Faculty of Science (ETDs)

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A Geospatial Approach to Mapping Jacaranda Tree Distribution in Johannesburg, South Africa
(University of the Witwatersrand, Johannesburg, 2023-11) Reddy, Rohini Chelsea; Fitchett, Jennifer
Accurate mapping of the spatial distribution of invasive species is vital for the implementation of effective monitoring and management strategies. In countries where resources are scarce and costly, citizen science provides a cost-effective and accurate alternative for large-scale data collection. Citizen’s familiarity with their environment contributes to aspects such as accurate identification of features on the landscape. Advances in a geographic information system (GIS) together with open-sourced photography from Google Street View, provide accurate methods for in-field and remote validation of citizen science data for invasive mapping and assists with the creation and compilation of maps to visualize the spatial distribution of invasive plants upon the landscape. In this study, the first spatial distribution maps for invasive tree species, Jacaranda mimosofolia (common name: Jacaranda), are created for the City of Johannesburg (CoJ). Jacaranda trees are well-known by citizens in the CoJ for their district purple flowers which blanket the landscape during springtime. A combination approach using citizen science, GIS, and Google Street View for data collection, analysis, and creation of the first spatial distribution map of exact location and prevalence of Jacaranda trees within certain suburbs of the CoJ, is produced. A total of 8,931 ground-truthing geopoints together with extensive Google Street View validation for Jacaranda tree presence, formed the basis of accurate spatial distribution maps. The first research question of this study focused on the spatial distribution of Jacaranda trees in the CoJ and was answered as a total of 54 suburbs were confirmed as having a large presence of Jacaranda trees in the CoJ. Citizen science data collected a total of 488 geotags for possible Jacaranda tree presence in the CoJ, over a 75-day online survey collection period. Although citizen science data provided a lower spatial resolution compared to successful fieldwork and Google Street View approaches, citizen science data provided very high accuracy for the identification and geolocation of Jacaranda tree presence in the CoJ which answers the second research question based on the effectiveness of the geospatial approach towards citizen science, ground-truthing and Google Street View as data collection methods. Since the accuracy of citizen science resulted in 66% of collected geotags within the categories of ‘very high’, ‘high’ and ‘moderate’ accuracy ranges of between <7-24m from a confirmed Jacaranda tree, together with the accuracy of 8,931 in-field collected geolocation of Jacaranda trees and Google Street View’s accuracy and capability of collecting street view imagery – it is concluded that the combined approach of ground-truthing, citizen science and Google Street View contribute not only to effective data collection, but also towards the successful mapping of Jacaranda tree presence in the CoJ.
An essential variable approach for integrated social-ecological systems monitoring to determine sustainability in a South African catchment
(University of the Witwatersrand, Johannesburg, 2024-05) Itzkin, Adela; Clifford-Holmes, Jai Kumar; Coetzer, Kaera; Scholes, Mary
This thesis presents an essential variable (EV) approach tailored for integrated social ecological systems (SES) monitoring within the Tsitsa River Catchment (TRC) in South Africa. The study addresses the conceptual and methodological challenges inherent in SES integration and monitoring to provide insights into sustainable landscape management. The research methodology employed a transdisciplinary social learning process, integrating systems thinking and participatory research methods across three related publications. In the first publication, systems diagramming, qualitative interviews, and participatory data collection provided a systemic snapshot of the interconnected social and biophysical drivers of land degradation in the TRC. The findings underscored the dual benefits of changes in land use and grazing practices for landscape improvement and sustainable livelihoods, informing the identification of monitoring variables crucial for sustainable land management. In the second publication, a social learning process, termed participatory self-observation, explored approaches to enhance integration and monitoring of biophysical and social data for adaptive management. The process identified data integration, overload, scale, learning oriented monitoring, and relationship-building as key challenges in SES monitoring Recommendations included participatory approaches focusing on applied work, identifying essential data for SES monitoring, and improving transdisciplinary collaboration. In the third publication, a transdisciplinary process guided by EV development identified Essential Social-ecological System Variables (ESEVs) for the TRC, emphasising the relational connection between social and ecological aspects of SESs. ESEVs were prioritized based on essentiality scores and participant consensus, facilitating integrated planning and management at the catchment scale. The ESEVs identified for the TRC include 'soil erosion related to human actions on the land,' 'participation in natural resource governance,' 'grazing and rangeland sustainability,' and 'land cover and condition. Participants proposed three additional ESEVs, 'access to water,' 'local natural resource governance system,' and 'human well-being in the landscape'. The study concludes that collaborative learning informed by diverse transdisciplinary perspectives can guide adaptive monitoring approaches, with lessons from the TRC applicable to diverse contexts. The ESEV approach offers wider application value, addressing the question of the minimum variables needed for integrative landscape management in complex SESs. Overall, this thesis pioneers a transdisciplinary mixed-methods approach for efficiently monitoring social-ecological sustainability outcomes. Through advancements in conceptualizations of integrated, contextually grounded monitoring, it offers a novel perspective for understanding the implications of development interventions, bridging critical gaps in SES monitoring.
