This study investigates the hydrologic effects of urbanization in two Portland, Oregon streams through a comparison of three hydrologic metrics. Hydrologic metrics used in this study are the mean annual runoff ratio (Qa), mean seasonal runoff ratio (Qw and Qd), and the fraction of time that streamflow exceeds the mean streamflow during the year (TQmean). Additionally, the relative change in streamflow in response to storm events was examined for two watersheds. For this investigation urban development is represented by two urbanization metrics: percent impervious and road density. Descriptive and inferential statistics were used to evaluate the relationship between the hydrologic metrics and the amount of urban development in each watershed. The effect of watershed size was also investigated using nested watersheds, with watershed size ranging from 6 km2 to 138km 2. The results indicate that annual and seasonal runoff ratios have difficulty capturing the dynamic hydrologic behavior in urban watersheds. TQmean was useful at capturing the flashy behavior of the Upper Fanno watershed, however it did not perform as well in Kelley watershed possibly due to the influence of impermeable soils and steep slopes. Unexpected values for hydrologic metrics in Lower Johnson, Sycamore and Kelley watersheds could be the result water collection systems that appear to route surface water outside of their watersheds as well as permeable soils. Storm event analysis was effective at characterizing the behavior for the selected watersheds, indicating that shorter time scales may best capture the dynamic behavior of urban watersheds.

By the early 20th century, in 1920, Black farmers owned 14% of US farmland. Today, in the 21st century, Black farmers own less than 2% of US farmland. The demise of Black farmers and Black farmland in US Agriculture is a direct result of social, political, and racial weaponization against their foodways, culture, and livelihoods. The history concerning the plight of Black farmers goes beyond USDA's historical discrimination but enters a position where racism is embedded and perpetuated within the structure of US agriculture. In effect, Black small-scale farmers have reaped the downfall of this system, enduring racial biases and a complex relationship to the land for future generations. This dissertation examines and investigates the contemporary challenges associated with Mississippi’s small-scale Black farmers and their strategies that resist these challenges to create a self-sufficient agricultural system. Employing a qualitative approach using 31 semi-structured interviews and 4 focus groups discussions, in total of 87 persons, this research studies barriers and resilience strategies by amplifying the voices of small-scale Black farmers across Mississippi. This work draws from previous scholarship in institutional racism, colorblind racism, Black agrarianism, community based organizations, food sovereignty, and Black geographies. Findings indicate that racism still undermines Black farmers in agriculture. Still, they resist and combat these barriers by becoming powerful agents that bring catalyst change in the form of community togetherness and self-sufficiency.

<p>This dissertation draws on a broad range of postcolonial literature in order to explore literary representations of environmentalism in the global South. Although this project draws heavily on the particular environmental histories of different nations and geographic regions, I am also interested in areas of overlap. In this study I do two interrlated and simultaneous things that I hope will refine postcolonial ecocriticism. The first involves a broadening of the definition of 'environment,' informed by the environmental justice movment, in ways that make it more applicable and accountable to people's lived lives. This expanded definition of the environment includes those spaces where people live and work. Such a redefinition, I argue, is a crucial counter-measure to ecocriticism's Anglo-American focus, where traditional American environmental values of conservation, preservation, and the cult of the wilderness prevail. The second intervention involves using ecocriticism alongside this expanded notion of the environment to unearth the everyday environmentalisms at work in postcolonial literature that may go unnoticed through traditional ecocritical approaches. I argue that this everyday approach successfully avoids some of the common hurdles in postcolonial ecocriticism. These hurdles include debates over the origins of environmental thought, questions about the link between affluence and environmental consciousness, and the contentious space of animals in postcolonial thought and literature. By beginning with an examination of the ways in which people interact with their own local environments, I am able to explore environmental thought and action on the ground and can begin theorizing there. What is revealed through these analyses is that this expanded definition of environmentalism and this new ecocritical approach open the door to viewing environmentality as a common and foundational feature of postcolonial literature. My chapters explore various facets of these everyday environmentalisms, including ecofeminist perspectives, anthropocentric versus biocentric representations of the environment, urban space, and finally the idea of going back to the land. The issues that I explore throughout these chapters include legacies of colonialism, globalization, racism and speceism, ecolocial/ecocritical imperialism, and postcoloniality.</p> / Doctor of Philosophy (PhD)

The perception that wildfires are completely preventable has caused many structures and communities to be built in locations that will inevitably experience an uncontrollable fire event, risking human lives and infrastructure. Modification of built environments into fire-adapted communities has been explored in this thesis, through multiple strategies. Central to this analysis is the idea that sustainable human developments could adopt a form of biomimicry and indigenous design informed by the adaptions of plants, animals, and native groups that endure and even thrive with regular cycles of fire. This possibility has been assessed through the scope of fire adaptation strategies available to architects, builders, and urban planners. Design decisions including the strategic placement of buildings in relation to topography, wind, vegetation type, and fuel loads has been considered. Additionally, other mechanisms for adaptation have been assessed, such as fire-retardant building materials, building form, landscaping, and the density of built form on the scale of single homes, and broader communities. The thesis identifies a typical building site, the adjacent community, the potential threats to landscape and buildings posed by wildfire, and then explores design approaches aimed at improving fire adaptability. These factors have been considered and assessed on a qualitative level and offer new recommendations for building within fire zones. These design ideas and principles can then be applied to a variety of landscapes wherein the wildfire is inevitable, thereby exploring how fire-adapted communities may be built to sustain wildfires through a myriad of methods within a range of regions.

