This study investigates pine heights by age for actively managed stands in the southeastern U.S. using ICESat-2 ATL08-derived height data and maps derived from the Landsat time series. We intersected ICESat-2 ground tracks with locations of pine plantations and the Landscape Change Monitoring System (LCMS) Fast Loss product to identify previously clear-cut pine plantations. We subtracted the LCMS Fast Loss year from the date of the ICESat-2 acquisition to determine plantation age at the time of the height measurement. We stratified the data for management intensity, where stands that experience both thinning and harvesting were considered actively managed. The goal was to develop age-height relationships across the region to characterize better the impact of management on productivity and site index. This research involved the analysis of over 137,998 ICESat-2 ATL08 segments in actively managed pine stands in the U.S. Southeast. We compared a subset of ICESat-2 heights with heights derived from airborne laser scanning acquisitions (ALS) available through the USGS 3D Elevation Program. The resulting R2 was 0.82, giving us confidence in the ICESat-2 ATL08-derived forest heights. Then, through data processing and analysis, we successfully stratified the spatial patterns of ICESat-2 ATL08 heights in the southeastern region. These patterns provided insights into the distribution and variability of forest heights across the region, contributing to informed decisions in forest management. We identified some challenges in predicting pine stand age through Landsat-derived disturbance products. We found that LCMS Fast Loss labels some heavy thins as a ‘Fast Loss,’ in addition to stand-clearing disturbances like clear-cuts, adding noise to our estimation of stand age. To overcome this issue, we employed a robust model of the logarithm of heights with a reciprocal of age using a random sample consensus (RANSAC) model to calculate site indices at base age 25 (years). Our results showed the site index for the region at a base age of 25 years is 20.1 m with a model R2 of 0.91. We compared the ICESat-2-derived site index with the FIA-derived site index to see the robustness of our results. Then, the modeled site index values were used to produce a map at a base age of 25 years for the U.S. Southeast, offering insights into spatial differences in regional forest productivity. The results of this study have important implications for ecological research, forest management, and well-informed decision-making. Insights into the distribution and trends of actively managed forest heights in the Southeast are gained from studying the vast dataset, allowing for more efficient land management and conservation initiatives. In actively manage stands, our site index equation improves the ability to anticipate site productivity and estimate future timber outputs. The difficulties with age estimation that have been observed highlight the need for better methods for mapping disturbances using remote sensing in forests that use thinning as a silvicultural prescription. / US Forest Service, joint venture agreement 20-JV-11330145-037, and the USDA Mclntire-Stennis Formula Grant program, accession number 7003904, “Precision forestry for southern pine carbon monitoring.” / Master of Science

The inevitable changes to the built environment over time presents the question of what contemporary design is appropriate for existing historical context. This is inherently a wicked problem that is becoming increasingly important to designers in the 21st century. Wicked problems, as the connotation implies, are those that are multi-faceted, unique, and with innumerable possible solutions (Rittel, Webber 1973). Each individual architectural project is a cog in a city’s evolving machine, therefore no one project should ever be considered unimportant. As Robert Venturi said in his “Gentle Manifesto”, a designer should strive towards “messy vitality over obvious unity” (Venturi, 1966). Finding a simple design resolution is difficult if not impossible in a complex urban city layered with centuries of architecture. It is not necessary to copy the historic building next door, nor is it appropriate to design as if a site has no neighbors. The surrounding context should be evaluated for its mass, scale, program, history, and materials, among others, to inform and inspire a contemporary designer’s work. This thesis offers no “solution”; rather a series of design considerations. These considerations are by no means prescriptive, however. My aspiration is that this thesis can be used by future designers as a tool to prompt discussion and discovery about their own site specific project. / Master of Architecture

Free-fall penetrometers (FFPs) are an attractive tool for the rapid characterization of sediments in the nearshore and coastal areas. To improve their measurement capabilities, modern FFPs can be equipped with pore pressure sensors. Pore pressure measurements are extensively used in traditional cone penetration testing, but their usage and interpretation is still limited for FFP testing. This thesis represents an effort to advance the interpretation of pore pressure measurements from FFP testing. Data was collected using the torpedo-shaped FFP BlueDrop during surveys at Herschel Island, YT, Yakutat, AK, Clay Bank, VA, and Yorktown, VA. Additionally, test deployments in the laboratory were performed in kaolin clay. Data analysis was focused on pore pressure measurements during these deployments. Two major advancements regarding current data analysis of FFP pore pressure measurements were explored: 1) a method based on fluid dynamic principles was proposed to correct the pressure recordings for the dynamic flow effects due to the high-velocity fall and impact. The results show that using Bernoulli’s theorem coupled with the concept of pressure coefficients results in good agreement between measured and hydrostatic pressures during the free-fall and initial penetration stage. 2) Pore pressure dissipation curves measured by the penetrometer at rest at maximum penetration depth were also studied. The mechanisms behind the non-standard dissipation curves were explored. The results suggest that non-standard dissipation curves can be interpreted by correcting according to Sully et al.’s (1999) extrapolation technique. The technique can also be used with data from an unsaturated or clogged filter. / Master of Science

