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Long Waves Over a Bi-viscous Seabed: Transverse Patterns : Volume ...

By: D. Bercovici; J. M. Becker

Description: Department of Geology and Geophysics, University of Hawaii at Manoa, Honolulu, HI, USA. The coupled interaction of long standing hydrodynamic waves with a deformable non-Newtonian seabed is examined using a two-layer model for which the upper layer fluid is inviscid and the lower layer is bi-viscous. The two-dimensional response of the system to forcing by a predominantly longitudinal (cross-shore) standing wave perturbed by a small trans...

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Solute Transport in Fractured Media – Analysis of Non-reversibilit...

By: J. L. M. P. De Lima; F. F. Cruz; N. E. V. Rodrigues

Description: Earth Sciences Department, Faculdade de Ciências e Tecnologia da Universidade de Coimbra, Largo Marquês de Pombal, 3000-272 Coimbra, Portugal. This paper describes several small-scale (laboratory) experiments designed to simulate solute transport through fractured formations. A block of granite was broken to produce a fracture similar to those found in natural environments. Seven holes were drilled in the block to intersect the fracture. Later these hole...

Bear, J. and Verruijt, A.: Modeling Groundwater Flow and Pollution, D Reidel Pub. Comp., Dordrecht, The Netherlands, 1987.; Bear, J., Tsang, C. F., and de Marsily, G.: Flow and Contaminant Transport in Fractured Rock, Academic Press, New York, 1993.; Carlier, E., El Khattabi, J., and Potdevin, J. L.: Solute transport in sand and chalk: a probabilistic approach, Hydrological Processes, John Wiley & Sons, 20, 1047–1055, 2006.; Cook, P. G.: A guide to regional groundwater f...

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Quantitative Analysis of Randomness Exhibited by River Channels Us...

By: T. Verbovšek; G. Žibret

Description: Geological Survey of Slovenia, Ljubljana, Slovenia. This paper presents a numerical evaluation of the randomness which can be observed in the geometry of major river channels. The method used is based upon that of generating a Sierpinski triangle via the chaos game technique, played with the sequence representing the river topography. The property of the Sierpinski triangle is that it can be constructed only by playing a chaos game with random values. P...

Jeffrey, H. J.: Chaos game visualization of sequences, Comput. Graph., 16 (1), 25–33, 1992.; Angeles, G. R, Perillo, M. E., Piccolo, M. C., and Pierini, J. O.: Fractal analysis of tidal channels in the Bahía Blanca Estuary (Argentina), Geomorphology, 57, 263–274, 2004.; Beauvais, A. A. and Montgomery, D. R.: Are channel networks statistically self-similar?, Geology, 25 (12), 1063–1066, 1997.; Barnsley M.: Fractals Everywhere, Academic Press, New York, 1988.; Horton, R. E...

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Is the Atlantic Multidecadal Oscillation (Amo) a Statistical Phant...

By: M. Vincze; I. M. Jánosi

Description: Department of Physics of Complex Systems, Eötvös Loránd University, Pázmány P. s. 1/A, 1117 Budapest, Hungary. In this work we critically compare the consequences of two assumptions on the physical nature of the AMO index signal. First, we show that the widely used approach based on red noise statistics cannot fully reproduce the empirical correlation properties of the record. Second, we consider a process of long range power-law correlations and demonst...

Ashkenazy, Y. and Tziperman, E.: Are the 41 kyr glacial oscillations a linear response to Milankovitch forcing?, Quat. Sci. Rev., 23, 1879–1890, doi:10.1016/j.quascirev.2004.04.008, 2004.; Cane, M. A. and Zebiak, S. E.: A theory for el nino and the southern oscillation, Science, 228, 1085–1087, 1985.; Delworth, T. L., Manabe, S., and Stouffer, R. J.: Interdecadal variations of the thermohaline circulation in a...

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Elastic Envelope Inversion Using Multicomponent Seismic Data Witho...

