Please read the abstract in the section 00front of this document / Thesis (DPhil)--University of Pretoria, 2006. / Geography, Geoinformatics and Meteorology / DPhil / Unrestricted

Previous studies found that during a rainfall event, pre-event water, which exists in the catchment before the event, may appear in significant amounts in the stream stormflow hydrograph. Pre-event water is predominantly groundwater. Among the mechanisms that have been proposed to explain the rapid mobilization of pre-event water from hillslopes are: (1) groundwater ridging (GWR) i.e. the rapid rise of a water table in environments, where the capillary fringe, or the zone of tension saturation, is very close to the ground surface and (2) the Lisse Effect (LE) i.e. the rapid response of a groundwater level to pressurized pore air in the unsaturated zone. Published literature explains that GWR is caused by the application of a small amount of water on the ground surface. On the LE, it is explained that pressurized pore air acts at the water table, resulting in a rapid rise of the water level in a well, screened below the water table. These explanations are insufficient on the physical processes involved in GWR and the LE. The objectives of this study were: (1) to use the commonly observed catchment hydrological processes i.e. tensiometric pore water pressure, shallow groundwater levels, rainfall data and the hydraulic properties of soils, to quantify and describe the physical processes involved in GWR and the LE mechanisms; (2) to perform laboratory experiments, in order to understand the physical processes involved in the LE; and (3) to develop a mathematical theory that can describe the physical processes in the LE. Results indicated that GWR and the LE are caused by the addition (elevation) of potential energy in water within the capillary fringe. In GWR, the additional energy is from the intense rainfall. In the LE, the additional energy is from compressed pore air in the unsaturated zone. In both mechanisms, the added energy diffuses through the capillary fringe, as a downward pressure wave, releasing the tension forces in water. As soon as the downward pressure wave-front arrives at the water table, the water table begins to ascend, as an upward pressure wave. The ascending water table steepens the hydraulic gradient, which results in the rapid groundwater fluxes, without the recharge of the water table by the infiltration profile. / Thesis (Ph.D.)-University of KwaZulu-Natal, Durban, 2013.

Thesis (MA)--Stellenbosch University, 1933. / ENGLISH ABSTRACT: no abstract available / AFRIKAANSE OPSOMMING: geen opsomming

Considerable attention has in recent times been given to the attitudes of secondary school pupils towards Geography among black schools in South Africa. Many reasons account for this. It is partly because of the poor results and falling numbers of pupils in the discipline. Concern has also been expressed on the relevance of the Geography syllabus to the black pupils. Evidence suggests that these problems are evident in Transkei. The need therefore exists to assess pupils' attitudes towards Geography in Transkei. Arising from this background, this study sets out to assess the attitudes of secondary school pupils in Transkei towards Geography. Two hundred and thirty four pupils from eight urban and rural secondary schools in the Butterworth District of the Republic of Transkei were used in the study. Attitudes were measured in terms of "interest in Geography", "desire to study the discipline", "commitment to Geography" and the perceived relevance of the discipline. Through the use of techniques such as percentages, chi-square and principal component analysis - among others - for the analysis of the data, the following information emerged from the study: (1) Geography is generally perceived as being worthy of study; (2) Differences in responses were noted to result from a complex of factors which were grouped into home environmental factors and school environmental ones. (3) The major factor influencing attitudes towards Geography was noted to be home environmental conditions.In general pupils from lower income families expressed more positive views about the worth of Geography than those from the upper income families. From the above findings, it has been proposed that teachers and educational planners need to be made aware of these findings as they are important for classroom practice. It has also been recommended that there is a need to improve certain school practices such as taking pupils on Geography excursions more often as factors such as this were shown to improve pupils' attitudes towards the discipline.

