Free-surface dynamics in the presence of submerged canopies
Abstract/Contents
- Abstract
- Seagrasses modify the flow of fluid through and around them at many scales and can completely alter their surrounding fluid environment. This thesis focuses on two cases of the hydrodynamics of canopies in the presence of free surfaces: first, on the free-surface expression of a canopy-generated shear instability; and second, on the role of vegetation in coastal protection in wave-dominated regions. In the first portion, I focus on a new tool and hydrodynamic framework for the remote detection and characterization of submerged ecosystems. Coherent fluid structures shed by the canopy impact the water surface; in the laboratory, we obtained snapshots of the water surface slope over time, showing the emergence of these vortices at the water surface, their propagation downstream, and the length scale of the structures. This imaging method was then used in conjunction with subsurface velocity measurements to make connections between the free surface and interior flow properties, suggesting that a canopy leaves a signature on the water surface that is indicative both of what is beneath the water surface, as well as how it is altering the flow. The final portion of this thesis details laboratory experiments studying the protective benefits of coastal vegetation in altering undertow, turbulence, and free-surface behavior on a sloping beach. Vegetation can redirect or attenuate the undertow current and reduce wave-induced cross-shore transport of turbulent kinetic energy (TKE), suggesting that vegetation may help retain sediment onshore in coastal areas.
Description
| Type of resource | text |
|---|---|
| Form | electronic resource; remote; computer; online resource |
| Extent | 1 online resource. |
| Place | California |
| Place | [Stanford, California] |
| Publisher | [Stanford University] |
| Copyright date | 2018; ©2018 |
| Publication date | 2018; 2018 |
| Issuance | monographic |
| Language | English |
Creators/Contributors
| Author | Mandel, Tracy L | |
|---|---|---|
| Degree supervisor | Koseff, Jeffrey Russell | |
| Thesis advisor | Koseff, Jeffrey Russell | |
| Thesis advisor | Ouellette, Nicholas (Nicholas Testroet), 1980- | |
| Thesis advisor | Suckale, Jenny | |
| Degree committee member | Ouellette, Nicholas (Nicholas Testroet), 1980- | |
| Degree committee member | Suckale, Jenny | |
| Associated with | Stanford University, Civil & Environmental Engineering Department. |
Subjects
| Genre | Theses |
|---|---|
| Genre | Text |
Bibliographic information
| Statement of responsibility | Tracy L. Mandel. |
|---|---|
| Note | Submitted to the Civil and Environmental Engineering Department. |
| Thesis | Thesis Ph.D. Stanford University 2018. |
| Location | electronic resource |
Access conditions
- Copyright
- © 2018 by Tracy Mandel
- License
- This work is licensed under a Creative Commons Attribution Non Commercial 3.0 Unported license (CC BY-NC).
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