By: B. Chi; Y. Liu; L. Dong; C. Huang

Description: State Key Laboratory of Marine Geology, Tongji University, Shanghai 20092, China. Low frequency is a key issue to reduce the nonlinearity of elastic full waveform inversion. Hence, the lack of low frequency in recorded seismic data is one of the most challenging problems in elastic full waveform inversion. Theoretical derivations and numerical analysis are presented in this paper to show that envelope operator can retrieve strong low frequency modulation ...

Baeten, G., de Maag, J. W., Plessix, R. E., Klaassen, R., Qureshi, T., Kleemeyer, M., ten Kroode, F., and Rujie, Z.: The use of low frequencies in a full-waveform inversion and impedance inversion land seismic case study, Geophys. Prospect., 61, 701–711, 2013.; Bunks, C., Saleck, F. M., Zaleski, S., and Chavent, G.: Multiscale seismic waveform inversion, Geophysics, 60, 1457–1473, 1995.; Bozdağ, E., Trampert, J., and Tromp, J.: Misfit functions for full waveform inversio...

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Characteristics of Quasi-static Potential Structures Observed in t...

By: T. Johansson; M. André; S. Buchert; L. M. Kistler; P.-a. Lindqvist; A. Fazakerley; G. T. Marklund; T. Karlsson; S. Figueiredo

Description: Division of Plasma Physics, Alfvén Laboratory, Royal Institute of Technology, SE 10044 Stockholm, Sweden. Temporal and spatial characteristics of intense quasi-static electric fields and associated electric potential structures in the return current region are discussed using Cluster observations at geocentric distances of about 5 Earth radii. Results are presented from four Cluster encounters with such acceleration structures to illustrate common as wel...

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Using Adjoint Sensitivity as a Local Structure Function in Variati...

By: G. Hello; F. Bouttier

Description: Centre National de Recherche de la Météorologie, Météo-France, Toulouse, France. One approach recently proposed in order to improve the forecast of weather events, such as cyclogenesis, is to increase the number of observations in areas depending on the flow configuration. These areas are obtained using, for example, the sensitivity to initial conditions of a selected predicted cyclone. An alternative or complementary way is proposed here...

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Wave Vector Analysis Methods Using Multi-point Measurements : Volu...

By: U. Motschmann; K.-h. Glassmeier; Y. Narita

Description: Institut für Geophysik und extraterrestrische Physik, Technische Universität Braunschweig, Mendelssohnstr. 3, 38106 Braunschweig, Germany. Recent developments of multi-point measurements in space provide a means to analyze spacecraft data directly in the wave vector domain. For turbulence study this means that we are able to estimate energy, helicity, and higher order moments in the wave vector domain without assuming Taylor's hypothesis or axisymmetry a...

Biskamp, D.: Magnetohydrodynamic Turbulence, Cambridge University Press, Cambridge, 2003.; Capon, J.: High resolution frequency-wavenumber spectrum analysis, Proc. IEEE, 57, 1408–1418, 1969.; Balogh, A., Carr, C. M., Acuña, M. H., Dunlop, M. W., Beek, T. J., Brown, P., Fornacon, K.-H., Georgescu, E., Glassmeier, K.-H., Harris, J., Musmann, G., Oddy, T., and Schwingenschuh, K.: The Cluster Magnetic Field Investigation: overview of in-flight performance and initial results...

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A Comparison of Assimilation Results from the Ensemble Kalman Filt...

By: P. Malanotte-rizzoli; X. Zang

Description: Department of Earth, Atmospheric and Planetary Sciences, Massachusetts Institute of Technology, USA. The goal of this study is to compare the performances of the ensemble Kalman filter and a reduced-rank extended Kalman filter when applied to different dynamic regimes. Data assimilation experiments are performed using an eddy-resolving quasi-geostrophic model of the wind-driven ocean circulation. By changing eddy viscosity, this model exh...

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Solitary Wave in a Burridge-knopoff Model with Slip-dependent Fric...

