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Monday, July 27, 2020 | History

2 edition of nonlinear numerical model of the Lake Michigan Lobe, Laurentide Ice Sheet found in the catalog.

nonlinear numerical model of the Lake Michigan Lobe, Laurentide Ice Sheet

John W. Jenson

nonlinear numerical model of the Lake Michigan Lobe, Laurentide Ice Sheet

by John W. Jenson

  • 155 Want to read
  • 35 Currently reading

Published .
Written in English

    Subjects:
  • Ice sheets -- Mathematical models.,
  • Glacial erosion -- Mathematical models.,
  • Sedimentation and deposition -- Mathematical models.

  • Edition Notes

    Statementby John W. Jenson.
    The Physical Object
    Pagination200 leaves, bound. :
    Number of Pages200
    ID Numbers
    Open LibraryOL15204253M

    Under normal circumstances, multiyear modeling of Lake Michigan would require development of some sort of an ice model because the lake is partially covered with ice from De-cember to April. Maximum ice extent is normally observed in late February to early March, when ice covers 45% of Lake Michigan [Assel et al., ]. Fortunately, lack of an. 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.

    Jenson, J.W. Ph.D., , A Nonlinear Numerical Model of the Lake Michigan Lobe, Laurentide Ice Sheet. Currently Professor, Water and Environmental Research Institute, University of Guam. Publications. See Google Scholar Citations, Peter U. Clark. Curry, B.B. and C.H. Yansa. Stagnation of the Harvard sublobe (Lake Michigan lobe) in Northeastern Illinois, USA, f to 17, BP and Subsequent Tundra-like Ice-marginal Paleoenvironments f to 15, BP. Géographie Physique et Quaternaire ABSTRACT.

    Download a Word document of these publications here. Contributions in Glacial Geology, Coastal Geomorphology, Coastal Management, and History By Emeritus Professor David Mickelson, Department of Geoscience, University of Wisconsin-Madison Jones, D.K. and Mickelson, D.M., . The putative Saginaw impact structure, Michigan, Lake Huron, in the light of gravity aspects derived from recent EIGEN 6C4 gravity field model. Journal of Great Lakes Research –] Journal of Great Lakes Research


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Nonlinear numerical model of the Lake Michigan Lobe, Laurentide Ice Sheet by John W. Jenson Download PDF EPUB FB2

A nonlinear numerical model of the Lake Michigan Lobe, Laurentide Ice SheetCited by: 4. A nonlinear numerical model of the Lake Michigan Lobe, Laurentide Ice Sheet Evidence against pervasively deformed bed material beneath rapidly moving lobes of the southern Laurentide Ice Sheet: Sedimentary Geology, Fluctuations of the Lake Michigan Lobe during the late Wisconsin subepisode: Sveriges Geologiska Undersokning.

Title: A Nonlinear Numerical Model of the Lake Michigan Lobe, Laurentide Ice Sheet Abstract approved Peter U. Clark A finite difference flowband model of the Late Wisconsin (ca. 20, years BP) Lake Michigan Lobe (LML) of the Laurentide Ice Sheet has been constructed to investigate how saturated, fine-grained sediment beneath the ice might have.

Download PDF: Sorry, we are unable to provide the full text but you may find it at the following location(s): state. (external link) http Author: Peter U. Clark. We apply a numerical model of the late Wisconsin (ci years B.P.) Lake Michigan Lobe (LML), Laurentide Ice Sheet, to investigate how fine‐grained subglacial sediment might influence lobe b Cited by: A revised chronological framework for the deglaciation of the Lake Michigan lobe of the south-central Laurentide Ice Sheet is presented based on radiocarbon ages of plant macrofossils archived in the sediments of low-relief ice-walled lakes.

We analyze the precision and accuracy of 15 AMS 14C ages of plant macrofossils obtained from a single ice-walled lake deposit. We use a time-dependent two-dimensional ice-flow model to explore the development of the Green Bay Lobe, an outlet glacier of the southern Laurentide Ice Sheet, leading up to the time of maximum.

ELSEVIER Geomorphology 14 () Numerical modeling of advective transport of saturated deforming sediment beneath the Lake Michigan Lobe, Laurentide Ice Sheet John W.

Jenson a, Peter U. Clark b, Douglas R. MacAyeal Carleton Ho d, Julio C. Vela' a Water and Energy Research Institute of the Western Pacific, University of Guam, MangilaoGuam Department of. An ice-profile model assuming plastic behavior in basal till suggests the southern Lake Michigan lobe may have been unusually thin.