Assessment of the impact of load shedding on the households of Alexandra, Johannesburg, South Africa
(University of the Witwatersrand, Johannesburg, 2023) Mbatha, Cebolethu; Kubanza, Nzalalemba Serge
In South Africa, persistent challenges in the electricity sector have been noted. This study emphasizes that having access to electricity is insufficient; the reliability of its supply is crucial,especially given prolonged power outages faced by a significant portion of the population. In Alexandra Township at two residential areas, 16th Avenue and East Bank, the research used a mixed-method approach, involving questionnaires for 100 households and 20 local businesses, and semi-structured interviews with representatives from the local city authority. Results indicated substantial disruptions to daily lives and operations. These disruptions adversely affected critical social services, hindering operations in essential infrastructures like water supply systems, hospitals, education institutions, and telecommunication systems. The study identifies illegal electricity connections, infrastructure loss, and political interference as perceived major causes of successive power outages in Alexandra. It highlights the worsening nature of load shedding, making it a significant political issue in South Africa, reflecting hardships households and businesses face. The paper recommends governmental subsidies for alternative energy appliances and more favorable electricity tariff rates for households and small businesses to alleviate demand during peak periods. The findings offer valuable insights for policymakers and the South African electricity utility in analyzing trade-offs between negative welfare effects and costs of reducing power outages
Cartographic History, the Post-Colonial Landscape and the Agricultural Settlement Scheme: A Case Study of Citizen-Based Mapping in Northeastern Ibadan Rural Hinterland
(University of the Witwatersrand, Johannesburg, 2023-10) Ogundiwin, Babatunde Adedayo; Wafer, Alex
Maps of economic imagination provide visual insights into alternative agrarian spatial thought. This thesis examines visual contribution to reconstituting agricultural subjectivity. It explores the potential of citizen-based mapping in consolidating alternative visions of the agricultural settlement scheme. Visualisations are integral in the discursive technologies of post-colonial state policies that produce modern agricultural subjectivity. On one hand, these state cartographic strategies involve othering practices of subaltern agriculture. On the other hand, there are resurgent ideas of community-based agricultural schemes verbalised amongst subaltern groups. Hence, there is an ongoing political-economic struggle of visions mediated by visualisation and verbalisation. Drawing upon theoretical literature in spatiality, postcolonialism and governmentality, the thesis explores taken-for-granted knowledge, sites of economic difference and silenced voices/visions on the post-colonial agricultural landscape. Using Northeastern Ibadan rural hinterland of Oyo State, Southwest Nigeria, as a case study, the thesis argues that visualisation offers insight into counter-narratives and alternative reframing of the agricultural settlement scheme. This study employed a multi-method qualitative approach involving the critical historical reading of state maps, ethnographic analyses and mapmaking techniques to visualise and summarise developmental concerns and aspirations. The thesis demonstrates that state imaginative geographies strive in shaping agricultural identities and subjectivities. Recently, these cartographic legacies of state rationalities seek the active consent of the citizenry in the drive toward state-sanctioned neoliberal imaginary. The study contends that the post-colonial state in Nigeria envisions a large-scale agricultural development rather than supporting smallholder subaltern agriculture. Hence, there is intentional and unintentional involvement in visual disinformation and engagement in anti-political economic imaginations of subaltern agriculture. However, the visualisation of verbalised counter-narratives contesting state developmental visions and alternative imaginations of the agricultural settlement scheme unveil anticipatory spatialities desiring a break from economic decline and stagnation in rural hinterlands. This transformation of imaginaries into visual images emphasises new perspectives and new insights renegotiating the political subjectivity of subalterns. This thesis demonstrates that visual geographies of subaltern aspirations offer alternative visions of the agricultural settlement schemes.
