Dissecting the eastern margin of the Tibetan plateau : a study of landslides, erosion and river incision in a transient landscape
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Earth, Atmospheric, and Planetary Sciences, 2007.
| 主要作者: | |
|---|---|
| 其他作者: | |
| 格式: | Thesis |
| 语言: | eng |
| 出版: |
Massachusetts Institute of Technology
2008
|
| 主题: | |
| 在线阅读: | http://hdl.handle.net/1721.1/42276 |
| _version_ | 1826194966486974464 |
|---|---|
| author | Ouimet, William Burke |
| author2 | Kelin X. Whipple and Leigh H. Royden. |
| author_facet | Kelin X. Whipple and Leigh H. Royden. Ouimet, William Burke |
| author_sort | Ouimet, William Burke |
| collection | MIT |
| description | Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Earth, Atmospheric, and Planetary Sciences, 2007. |
| first_indexed | 2024-09-23T10:04:59Z |
| format | Thesis |
| id | mit-1721.1/42276 |
| institution | Massachusetts Institute of Technology |
| language | eng |
| last_indexed | 2024-09-23T10:04:59Z |
| publishDate | 2008 |
| publisher | Massachusetts Institute of Technology |
| record_format | dspace |
| spelling | mit-1721.1/422762019-04-12T09:45:54Z Dissecting the eastern margin of the Tibetan plateau : a study of landslides, erosion and river incision in a transient landscape Ouimet, William Burke Kelin X. Whipple and Leigh H. Royden. Massachusetts Institute of Technology. Dept. of Earth, Atmospheric, and Planetary Sciences. Massachusetts Institute of Technology. Dept. of Earth, Atmospheric, and Planetary Sciences. Earth, Atmospheric, and Planetary Sciences. Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Earth, Atmospheric, and Planetary Sciences, 2007. Includes bibliographical references. The eastern margin of the Tibetan plateau is characterized by large rivers dissecting regional topography that has been uplifted in association with the continued convergence of the Indian subcontinent and Eurasia. In this thesis, I utilize field observations, digital topographic data, cosmogenic isotope data, low-temperature thermochronology and numerical simulations to better understand the evolution of these rivers and tectonics of the region. The goals of this work are: 1) to characterize the rates and processes of river incision and erosion associated with major rivers dissecting the eastern margin; 2) to better understand and constrain the transient landscape evolution that defines regional topography; and 3) to move closer to understanding the relationships among tectonics, topography and erosion that apply directly to the eastern margin, and may be applied to other landscapes around the world. To accomplish these goals, I study the rates and processes of river incision and erosion on the eastern margin on a variety of spatial and temporal scales. I discuss local incision processes and related landforms by exploring the influence of large landslides and discussing epigenetic gorges, which are secondary bedrock-walled channels that form in relation to episodes of river blockage or afgradation. I quantify short-term (102-105 yr) erosion rates using cosmogenic isotopes ( Be) from river sand for 65 small river basins (typically <100 km2) throughout the eastern margin, and long-term (106-107 yr) incision rates using low-temperature thermochronology from elevation transects collected within the Dadu, Yalong, and Yangtze river gorges. (cont) Each short-term, basin-averaged erosion rate represents erosion for a unique subset of eastern margin topography, lying within the context of the large-scale transient morphology of the region; while the long-term incision rates quantify the onset and rates of rapid incision associated with regional scale river response to plateau uplift. All of these datasets combine to provide a valuable example of a large, actively evolving transient river with spatially variable erosion and incision, from which can be drawn implications for regional tectonics and models of river incision and landscape evolution, in general. by William Burke Ouimet. Ph.D. 2008-09-03T15:09:54Z 2008-09-03T15:09:54Z 2007 2007 Thesis http://hdl.handle.net/1721.1/42276 231846981 eng M.I.T. theses are protected by copyright. They may be viewed from this source for any purpose, but reproduction or distribution in any format is prohibited without written permission. See provided URL for inquiries about permission. http://dspace.mit.edu/handle/1721.1/7582 197 p. application/pdf Massachusetts Institute of Technology |
| spellingShingle | Earth, Atmospheric, and Planetary Sciences. Ouimet, William Burke Dissecting the eastern margin of the Tibetan plateau : a study of landslides, erosion and river incision in a transient landscape |
| title | Dissecting the eastern margin of the Tibetan plateau : a study of landslides, erosion and river incision in a transient landscape |
| title_full | Dissecting the eastern margin of the Tibetan plateau : a study of landslides, erosion and river incision in a transient landscape |
| title_fullStr | Dissecting the eastern margin of the Tibetan plateau : a study of landslides, erosion and river incision in a transient landscape |
| title_full_unstemmed | Dissecting the eastern margin of the Tibetan plateau : a study of landslides, erosion and river incision in a transient landscape |
| title_short | Dissecting the eastern margin of the Tibetan plateau : a study of landslides, erosion and river incision in a transient landscape |
| title_sort | dissecting the eastern margin of the tibetan plateau a study of landslides erosion and river incision in a transient landscape |
| topic | Earth, Atmospheric, and Planetary Sciences. |
| url | http://hdl.handle.net/1721.1/42276 |
| work_keys_str_mv | AT ouimetwilliamburke dissectingtheeasternmarginofthetibetanplateauastudyoflandslideserosionandriverincisioninatransientlandscape |