Mapwork is an established part of the geography curriculum, and yet it poses particular problems for pupils and teachers. Maps participate in a complex system of graphic communication: the conceptual abstraction involved in the reading and interpretation of maps requires on the part of pupils a high degree of cognitive and perceptual development; teachers, too, often experience considerable difficulty in imparting the skills necessary for graphic literacy (graphicacy). The peculiar difficulties associated with map reading and the poor performance of pupils in this area have regrettably encouraged an attitude which dismisses mapwork as irrelevant or dispensable in geographical education. Yet graphicacy is essential not only in the learning of geography but in the overall cognitive development of the child, and therefore cannot be excluded from the curriculum. This study attempts to identify some of the specific difficulties experienced by pupils in their attempts to read and interpret maps, and to trace the origin of these difficulties. It argues that the complexity and sophistication of the skills necessary to interpret topographical maps and aerial photographs, for instance, should not be underestimated. Teachers need to be made aware of how pupils acquire map reading skills and of the problems they encounter during this process, so that teaching programmes commensurate with pupils' level of cognitive development can be formulated. It is also important that mapwork be taught in as practical a manner as possible. The findings and recommendations of this study have implications for geography teachers, textbook writers and educational authorities, especially those involved in curriculum and syllabus design.

Research on hillslope surface processes and hillslope stratigraphy has been neglected in southern Africa. The amount of published literature on hillslope stratigraphy in southern Africa is very limited. Hillslope sediments provide a record of past environmental conditions and may be especially useful in calculating the recurrence interval of extreme environmental conditions such as earthquakes and intense rainfall events. The characteristics of hillslope sediments provide information as to their origin, transport and mechanisms of deposition. No published work could be found that had been undertaken on hillslope surface processes or stratigraphy in the eastern Cape coastal region. This study attempted to fill this gap in the geomorphic literature for southern Africa. The surface processes acting on hillslopes at Burchleigh and Spring Grove in the Alexandria district of the eastern Cape were examined in terms of slope morphology, surface sediment characteristics and the internal geometry of the hillslope sedimentary deposits. The late Quaternary hillslope sedimentary deposits at the two study sites are composed of fine grained colluvial sediments intercalated with highly lenticular diamicts. The fine grained colluvial sediments were emplaced by overland flow processes while the diamicts were deposited by debris flows. The sedimentary sequences at both study sites have a basal conglomerate interpreted as a channel lag deposit. Most slope failures preceding debris flow events were probably triggered by intense or extended periods of rainfall associated with cold fronts or cut-of flows. Seismic events may also have triggered slope failure, with or without the hillslope sediments being saturated. The results of this study indicate that a continuum exists between the slopewash dominated processes of the presently summer rainfall regions of Natal to the present winter rainfall regions of the western Cape where mass movement processes are significant. Hillslope deposits, therefore, provide a record of environmental conditions which may greatly facilitate proper management of the landscape.

Current theories in geographical education advocate the use of strategies that encourage the pupil to play an active role in learning, thereby making such learning more meaningful and effective. Fieldwork is perceived as one such method. Fieldwork helps pupils acquire and develop understanding of geographical concepts, skills, attitudes and values through their own efforts and involvement. Fieldwork approaches have tended to change with the changing paradigms resulting in the development of approaches that are more pupil and experience oriented. In the South African school geography curricula fieldwork has been explicit since 1985. However, research has shown that in most South African secondary schools fieldwork as a teaching strategy is only applied to a limited extent. Teachers have always used financial constraints and time limitations as explanations for their failure to use fieldwork in teaching geography. This study attempts to demonstrate how the local environment of any school can be used effectively for teaching and learning most aspects of the senior secondary school geography syllabus, thereby alleviating the problems of time and money perceived by teachers as the major constraints inhibiting their use of fieldwork. In order to illustrate the effectiveness of fieldwork in the local environment, this study incorporated an analysis of the current senior secondary school geography syllabus, the identification of potential fieldwork sites in the Umtata District and the development and implementation of three fieldwork units based on three of the sites identified. The analysis of the evaluations of the three fieldwork units by the researcher, the pupils and the non-participant observer revealed that fieldwork conducted in the local environment is highly effective, interesting and rewarding to pupils even when they have no prior experience of fieldwork.

