Download or read book A Nonlinear Numerical Model of the Lake Michigan Lobe Laurentide Ice Sheet written by John W. Jenson and published by . This book was released on 1993 with total page 400 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Measuring and Modeling Time Dependent Soil Behavior written by Thomas C. Sheahan and published by . This book was released on 1996 with total page 312 pages. Available in PDF, EPUB and Kindle. Book excerpt: The effects of time on the strength and deformation characteristics of various materials can assume importance in a variety of engineering problems. The time dependent mechanical behavior of soil is highly complex and can impact a broad range of applications such as in situ testing, seismic response, landslides, and embankment performance. This volume provides an update on the state of research and practice in the area of soil time effects. Emphasis is placed on laboratory and field developments, modeling time dependent behavior, rate dependence in a variety of soils, from subtropical soils to subglacial till, and on new applications such as soils reinforced with geosynthetics and inclusion dowels. Models are provided that include the influence of soil structure.
Download or read book Subglacial Hydrology of the Lake Michigan Lobe Laurentide Ice Sheet written by Christopher W. Breemer and published by . This book was released on 2000 with total page 92 pages. Available in PDF, EPUB and Kindle. Book excerpt: Fast ice flow and unstable ice sheet behavior were characteristic features of the Lake Michigan Lobe of the southern Laurentide Ice Sheet. Such behavior may result from some combination of subglacial-sediment deformation and decoupled sliding at the ice-bed interface. Both mechanisms depend on high water pressure relative to ice pressure. Using the finite-difference groundwater modeling package MODFLOW we simulate groundwater flow along a 1,040 km flowline, extending from the south shore of Lake Superior to the Mississippi River near Carbondale, Illinois. Model simulations indicate that subglacial aquifers were not capable of evacuating the estimated basal meltwater. A basal drainage system consisting of a distributed film or canal system, similar to systems hypothesized as underlying Ice Stream B, West Antarctic Ice Sheet, would transmit sufficient water to prevent basal water pressure from exceeding the ice overburden pressure. The buried Mahomet bedrock valley system may have drained enough subglacial meltwater to stop the advance of the Lake Michigan Lobe. Simulations also suggest that groundwater flow directions and velocities were substantially different than modern conditions.
Download or read book Canadian Journal of Earth Sciences written by and published by . This book was released on 2000 with total page 1058 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Bibliography and Index of Illinois Geology 1966 1996 written by Lynne Raymond Martin and published by . This book was released on 2001 with total page 458 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book A GIS based Study of Sedimentation Rates and Sediment Fluxes of the Lake Michigan and Green Bay Lobes of the Southern Laurentide Ice Sheet written by Kelly Jo LaBlanc and published by . This book was released on 2001 with total page 284 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Model of the Western Laurentide Ice Sheet North America written by Evan James Gowan and published by . This book was released on 2015 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Laurentide Ice Sheet reached its maximum extent at the Last Glacial Maximum, 26,500-19,000 years before present. It is responsible for a large portion of the approximately 130 m of eustatic sea level fall since that time. During its retreat, meltwater from the Laurentide Ice Sheet caused rapid changes in sea level, and affected global climate by changing ocean circulation. However, previous estimates of the absolute volume of the Laurentide Ice Sheet through time have been limited due to deficiencies in the chronology of margin retreat and information on glacial-isostatic adjustment (GIA). In this study, I present a new numerical ice sheet model of the western portion of the Laurentide ice sheet. I constrain the model using GIA indicators, including the tilts of well dated glacial lake strandlines, tilt rates of contemporary modern lakes, uplift rates from GPS, and relative sea level indicators. I also present a new margin history based on the minimum timing of retreat. All data used in the modelling exercise are carefully assessed to ensure they are reliable. At the Last Glacial Maximum, the ice sheet model has a broad dome that extended from the Cordillera to the area west of Great Slave Lake, Northwest Territories. The southern portion of the ice sheet is modelled to have a shallow gradient, with thickness values less than 2000 m south of 56 degrees north. This is in contrast to previous ice sheet models of the Laurentide Ice Sheet based on GIA modelling, such as ICE-5G (Peltier, 2004), that have over 5000 m of ice in this region. During deglaciation, the largest decrease in volume happened between 16,000 and 13,000 years before present, coinciding with margin retreat in Alberta and Northwest Territories. From 13,000 to 11,500 years before present, ice sheet retreat slowed, corresponding to Younger Dryas cooling. After 11,500 years before present, ice sheet retreat was more rapid, and by 6500 years before present, no ice remained in the study area. Glacial lake tilt observations support a thick elastic lithosphere, with values greater than 120 km providing the best fit to the data. A wide range of mantle viscosity values were investigated, and the calculated GIA matched observations within the range of 3-5x10̂20 Pa s for the upper mantle and >5x10̂21 Pa s for the lower mantle for the majority of observations.
