Rapid rates of coastal wetland loss in Louisiana are widely recognized. One important question of wetland sustainability is how volumetric contributions of roots to wetland soils vary under the influence of different hydrologic regimes. The research presented here specifically investigates the spatial and temporal relationships among the specific gravity of live roots, soil chemistry, and flooding regime for the macrophyte Spartina alterniflora Loisel. in natural, salt marsh, field settings located across southeastern coastal Louisiana. The results of this research propose the existence of a stress-tolerance threshold (beyond which root specific gravity modifications are observed), and highlight the importance of micro-scale factors over macro-scale regional characteristics in determining environmental stresses and the subsequent impact on root specific gravity. A conceptual model is developed linking the interactions of relevant environmental variables, root specific gravity, and the idea of a stress-tolerance threshold.

This dissertation explores how people frame environmental change. Specifically, this work explores the identity loss that residents of coastal Louisiana experience due to coastal land loss. I rely on 126 in-depth interviews of residents from communities in six coastal parishes (counties). Respondents convey the meanings they give to land loss through constructing a narrative of place. A phenomenological approach is employed that focuses on how stories are told and the subjective interpretations of societal members. First, Louisiana's coastal communities hold a significant attachment to place that in many cases has been developing for close to three centuries. For most residents, place is an inseparable part of identity. Second, Louisiana's coastal land loss is an environmental disaster that causes a heightened awareness of place attachment among residents. Along with a keen awareness of their attachment due to anxiety over land loss, residents believe little is being done to abate that loss. While some erosion and subsidence of the coastal wetlands is natural, much of the loss is caused by human action upon the environment. Communities have watched this mostly slow onset disaster for over fifty years, yet the issue only began receiving significant attention in the last few years of the twentieth century. A third factor contributing to the sense of loss residents experience is their alienation from the bureaucratic and technological processes of coastal restoration. Residents believe that their localized expert knowledge has been dismissed by the institutional expertise of scientific knowledge. Residents say that part of who they are is eroding and they feel helpless and in some respects, prevented from doing anything to alleviate that loss. Exploring the impact of Louisiana's coastal land loss on residents' attachment and identification with place can shed light on the role communities themselves can play in policy and restoration projects. In this regard, the meanings residents' ascribe to places are important for how and what decisions are made concerning those places.

No description available.

<p>This is a case study about the Maasai and their land rights. The Maasai are semi-nomadic pastoralists, living in southern Kenya and northern Tanzania. It is said that they came to this area, now called Maasailand, about 300 years ago. In the beginning, they were independent and free to walk and graze their cattle without limitations and regulations. But when the British and German colonizers of these countries came to Maasailand, they discovered the advantages of its nature and started creating reserves. The Maasai were not strong enough to resist and it resulted in a land loss of two thirds for them. This has forced them to change their livelihood. They have to combine their pastoral lifestyle with other ways to make a living.</p><p>The main purpose with the study is to look at how the land loss has affected the Maasai and their livelihoods. The essay is mainly built on secondary sources, but also on a field work from the Ngorongoro Conservation Area, with qualitative interviews. This is used here, in order to give an example of a conservation area where the Maasai and the wildlife successfully coexist. To be able to understand the changes in Maasai livelihoods, the Sustainable Livelihoods Approach has been adapted. With this approach, a more holistic view of the changes can be made. The land losses have not always brought negative results for the Maasai. They have been able to adapt a multiple livelihood, including pastoralism, agriculture and tourist industry. The Maasai might benefit more by adapting different assets; instead of only rely on one.</p>

During the last half century researchers have suggested that active deformation driven by neotectonic activity has locally influenced areas of southeastern Louisiana in the form of wetland loss and coastal erosion. This study, within the Pearl River Delta Area of Louisiana, applied geomorphologic and stratigraphic methods of analysis to assess whether evidence of recent fault motion is present within the shallow, unconsolidated Holocene strata of the study area. Geomorphological historical change analyses focused on meander patterns, elongated water bodies and spatial changes in vegetation identify areas where fault motion may have recently occurred. The shallow stratigraphy was then investigated in these locations using vibracores and seismic reflection profiling. Facies relationships coupled with radiocarbon ages of select stratigraphic intervals led to the development of a detailed stratigraphic framework. Based on these relationships, data suggest that subsurface deformation, resultant of neotectonic activity, has recently occurred within the shallow, unconsolidated Holocene strata.

St. Bernard Parish (Louisiana) has undergone a transition from rural, agrarian characteristics to that of a suburban, industrial based community. Its fragile environment has been substantially altered by man's use. Planning and development strategies need to be devised to address the stress placed on the environment by these alterations, particularly dealing with coastal erosion, land loss and increased threat of tidal surge and flooding if development in the area is to continue. St. Bernard also faces a changing economy with the declines of its industrial based economy and employment base which requires that new forms of economic development are established to replace jobs those that have been lost. This thesis addresses these issues and proposes actions that could be taken to learn from the errors of the past to attempt to mitigate losses that have occurred by emphasizing planning and arranging priorities to create an agenda for the future which provides economic development and controlled growth within the bounds of Saint Bernard Parish's environmental capacity.