Does public participation facilitate the development of a comprehensive social impact assessment process in South Africa? a study of the Carolina town community in Mpumalanga
(University of the Witwatersrand, Johannesburg, 2024) Gilfillan, John; Simatele, Mulala Danny
The inadequate integration of social and economic dimensions within impact assessments, particularly in the context of mining activities is particularly worrisome. The lack of a standardized and inclusive model, coupled with insufficient consideration of local knowledge, contributes to conflicts and dissatisfaction in mining communities. Public participation, crucial for a holistic assessment, faces hurdles like awareness gaps, language barriers, and inadequate community representation. These challenges hinder the achievement of sustainable outcomes in mining development projects. This study assesses the current state of public participation in Social Impact Assessment (SIA) processes within mining communities in Carolina. This study employed a qualitative approach. Purposive and snowball sampling techniques were used to identify the relevant participants for this study. Drawing on diverse perspectives from technocrats, community members, homeowners, and stakeholders, the research unveils insights into the effectiveness of public engagement between the Carolina community and mining operatives. After engaging with the participants ultimately a total of 45 participants were identified. Data collection tools were the use of the focused group interviews and semi- structured questionnaires. The findings reveal a predominant dissatisfaction among participants, with 70% expressing the ineffectiveness of public participation in SIA. The study identifies a lack of inclusivity, transparency, and communication in the current approach, as community members feel excluded from decision making processes. Motivations for engagement centre on the crucial need for job opportunities provided by mining operations, reflecting the community's economic aspirations. However, expectations extend beyond employment to include broader community development aspects, indicating a desire for positive impacts resulting from mining activities. Further exploration into the role of public participation in identifying community challenges highlights a significant lack of awareness and understanding among participants. The study underscores language barriers, geographical distance to meeting venues, and a perceived absence of tangible outcomes as significant challenges. Participants express frustration with the current state of public participation, emphasizing the need for transparency, genuine commitment, and accountability from mining companies. The research concludes with recommendations for a more inclusive, accessible, and communicative public participation process to address community challenges effectively. It calls for improved education, language inclusivity, and enhanced communication channels to foster meaningful engagement and ensure a more equitable and sustainable future for the Carolina community affected by mining activities
Employee Sentiments Concerning Workplace Greening
(University of the Witwatersrand, Johannesburg, 2023-09) Khorommbi, Phumudzo; Moolla, Raeesa
For centuries, people have continuously impacted the environment, resulting in an exponential rise in environmental problems and deterioration. In the quest to find solutions, business organisations have employed or tried to institute greening programmes, such as promoting waste at source and installing solar panels. However, it is essential for people, specifically in occupational settings, to see this as a need - for greening programmes to be effective. To this end, this study aimed to identify the elements that drive individuals to conduct environmentally responsible behaviours at work. This qualitative study collected data by administering surveys to research participants. Information related to eco-helping, eco-initiatives and eco-civic engagement was collected by administering surveys to local contractors at the PepsiCo site in Kempton Park, Johannesburg. The survey amassed 70 responses during October 2023. The study found that gender was an important indicator of pro-environmental behaviour, and that age affected a person’s inclination to act pro-environmentally. As this study relied on proclamations of good environmental intentions from participants, future studies should test this hypothesis in the field to quantify its success.
Examining the remaining Rock Art at Linton, Eastern Cape, and its relationship with the Linton Panel at the Iziko South African Museum in Cape Town
(University of the Witwatersrand, Johannesburg, 2023) Oster, Sandee Michelle; Pearce, David
The Linton panel has been the subject of great awe for many decades. It has been displayed in various exhibits worldwide and the subject of multiple research publications. However, its history and origin are not nearly as well understood as once believed, as a large part of its past has been omitted or forgotten. In this dissertation the images of not only the Linton panel are discussed, but those that remain in the shelter from whence it came are brought out of obscurity. How the panel came to be where it is today and the images’ relationship with the shelter and the remaining paintings are examined. Lastly, a forgotten piece of the shelter, a second panel, will be examined in greater detail than ever before: how it fell into relative obscurity and what its images tell us about the Linton shelter and its artists’ beliefs and purposes.
