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UBC Theses and Dissertations
Investigating heinrich events : a continuum model of iceberg drift and sedimentation La Prairie, Douglas I.
Abstract
Records from the North Atlantic reveal high deposition rates of ice-rafted sediments from the Laurentide ice sheet during at least six distinct periods. Known as Heinrich events, these episodes of rapid deposition are attributed to massive iceberg calving promoted by unstable behavior of the ice sheet. The exact mechanisms causing these occurrences of high iceberg flux are not well understood. As a means of elucidating and exploring the freshwater and sediment fluxes associated with Heinrich events, a computer model has been developed which attempts to simulate iceberg drift during these periods of massive calving. This enables reconstruction of the marine sedimentation pattern and provenance-labeled marine core stratigraphy. Using finite-difference methods over a discretized problem domain, the model treats the armada of icebergs as a continuum rather than tracking an ensemble of perhaps thousands of individual trajectories. In this manner the drift of the model icebergs in a multi-layer ocean is governed by advective, diffusive and Coriolis forces as well as being subject to melting. The stochastic nature of iceberg drift is dealt with using a tensorial diffusion coefficient to approximate the effects of heterogeneity, such as different shapes, which strongly influence iceberg drift.
Item Metadata
Title |
Investigating heinrich events : a continuum model of iceberg drift and sedimentation
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Creator | |
Publisher |
University of British Columbia
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Date Issued |
2000
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Description |
Records from the North Atlantic reveal high deposition rates of ice-rafted sediments from
the Laurentide ice sheet during at least six distinct periods. Known as Heinrich events,
these episodes of rapid deposition are attributed to massive iceberg calving promoted
by unstable behavior of the ice sheet. The exact mechanisms causing these occurrences
of high iceberg flux are not well understood. As a means of elucidating and exploring
the freshwater and sediment fluxes associated with Heinrich events, a computer model
has been developed which attempts to simulate iceberg drift during these periods of
massive calving. This enables reconstruction of the marine sedimentation pattern and
provenance-labeled marine core stratigraphy. Using finite-difference methods over a discretized
problem domain, the model treats the armada of icebergs as a continuum rather
than tracking an ensemble of perhaps thousands of individual trajectories. In this manner
the drift of the model icebergs in a multi-layer ocean is governed by advective, diffusive
and Coriolis forces as well as being subject to melting. The stochastic nature of iceberg
drift is dealt with using a tensorial diffusion coefficient to approximate the effects of
heterogeneity, such as different shapes, which strongly influence iceberg drift.
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Extent |
4620431 bytes
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Genre | |
Type | |
File Format |
application/pdf
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Language |
eng
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Date Available |
2009-07-06
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Provider |
Vancouver : University of British Columbia Library
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Rights |
For non-commercial purposes only, such as research, private study and education. Additional conditions apply, see Terms of Use https://open.library.ubc.ca/terms_of_use.
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DOI |
10.14288/1.0089401
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URI | |
Degree | |
Program | |
Affiliation | |
Degree Grantor |
University of British Columbia
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Graduation Date |
2000-05
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Campus | |
Scholarly Level |
Graduate
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Aggregated Source Repository |
DSpace
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Item Media
Item Citations and Data
Rights
For non-commercial purposes only, such as research, private study and education. Additional conditions apply, see Terms of Use https://open.library.ubc.ca/terms_of_use.