By: Z. L. Wu; Y. T. Chen

Description: Institute of Geophysics, China Seismological Bureau, 100081 Beijing, China. A one-dimensional Burridge-Knopoff spring-block model with slip-dependent friction was studied to explore the possibility of a solitary wave solution existing for the problem of earthquake faulting. The result may be used as an alternative case of the crack model (e.g., Madariaga and Cochard, 1996) and the spring-block model with velocity-dependent friction (e.g., Carlson and La...

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Bistable Systems with Stochastic Noise: Virtues and Limits of Effe...

By: V. Lucarini; D. Faranda; M. Willeit

Description: Klimacampus, Institute of Meteorology, Hamburg Universität, Hamburg, Germany. The understanding of the statistical properties and of the dynamics of multistable systems is gaining more and more importance in a vast variety of scientific fields. This is especially relevant for the investigation of the tipping points of complex systems. Sometimes, in order to understand the time series of given observables exhibiting bimodal distributions, simple one-dime...

Benzi, R., Parisi G., Sutera A., and Vulpiani A.: Stochastic resonance in climatic change, Tellus 34, 10–16, 1982.; Benzi, R.: Stochastic resonance: from climate to biology, Nonlin. Processes Geophys., 17, 431–441, doi:10.5194/npg-17-431-2010, 2010.; Boyle, E. and Kegwin, L.: North Atlantic thermohaline circulation during the past 20,000 years linked to high-latitude surface temperature, Nature, 330, 35–40, 1987.; Ces...

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Variability in Spatial Patterns of Long Nonlinear Waves from Fast ...

By: T. Soomere; K. E. Parnell; I. Didenkulova; T. Torsvik

Description: Bergen Center for Computational Science, UNIFOB, University of Bergen, Thormøhlensgate 55, 5008 Bergen, Norway. High-speed ferries are known to generate wakes with unusually long periods, and occasionally large amplitudes which may serve as a qualitatively new forcing factor in coastal regions that are not exposed to a sea swell. An intrinsic feature of such wakes is their large spatial variation. We analyze the variability of wake conditions for the co...

Belibassakis, K. A.: A coupled-mode technique for the transformation of ship-generated waves over variable bathymetry regions, Appl. Ocean Res., 25, 321–336, 2003.; Didenkulova, I. and Pelinovsky, E.: Run-up of long waves on a beach: the influence of the incident wave form, Oceanology, 48(1), 1–6, 2008.; Didenkulova, I., Zahibo, N., Kurkin, A., Levin, B., Pelinovsky, E., and Soomere, T.: Runup of nonlinearly deformed waves on a coast, Dokl. Earth Sci., 411(8), 1241–1243,...

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Unstable Periodic Orbits and Attractor of the Barotropic Ocean Mod...

By: E. Kazantsev

Description: INRIA-Lorraine, projet NUMATH, Nancy, France. A numerical method for detection of unstable periodic orbits on attractors of nonlinear models is proposed.  The method requires similar techniques to data assimilation.  This fact facilitates its implementation for geophysical models.  This method was used to find numerically several low-period orbits for the barotropic ocean model in a square.  Some numerical particularities of application of this method a...

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Linear and Nonlinear Modulus Surfaces in Stress Space, from Stress...

By: I. B. Santos; K. R. McCall; R. A. Guyer; G. N. Boitnott; M. Boudjema

Description: Department of Physics, University of Nevada, Reno, USA. The elastic response of many rocks to quasistatic stress changes is highly nonlinear and hysteretic, displaying discrete memory. Rocks also display unusual nonlinear response to dynamic stress changes. A model to describe the elastic behavior of rocks and other consolidated materials is called the Preisach-Mayergoyz (PM) space model. In contrast to the traditional analytic ap...

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Verification of Intense Precipitation Forecasts from Single Models...

By: F. Atger

Description: Météo-France, Toulouse, France. The performance of single models and ensemble prediction systems has been investigated with respect to quantitative precipitation forecasts. Evaluation is based on the potential economic value of + 72 h/ + 96 h forecasts. The verification procedure consists of taking into account all precipitation amounts that are predicted in the vicinity of an observation in order to compute spatial, multi-event conti...

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Solitary Waves Observed in the Auroral Zone: the Cluster Multi-spa...

