Catalogue Search | MBRL
Are you sure you want to remove the book from the shelf?
{{itemTitle}}
70
result(s) for
"Okavango River"
Sort by:
At home in the Okavango
An ethnographic portrayal of the lives of white citizens of the Okavango Delta, Botswana, this book examines their relationships with the natural and social environments of the region. In response to the insecurity of their position as a European-descended minority in a postcolonial African state, Gressier argues that white Batswana have developed cultural values and practices that have allowed them to attain high levels of belonging. Adventure is common for this frontier community, and the book follows their safari lifestyles as they construct and perform localized identities in their interactions with dangerous wildlife, the broader African community, and the global elite via their work in the nature-tourism industry.
eBook
At Home in the Okavango
An ethnographic portrayal of the lives of white citizens of the Okavango Delta, Botswana, this book examines their relationships with the natural and social environments of the region. In response to the insecurity of their position as a European-descended minority in a postcolonial African state, Gressier argues that white Batswana have developed cultural values and practices that have allowed them to attain high levels of belonging. Adventure is common for this frontier community, and the book follows their safari lifestyles as they construct and perform localized identities in their interactions with dangerous wildlife, the broader African community, and the global elite via their work in the nature-tourism industry.
eBook
Provenance of passive-margin sand (Southern Africa)
This study investigates the petrographic, mineralogical, geochronological, and geochemical signatures of river sands across southern Africa. We single out the several factors that control sand generation, including weathering and recycling, and monitor the compositional changes caused by chemical and physical processes during fluvial transport from cratonic sources to passive-margin sinks. Passive-margin sands have two first-cycle sources. Quartz and feldspars with amphibole, epidote, garnet, staurolite, and kyanite are derived from crystalline basements exposed at the core of ancient orogens and cratonic blocks (dissected continental block provenance). Volcanic rock fragments, plagioclase, and clinopyroxene are derived from flood basalts erupted during the initial phases of rifting (volcanic rift provenance). First-cycle detritus mixes invariably with quartzose detritus recycled from ancient sedimentary successions (undissected continental block provenance) or recent siliciclastic deposits (e.g., Kalahari dune sands; recycled clastic provenance). U-Pb ages of detrital zircons mirror the orogenic events that affected southern Africa since the Archean. Damara (0.5-0.6 Ga) and Namaqua (1 Ga) age peaks are prominent throughout Namibia, from the Orange mouth to the Namib and Skeleton Coast Ergs, and also characterize Kalahari dunes and sands of the Congo, Okavango, and Zambezi Rivers. Instead, sharp old peaks at 2.1 Ga and 2.6 Ga characterize Limpopo and Olifants sands, matching the age of the Bushveld intrusion and the final assembly of the Zimbabwe and Kaapvaal Cratons, respectively; discordant ages indicate Pb loss during the Pan-African event. Chemical indices confirm that weathering is minor throughout the tropical belt from South Africa and Zimbabwe to Namibia and coastal Angola but major for quartzose sands of the Congo, Okavango, and upper Zambezi Rivers, largely produced in humid subequatorial regions. Recycling of quartzose sediments is extensive in all of these catchments. From Congo to Mozambique, along the >5000-km Atlantic and Indian Ocean rifted margins, polycyclic detritus reaches commonly 50% and locally up to 100%, in line with the estimated incidence of recycling worldwide. Quantitative information provided by provenance studies of modern sands helps us to better understand the relationships between sediment composition and plate-tectonic setting and to upgrade the overly simplified and often misleading current provenance models. This is a necessary step if we want to decipher the stratigraphic record of ancient passive margins and reconstruct their paleotectonic and paleoclimatic history with greater accuracy.
