Relevant bibliographies by topics / African rivers

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  1. Journal articles
  2. Dissertations / Theses
  3. Books
  4. Book chapters
  5. Conference papers
  6. Reports

Academic literature on the topic 'African rivers'

Author: Grafiati
Published: 4 June 2021
Last updated: 1 February 2022

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Journal articles on the topic "African rivers"

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van Gorder, Christian. "Beyond the Rivers of Africa: The Afrocentric Pentecostalism of Mensa Otabil." Pneuma 30, no. 1 (2008): 33–54. http://dx.doi.org/10.1163/157007408x287768.

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AbstractMensa Otabil is an African Pentecostal who has developed an Afrocentric focus as a way of responding to the initiatives and interest that face today's growing African Pentecostal church. Otabil warns African Americans that questions of their relationship with Africa must be addressed. Perhaps Otabil's legacy will be his most immediate role of a motivational speaker and encourager for progress in a part of the world that has been drowned with both internal and external projections of pessimism. What is certain is that Mensa Otabil believes in a Pentecostal faith which is able to speak to Africa's social needs. His conviction is rooted in his conviction that the inherent strength of the great people of Africa is yet to be fully released.
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Patel, Jayanti K. "African Settlements in Gujarat." India Quarterly: A Journal of International Affairs 42, no. 3 (July 1986): 238–46. http://dx.doi.org/10.1177/097492848604200302.

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Indian settlements in Africa are a well-known fact. Studies have been made about their presence and problems. Similarly, there are some African settlements in India. Their presence was first noted by T.H. Esquire as far back as 1926.1 However, so far their presence was noted as a novelty or only in Census Reports. Recently some studies about their social and economic activity have been published. There are some African settlements in Gujarat as Gujarat has had a long tradition of trade with the eastern coast of Africa. The total population of these Africans in Gujarat is nearly five thousand; 3000 of them stay in Saurashtra.2 In the Junagadh District of Saurashtra a small hamlet Jambur, ensconced on the fringe of the Gir Forest between the rivers Saraswati and Karkari, is inhabited entirely (population 500) by Africans.3 Other than this the Africans are settled in mixed areas of Broach, Kutch and Ahmedabad district in Gujarat.
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King, Jackie, and Cate Brown. "Africa's Living Rivers: Managing for Sustainability." Daedalus 150, no. 4 (2021): 240–59. http://dx.doi.org/10.1162/daed_a_01882.

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Abstract Africa's human population is growing rapidly and is set to account for 40 percent of global numbers by 2100. Further development of its inland waters, to enhance water and energy security, is inevitable. Will it follow the development pathway of industrialized countries, often destructive of ecosystems, biodiversity, and river-dependent social structures, or can it chart a new way into the future based on global lessons of equity and sustainability? This essay tracks the global and African growth of the benefits and costs of water resource developments, explores the reasons for the costs, and offers insights on new scientific thinking that can help guide Africa to a more sustainable future.
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da Cunha, L. C., and E. T. Buitenhuis. "Riverine influence on the tropical Atlantic Ocean biogeochemistry." Biogeosciences 10, no. 10 (October 9, 2013): 6357–73. http://dx.doi.org/10.5194/bg-10-6357-2013.