Download or read book Design Wave Information for the Great Lakes written by Donald T. Resio and published by . This book was released on 1976 with total page 240 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Dissertation Abstracts International written by and published by . This book was released on 1997 with total page 830 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book A Parallel High order Accurate Finite Element Nonlinear Stokes Ice Sheet Model and Benchmark Experiments written by and published by . This book was released on 2012 with total page 24 pages. Available in PDF, EPUB and Kindle. Book excerpt: The numerical modeling of glacier and ice sheet evolution is a subject of growing interest, in part because of the potential for models to inform estimates of global sea level change. This paper focuses on the development of a numerical model that determines the velocity and pressure fields within an ice sheet. Our numerical model features a high-fidelity mathematical model involving the nonlinear Stokes system and combinations of no-sliding and sliding basal boundary conditions, high-order accurate finite element discretizations based on variable resolution grids, and highly scalable parallel solution strategies, all of which contribute to a numerical model that can achieve accurate velocity and pressure approximations in a highly efficient manner. We demonstrate the accuracy and efficiency of our model by analytical solution tests, established ice sheet benchmark experiments, and comparisons with other well-established ice sheet models.
Download or read book Glacio isostasy of the Southern Lake Michigan Basin written by Thomas John Timmermans and published by . This book was released on 1989 with total page 462 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book A NUMERICAL MODEL OF THE LAKE MICHIGAN LAKE BREEZE INCLUDING A REVIEW OF THEORETICAL AND OBSERVATIONAL STUDIES OF COASTAL WIND CIRCULATIONS written by ARTHUR GORDON TINGLE and published by . This book was released on 1971 with total page 163 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book A Numerical Model of the Dynamics of Large Ice Sheets written by James Creevey Hall and published by . This book was released on 1987 with total page 964 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book A Numerical Model of the Wind driven Summer Circulation in Lake Michigan written by Frank D. Malone and published by . This book was released on 1972 with total page 162 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book American Doctoral Dissertations written by and published by . This book was released on 1993 with total page 704 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Glacier Science and Environmental Change written by Peter G. Knight and published by John Wiley & Sons. This book was released on 2008-04-15 with total page 544 pages. Available in PDF, EPUB and Kindle. Book excerpt: Glacier Science and Environmental Change is an authoritative and comprehensive reference work on contemporary issues in glaciology. It explores the interface between glacier science and environmental change, in the past, present, and future. Written by the world’s foremost authorities in the subject and researchers at the scientific frontier where conventional wisdom of approach comes face to face with unsolved problems, this book provides: state-of-the-art reviews of the key topics in glaciology and related disciplines in environmental change cutting-edge case studies of the latest research an interdisciplinary synthesis of the issues that draw together the research efforts of glaciologists and scientists from other areas such as geologists, hydrologists, and climatologists color-plate section (with selected extra figures provided in color at www.blackwellpublishing.com/knight). The topics in this book have been carefully chosen to reflect current priorities in research, the interdisciplinary nature of the subject, and the developing relationship between glaciology and studies of environmental change. Glacier Science and Environmental Change is essential reading for advanced undergraduates, postgraduate research students, and professional researchers in glaciology, geology, geography, geophysics, climatology, and related disciplines.