This is a case study about the Maasai and their land rights. The Maasai are semi-nomadic pastoralists, living in southern Kenya and northern Tanzania. It is said that they came to this area, now called Maasailand, about 300 years ago. In the beginning, they were independent and free to walk and graze their cattle without limitations and regulations. But when the British and German colonizers of these countries came to Maasailand, they discovered the advantages of its nature and started creating reserves. The Maasai were not strong enough to resist and it resulted in a land loss of two thirds for them. This has forced them to change their livelihood. They have to combine their pastoral lifestyle with other ways to make a living. The main purpose with the study is to look at how the land loss has affected the Maasai and their livelihoods. The essay is mainly built on secondary sources, but also on a field work from the Ngorongoro Conservation Area, with qualitative interviews. This is used here, in order to give an example of a conservation area where the Maasai and the wildlife successfully coexist. To be able to understand the changes in Maasai livelihoods, the Sustainable Livelihoods Approach has been adapted. With this approach, a more holistic view of the changes can be made. The land losses have not always brought negative results for the Maasai. They have been able to adapt a multiple livelihood, including pastoralism, agriculture and tourist industry. The Maasai might benefit more by adapting different assets; instead of only rely on one.

Southeast Louisiana is susceptible to the impact of subsidence due to natural and anthropogenic processes including sediment compaction and loading, fluid withdrawal, and faulting. Subsidence rates in Southeast Louisiana are higher than anywhere else in the United States, and the impact of subsidence rates on industrial complexes has not been studied. Spatial interpolation methods were analyzed to determine the best fit for subsidence rates and to create a predictive surface for the lower Mississippi River Industrial corridor (LMRIC). Empirical Bayesian kriging, ordinary kriging, universal kriging, and inverse distance weighted interpolation methods were applied to the 2004 National Oceanic and Atmospheric Administration (NOAA) published Technical Report #50 dataset and cross-validation methods were utilized to determine the accuracy of each method. The mean error and root mean square error were calculated for each interpolation method, then used to detect bias and compare the predicted value with the actual observation value. Cross-validation estimates are comparable for each method statistically and visually; however, the results indicate the empirical Bayesian kriging interpolation method is the most accurate of the methods using the lowest mean error and root mean square error scores. Digital elevation models for the years 2025, 2050, and 2075 were developed based on the predictive surface of subsidence rates using the results from the empirical Bayesian kriging interpolation method. Results indicate that by 2025, 31.4% of landmass in the LMRIC will be below 0 m NAVD88, with 40.4% below 0 m NAVD88 by 2050, and 51.8% by 2075. Subsidence rates in the LMRIC range from approximately 16 mm to less than one mm per year. Nine of the 122 industrial complexes located in the LMRIC are estimated to be below 0 m NAVD88 by the year 2075. Limited economic impacts can be inferred based on the number of facilities impacted; however, service disruptions due to subsidence impacting infrastructure surrounding these industrial complexes would have catastrophic economic impacts on a regional, state, and national level.

No description available.

This research investigated the feasibility and benefits of integrating geospatial technology with traditional ecological knowledge (TEK) of an indigenous Louisiana coastal population in order to assess the impacts of current and historical ecosystem change to community viability. The primary goal was to provide resource managers with a comprehensive method of assessing localized ecological change in the Gulf Coast region that can benefit community sustainability. Using Remote Sensing (RS), Geographic Information Systems (GIS), and other geospatial technologies integrated with a coastal community's TEK to achieve this goal, the objectives were (1) to determine a method for producing vulnerability/sustainability mapping products for an ecosystem-dependent livelihood base of a coastal population that results from physical information derived from RS imagery and supported, refined, and prioritized with TEK, and (2) to demonstrate how such an approach can engage affected community residents who are interested in understanding better marsh health and ways that marsh health can be recognized, and the causes of declining marsh determined and addressed. TEK relevant to the project objectives collected included: changes in the flora and fauna over time; changes in environmental conditions observed over time such as land loss; a history of man-made structures and impacts to the area; as well as priority areas of particular community significance or concern. Scientific field data collection measured marsh vegetation health characteristics. These data were analyzed for correlation with satellite image data acquired concurrently with field data collection. Resulting regression equations were applied to the image data to produce estimated marsh health maps. Historical image datasets of the study area were acquired to understand evolution of land change to current conditions and project future vulnerability. Image processing procedures were developed and applied to produce maps that detail land change in the study area at time intervals from 1968 to 2009. This information was combined with the TEK and scientific datasets in a GIS to produce mapping products that provide new information to the coastal restoration decision making process. This information includes: 1) what marsh areas are most vulnerable; and 2) what areas are most significant to the sustainability of the community.