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Abstract. We assess the role of riverine inputs of N, Si, Fe, organic and inorganic C in the tropical Atlantic Ocean using a global ocean biogeochemistry model. We use a standard model scenario and three sensitivity tests to investigate the role of total river nutrient and carbon inputs, as well as the western (South American) and eastern (African) river inputs on the tropical Atlantic Ocean biogeochemistry, between 20° S–20° N and 70° W–20° E. Increased nutrient availability from river inputs in this area (compared to a sensitivity scenario without river nutrient inputs, NO_RIVER) leads to an increase in primary production (PP) and export production (EP), mainly in the coastal ocean area (modeled ocean area with bathymetry <200 m). Model results suggest an enhanced N-fixation by diazotrophs on the tropical Atlantic mainly in open ocean areas. The increased rate of N-fixation in the TODAY scenario is proportional to the increase in PP and EP relative to the NO_RIVER scenario, and may support up to 14% of the coastal ocean export production. Inputs from South American rivers have an impact in coastal PP and EP two times higher than those from African rivers. On the other hand, results suggest that the contribution of African and South American rivers to the total increase in open ocean PP and EP is similar. Considering the amount of delivered nutrients (2–3 times less nutrients and carbon inputs by African rivers) one concludes that African riverine inputs may have a larger impact on the whole tropical Atlantic Ocean biogeochemistry. This is probably due to a combination of nutrient trapping in upwelling areas off the large rivers' outflows and shallow mixed layers in the eastern tropical Atlantic, concomitantly to the differences in delivered nutrient ratios leading to alleviation in limitation conditions, mainly for diatoms. When river inputs are added to the model, we estimate a modest decrease in open ocean sea-air CO2 fluxes (−5.2 Tg C a−1) and an increase in coastal ocean CO2 fluxes, mainly provoked by the remineralization of riverine organic matter delivered by the South American rivers.
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Mudumbi, J. B. N., S. K. O. Ntwampe, F. M. Muganza, and J. O. Okonkwo. "Perfluorooctanoate and perfluorooctane sulfonate in South African river water." Water Science and Technology 69, no. 1 (October 17, 2013): 185–94. http://dx.doi.org/10.2166/wst.2013.566.

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This study examined the prevalence of perfluorooctanoate (PFOA) and perfluorooctane sulfonate (PFOS) in river water samples (n = 56) and suspended solids (n = 5) from three major Western Cape rivers, in South Africa. Solid phase extraction (SPE) followed by liquid chromatography combined with electrospray tandem mass spectrometry (LC-MS/MS) using an analytical method developed in ISO 25101 (2009), PFOS and PFOA concentration in river water and in suspended solids from the rivers was investigated and quantified. From the results, PFOA and PFOS were detected in all the river water samples and were found in concentrations up to 314 and 182 ng/L for Diep River; 390 and 47 ng/L for Salt River; and 146 and 23 ng/L for Eerste River, respectively. In suspended solids, concentrations for PFOS and PFOA were 28 and 26 ng/g for Diep River; 16 and less than limit of detection for Eerste River; and 14 and 5 ng/g for Salt River, respectively. Some of these concentrations are higher than those previously reported in similar studies in various countries, and this suggests there is a cause for concern, in the Western Cape, South Africa, particularly in catchments where river and ground water is drawn for agricultural purposes in the province.
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Hugueny, Bernard, and Didier Paugy. "Unsaturated Fish Communities in African Rivers." American Naturalist 146, no. 1 (July 1995): 162–69. http://dx.doi.org/10.1086/285792.

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Hamann, Yvonne, Werner Ehrmann, Gerhard Schmiedl, and Tanja Kuhnt. "Modern and late Quaternary clay mineral distribution in the area of the SE Mediterranean Sea." Quaternary Research 71, no. 3 (May 2009): 453–64. http://dx.doi.org/10.1016/j.yqres.2009.01.001.

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AbstractThe present-day clay mineral distribution in the southeastern Levantine Sea and its borderlands reveals a complex pattern of different sources and distribution paths. Smectite dominates the suspended load of the Nile River and of rivers in the Near East. Illite sources are dust-bearing winds from the Sahara and southwestern Europe. Kaolinite is prevalent in rivers of the Sinai, in Egyptian wadis, and in Saharan dust. A high-resolution sediment core from the southeastern Levantine Sea spanning the last 27 ka shows that all these sources contributed during the late Quaternary and that the Nile River played a very important role in the supply of clay. Nile influence was reduced during the glacial period but was higher during the African Humid Period. In contrast to the sharp beginning and end of the African Humid Period recorded in West African records (15 and 5.5 ka), our data show a more transitional pattern and slightly lower Nile River discharge rates not starting until 4 ka. The similarity of the smectite concentrations with fluctuations in sea-surface temperatures of the tropical western Indian Ocean indicates a close relationship between the Indian Ocean climate system and the discharge of the Nile River.
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Kofron, Christopher P. "Status and habitats of the three African crocodiles in Liberia." Journal of Tropical Ecology 8, no. 3 (August 1992): 265–73. http://dx.doi.org/10.1017/s0266467400006490.

