Download or read book Fine Scale Ice Dynamics Model for Unconsolidated Sea Ice written by and published by . This book was released on 1981 with total page 227 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Fine Scale Ice Dynamics Model for Unconsolidated Ice written by and published by . This book was released on 1982 with total page 226 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Regional Scale Dynamical Thermodynamical Model for Unconsolidated Sea Ice written by Venkata R. Neralla and published by . This book was released on 1981 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: "The objective of this study is to develop a regional scale sea ice dynamics model for obtaining short range, real time or near-real time predictions of ice conditions for operational use. Hibler's ... dynamic - thermodynamic formulation is modified to suit this objective. The regional-scale model consists of (1) a momentum equation which includes air to ice stress, water to ice stress, Coriolis force, ocean tilt and internal ice resistance, (2) a constitutive law which relates the ice stress to the strain rate and the ice strength and (3) continuity equations for ice thickness and concentration. The continuity equations consider a simple ice thickness distribution which is the same as the one used in Hibler's ... model. An improved thermodynamic formulation for use in the ice thickness distribution is being developed and will be incorporated later into this model. A plastic viscous rheology is used for modelling the ice-ice interaction. Other stresses are parameterized using standard methods. A finite difference numerical procedure is used for solving the equations. The regional ice model is run on a 22 x 22 array with a grid size of 42.3 km and a time step of 3 hours. Model integrations out to 48 hours have been performed and the simulations are compared with data collected during the November/December 1979 Winter Ice Experiment in the Beaufort Sea .... The drift comparisons show the simulated velocities and observed drift to be in reasonable agreement especially considering that errors due to poorly resolved wind and water currents can be substantial. A number of sensitivity and model sophistication tests are planned to further validate the model and the results from it"--Leaf iii.
Download or read book IUTAM Symposium on Scaling Laws in Ice Mechanics and Ice Dynamics written by J.P. Dempsey and published by Springer Science & Business Media. This book was released on 2013-04-18 with total page 479 pages. Available in PDF, EPUB and Kindle. Book excerpt: This Volume constitutes the Proceedings of the IUTAM Symposium on 'Scaling Laws in Ice Mechanics and Ice Dynamics', held in Fairbanks, Alaska from 13th to 16th of June 2000. Ice mechanics deals with essentially intact ice: in this discipline, descriptions of the motion and deformation of Arctic/ Antarctic and river/lake ice call for the development of physically based constitutive and fracture models over an enormous range in scale: 0.01 m - 10 km. Ice dynamics, on the other hand, deals with the movement of broken ice: descriptions of an aggregate of ice floes call for accurate modeling of momentum transfer through the sea/ice system, again over an enormous range in scale: 1 km (floe scale) - 500 km (basin scale). For ice mechanics, the emphasis on lab-scale (0.01 - 0.5 m) research con trasts with applications at the scale of order 1 km (ice-structure interaction, icebreaking); many important upscaling questions remain to be explored.
Download or read book Dynamics of Snow and Ice Masses written by Samuel C. Colbeck and published by Elsevier. This book was released on 2012-12-02 with total page 479 pages. Available in PDF, EPUB and Kindle. Book excerpt: Dynamics of Snow and Ice Masses gives an outline of snow and ice studies with an emphasis on essential properties and processes. The monograph also treats the dynamical aspects of snow and ice masses. The text covers topics such as the flow and temperature of ice sheets and shelves, the numerical modeling of ice-sheet changes; the structure of glaciers, the experimental creep behavior of ice, flow law of glacier ice, and advance and retreat of glaciers. Also covered are topics such as sea ice - the physics of its growth, drift, and decay; iceberg deterioration, sources, drift, and drift patterns; and freshwater ice growth, motion, and decay. The book is recommended as a textbook for graduate-level students of snow and ice studies and as reference for climatologists.
