On the Formation and Evolution of Axial Fluvial Networks in Dipping, Layered Rocks
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University of Cincinnati / OhioLINK
2021
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| Online Access: | http://rave.ohiolink.edu/etdc/view?acc_num=ucin161374198433671 |
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ndltd-OhioLink-oai-etd.ohiolink.edu-ucin1613741984336712021-10-02T05:10:33Z On the Formation and Evolution of Axial Fluvial Networks in Dipping, Layered Rocks Sheehan, Christopher E. Geology Geomorphic examination of the Tununk and Blue Gate strike valleys on the western flank of the San Rafael Uplift in central Utah provides insights into the formation and evolution of structurally-controlled, axial fluvial networks. These valleys contain knickzones and migrating drainage divides, indicating that they are in a state of fluvial transience as axial stream networks expand outward from larger tributaries of the Colorado River. Terrain analyses and landscape evolution models show that the axial stream expansion rate is sensitive to various antecedent drainage morphologies, regional incision rates, and rock types. Additional landscape evolution models and field observations suggest that the onset of axial catchment expansion may be driven autogenically by the down-dip retreat of different rock layers, and Monte-Carlo simulations informed by field measurements suggest that the autogenic periodicity may overlap with the ~100 kyr timescale of climatic forcing. Cosmogenic 10Be and radiocarbon datasets constrain the onset and average rate of axial catchment expansion at one site in the Tununk Valley, demonstrating that either a climatic or autogenic origin of the catchment is viable. Erosion measurements and remote weather data characterize millimeter-scale geomorphic changes on the migrating divides driven by discrete weather events; these demonstrate that the axial catchment expansion rate is modulated by feedbacks between rill incision during high-intensity rainstorms and regolith creep driven by freeze-thaw cycles and episodic snowmelt. 2021-09-29 English text University of Cincinnati / OhioLINK http://rave.ohiolink.edu/etdc/view?acc_num=ucin161374198433671 http://rave.ohiolink.edu/etdc/view?acc_num=ucin161374198433671 unrestricted This thesis or dissertation is protected by copyright: all rights reserved. It may not be copied or redistributed beyond the terms of applicable copyright laws. |
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NDLTD |
| language |
English |
| sources |
NDLTD |
| topic |
Geology |
| spellingShingle |
Geology Sheehan, Christopher E. On the Formation and Evolution of Axial Fluvial Networks in Dipping, Layered Rocks |
| author |
Sheehan, Christopher E. |
| author_facet |
Sheehan, Christopher E. |
| author_sort |
Sheehan, Christopher E. |
| title |
On the Formation and Evolution of Axial Fluvial Networks in Dipping, Layered Rocks |
| title_short |
On the Formation and Evolution of Axial Fluvial Networks in Dipping, Layered Rocks |
| title_full |
On the Formation and Evolution of Axial Fluvial Networks in Dipping, Layered Rocks |
| title_fullStr |
On the Formation and Evolution of Axial Fluvial Networks in Dipping, Layered Rocks |
| title_full_unstemmed |
On the Formation and Evolution of Axial Fluvial Networks in Dipping, Layered Rocks |
| title_sort |
on the formation and evolution of axial fluvial networks in dipping, layered rocks |
| publisher |
University of Cincinnati / OhioLINK |
| publishDate |
2021 |
| url |
http://rave.ohiolink.edu/etdc/view?acc_num=ucin161374198433671 |
| work_keys_str_mv |
AT sheehanchristophere ontheformationandevolutionofaxialfluvialnetworksindippinglayeredrocks |
| _version_ |
1719486487434625024 |