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ABSTRACTA representative sample of waterways in Liberia was surveyed for crocodiles, and all three species of African crocodiles were observed. Contrary to previous reports, only Nile crocodiles inhabit the Monrovia mangrove swamps and brackish-water mouths of rivers; there are no slendersnouted or dwarf crocodiles in these habitats. There is partitioning of habitats among the three species in Liberia: Nile crocodiles in mangrove swamps and river mouths (brackish water); slendersnouted crocodiles in rivers through rain forest (freshwater); and dwarf crocodiles in small streams through rain forest (freshwater), some entering the adjacent river. Dwarf crocodiles utilize burrows in the stream banks.Nowhere are crocodiles abundant, and there is an apparent absence of adults. Although 40% of Liberia is forested, deforestation is occurring rapidly by foreign timber companies and slash-and-burn agriculture practised by the largely rural population. Hunting with firearms, although illegal, is widespread, both for subsistence and commercially, without concern for depletion. Mangrove ecosystems near human population centres are being destroyed. The combination of the above factors has apparently depleted the crocodile populations in Liberia.
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Brautigam, Deborah, and Jyhjong Hwang. "Great walls over African rivers: Chinese engagement in African hydropower projects." Development Policy Review 37, no. 3 (February 7, 2019): 313–30. http://dx.doi.org/10.1111/dpr.12350.

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Lezine, Anne-Marie, and Jean-Pierre Cazet. "High-Resolution Pollen record from Core KW31, Gulf of Guinea, Documents the History of the Lowland Forests of West Equatorial Africa since 40,000 yr ago." Quaternary Research 64, no. 3 (November 2005): 432–43. http://dx.doi.org/10.1016/j.yqres.2005.08.007.

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AbstractPollen data from core KW31 recovered off the mouth of the Niger River (3°31′1N–05°34ʺ1E; 1181 m water depth) provide an exceptional record of vegetation changes in the West African lowlands between 40,000 and 3500 cal yr B.P. The highly diverse microflora testify for the permanency of rain and secondary forests in the Niger river catchment, at least as gallery formations along rivers, during the last glacial period when dry conditions occurred in relation to enhanced trade-wind circulation. The direct consequence of the post-glacial warming and the correlative increase in monsoon fluxes over West Africa was the increase in forest diversity and the expansion of rain and secondary forests on the nearby continent. Comparison between KW31 pollen record and continental pollen data from 5°S to 25°N allows the evaluation of migration rates of tropical forest populations throughout North West Africa at the beginning of the Holocene and the vegetation response to the shift toward aridity recorded widely at the end of the African Humid Period around 4000 cal yr B.P.
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Dissertations / Theses on the topic "African rivers"

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Gooch, Catherine. "“I’VE KNOWN RIVERS:” REPRESENTATIONS OF THE MISSISSIPPI RIVER IN AFRICAN AMERICAN LITERATURE AND CULTURE." UKnowledge, 2019. https://uknowledge.uky.edu/english_etds/97.

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My dissertation, titled “I’ve Known Rivers”: Representations of the Mississippi River in African American Literature and Culture, uncovers the impact of the Mississippi River as a powerful, recurring geographical feature in twentieth-century African American literature that conveys the consequences of capitalist expansion on the individual and communal lives of Black Americans. Recent scholarship on the Mississippi River theorizes the relationship between capitalism, geography, and slavery. Walter Johnson’s River of Dark Dreams: Slavery and Empire in the Cotton Kingdom, Sven Beckert’s Empire of Cotton: A Global History, and Edward Baptist’s The Half Has Never Been Told: Slavery and the Making of American Capitalism examine how enslaved black labor contributed to the expansion of capitalism in the nineteenth century, but little is known about artistic representations of the Mississippi in the twentieth century. While scholars point primarily to the Mississippi River’s impact on slavery in the nineteenth century, I’ve Known Rivers reveals how black writers and artists capture the relationship between slavery, capitalism, and the Mississippi River. I consider a wide variety of texts in this study, from Richard Wright’s Uncle Tom’s Children and early 20th century Blues music, to late 20th century novels such as Toni Morrison’s Sula. This broad array of interdisciplinary texts illustrates a literary tradition in which the Mississippi’s representation in twentieth-century African American literature serves as both a reflection of the continuously changing economic landscape and a haunting reminder of slavery’s aftermath through the cotton empire. Furthermore, I’ve Known Rivers demonstrates how traumatic sites of slavery along the river are often reclaimed by black artists as source of empowerment, thereby contributing a long overdue analysis of the Mississippi River in African American literature as a potent symbol of racial progress.
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Ractliffe, Sylvia Georgiana. "Disturbance and temporal variability in invertebrate assemblages in two South African rivers." Doctoral thesis, University of Cape Town, 2009. http://hdl.handle.net/11427/12522.

