Electronic Theses and Dissertations (PhDs)

Permanent URI for this collectionhttps://hdl.handle.net/10539/38008

Browse

Start date: 2020Subject: search.filters.subject.SDG-11: Sustainable cities and communities

Search Results

Now showing 1 - 3 of 3
  • No Thumbnail Available
    Item
    A geographical analysis of the impacts of construction and demolition waste on wetland functionality in South Africa: a study of Gauteng province
    (University of the Witwatersrand, Johannesburg, 2024-09) Mangoro, Ngonidzashe; Kubanza, Nzalalemba Serge; Mulala, Danny Simatele
    The purpose of this study was to investigate construction and demolition waste management processes in sub-Saharan Africa and how they affect wetland ecosystems, using South Africa as a case study. Construction and demolition (CDW) waste has become a massive urban environmental challenge on a global scale, but more so in developing countries found in sub-Saharan Africa. In the context of South Africa, construction and demolition waste is not a waste stream taken seriously by local and national authorities because it is ‘general waste that does not pose an immediate threat to the environment. This position is premised on the idea that construction and demolition waste is generally inert (chemically inactive) and therefore cannot cause an immediate environmental risk. In this study, it is argued that the environmental risk of waste goes beyond the embedded chemical constituencies because some waste streams can cause immediate environmental risk through their physical properties depending on the location of disposal. It is further argued that although CDW is generally inert, disposal in wetlands immediately disrupts the way wetland ecosystem’s function, causing several environmental risks. To mitigate the environmental threats posed by construction and demolition waste, this study proposes a change in the methodological approaches and strategies deployed to manage the waste stream, such as by introducing a hybrid of circular economy and industrial ecology to minimize or eliminate waste production. This study involved several data collection and analysis methods. Using a combination of qualitative and quantitative studies methods, data was collected with the goal to understand the perceptions of experts on how construction and demolition waste management in South Africa affects wetland ecosystems and what can be done to effectively manage the waste stream in the context of a developing country. Data informing this study were collected through semi-structured interviews and surveys in the province of Gauteng, specifically in the City of Johannesburg and City of Ekurhuleni Municipalities, where there is massive illegal dumping in wetlands for various reasons. Furthermore, apart from the use of semi-structured interviews and surveys, a digital elevation model was generated in ArcGIS Pro 10.1 software to measure the effects of construction and demolition waste on wetlands in the study area. The approach to this study using both qualitative and quantitative methods was crucial because it provided human perceptions which were accurately corroborated by GIS software. The study found that construction and demolition waste management in South Africa is affected by several challenges that lead to massive illegal dumping in critical ecological ecosystems such as wetlands. In a broad sense, the major challenge to sustainable construction and demolition waste management in South Africa is institutional failure at both the local and national levels. Local authorities such as municipalities are characterized by massive corruption, poor funding, and lack of strategic technologies among other things, while at the national level, there is massive interference with municipal affairs through bureaucratic delays in the disbursement of municipal funds. A combination of these and other factors leads to illegal dumping of construction and demolition waste across the Gauteng Province, particularly in wetlands in low-income areas. The data informing this study reveals that dumping construction and demolition waste in wetlands causes an immediate threat to the existence of wetlands through massive sedimentation with insoluble materials. It is ultimately found that construction and demolition waste destroy the ability of wetlands to offer ecosystem services such as flood attenuation, carbon sequestration, water filtration, and habitat provision, among other functions, leading to environmental events such as flooding. A combination of circular economy and industrial ecology can be one of the ways that can be deployed to effectively and sustainably manage construction and demolition waste in South Africa. The circular economy and its three principles of ‘reduce’, ‘recycle’, and ‘reuse’ has been successfully deployed in developed countries in the European Union, where recycling has topped 70% of the total construction waste generated. Industrial ecology with its analogy of industrial ecoparks has been deployed in the European Union with immense success, until more attention was directed to circular economy. With an increase in municipal funding and introduction of a construction waste information system, a combination of ‘circular economy’ and ‘industrial ecology’ can significantly help to reduce pressure on wetlands and the environment at large. Even though the methodological improvements suggested above could significantly reduce pressure on wetlands, the implementation could be faced with institutional challenges. Therefore, it is argued that urgent institutional transformation is required to make tangible changes in the field of construction and demolition waste management. It is recommended that there should be increased law enforcement to curb widespread illegal dumping in South Africa’s major cities. It is also recommended that, like in Europe, South Africa must introduce tailor-made legislation of policies for construction and demolition waste alone. Promulgation of dedicated legislation provides clear direction on how the waste stream is managed and who is responsible for specific roles. Furthermore, dedicated legislation can be a crucial tool to deliver sustainable construction and demolition waste management in South Africa because it can be used to encourage the use of recycled aggregates and limit the amount of illegal dumping or extraction of materials from the environment. Finally, dedicated construction and demolition waste legislation can be used to shift from the traditional view of pollution or contamination through toxicity, and so the value of this study is immediately apparent.
  • Thumbnail Image
    Item
    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.
  • Thumbnail Image
    Item
    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.