By: M. L. Goldstein; A. Balogh; B. Lavraud; P. M. E. Décréau; O. Santolík; R. Frahm; D. Winningham; Y. Khotyaintsev; L.-j. Chen; D. A. Gurnett; S. W. Kahler; R. L. Huff; J. S. Pickett; M. André; A. Fazakerley; B. T. Tsurutani; G. S. Lakhina; H. Rème

Description: Department of Physics and Astronomy, The University of Iowa, Iowa City, IA, USA. We report on recent measurements of solitary waves made by the Wideband Plasma Wave Receiver located on each of the four Cluster spacecraft at 4.5-6.5RE (well above the auroral acceleration region) as they cross field lines that map to the auroral zones. These solitary waves are observed in the Wideband data as isolated bipolar and tripolar waveforms. Examp...

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The Influence of Convective Current Generator on the Global Curren...

By: V. N. Morozov

Description: Main Geophysical Observatory, Karbysheva 7, St-Petersburg, Russia. The mathematical generalization of classical model of the global circuit with taking into account the convective current generator, working in the planetary boundary layer was considered. Convective current generator may be interpreted as generator, in which the electromotive force is generated by processes, of the turbulent transport of electrical charge. It is shown that the average po...

Frenkel, Y. I.: Theory electric phenomena of atmosphere, L.-M., Gostehizdat (in Russian), 155 p., 1949.; Hays, P. B. and Roble, R. G.: A quasi-static model of global atmospheric electricity. I. Lower Atmosphere, J. Geophys. Res., 84(A7), 3291–3305, 1979.; Holser, R. E. and Saxon, D. S.: Distribution of electrical conduction current in the vicinity of thunderstorm, J. Geophys. Res., 52(2), 207–217, 1952.; Imjanitov, I. M. and Kolokolov, V. P.: Investigations of electric f...

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On the Two-day Oscillations and the Day-to-day Variability in Glob...

By: M. Grygalashvyly; G. R. Sonnemann

Description: Leibniz-Institute of Atmospheric Physics at the University Rostock in Kühlungsborn, D-18225 Ostseebad Kühlungsborn, Germany. The integration of the photochemical system of the upper mesosphere/mesopause region brought evidence that the system is able to respond in a nonlinear manner under certain conditions. Under the action of the diurnally-periodic insolation, the system creates subharmonic oscillations or chaos if disregarding strong diffusion, and un...

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Scaling Statistics in a Critical, Nonlinear Physical Model of Trop...

By: V. K. Gupta; K. M. Nordstrom

Description: C4-CIRES, Univ. Colorado, Boulder, CO, USA. Over the last two decades, concepts of scale invariance have come to the fore in both modeling and data analysis in hydrological precipitation research. With the advent of the use of the multiplicative random cascade model, these concepts have become increasingly more important. However, unifying this statistical view of the phenomenon with the physics of rainfall has proven to be a rather n...

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Nonlinear Wave Effects at the Non-reflecting Beach : Volume 19, Is...

By: E. Pelinovsky; I. Didenkulova

Description: Laboratory of Wave Engineering, Institute of Cybernetics at Tallinn University of Technology, Akadeemia tee 21, 12618 Tallinn, Estonia. Nonlinear effects at the bottom profile of convex shape (non-reflecting beach) are studied using asymptotic approach (nonlinear WKB approximation) and direct perturbation theory. In the asymptotic approach the nonlinearity leads to the generation of high-order harmonics in the propagating wave, which result in the wave b...

Bjorkavag, M. and Kalisch, H.: Wave breaking in Boussinesq models for undular bores, Phys. Lett. A, 375, 1570–1578, 2011.; Bowen, A. J., Inman, D. L., and Simmons, V. P.: Wave set-down and wave set-up, J. Geophys. Res., 73, 2569–2577, 1968.; Carrier, G. F. and Greenspan, H. P.: Water waves of finite amplitude on a sloping beach, J. Fluid Mech., 4, 97–109, 1958.; Dean, R. G. and Dalrymple, R. A.: Coastal processes with engineering applications, Cambridge University Press...

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