Download or read book Arctic Sea Ice Dynamics written by Torge Martin and published by . This book was released on 2007 with total page 254 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Ice Dynamics written by William D. Hibler and published by . This book was released on 1984 with total page 68 pages. Available in PDF, EPUB and Kindle. Book excerpt: This monograph reviews essential aspects of sea ice dynamics on the geophysical scale and discusses the role of ice dynamics in air-sea-ice interaction. The review is divided into the following components: (a) a discussion of the momentum balance describing ice drift, (b) an examination of the nature of sea ice rheology on the geophysical scale, (c) an analysis of the relationship between ice strength and ice thickness characteristics, and (d) a discussion of the rle of ice dynamices in the atmosphere-ice-ocean system. Because of the unique, highly nonlinear nature of sea-ice interaction, special attention is given to the ramifications of ice interaction on sea ice motion and deformation. These ramifications are illustrated both by analytic solution and by numerical model results. In addition, the role of ice dynamics in the atmosphere-ice-ocean system is discussed in light of numerical modeling experiments, including a fully coupled ice-ocean model of the Arctic-Greenland-Norwegian seas.
Download or read book Numerical Modeling of Sea Ice Dynamics and Ice Thickness Characteristics written by William D. Hibler and published by . This book was released on 1985 with total page 64 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The Drift of Sea Ice written by Matti Leppäranta and published by Springer Science & Business Media. This book was released on 2007-03-06 with total page 282 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book presents the fundamental laws of sea ice drift, as derived from the material properties of sea ice, the basic laws of mechanics, and the latest modeling techniques. Topics covered include the science of sea ice drift, forecasting velocity based on volume, size and shape, sea ice ridging and remote sensing, modelling of ice conditions, and the role of sea ice drift in oceanography, marine ecology and engineering.
Download or read book Constitutive Laws for Sea Ice Dynamics Models written by and published by . This book was released on 1997 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: The long term goal of my research is to develop sea ice dynamics models that describe behavior on kilometer scales and larger, and to base these models on the smaller scale physical processes known to control leading, rafting, and ridging. Three objectives were (1) to continue development of the new anisotropic plasticity constitutive law for large scale sea ice behavior, (2) to analyze data from controlled-load tests conducted during SIMI, and (3) to formulate constitutive laws and solution methods a heterogeneous multiscale material using micromechanics of random media.
Download or read book Ice Dynamics written by William D. Hibbler (III.) and published by . This book was released on 1984 with total page 61 pages. Available in PDF, EPUB and Kindle. Book excerpt: This monograph reviews essential aspects of sea ice dynamics on the geophysical scale and discusses the role of ice dynamics in air-sea-ice interaction. The review is divided into the following components: (a) a discussion of the momentum balance describing ice drift, (b) an examination of the nature of sea ice rheology on the geophysical scale, (c) an analysis of the relationship between ice strength and ice thickness characteristics, and (d) a discussion of the rle of ice dynamices in the atmosphere-ice-ocean system. Because of the unique, highly nonlinear nature of sea-ice interaction, special attention is given to the ramifications of ice interaction on sea ice motion and deformation. These ramifications are illustrated both by analytic solution and by numerical model results. In addition, the role of ice dynamics in the atmosphere-ice-ocean system is discussed in light of numerical modeling experiments, including a fully coupled ice-ocean model of the Arctic-Greenland-Norwegian seas.
