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Lateral Channel Confinement, Tributaries, and Their Impact on Channel Morphology
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| 자료유형 | 학위논문 |
|---|---|
| 서명/저자사항 | Lateral Channel Confinement, Tributaries, and Their Impact on Channel Morphology. |
| 개인저자 | Zettler-Mann, Aaron. |
| 단체저자명 | University of Oregon. Department of Geography. |
| 발행사항 | [S.l.]: University of Oregon., 2019. |
| 발행사항 | Ann Arbor: ProQuest Dissertations & Theses, 2019. |
| 형태사항 | 153 p. |
| 기본자료 저록 | Dissertations Abstracts International 81-04B. Dissertation Abstract International |
| ISBN | 9781088304846 |
| 학위논문주기 | Thesis (Ph.D.)--University of Oregon, 2019. |
| 일반주기 |
Source: Dissertations Abstracts International, Volume: 81-04, Section: B.
Advisor: Fonstad, Mark. |
| 이용제한사항 | This item must not be sold to any third party vendors. |
| 요약 | Humans have had a ubiquitous influence on fluvial systems worldwide (Wohl, 2013). Landscape modifications such as lateral channel confinement and flow modifications frequently result in changes to channel morphology including width, depth, channel slope, unit stream power, and particle size distributions (PSD). Morphologic changes can be directly measured, but may also be reflected in the patterns of water surface roughness. This research builds on downstream hydraulic geometry (Leopold and Maddock, 1953) and the sediment links concept (Rice, 1998) to examine anthropogenic and natural controls on channel form across spatial scales. It also develops a method for mapping water surfaces with the same resolution we measure channel form.This research examines how anthropogenic and natural mechanisms control channel form along a 200-kilometer section of the Rogue River in Southern Oregon. I use a combination of remote sensing and field data to create a hyperscale data set containing width, slope and depth data. I use Structure-from-Motion to create particle size distributions for all exposed gravel bars in the study area. With these data I conducted a number of non-parametric statistical analysis to examine how natural and anthropogenic forces influence longitudinal trends in channel morphology.I find that the Rogue River is a highly heterogenous river. At basin-wide scales it does not conform to our traditional views of downstream hydraulic geometry. At smaller spatial scales, the role of local geology triggers an alteration between the commonly observed trends in downstream hydraulic geometry and trends that do not match theory. At scales of 10s of kilometers anthropogenic controls on channel form trigger statistically significant modification of channel form as compared to natural channel reaches. Tributary and non-tributary sediment sources do not consistently result in a statically significant change to channel morphology. However, evidence of persistent delivery of sediment through alluvial and colluvial processes does appear to play an important role in channel morphology. This research supports the claim that intensive and extensive data collection of fluvial systems will further out understanding of how external and autogenic processes control channel morphology |
| 일반주제명 | Geomorphology. |
| 언어 | 영어 |
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: 이 자료의 원문은 한국교육학술정보원에서 제공합니다. |