Reconstructing locomotor behaviour of Southern African plio-pleistocene cercopithecoids: evidence from functionally-related inner structural arrangement of the trabecular bone
(University of the Witwatersrand, Johannesburg, 2023-07) Babutsi, Mosarwa; Beaudet, Amélie; Zipfel, Bernhard; Jakata, Kudakwashe
Because of their abundance in African Plio-Pleistocene hominin-bearing sites and their stratigraphic association with fossil hominins, cercopithecoids represent a relevant “control group” for contextualising hominin evolution. often considered as ecological and biochronological indicators, particularly their ecological sensitivity is valuable in reconstructing southern African hominin bearing site’s palaeoenvironment and environmental changes. Since biomechanical loadings on trabecular bone produced throughout locomotor activities shape the structure of the skeleton, particularly at locomotor key joints, the expectation is that investigation of the trabecular bone of fossil cercopithecoids key joints like femur, humerus, Tibia and calcaneus would provide further evidence for eloquent discreet disparity in their locomotor behaviour and reconstructing their paleohabitats. This study used trabecular bone, described as meshwork or sponge with porous network within long bones joints and inside footbones contains red bone marrow. Its preferred orientation in is the basis of Wolff’s law, relating bone structures and its ability to adapt to mechanical load alignment in the direction of loading stress, as such recoding informative locomotor signals. Forty one (41) fossil cercopithecids from the Cradle of Humankind World Heritage sites that include Sterkfontein, Swartkrans, Makapansgat, Taung and Bolt’s Farm as well as forty (40) extant cercopithecoids specimens were scanned using a micro-focus X-ray computed tomography (CT) scanner. Trabecular bone parameters that include trabecular bone fabric anisotropy, volume fraction, thickness and spacing were quantified in ImageJ. These Plio-Pleistocene cercopithecoids recorded more arboreal locomotor signals with occasional terrestrial locomotion, suggesting transitional palaeoenvironment from long trees with cool climatic conditions to a more open grass land savanna type with dry climatic conditions believed contributed significantly to extinct of archaic humans and the emergence of the successful Homo.
The Role of Social Impact Assessments in Skills Development and Sustainable Communities in South Africa’s Just Energy Transition from Coal: A Study of Carolina and Kriel Mining Communities in South Africa
(University of the Witwatersrand, Johannesburg, 2023-10) Chidzungu, Thandiwe; Wafer, Alex
The study investigated the role of Social Impact Assessment (SIA) in addressing skill development needs and community sustainability issues in relation to a Just Energy Transition (JET) away from coal to the renewable energy sector in the Kriel and Carolina coal mining communities in Mpumalanga, South Africa. It had the following objectives: To explore the sustainability perspectives in the energy transition from coal to a low-carbon economy. Secondly, to examine the skill development needs within the energy transition from coal to the renewable energy sector in the coal industry in the two coal mining communities under study. Thirdly, to evaluate the potential of SIA as a strategy for assessing and addressing the social impacts of an energy transition from coal to the renewable energy sector on the two affected communities. Lastly, to recommend SIA as a policy entry point that the government can leverage in the Just Energy Transition policy framework in South Africa. A qualitative research approach, including quantitative techniques, was adopted. The primary data was collected through online and physical, semi-structured interviews and questionnaires. A desktop study was used to collect secondary data. 230 participants, comprised of 60 experts and 170 community members, were engaged in the study. The participants were sampled using systematic, purposeful, random, and convenient sampling techniques. The researcher attended six webinars, two conferences, and two community forums on coal mining and renewable energy, where she gleaned some of her data and met some of the study participants. The Theory of Change was used as the theoretical framework. Findings on community sustainability issues in the two study areas reveal a lack of public participation, an increase in unemployment, and poor policy enforcement in land reform, affecting agriculture as the energy shift from coal to the low-carbon economy unfolds. They also point to cultural disruptions linked to possible internal relocations to make way for Renewable Energy (RE) infrastructure and gender disparities in economic participation that can threaten community sustainability. On a positive note, findings alongside the reviewed literature point to the growth of new economic opportunities linked to JET both in the affected regions and elsewhere, further creating employment opportunities. However, jobs created