Download or read book An Elastic viscous plastic Model for Sea Ice Dynamics written by and published by . This book was released on 1996 with total page 25 pages. Available in PDF, EPUB and Kindle. Book excerpt: The standard model for sea ice dynamics treats the ice pack as a viscous-plastic material that flows plastically under typical stress conditions but behaves as a linear viscous fluid where strain rates are small and the ice becomes nearly rigid. Because of large viscosities in these regions, implicit numerical methods are necessary for timesteps larger than a few seconds. Current solution methods for these equations use iterative relaxation methods, which are time consuming, scale poorly with mesh resolution, and are not well adapted to parallel computation. To remedy this, we have developed and tested two separate methods. First, by demonstrating that the viscous-plastic rheology can be represented by a symmetric, negative definite matrix operator, we have implemented the faster and better behaved preconditioned conjugate gradient method. Second, realizing that only the response of the ice on time scales associated with wind forcing need be accurately resolved, we have modified the model to reduce to the viscous-plastic model at these time scales; at shorter time scales the adjustment process takes place by a numerically efficient elastic wave mechanism. This modification leads to a fully explicit numerical scheme which further improves the computational efficiency and is an advantage for implementations on parallel machines. Furthermore, we observe that the standard viscous-plastic model has poor dynamic response to forcing on a daily time scale, given the standard time step (1 day) used by the ice modeling community. In contrast, the explicit discretization of the elastic wave mechanism allows the elastic-viscous-plastic model to capture the ice response to variations in the imposed stress more accurately. Thus, the elastic-viscous-plastic model provides more accurate results for shorter time scales associated with physical forcing, reproduces viscous-plastic model behavior on longer time scales, and is computationally more efficient. 49 refs., 13 figs., 6 tabs.
Download or read book Modelling Large scale Sea ice Dynamics written by Eckhard Kleine and published by . This book was released on 1994 with total page 23 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Dynamics of the Coupled Ice ocean System in the Marginal Ice Zone written by Sirpa Häkkinen and published by . This book was released on 1984 with total page 124 pages. Available in PDF, EPUB and Kindle. Book excerpt: This study is aimed at the modelling of mesoscale processes such as up/downwelling and ice edge eddies in the marginal ice zones. A 2-dimensional coupled ice-ocean model is used for the study. The ice model is coupled to the reduced gravity ocean model (f-plane) through interfacial stresses. The constitutive equations of the sea ice are formulated on the basis of the Reiner-Rivlin theory. The internal ice stresses are important only at high ice concentrations (90-100%), otherwise the ice motion is essentially free drift, where the air-ice stress is balanced by the ice-water stress. The model was tested by studying the upwelling dynamics. Winds parallel to the ice edge with the ice on the right produce upwelling because the air-ice momentum flux is much greater than air-ocean momentum flux, and thus the Ekman transport is bigger under the ice than in the open water. The upwelling simulation was extended to include temporally varying forcing, which was chosen to vary sinusoidally with 4 day period. This forcing resembles successive cyclone passings. In the model with thin oceanic upper layer, ice bands were formed. The up/downwelling signals do not disappear in wind reversals because of nonlinear advection. This leads to convergences and divergences in oceanic and ice velocities which manifest themselves as ice banding. At least one wind reversal is needed to produce one ice band.
Download or read book Port and Ocean Engineering Under Arctic Conditions written by William M. Sackinger and published by Fairbanks, Alaska : Geophysical Institute, University of Alaska Fairbanks. This book was released on 1988 with total page 720 pages. Available in PDF, EPUB and Kindle. Book excerpt: 122 papers were presented during 14 sessions: Arctic database; Ice properties; Icebreaking vessels; Ice modelling; Arctic port design; Geotechnical; Ice-structure interaction; Ice morphology; Ice dynamics; Ice, climate and forecasting; Spray ice; Remote sensing; and 2 special symposia on Noise and marine mammals, and Steel/concrete composite structural systems.
Download or read book Numerical Modeling of Sea Ice Dynamics and Ice Thickness Characteristics written by William D. Hibler (III.) and published by . This book was released on 1985 with total page 59 pages. Available in PDF, EPUB and Kindle. Book excerpt: A dynamic-thermodynamic sea ice model is extended to include a full thermodynamic code and a complete multilevel ice thickness distribution. The variable thickness formulation includes a more realistic parameterization of ice ridging than used in previous models. Seasonal simulations have been performed using this model and the results have been analyzed with particular emphasis on examination of the ridge buildup results off the Canadian Archipelago and off the North Slope. This report presents a complete description of this model and discusses progress made on examining and testing the variable thickness extensions. Originator supplied keywords: Arctic Basin ice cover, Arctic Ocean, Mathematic models, Sea ice, Simulation modeling.
Download or read book On the consistent scaling of terms in the sea ice dynamics equation written by W.M. CONNOLLEY and published by . This book was released on 2004 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
