Despite a breadth of work investigating the spatiotemporal details of fluid dynamics over bedforms and bedload transport dynamics over flat beds, there remains a relative dearth of investigations into the spatiotemporal details of bedload transport over bedforms and on a sub-bedform scale. To address this, we conducted two sets of flume experiments focused on the two fundamental regions of flow associated with bedforms: flow separation/reattachment on the lee side of the bedform (Chapter 1; backward facing-step) and flow reacceleration up the stoss side of the next bedform (Chapter 2; two-dimensional bedform). Using Laser and Acoustic Doppler Velocimetry to record fluid turbulent events and manual particle tracking of high-speed imagery to record bedload transport dynamics, we identified the existence and importance of “permeable splat events” in the region proximal to flow reattachment.
These coupled turbulent and sediment transport events are integral to the spatiotemporal pattern of bedload transport over bedforms. Splat events are localized, high magnitude, intermittent flow features in which fluid impinges on the bed, infiltrates the top portion of bed, and then exfiltrates in all directions surrounding the point of impingement. This initiates bedload transport in a radial pattern. These turbulent structures are primarily associated with quadrant 1 and 4 turbulent structures (i.e. instantaneous fluid fluctuations in the streamwise direction that bring fluid down into the bed in the case of quadrant 1 events, or up away from the bed in the case of quadrant 4 events) and generate a distinct pattern of bedload transport compared to transport dynamics distal to flow reattachment. Distal to flow reattachment, bedload transport is characterized by relatively unidirectional transport. The dynamics of splat events, specifically their potential for inducing significant magnitudes of cross-stream transport, has important implications for the evolution of bedforms from simple, two dimensional features to complex, three-dimensional features.
New advancements in sonar technology have enabled more detailed quantification of bedload transport on the reach scale, a process paramount to the effective management of rivers with sand or gravel-dominated bed material. However, a practical and scalable field methodology for reliably estimating bedload remains elusive. A popular approach involves calculating transport from the geometry and celerity of migrating bedforms, extracted from time-series of bed elevation profiles (BEPs) acquired using echosounders. Using two sets of repeat multibeam sonar surveys from the Diamond Creek USGS gage station in Grand Canyon National Park with large spatio-temporal resolution and coverage, we compute bedload using three field techniques for acquiring BEPs: repeat multi-, single-, and multiple single-beam sonar. Significant differences in flux arise between repeat multibeam and single beam sonar. Mulitbeam and multiple single beam sonar systems can potentially yield comparable results, but the latter relies on knowledge of bedform geometries and flow that collectively inform optimal beam spacing and sampling rate. These results serve to guide design of optimal sampling, and for comparing transport estimates from different sonar configurations.
Human-environment interactions in aeolian (windblown) systems has focused research on<br/>human’s role in causing and aiding recovery from natural and anthropogenic disturbance. There<br/>is room for improvement in understanding the best methods and considerations for manual<br/>coastal foredune restoration. Furthermore, the extent to which humans play a role in changing the<br/>shape and surface textures of quartz sand grains is poorly understood. The goal of this thesis is<br/>two-fold: 1) quantify the geomorphic effectiveness of a multi-year manually rebuilt foredune and<br/>2) compare the shapes and microtextures on disturbed and undisturbed quartz sand grains. For<br/>the rebuilt foredune, uncrewed aerial systems (UAS) were used to survey the site, collecting<br/>photos to create digital surface models (DSMs). These DSMs were compared at discrete<br/>moments in time to create a sediment budget. Water levels and cross-shore modeling is also<br/>considered to predict the decadal evolution of the site. In the two years since rebuilding, the<br/>foredune has been stable, but not geomorphically resilient. Modeling shows landward foredune<br/>retreat and beach widening. For the quartz grains, t-testing of shape characteristics showed that<br/>there may be differences in the mean circularity between grains from off-highway vehicle and<br/>non-riding areas. Quartz grains from a variety of coastal and inland dunes were imaged using a<br/>scanning electron microscopy to search for evidence of anthropogenically-induced<br/>microtextures. On grains from Oceano Dunes in California, encouraging textures like parallel<br/>striations, grain fracturing, and linear conchoidal fractures provide exploratory evidence of<br/>anthropogenic microtextures. More focused research is recommended to confirm this exploratory<br/>work.
The Journal of Surrealism and the Americas: Vol. 2 No. 2 (2008) - Table of Contents
“Surrealism and Photography: Introduction” by Wendy Grossman, p. i-iv.
“‘Surrealistic and disturbing’: Timothy O’Sullivan as Seen by Ansel Adams in the 1930s” by Britt Salvesen, p. 162-179.
“‘As if one’s eyelids had been cut away’: Frederick Sommer’s Arizona Landscapes” by Ian Walker, p. 180-208.
“Clarence John Laughlin, Regionalist Surrealist” by Lewis Kachur, p. 209-226.
“A Swimmer Between Two Worlds: Francesca Woodman’s Maps of Interior Space” by Katharine Conley, p. 227-252.
“Remembering Anne D’Harnoncourt” by Valery Oisteanu, p. 253.
“The 1930s: The Making of the ‘New Man’” by Julia Pine, p. 254-258.
“Beyond Bridges: The Cinema of Jean Rouch” by Robert McNab, p. 259-262.
“Review of Kirby Olson, ‘Andrei Codrescu and the Myth of America’” by Éva Forgács, p. 263-267.