Architecture has the unique ability to use its surroundings in a way that can create a profound impact; it has the power to generate emotion. To connect with the character of a place, we need to observe it, converse with it, and learn from it. No matter what the place, understanding its spirit is essential to design for it, because every addition to the place adds to its soul, its spiritual and emotional identity. It is important to note the first users of each site are what already exists, they define the spirit of the site and these users are not limited to just people, but rather they include the landscape as well. The trees that are growing and flourishing within the site are an important part of it. Architecture should look at the existing site and not take away from it but rather add to it. This thesis explores Daingerfield Island; Located along the existing Mt Vernon bicycle trail and the Potomac River, Daingerfield Island is an ideal location for a Bicycle and Water Taxi rest stop. It is a site that is mostly forested development, however, it is in a state of disrepair. It has great potential to become a wonderful pause space in the urban environment. The project explores emotions associated with resting and waiting, in hopes to prove that architecture has the ability to repair a damaged site. / Master of Architecture / Architecture not only affects those that inhabit it, but also its surroundings. Whenever we design a building, we need to understand that it is an addition to an already existing site; this addition should make the location better. Analyzing the site is essential in order to create an appropriate design for it. The thesis project is a Bicycle and Water Taxi rest stop located on Daingerfield Island, which is located along the existing Mt Vernon bicycle trail and the Potomac River. The design began with the sole intent of understanding the site; what its history is, what its present is, what its shortcomings are, what its strengths are, and what it needs. Only then did the architectural design begin.

As more emphasis is put on biodiversity conservation, how best to select a system of protected areas for wildlife conservation is an issue of great importance. There is a rich economics literature on the reserve site selection problem. However, most economic studies assume the independence of risks that affect wildlife species, leaving the issue of spatially correlated risk largely unexplored. This study contributes to the literature in twoaspects. First, this study incorporates spatially correlated risk, into a reserve site selection model. And second, this study incorporates heterogeneous spatial risk, in the context of land development risk in Virginia, both with and without a budget constraint. To evaluate the significance of spatially correlated risk in conservation design, I apply the reserve site selection model to a Virginia landscape. In a basic setting, a hazard is introduced which is allowed to spread to adjacent land parcels, where I investigate the impact of spatially correlated risk at three spatial scales: one-county, four-county, and state-level. Optimal reserve designs are characterized by similar spatial patterns indicating that spatially correlated risk plays an important role in the selection of parcels for reserve. Specifically, as spatially correlated risk increases, I find that, in general, reserve connectivity decreases. I also examine a setting with heterogeneous risk and observe similar patterns in the optimal reserve design. I find that the reserve becomes more dispersed in higher risk areas primarily. Finally, I explore the tradeoffs between species protection and budget constraints in the presence of heterogeneous spatial risk. All comparative statics indicate that spatial correlated risk plays an important role in conservation reserve design. / Master of Science

A goal of indoor wireless communication is to strategically place RF base stations to obtain optimum signal coverage at the lowest cost and power. Traditionally, transceiver locations have been selected by human experts who rely on experience and heuristics to obtain a near-optimum placement. Current methods depend on involved on-site communication measurements and crude statistical modeling of the obtained data which is time consuming and prohibitive in cost. Given the inherent variability of the indoor environment, such a method often yields poor efficiency. As an example, it is possible that more power than required or extra number of transceivers were used. This thesis describes an interactive software system that can be used to aid transceiver placement. The tool is easy to use and is targeted at users who are not experts in wireless communication system design. Once the transceiver locations are selected by the user within a graphical floor plan, the system uses simple path-loss models to predict coverage regions for each transceiver. The coverage regions are highlighted to indicate expected coverage. Earlier work assumed isotropic transceivers and had limited directional transmitter support. This thesis describes how the tool has been enhanced to support a wide range of 3D antenna patterns as encountered in practical situations. The tool has also been expanded to accommodate more partition types and to report area of coverage. The resulting system is expected to be very useful in the practical deployment of indoor wireless systems. / Master of Science