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This thesis presents an examination of the relationship between floods as disturbances, the disturbance regime and the temporal dynamics of invertebrate assemblages, over the short term and at intra- and inter-annual time scales in the Molenaars and Berg Rivers in the Western Cape of South Africa. Invertebrate responses to individual floods were investigated by a field study that links the displacement of river-bed stones by a flood to change in invertebrate densities and community and population structure from before to after flood events. The magnitude of the hydraulic force acting on each marked stone during the peak of each flood was also calculated, providing a second measure of physical disturbance. Multivariate analyses of similarity, hierarchical clustering and multidimensional scaling were used for analysis of invertebrate patterns before and after floods. Size frequency data for 28 species or genera were analysed to explore changes in population structure over the flood season. Flood records were developed from the daily discharge hydrological record of both study rivers collected by the South African Department of Water Affairs and Forestry. Flood frequency analysis and descriptive statistics were combined with graphical methods to describe the flood regime and to test flood predictability in these rivers. Quantitative monthly samples of invertebrates from the Molenaars River collected over 17 months were used together with a further 2 ½ years of semi-quantitative monthly data, to identify intra- and inter-annual patterns in communities. Multivariate analysis of community patterns was combined with a range of indices that reflect community persistence and stability over periods longer than one generation. Population dynamics of the common species were also studied. Life history attributes, specifically seasonality of life cycle stages and generation time, were explored using size frequency data from the samples.
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Slaughter, Andrew Robert. "Modelling the relationship between flow and water quality in South African rivers." Thesis, Rhodes University, 2011. http://hdl.handle.net/10962/d1006196.

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The National Water Act (Act 36 of 1998) provides for an ecological Reserve as the quantity (flow) and quality of water needed to protect aquatic ecosystems. While there are methods available to quantify the ecological Reserve in terms of flow, methods of linking flow to water quality are lacking. Therefore, the research presented in this thesis investigated various modelling techniques to estimate the effect of flow on water quality. The aims of the research presented in this thesis were: Aim 1: Can the relationship between flow and water quality be accurately represented by simple statistical models? Aim 2: Can relatively simple models accurately represent the relationship between flow and water quality? Aim 3: Can the effect of diffuse sources be omitted from a water quality model and still obtain realistic simulations, and if so under what conditions? Aim 4: Can models that solely use historical monitoring data, accurately represent the relationships between flow and water quality? In Chapter 3, simple Q-C regressions of flow and water quality were investigated using Department of Water Affairs (DWA) historical monitoring data. It was found that while flow versus salinity regressions gave good regression fits in many cases, the Q-C regression approach is limited. A mechanistic/statistical model that attempted to estimate the point and diffuse signatures of nutrients in response to flow was developed in Chapter 4 using DWA historical monitoring data. The model was verified as accurate in certain case studies using observed point loading information. In Chapter 5, statistical models that link land cover information to diffuse nutrient signatures in response to flow using DWA historical data were developed. While the model estimations are uncertain due to a lack of data, they do provide an estimation of the diffuse signature within catchments where there is flow and land cover information available. Chapter 6 investigates the extension of an existing mass-balance salinity model to estimate the effect of saline irrigation return flow on in-stream salinity. The model gave accurate salinity estimates for a low order stream with little or no irrigation within its catchment, and for a permanently flowing river within a catchment used extensively for irrigation. Chapter 7 investigated a modelling method to estimate the reaction coefficients involved in nitrification using only DWA historical monitoring data. Here, the model used flow information to estimate the residence time of nutrients within the studied river reaches. While the model obtained good estimations of nitrification for the data it was applied to, very few DWA data sets were suitable for the model. Chapter 8 investigated the ability of the in-stream model QUAL2K to estimate nutrient concentrations downstream of point and diffuse inputs of nutrients. It was found that the QUAL2K model can give accurate results in cases where point sources dominate the total nutrient inputs into a river. However, the QUAL2K simulations are too uncertain in cases where there are large diffuse source inputs of nutrients as the load of the diffuse inputs is difficult to measure in the field. This research highlights the problem of data scarcity in terms of temporal resolution as well as the range of constituents measured within DWA historical monitoring data for water quality. This thesis in addition argues that the approach of applying a number of models is preferable to applying one model to investigate the research aims, as particular models would be suited to particular circumstances, and the development of new models allowed the research aims of this thesis to be explored more thoroughly. It is also argued that simpler models that simulate a few key processes that explain the variation in observed data, are more suitable for implementing Integrated Water Resource Management (IWRM) than large comprehensive water quality models. From this research, it is clear that simple statistical models are not adequate for modelling the relationship between flow and water quality, however, relatively simple mechanistic models that simulate a limited number of processes and water quality variables, can provide accurate representations of this relationship. Under conditions where diffuse sources are not a major factor within a catchment, models that omit diffuse sources can obtain realistic simulations of the relationship between flow and water quality. Most of the models investigated in this thesis demonstrate that accurate simulations of the relationships between flow and water quality can be obtained using solely historical monitoring data.
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Jennings, Michael Evan. "Nutrient dynamics in and offshore of two permanently open South African estuaries with contrasting fresh water inflow." Thesis, Rhodes University, 2006. http://hdl.handle.net/10962/d1005421.