“Review of Sally Price, 'Paris Primitive: Jacques Chirac’s Museum on the Quai Branly’” by Kate Duncan, p. 268-272.
The Journal of Surrealism and the Americas: Vol. 5 No. 1 (2011) - Table of Contents
“Women in the Surrealist Conversation: Introduction” by Katharine Conley, p. i-xiv.
“Temple of the Word: (Post-) Surrealist Women Artists’ Literary Production in America and Mexico” by Georgiana M.M. Colvile, p. 1-18.
“Leonora Carrngton, Mexico, and the Culture of Death” by Jonathan P. Eburne, p. 19-32.
“The Lost Secret: Frida Kahlo and the Surrealist Imaginary” by Alyce Mahon, p. 33-54.
“Art, Science and Exploration: Rereading the Work of Remedios Varo” by Natalya Frances Lusty, p. 55-76.
“Mary Low’s Feminist Reportage and the Politics of Surrealism” by Emily Robins Sharpe, p. 77-97.
“Waste Management: Hitler’s Bathtub” by Laurie Monahan, p. 98-119.
“Kay Sage’s ‘Your Move’ and/as Autobiography” by Elisabeth F. Sherman, p. 120-133.
“Dorothea Tanning and her Gothic Imagination” by Victoria Carruthers, p. 134-158.
“The Colour of My Dreams: The Surrealist Revolution in Art” by Steven Harris, p. 159-161.
‘Alias Man Ray: The Art of Reinvention’: The Jewish Museum, November 15, 2009 - March 14, 2010” by Lewis Kachur, p. 162-167.
“Review of Gail Levin, ‘Lee Krasner: A Biography’” by Sandra R. Zalman, p. 168-171.
The Journal of Surrealism and the Americas: Vol. 8 No. 1 (2014) - Table of Contents
“Manuel Álvarez Bravo: Surrealism and Documentary Photography” by Ian Walker, p. 1-27.
“(Sur)real or Unreal?: Antonin Artaud in the Sierra Tarahumara of Mexico” by Lars Krutak, p. 28-50.
“Surrealist Views, American Landscapes: Notes on Wolfgang Paalen’s Ruin Gazing” by Kent L. Dickson, p. 51-73.
“‘Don’t Forget I Come From the Tropics’: Reconsidering the Surrealist Sculpture of Maria Martins” by Michael R. Taylor, p. 74-89.
“‘Le centre du milieu’: Matta and the Exploding Dome” by Denise Birkhofer, p. 90-104.
“Edward James and Plutarco Gastélum in Xilita: Critical Paranoia in the Mexican Jungle” by Irene Herner, p. 105-123.
“Review of Ellen Landau, ‘Mexico and American Modernism’” by Luis M. Castañeda, p. 124-126.
“‘Surrealist Ghosts and Spectrality in Surrealist Ghostliness’ by Katharine Conley” by Martine Antle, p. 127-129.
“Review of Roger Rothman, ‘Tiny Surrealism: Salvador Dalí and the Aesthetics of the Small’” by Jonathan S. Wallis, p. 130-135.
“Review of ‘Late Surrealism’: The Menil Collection, May 24- August 25, 2013” by Rachel Hooper, p. 136-139.
The Journal of Surrealism and the Americas: Vol. 6 No. 1 (2012) - Table of Contents
“Notes for a Historiography of Surrealism in America, or the Reinterpretation of the Repressed” by Samantha Kavky, p. i-ix.
“What Makes a Collection Surrealist?: Twentieth-Century Cabinets of Curiosities in Paris and Houston” by Katharine Conley, p. 1-23.
“Dalí, Magritte, and Surrealism’s Legacy, New York c. 1965” by Sandra Zalman, p. 24-38.
“‘What Makes Indians Laugh’: Surrealism, Ritual, and Return in Steven Yazzie and Joseph Beuys” by Claudia Mesch, p. 39-60.
“Cracking up an Alligator: Ethnography, Juan Downey’s Videos, and Irony” by Hjorleifur Jonsson, p. 61-86.
“Review of Effie Rentzou, ‘Littérature Malgré Elle: Le Surréalisme et la Transformation du Littéraire’” by Pierre Taminiaux, p. 87-90.
“In Wonderland: the Surrealist Adventures of Women Artists in Mexico and the United States” by Susan L. Aberth, p. 91-94.
“Fantasyland or Wackyland? Animation and Surrealism in 1930s America” by Jorgelina Orfila and Francisco Ortega Grimaldo, p. 1-19.
“El único punto de resistencia: Cultural, Linguistic and Medial Transgressions in the Surrealist Journal VVV” by Andrea Gremels, p. 20-41.
“Chicago Surrealism, Herbert Marcuse, and the Affirmation of the ‘Present and Future Viability of Surrealism’” by Abigail Susik, p. 42-62.
“Surrealist Associations and Mexico’s Precariat in Roberto Wong’s París D.F.” by Kevin M. Anzzolin, p. 63-80.
“Book Review: New Books on Dorothea Tanning” by Katharine Conley, p. 81-83.
“Exhibition Review: ‘Photography and the Surreal Imagination’” by Sandra Zalman, p. 84-89.
“Exhibition Review: ‘Monsters and Myths: Surrealism and War in the 1930s and 1940s’” by Jonathan S. Wallis, p. 86-93
