Browsing by Subject "River"
Now showing 1 - 5 of 5
- Results Per Page
- Sort Options
Item I am pouring sweet water on my altar for you : theorizing women of color feminism at the junctures of storm/water, femininity, race and power(2015-05) Gunasena, Natassja Bindu; Tinsley, Omise'eke Natasha, 1971-; Tang, Eric, 1974-This thesis is a meditation on the womanness of water and the wateriness of black and brown womannness. It begins with a consideration of those women that were swept away in the 2004 Boxing Day tsunami in Sri Lanka and those women who were engulfed by the rage of Hurricane Katrina nine months later. As such, this thesis is also a consideration of waterscapes of origin, of the pitfalls and potentials of women of color connecting through, with and as water. It names Yemoja, Oshun, Erzulie, Pattini and Viharamahadevi as theories of water, gender and race developed by women whose lives are "writ in water", and it names them as flesh-and-blood women who wrest/ed meaning from materiality. And finally, this thesis is my own praxis of "crossing", my response to M.Jacqui Alexander's call to "water the plantain shoots" and to remember what we have forgotten we've forgotten. It is a navigation of the waters of women of color feminism, anchored first and always in Black feminism, that hopes to a chart a new future where the bridge isn’t only our back, but our hands, our tongues, and our hearts.Item River : a real-time location system providing indoor positional data acquisition for use in operational improvements within the healthcare environment(2017-12-06) Williams, Gregory Alexander; Julien, Christine, D. Sc.Emergency Department (ED) over-crowding has enormous impact on both patient outcomes and reported satisfaction, costing hospitals thousands of dollars per year. Protocols for increasing efficiency have been proposed with varying justifications. Many consulting firms exist to help ERs identify problems and implement solutions, but no system exists specifically to benchmark all the relevant information in an automated fashion. This report describes such a system using Bluetooth Low Energy (BLE) technology implemented with beacon devices deployed in each area of interest within the ER and mobile applications that will be installed on personnel phones. This system is deployed in a physical setting, with results presented.Item RiverML: a harmonized transfer language for river hydraulic models(2014-08) Jackson, Stephen Robert; Maidment, David R.The multitude of data formats for storing river network, geometry, and flow data presents a challenge for the sharing of information both internally between software applications and externally between agencies. An analysis of existing software applications and data models used for one-dimensional hydraulic modelling of river systems was performed. The commonalities and differences between the model inputs were identified in order to determine the necessary characteristics of a common transfer language. A prototype transfer language was developed using Unified Modeling Language (UML) and implemented as an Extensible Markup Language (XML) schema. This prototype is intended to serve as a first step towards developing an international open standard to facilitate the sharing of hydraulic data. This work was performed in cooperation with the Consortium of Universities for the Advancement of Hydrologic Science, Inc. (CUAHSI) and the Open Geospatial Consortium/World Meteorological Organisation Hydrology Domain Working Group.Item Suspension of bed material over lateral sand bars in the Lower Mississippi River, Southeastern Louisiana(2011-12) Ramirez, Michael Towler; Allison, Mead A. (Mead Ashton); Kim, Wonsuck; Mohrig, DavidUnderstanding specific pathways for sand transport in the lower reaches of large rivers, particularly the Mississippi, is the key to addressing multiple significant geologic problems and for environmental restoration efforts. Field studies were performed in the Mississippi River 75-100 km upstream of the Gulf of Mexico outlet in April 2010 (water discharge: 23,000 m³ s⁻¹), May 2010 (18,500-20,500 m³ s⁻¹), and March 2011 (27,000 m³ s⁻¹) to examine sediment transport phenomena in the river channel. Methods comprised multibeam sonar bathymetric surveys, acoustic Doppler current profiler measurements of current velocity and acoustic backscatter, point-integrated isokinetic suspended sediment sampling, and channel-bed grab sampling. Channel morphology surveys revealed a 30-60 m deep thalweg, alternating between banks every 2-3 km, opposite bedform-covered lateral sand bars. Dune sizes nearest the thalweg ranged from 7 m wavelength and 0.3 m height to over 100 m wavelength and 2.3 m height as a function of water discharge, with decreasing dune sizes towards shallow water. Material comprising the dunes was well-sorted, 125-500 [mu]m sand. Bedload transport rates increased exponentially with water discharge in April 2010 and March 2011 comparable to previous studies in this reach, though rates in May 2011 were well below predicted values for a site (Myrtle Grove) immediately downriver of a sand-mining project. Average water velocities ranged from 1.3 m s⁻¹ in May 2010 to 2 m s⁻¹ in March 2011. Skin-friction shear stress increased with water discharge, but varied over an order of magnitude at all measured discharges. Suspended sand concentration and grain size increased with proximity to the bed during all study periods, and was most pronounced in March 2011. Suspended sand concentrations were greatest over the center of lateral bars, and lowest in the thalweg, indicating that sand transport downstream occurs primarily over lateral sand bars where there is a combination of high shear stress and available bed material. Total bed-material discharge increased exponentially with water discharge. Bedform-induced turbulence may be responsible for the bed material suspension. These results are relevant to coastal restoration efforts by river diversion which seek to distribute sand from the upper water column to deltaic interdistributary wetlands.Item Understanding fluvial topography : morphodynamic processes that build river levees and cut terraces(2021-05-03) Hassenruck-Gudipati, Hima Jennifer; Mohrig, David; Goudge, Timothy A; Hovious, Niels; Lamb, Michael P; Passalacqua, Paola; Rempe, Daniella MFloodplains capture extreme events on a river when water overtops associated riverbanks. As a river migrates, floodplains adapt to feedback in topography, sediment availability, and flow conditions. Describing how floodplains evolve will improve estimates of sediment, organic carbon, and nutrient storage and help predict changes to a stockholder’s river-adjacent land. This dissertation focuses on pathways between a river and its floodplains as terraces form and as natural levees evolve. Terraces form when floodplains are elevated above the active river due to changes in base-level or water to sediment discharge ratios. Natural levees comprise one of several constructional topography styles separating a river channel and its floodplain. As such, levees regulate the exchanges of solids, solutes, and flow between the river and its overbank surface. First-order questions exist about the amount of sediment transported to the floodplain and flow characteristics that natural levees preserve. The improved resolution provided by airborne lidar has enabled systematic studies of terraces formation and natural levees on the coastal Trinity River, Texas, highlighted below. This dissertation analyzes how floodplains are abandoned as terraces and how modern natural levees are formed on floodplains. In Chapter 2, proxies developed to describe both elevation variations and paleo-channel characteristics preserved on late Pleistocene terraces that confine the modern valley. Results show the abandonment mechanism varies for different terrace sets. In the remaining chapters, I combine high-resolution topography measurements, changes observed with repeated measurements, and field observations to quantify natural levee topography and describe how natural levees evolve. I show a first-order morphodynamic correlation between levee crest elevation and river hydraulics and between levee width and topographic floodplain lows. I further show that the percentage of banks with natural levees increases in the most ocean-ward reach. Levee channels are vital in transporting sediment to the levee-floodplain boundary as bedload transport building out into Gilbert-type deltas in standing water. Lastly, I use a framework that integrates across scales from the grain size to the entire >150 km river reach to show how water flow and sediment transport contributes to levee-scale depositional patterns