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The nutrient dynamics in two contrasting estuaries and in the adjacent nearshore environment along the south-east coast of South Africa was investigated seasonally. Due to an inter-basin transfer of water from the Gariep Dam to the Great Fish River, the Great Fish estuary is a fresh water dominated, terrestrially driven system with an annual fresh water inflow of 250 – 650 x 10⁶ m³ per year. In contrast, the Kariega estuary is a fresh water deprived, marine dominated system with a fresh water inflow estimated at 2.5 – 35 x 10⁶ m³per year. The reduced fresh water inflow into the estuary is attributed to regular impoundments along the Kariega River. Water samples were collected from surface and subsurface layers along the length of the estuaries as well as from a series of transects occupied in the nearshore environment. Samples were analysed for nitrate, nitrite, ammonium, phosphate and silicate. Temperature and salinity were recorded at each station. A Land-Ocean Interactions in the Coastal Zone (LOICZ) budget was constructed for each estuary to describe the role of ecosystem-level metabolism as either a sink or a source of phosphorus, nitrogen and carbon. Seasonal variation in physico-chemical properties and nutrient concentrations in the Kariega estuary was minimal due to constant low inflow, while in the Great Fish estuary, concentrations varied in response to changes in flow rate. Nutrient concentrations were consistently higher in the Great Fish estuary than in the Kariega estuary, largely reflecting differences in fresh water inflow. During periods of high flow (32.92 m³.s⁻¹in the Great Fish River) dissolved inorganic nitrogen (DIN) concentrations in the Great Fish estuary were an order of magnitude higher than those recorded in the Kariega estuary. Results of the LOICZ budgeting procedures revealed that in spite of the contrasting hydrodynamic features, the estuaries behave in largely the same manner – both predominantly sources of nutrients with heterotrophic processes dominating over autotrophic actions and both were net denitrifyers during all surveys. This was, however, due to different sets of processes operating in the two estuaries, namely low nutrient concentrations resulting in microbial activity in the Kariega estuary, and riverine influx of nutrients and phytoplankton combined with a short residence time of the water in the Great Fish estuary. In the marine nearshore environment, higher nutrient concentrations were recorded adjacent to the Great Fish estuary than offshore of the Kariega estuary. This was due to a surface plume of less saline water leaving the Great Fish estuary, which acted as an ‘outweller’ of nutrients. Offshore of the Kariega estuary, on the other hand, the nutrient concentrations were characteristic of marine waters due to a lack of fresh water outflow from the estuary. Nutrient concentrations in the marine environment adjacent to the Kariega estuary were, at times, higher than those recorded within the estuary. This observation supports previous statements which suggest that the Kariega estuary is not an ‘outweller’ of dissolved nutrients and particulate material, but rather an extension of the marine environment.
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Abdalla, Siddig Abdalla Talha. "Measurements and Applications of Radon in South African Aquifer and River Waters." Thesis, Bellville : University of the Western Cape, 2009. http://etd.uwc.ac.za/usrfiles/modules/etd/docs/etd_gen8Srv25Nme4_7089_1275508176.pdf.

