal and vertical forces, to the bridge superstructure are presented for each configuration of water depths, Wave amplitudes, and deck elevations. In this way, the maximum clockwise/counterclockwise moments induced at the center of the structure are also determined. Simple non-dimensional equations are proposed for computing the Tsunami-induced forces and moments to the bridge superstructures, which can be used for designing the bridge superstructures at the coastal areas.