Reconstructed Laurentide glacier profiles from the south-west and western Great Plains (South Dakota, Alberta, Minnesota, and Montana), and the MacKenzie Delta, N.W.T., are similar to those inferred for the.

Rapid flow of the Des Moines lobe of the Laurentide ice sheet may have been related to its unlithified substrate. New reconstructions of the lobe, based on moraine elevations, sediment subsidence during moraine deposition, and flow-direction indicators, indicate that the lobe may have been ∼3 times thicker than in previous reconstructions.

The deforming bed model has also been incorporated into two-dimensional numerical simulations of ice-sheet behavior along the Lake Michigan lobe flow line (Clark et al.,Jensen et al.,Jensen et al., ) by assuming no sliding and a viscoplastic behavior of.

Driving stresses, estimated from the geometry of the reconstructed ice surfaces, are kPa for the 14 ka Des Moines Lobe, kPa for the 14 ka James Lobe, kPa for the ka.

[1] Despite the importance of rapidly‐flowing ice streams to ice sheet mass balance, their incorporation into numerical ice sheet models is a major scientific challenge. This introduces large uncertainties in model output and inhibits a more complete understanding of the role of ice streams in overall ice sheet.

Most of the unconsolidated deposits in Berrien County were transported and deposited during the advance and retreat of the Lake Michigan Lobe of the Laurentide ice sheet ~14, yr ago (Stone et al., ). The primary depositional units include: (1) glacial till deposited as a thin layer over the underlying bedrock and as morainal ridges in.

Because ice streams are inherently complex and are subgrid in current numerical models, they have not been portrayed in large-scale ice sheet studies. I employ a continuum mixture framework to incorporate ice streams in a three-dimensional thermomechanical model of the Laurentide Ice Sheet.

The ice mass is composed of a binary mixture of sheet. The Wisconsin Valley and Langlade Lobes of the Laurentide Ice Sheet formed when the southern flank of the Superior Lobe spilled southward over a high bedrock divide and into north-central Wisconsin ().This divide is underlain by early and middle Precambrian volcanic and metasedimentary rock that is part of the Wisconsin dome (Morey et al., ; Mudrey et al., ).

The Laurentide Ice Sheet reached a similar southern extent (around 39 o N) in Missouri during the Early Pleistocene (around Ma) (Balco & Rovey ). However, reliable information regarding the rates of ice sheet advance and retreat, as well as ice sheet thickness is generally limited to the Wisconsin stage of the Pleistocene (Peltier cation of the slightly non-linear viscoplastic behaviour found by Jenson () for sediment samples taken in northern Illinois, about 70 km inside the terminus of the late-Wisconsinan Lake Michigan Lobe of the Laurentide ice sheet.

By adopting a shear-layer thickness of. Beget, J. E.,Modeling the Influence of Till Rheology on the Flow and Profile of the Lake-Michigan Lobe, Southern Laurentide Ice-Sheet, USA: Journal of Glaciology, v.

32, no.p.,Modeling the Influence of Till Rheology on the Flow and Profile of the Lake-Michigan Lobe, Southern Laurentide Ice-Sheet, USA Discussion.

The Lake Michigan and Lake Huron Lobes of the Laurentide Ice Sheet retreated from their TI maximum positions before ± kyr ago and ± kyr 44,45,46,47, respectively. We present different numerical methods for solving the shallow shelf equations with basal drag (SSAB).

An alternative approach of splitting the SSAB equation into a Laplacian and diagonal shift operator is discussed with respect to the underlying eigenvalue problem. First, we solve the equations using standard methods. Then, the coupled equations are decomposed into operators for membranes.Friedman’s seminal book on the consumption theory of the permanent income hypothesis (Friedman ()).

In Friedman’s model, both consumption and income consist of a per-manent component and a transitory component that can arise from measurement errors or genuine fluctuations. The marginal propensity to consume relates the permanent compo.The effect of the subglacial water pressure on the sliding velocity of a glacier in an idealized numerical model.

J. Modeling the subglacial hydrology of the late Pleistocene Lake Michigan lobe, Laurentide Ice Sheet. Geol. Soc. Am. Modeling the subglacial hydrology of the James Lobe of the Laurentide Ice Sheet.

Quat. Sci.