Browsing by Subject "Environmental, Society and Sustainability"

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    Lower Kuiseb River sediments and their control on dust emission
    (2013) Von Holdt, Johanna RC; Eckardt, Frank
    Previous studies, using remote sensing, have identified the Kuiseb River in Namibia as the dustiest river in Southern Africa. Dust plumes detected from this basin are mostly associated with the Lower Kuiseb River, between the end of the bedrock canyon at Natab and the Kuiseb Delta towards the Atlantic Ocean. The purpose of this study was to examine the surface materials of the Lower Kuiseb River and establish their potential towards dust production, leading to such plumes. This investigation focused predominantly on the size characteristics of 153 surface sediment samples collected from the Kuiseb main channel, its terraces, delta, gravel plain surfaces and tributaries, dunes and interdune, all of which were analysed using a Malvern Mastersizer 2000 laser diffractometer. In addition, other sediment characteristics such as mineralogy, organic matter content, soluble salts; and selected surface roughness elements were also considered. Furthermore MODIS satellite imagery was used to assess the dust emission activity from each of the geomorphological units sampled in the field for the period from 2005 to 2013. This study has demonstrated surface sediments suitable for dust production to increase towards the coast with particular "dusty" floodplain surfaces between Swartbank and Rooibank, as well as the Kuiseb Delta. It appears that silt crusts formed as the flood water dissipate, provide a main source of appropriately sized material for deflation. The crusts consist entirely of silt and clay sized material, with a maximum of 97% <63μm, 39% <10μm and 6% <μm. Dust producing surfaces of the gravel plain include the gravel plain drainage, which has the largest quantity of clay sized material (maximum of 11% <μm). Anthropogenic disturbances of the surface are likely playing a role in the production of dust, with livestock farming causing a fragmentation of crusts in the river valley, and mining and off-road driving disturbing the gravel plain.
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    Who helps women cope? : women's agency in households, families and communities
    (2005) Nomdo, Christina; Oldfield, Sophie
    Women’s experiences of poverty in post-apartheid South Africa are made real in their struggles to access resources and assets to survive. They survive sudden shocks and entrenched poverty by constructing and drawing on social support networks that provide access to adequate housing, secure tenure and sufficient income to sustain households. The social support networks of households, families and communities are investigated in the adjacent but diverse townships of Manenberg and Guguletu - resettlement areas for those who were forcibly removed from the city centre of Cape Town. Theoretical perspectives on: the South African context of support; reciprocity; social networks; and the morality inherent in networks, fail to provide information of the complexities and nuances in the lives of the women. Women are required to negotiate gender roles and position in every relationship in order to be eligible for support. Discourses on how the South African city shaped reciprocity and gender identity within households and families provide insight into the context in which support is negotiated. Drawing on these sets of literature an analysis of life histories (constructed from a semi-structured, open ended questionnaire) is conducted of fifteen women from each township that document their struggles, frustrations, joys and aspirations. The evidence from the case studies suggests that women's experiences of poverty are actualised in their marginalisation from adequate housing, secure tenure and sustainable livelihoods. Moreover, the mechanisms they employ to bridge these challenges, their support networks, further entrenches gender inequalities and the inferior position of women in society. A detailed analysis of their relationships reveals that in order to access support women sublimate their challenges of traditional gender identities in order conform to normative behaviour and access resources and assets required for survival. A comparison of the configuration, utilisation and value of strategic relationships within women's households, families and communities demonstrates their agency. The women interact with their context, making strategic decisions and choices that influence not only the social fabric of their communities but also their own identity.