The threat of global climate change increasingly influences the actions of human society. As world leaders have negotiated adaptation strategies over the past couple of decades, a certain discourse has emerged that privileges Western conceptions of environmental degradation. I argue that this framing of climate change inhibits the successful implementation of adaptation strategies. This thesis focuses on a case study of the Maldives, an island nation deemed one of the most vulnerable locations to the impacts of rising sea levels. I apply a postcolonial theoretical framework to examine how differing knowledge systems can both complement and contradict one another. By analyzing government-enforced relocation policies in the Maldives, I find that points of contradiction between Western and indigenous environmental epistemologies can create opportunities to bridge the gap between isolated viewpoints and serve as moments to resist the dominant climate change discourse.

The purpose of this dissertation is to examine the experiences of St. Bernard Parish, La., residents as they coped with the impact of the catastrophe of Hurricane Katrina on August 29, 2005. An estimated 50,000 St. Bernard Parish residents relocated to a new home one year after Katina in 2006, and many of those residents moved again. This study examines the effects of the decisions of St. Bernard residents to relocate or to return on their social connections. The utility, adaptability and durability of social networks of these residents will be explored to enrich our knowledge about the social effects of recovery and the role that distance plays in the way residents connect to each other six years after Hurricane Katrina. It also examines the applicability of disaster theory as it relates to this case and develops a methodology for examining the impact of geographic dispersal on social networks.

Before the creation of Mammoth Cave National Park, this area was home to numerous communities, each with a sense of identity. To prepare for the creation of the National Park, all residents living within these communities were relocated, and many of these communities were lost to the passage of time. Today, public memory of these lost communities is being fostered by the descendents of the pre-park area. Through the use of a Historical Geographic Information System, 1920 Edmonson County manuscript census data, and statistical analysis, the demographic composition of these lost communities was explored. This project not only brought to light a past that is not well known, but also built interest in sustaining public memory of the Mammoth Cave pre-park area through the use of historical GIS and public participation.

This thesis enters the context of smallholder agriculture communities in the developing world. It explores the potentials of biochar and what biochar systems could bring to the smallholder communities while simultaneously bringing environmental benefits. It then acknowledges the challenges of diffusion –the spreading of an unfamiliar innovation. It seeks to answer the question of what will make diffusion of biochar systems more successful in the smallholder context, fixating on the characteristic of compatibility as well as the role local community members can play in making a new biochar system more visible to the rest of the communities.

While much attention has been given to the ways local communities may be impacted by climate change, this dissertation focuses ethnographically on the local agencies decision-making processes, a less-studied aspect of this topic. The primary purpose of this dissertation research is to understand how government agencies in southern Florida integrate climate change into their decision-making processes while dealing with political resistance. This research expands our understanding on the cultural politics of a new kind of environmental change, where national and international climate-change politics is brought into local water politics to illuminate how new and not so new visions about life in the contemporary metropolis collide and collude. Using multiple research methods including ethnographic fieldwork, participant observation, semi-structured interviews, and document research, I analyze the activities of the Miami-Dade County Climate Change Advisory Task Force Committee (MDC-CCATF) as well as the water management practices of the regional water management agency, the South Florida Water Management District (SFWMD). My findings include the following: (1) the Task Force activities have spearheaded Miami’s institutional adaptation to climate change; (2) historic legacies have expanded and complicated decision-making processes at the District; (3) a focus on the certainties of climate-change science allows climate change to persist in politically contentious planning contexts. My dissertation concluded that while planning for potential climate-change impacts can be difficult due to multiple institutional constraints that resource agencies like the District have, scientists and policy-makers have crafted an innovative culture that is particularly visible at sites where science and decision making intersect.

Tidal marshes serve as important “blue carbon” ecosystems that accrete large amounts of carbon with limited area. While much attention has been paid to the spatial variability of sedimentation within salt marshes, less work has been done to characterize spatial variability in marsh carbon density. Driven by tidal inundation, surface topography, and sediment supply, soil properties in marshes vary spatially with several parameters, including marsh platform elevation and proximity to the marsh edge and tidal creek network. We used lidar to extract these morphometric parameters from tidal marshes to map soil organic carbon (SOC) at the meter scale. Fixed volume soil samples were collected at four northeast U.S. tidal marshes with distinctive morphologies to aid in building our predictive models. Tidal creek networks were delineated from 1-m resolution topo-bathy lidar data using a semi-automated workflow in GIS. Sample distance to tidal creeks and flow distance to the marsh edge were then determined. Log-linear multivariate regression models were developed to predict soil organic content, bulk density, and carbon density as a function of these predictive metrics at each site and across sites. Results show that modeling salt marsh soil characteristics with morphometric inputs works best in marshes with simple, single creek morphologies. Distance from tidal creeks was the most significant model predictor. Addition of distance to the inlet and tidal range as regional metrics significantly improves cross-site modeling. Our process-based approach results in predicted total marsh carbon stocks comparable to previous studies but provides trade-offs to existing simplistic carbon mapping methods. Further, we provide motivation to continue rigorous mapping of soil carbon at fine spatial resolutions and to use these results to guide salt marsh restoration projects and aid in the development of carbon markets.