elsewhere may see relocations of the active group, affecting community stability and hence sustainability in the sending coal areas. Findings also highlight the perceived improvement in environmental sustainability linked to a reduction in pollution as clean RE technology is introduced, which improves health and agricultural yields as water, air, and soil quality are improved, thereby impacting community sustainability positively. With regards to skills development needs, the findings show low levels of educational attainment among the youth, a high rate of school dropouts coupled with poor school attendance, and a poor establishment of Science, Technology, Engineering, and Mathematics (STEM) fields, all of which will impact skill development during the energy transition. The study submits that the advocacy role of SIA can influence a rethink of curriculum design and fuel the creation of a skills needs assessment in line with the vocational system and Renewable Energy (RE) sector labour market demand. Moreover, it advocates for local action plans to support skills development through adult literacy centres for school dropouts and Conditional Cash Transfers (CCTs) to promote school attendance and the taking of STEM subjects targeted at females in schools and vocational colleges, who are disadvantaged compared to their male counterparts. With regards to the potential of SIA as an effective tool for addressing the social impacts of an energy transition, the study demonstrates that SIA can facilitate the identification of the social impacts and promote a deeper understanding of these impacts through its grassroot-level engagements. As well as facilitate the addressing of these social costs through sector-literate SIA teams, multi stakeholder collaborations, and community engagements. Furthermore, in the evaluation of developmental projects, SIA highlights the gender and age constraints of the social change process that need to be considered in JET’s socio-economic impact mitigation efforts. The findings further point to the consistency of SIA with the Grassroots Theory of Change, which articulates that change is made through collective action by communities regarding a problem or problems affecting their lives (Stachowiack, 2013). SIA is also demonstrated as a potential tool for strategic planning to identify current needs and opportunities that resonate with the "Policy Windows Theory of Change" by John Kingdon, which involves launching in-depth investigations of problems and providing constituent feedback as one application technique for advocacy (Coffman, 2007). All these attributes afford SIA the opportunity to fuel distributive, procedural, and rectificatory justice as the JET unfolds, making it better placed as an entry point to socially oriented policies. This positions SIA as a strategic tool that can assist with impact mitigation for JET-related social costs associated with skill development needs and community sustainability issues. The study, however, condemns the once-off process accorded to SIA and advocates for its use as an ongoing process as the JET unfolds to allow for continued monitoring and assessments and, hence, effective impact mitigation.
Traditional Custodians, Sacred Heritage Sites and Tourism Development: A Case Study ofthe Phiphidi Falls in the Limpopo Province of South Africa
(University of the Witwatersrand, Johannesburg, 2023-09) Mabehle, Nhlaluko; Russell, Thembiwe
The way in which intangible heritage should be preserved is a debatable subject, and the question about who should have authority over what happens at sites associated with spiritual values is often a contentious issue. While local communities frequently hold traditional custodianship of the sites, they usually do not have any legal custody. When tourism developments are suggested in impoverished rural communities, whose basic rights could be met by allowing tourism developments to happen, conflicts frequently arise. Traditional custodians tend to want to keep their places of worship sacred while tourism developers would rather promote such sites as touristic products and potential source of income for the community. Fractions can occur within the communities as well. This project investigated community attitudes towards cultural heritage in Limpopo, using the case of Phiphidi Waterfalls, a site earmarked for tourism development, to analyse traditional management systems and to develop a framework for the effective management and preservation of sacred sites. Comparative studies were used to analyse traditional management systems in southern Africa. The main objective is to attain sustainable preservation of intangible heritage without any conflicts between traditional custodians and tourism authorities, and so this project contributes to the larger debate about who should have authority over sacred sites.

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Browsing Faculty of Science (ETDs) by SDG "SDG-11: Sustainable cities and communities"

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