Many landscape evolution models have considered the interaction of exogenic and
endogenic processes. However, geomorphological processes have not been successfully
incorporated in landscape evolution models. The thesis begins with a critical analysis of
methodologies for the study of large-scale geomorphological processes. A framework based on
a generalization of the relevant processes is recommended.
Hillslope and channel submodels, which are based on typical processes operating in
coastal regions of British Columbia, are introduced. The following hillslope processes are
considered: (i) slow, quasi-continuous mass movements; (ii) fast, episodic mass movements; and
(iii) weathering. The transport relation for fast, episodic mass movements was found to be
nonlinear. Fluvial transport in both low and high-gradient channels and debris flow transport are
considered in the channel submodel. A bed load transport equation, which is a revised version of
the Bagnold stream power formula, is derived. Suspended load is calculated using a suspended
load/contributing area correlation. Connections between hillslope and channel processes are
considered to ensure adequate representation in the model.
The hillslope and channel submodels are explored in one-dimensional and surface model
runs for small drainage basins in the Queen Charlotte Islands, British Columbia. Tests of the
fluvial submodel demonstrate the robustness of the bed load equation used in this study. A
conceptualization of the landscape into unstable and stable regimes is introduced. Results of
surface model runs emphasize the key role of low-order channels in transferring sediment from
hillslopes to main channels. The exercise of constructing and running the model highlighted
major gaps in our present understanding of geomorphological process operation and sediment
routing. Suggestions for future research are extensive and are outlined in the concluding chapter
of the thesis.
| Identifer | oai:union.ndltd.org:LACETR/oai:collectionscanada.gc.ca:BVAU.2429/8596 |
| Date | 05 1900 |
| Creators | Martin, Yvonne. |
| Source Sets | Library and Archives Canada ETDs Repository / Centre d'archives des thèses électroniques de Bibliothèque et Archives Canada |
| Language | English |
| Detected Language | English |
| Type | Electronic Thesis or Dissertation |
| Relation | UBC Retrospective Theses Digitization Project [http://www.library.ubc.ca/archives/retro_theses/] |
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