Journal Article
Governing for local livelihoods in transboundary river systems: insights from the Cubango-Okavango River Basin
Climate change will present new challenges for transboundary governance of international river basins, many of which will experience increasing levels of environmental variability in the coming decades. Failure to adequately respond to these challenges will increase vulnerability for people across the globe who rely on these river systems for their livelihoods. To be effective, governance systems will need to embrace uncertainty, increase international cooperation, and authentically engage local actors in decision-making. This paper considers the potential for transnational governance that accounts for local livelihoods by presenting findings from qualitative research in Namibia and Botswana, two of the three countries located in the Cubango-Okavango River Basin of Southern Africa. Findings show the importance of local livelihoods for communities in the basin, which have been historically overlooked by governance systems, and which now face increasing threats from development and climate change. The paper illustrates how these livelihoods are governed by a complex institutional arrangement that includes national governments inclined to protect their own interests and a transnational governance body whose mission is to coordinate decision-making across the basin to support sustainable development. The paper concludes with a call for increased attention to the impacts of governance decisions on the livelihoods of river basin communities, with insights for the Cubango-Okavango River Basin specifically, as well as for international river basins more broadly.
Journal Article
Resilience in Transboundary Water Governance
When the availability of a vital resource varies between times of overabundance and extreme scarcity, management regimes must manifest flexibility and authority to adapt while maintaining legitimacy. Unfortunately, the need for adaptability often conflicts with the desire for certainty in legal and regulatory regimes, and laws that fail to account for variability often result in conflict when the inevitable disturbance occurs. Additional keys to resilience are collaboration among physical scientists, political actors, local leaders, and other stakeholders, and, when the commons is shared among sovereign states, collaboration between and among institutions with authority to act at different scales or with respect to different aspects of an ecological system. At the scale of transboundary river basins, where treaties govern water utilization, particular treaty mechanisms can reduce conflict potential by fostering collaboration and accounting for change. One necessary element is a mechanism for coordination and collaboration at the scale of the basin. This could be satisfied by mechanisms ranging from informal networks to the establishment of an international commission to jointly manage water, but a mechanism for collaboration at the basin scale alone does not ensure sound water management. To better guide resource management, study of applied resilience theory has revealed a number of management practices that are integral for adaptive governance. Here, we describe key resilience principles for treaty design and adaptive governance and then apply the principles to a case study of one transboundary basin where the need and willingness to manage collaboratively and iteratively is high—the Okavango River Basin of southwest Africa. This descriptive and applied approach should be particularly instructive for treaty negotiators, transboundary resource managers, and should aid program developers.
Journal Article
Culture, Nature, and the Valuation of Ecosystem Services in Northern Namibia
Defining culture as shared knowledge, values, and practices, we introduce an anthropological concept of culture to the ecosystem-service debate. In doing so, we shift the focus from an analysis of culture as a residual category including recreational and aesthetic experiences to an analysis of processes that underlie the valuation of nature in general. The empirical analysis draws on ethnographic fieldwork conducted along the Okavango River in northern Namibia to demonstrate which landscape units local populations value for which service(s). Results show that subjects perceive many places as providing multiple services and that most of their valuations of ecosystem services are culturally shared. We attribute this finding to common experiences and modes of activities within the cultural groups, and to the public nature of the valuation process.
Journal Article
Sensitivity of the atmospheric water cycle to corrections of the sea surface temperature bias over southern Africa in a regional climate model
Regional climate models (RCMs) have been used to dynamically downscale global climate projections at high spatial and temporal resolution in order to analyse the atmospheric water cycle. In southern Africa, precipitation pattern were strongly affected by the moisture transport from the southeast Atlantic and southwest Indian Ocean and, consequently, by their sea surface temperatures (SSTs). However, global ocean models often have deficiencies in resolving regional to local scale ocean currents, e.g. in ocean areas offshore the South African continent. By downscaling global climate projections using RCMs, the biased SSTs from the global forcing data were introduced to the RCMs and affected the results of regional climate projections. In this work, the impact of the SST bias correction on precipitation, evaporation and moisture transport were analysed over southern Africa. For this analysis, several experiments were conducted with the regional climate model REMO using corrected and uncorrected SSTs. In these experiments, a global MPI-ESM-LR historical simulation was downscaled with the regional climate model REMO to a high spatial resolution of 50 × 50 km2 and of 25 × 25 km2 for southern Africa using a double-nesting method. The results showed a distinct impact of the corrected SST on the moisture transport, the meridional vertical circulation and on the precipitation pattern in southern Africa. Furthermore, it was found that the experiment with the corrected SST led to a reduction of the wet bias over southern Africa and to a better agreement with observations as without SST bias corrections.
Journal Article