The study has investigated the relationship between climate-change adaptation and the role of sense-of-place on people’s decisions regarding relocation, using Soweto-On-Sea and Veeplaas as case studies. The adoption of social science methods in the investigation led to the development of indicators, which themselves were derived from theories, which explained the building blocks of sense-of-place. These indicators: place attachment, place identity and place dependence, helped explain the connection people have with home, and how these connections are influenced and affected by interactions that take place in Soweto-on-Sea and Veeplaas. The fixed-mixed methodology, along with purposive-quota sampling, provided the means of investigating climate-change adaptation and sense-of-place in Soweto-on-Sea and Veeplaas. The three indicators were used in conjunction with a six-point ranking system, which was used to analyse the findings. The ranking system measured the degree of connection people have with home. A noticeable pattern between length-of-stay, and a very strong connection, could be recognised. A gradual increase in the degree of connection to home was recognised; as younger members of the two communities scored more moderately; and the oldest members (willing to sacrifice for a place, ranking five) scored highly. A strong interplay between the indicators could be observed; and thus, a single indicator on its own could not properly explain sense-of-place; but interactions between the two theories allowed for greater understanding. The youngest members of the two communities scored lower; because their connection was based on practical issues, access to schools, police stations, cheaper public transport and a sense-of-safety; as the members in the communities knew one another. Those residents who scored high on the ranking system had a much stronger bond, which went beyond practicality; as various interactions contributed to their sense-of-place. Sense-of-place contributes significantly to people’s decisions regarding relocation; and thus, fundamental benefits in incorporating a study of sense-of-place in climate-change adaptation would allow for greater understanding, and lead to improved ways of protecting people in areas at risk.

Dissertation submitted to the Faculty of Science, University of the Witwatersrand, Johannesburg for the Degree of Master of Science. / Recent research has highlighted the lack of information on elevated absolutely stable layers per se throughout the troposphere over the southern African subcontinent. Hence a climatology of elevated absolutely stable layers is derived for each of four predominant synoptic circulation types over Southern Africa; namely semi-permanent continental anticyclones, transient mid-latitude ridging anticyclones, westerly wave baroclinic disturbances and barotropic quasi-stationary easterly waves. The horizontal and vertical structures as well as the temporal persistence of elevated absolutely stable layers are analysed using radiosonde data from nine South African aerological stations from the period 1986-1993. In addition, a climatology is derived for the mid-winter stability maximum, during the month of July from 1989-1993, in order to gain greater insights into the influence of anticyclonic circulation on the elevated absolutely stable layers. Four non-surface stable layers are identified over the country, at approximately the 800 hPa, 700 hPa, 500 hPa and 300 hPa levels. The lower of these layer occurs only over the coastal regions. All of the discontinuities exhibit a high degree of persistence and appear to be rapidly reconstructed subsequent to synoptic scale disturbances. The presence of these layers has obvious implications for local as well as global pollution transport, since stable discontinuities trap pollutants below their bases and act as upper air boundaries. As a consequence, global-scale transport of aerosols and trace gases in the free air is controlled to a large degree by these discontinuities. Greater insights into the mechanisms controlling such large-scale transport are essential in ascertaining southern Africa's contribution to greenhouse gas concentrations. Moreover, the persistence and strength of the discontinuities have implications for rainfall over the subcontinent, with the lower layers in particular acting as a vertical boundary to turbulence and mixing, and thus hindering the development of convective precipitation. / AC 2018

South Africa is currently undergoing a process of political change. Educational renewal inevitably will be an important part of the restructuring of that society. This study examines the use of school textbooks as instruments of domination. It explores the proposition that the dominant ideology in a society is perpetuated by the discourse in school textbooks, while at the same time the voices of subordinated people are silenced within textbooks. To investigate these notions, the study analyzes the discourse in a South African high school geography curriculum and textbook, to search for discursive strategies which perpetuate the dominant ideology of apartheid. Apartheid ideology is dedicated to maintaining white supremacy. In practice, apartheid means the spatial separation of the population along racial/ethnic lines. Therefore apartheid shaped South Africa's space and environment. The study is informed by theoretical perspectives of power relations which explore the nexus among power, knowledge, and discourse. Discursive strategies used in the text to silence the voices of subordinated people are identified. This provides geographers, and others involved with textbooks, with a tool to analyze textbooks. Measures are proposed which could be implemented to give voice in curricula and textbooks to marginalized people. / Master of Science