Site preparation is a required silvicultural practice for establishing loblolly pine plantations in the Piedmont physiographic region of the southeastern U.S.; however, relatively little is known about its effect on soil and site factors that influence growth and yield. In this study, the effect of seven different site preparation prescriptions on competing vegetation, tree nutrition, and the spatial distribution of planted seedlings was examined. Three treatments had a soil tillage component and differed with respect to the number of operations employed in removing residual trees and logging slash prior to discing. One treatment involved roller chopping and broadcast burning, one an application of the herbicide glyphosate followed by a broadcast-burn, one involved shearing all raking fogging-debris into windows, and one was no site preparation prior to planting. All treatments were applied to 12 sites in the South Carolina and Georgia Piedmont. After four years in the field, 756 trees within the site preparation treatment areas were randomly selected for analysis of foliar nutrients, soil nutrients, and competing vegetation. Herbaceous, woody shrub, and hardwood competition levels were not significantly different among site preparation treatment areas after four years. However, hardwood competition levels had increased at a faster rate during the last two growing seasons on chopped and disced areas than on the other areas. Hardwood competition became the predominant factor limiting pine basal diameter when 83% of the total basal area was in hardwoods or hardwood basal area levels exceeded 3.5 m²ha⁻¹. Potassium was identified as the most limiting nutrient 38% of the time, compared to 28% for phosphorus, 14 % for nitrogen, 7% for calcium, aiid 13% for magnesium. A significant linear relationship between soil and foliar nutrients confirmed these results. No treatment effect on nutrient deficiencies was evident. Foliar nutrient critical levels were derived using the Diagnosis and Recommendation Integrated System (DRIS) and were the same as those reported in the literature for nitrogen, phosphorous, and magnesium while potassium and calcium critical levels were determined to be twice as high as those reported (0.52% and 0.19%, respectively). The spatial distribution of seedlings at planting and after 2 years was determined. Spatial patterns varied from uniform to random as the degree of logging slash removal decreased. After two years, the spatial distribution shifted toward random and clustered. The degree of change was similar in all but the herbicide burn and untreated areas, which exhibited the greatest change and whose mortality tended to be clustered. / Ph. D.

Yes / Bog bodies are among the best-known archaeological finds worldwide. Much of the work on these often extremely well-preserved human remains has focused on forensics, whereas the environmental setting of the finds has been largely overlooked. This applies to both the ‘physical’ and ‘cultural’ landscape and constitutes a significant problem since the vast spatial and temporal scales over which the practice appeared demonstrate that contextual assessments are of the utmost importance for our explanatory frameworks. In this article we develop best practice guidelines for the contextual analysis of bog bodies after having assessed the current state of research and presented the results of three recent case studies including the well-known finds of Lindow Man in the United Kingdom, Bjældskovdal (Tollund Man and Elling Woman) in Denmark, and Yde Girl in the Netherlands. Three spatial and chronological scales are distinguished and linked to specific research questions and methods. This provides a basis for further discussion and a starting point for developing approaches to bog body finds and future discoveries, while facilitating and optimising the re-analysis of previous studies, making it possible to compare deposition sites across time and space. / The Home Turf Project of Wageningen University and Research Centre, financed by the Dutch Organisation for Scientific Research (NWO Vidi Project, no. 276-60-003).

This dissertation explores the perceptions of different groups of people (subsystems) who affect and are affected by the phenomenon of day labourers in Tshwane. Three "day labourer sites" were identified. Businesses, residents, police, metro-police and the municipality directly connected to these sites were interviewed. Their perceptions were analysed using the systemic frame of reference. The data was processed to describe perceptual relational patterns between the day labourers and the different subsystems. The following themes amongst these relational patterns were identified and described: employment, law and order, contact between subsystems, sharing the environment / community and resources / facilities. These themes were described in relation to the Bill of Rights (Chapter 2 of the Constitution of the Republic of South Africa, 1996). This research aims to highlight some of the voices of the groups affecting and affected by the phenomenon of day labourers. / Social Work / M.A. (Mental Health)

This practice-as-research project investigates how a piece of site-responsive Installation Art, titled Triple Point Dunnage (exhibited in Royal William Yard, June 2009), can be used to generate knowledge about memory work through experience of site. Working in dialogue with the ideas of Daniel C. Dennett, Lucy Lippard and Gaston Bachelard, I attempted to create a permeable and fluctuating creative setting for the memory work of participants. An approach that used site as a stimulant within a process which also incorporated theoretical themes. During the period of design and construction, I interacted with and recorded interviews with people who had a personal connection with the site or with an interest in how memory works. The final installation presented layers of spoken fragmented content in a dialectic relationship within the installation’s spatial construction. The responses of the installation’s visitors and participants were collated through a response book and interviews. These were analysed in order to discover to what extent, if at all, the properties I had developed and designed into the work had shaped the engagements of the participants. The multi-valented properties of the work generated an array of responses that suggested that the viewers had fashioned their experience by blending the fragmented stories of others with their own personal histories. This engagement resembles Dennett’s concept of “self-narrator” and resonates with Bachelard’s concept of the fusion of physical and psychological space and Lippard’s understanding of place. By exploring memory through site Triple Point Dunnage generated a sense of place that was a fusion of the participants’ responses to the external physical environment and their associative memories stimulated by the affective fragmented properties of the work.