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De, la Rey Pieter Arno. "Evaluation of the applicability of diatom based indices as bioindicators of water quality in South African rivers / Pieter Arno de la Rey." Thesis, North-West University, 2008. http://hdl.handle.net/10394/3690.

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Diatoms have been proven to be reliable indicators of water quality in many countries of the world particularly Europe. The potential use of diatoms as indicators of water quality in South Africa was tested in the studies in this document. This study evaluates the potential use of diatom based indices by testing it against a macroinvertebrate index (SASS 5) and evaluating the variation in the index scores of the two indices due to changes in chemical water quality and habitat. It was concluded that the diatom monitoring system performs well as bioindicator of water quality. It was also concluded that it should be used as a complementary system to the much used SASS 5 invertebrate index. This conclusion was made due to the fact that diatoms react more directly to changes in water quality than macroinvertebrates (SASS 5), and macroinvertebrates react more readily to changes in habitat than diatoms. A further part of the study was to assess whether aut-ecological or diversity based diatom indices performed best in South African conditions. This study found that the ecological indices were more sensitive to changes in water quality than the diversity indices. The diatom based indices that performed best as water quality indicators were the specific pollution sensitivity index (SPI) and the biological diatom index (BDI). A standard method for the sampling, preparation and enumeration for diatoms to be used for index score generation is also suggested to ensure the comparability of diatom based index data to facilitate use of such bio monitoring data for management purposes. The main focus of the study was to eliminate some of the obstacles for the use of diatoms as bio indicators of water quality in South Africa. It is believe that this aim has been accomplished in the study.
Thesis (Ph.D. (Environmental Science))--North-West University, Potchefstroom Campus, 2008.
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Gordon, A. K. (Andrew K). "Assessing the effect of a laundry detergent ingredient (LAS) on organisms of a rural South African river." Thesis, Rhodes University, 2012. http://hdl.handle.net/10962/d1006201.

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Powdered laundry detergents are consumed in high volumes worldwide. Post use, they are directed toward water resources via wastewater treatment works or, as is the situation in many rural areas of South Africa, they enter the environment directly as a result of laundry washing activity undertaken alongside surface waters. Within wastewater treatment works, the main ingredient in powdered laundry detergents, the narcotic toxin linear alkylbenzene sulfonate (LAS), is mostly removed, rendering the waste stream a negligible risk to the aquatic biota of receiving waters. In contrast, the biological and ecological impacts of direct LAS input to the aquatic environment, as a consequence of near-stream laundry washing, are yet to be fully realised. Consequently, this thesis posed two research questions: 1) 'What are the LAS concentrations in a small rural South African river'? and 2) 'Is the in-stream biological community negatively affected at these concentrations?' The chosen study area, the community of Balfour in the Eastern Cape Province, is like many rural areas of South Africa where inadequate provision of piped water to homesteads necessitates laundry washing alongside the nearby Balfour River. The first research question was addressed in two ways: by predicting LAS concentrations in Balfour River water by assessing detergent consumption and laundry washing behaviour of residents living alongside the river; and measuring actual in- stream LAS concentrations on different days of the week and during different seasons. Results indicated that LAS concentrations were highly variable temporally and spatially. High peak concentrations of LAS occurred infrequently and were limited to the immediate vicinity of near-stream laundry washing activity with the highest measured concentration being 342 μg.L ⁻¹ and the average 21 μg.L ⁻¹ over the sampling period. The second research question was addressed by integrating the chemical evidence, determined from the first research question, with the biological evidence of stress responses measured in macroinvertebrates collected downstream of near-stream laundry washing activity on the Balfour River. Predicted and measured LAS exposure concentrations from the Balfour River were compared to a water quality guideline for LAS (304 μg.L ⁻¹), specifically derived in this thesis. Biological stress responses were measured at different levels of organisation: two sub-cellular responses (lipid peroxidation and cholinesterase activity); three measures of macroinvertebrate tolerance to water quality impairment; five measures of community composition; three measures of community richness; and a surrogate measure of ecosystem function (functional feeding groups). Weight-of-evidence methodology was utilised to assess, integrate and interpret the chemical and biological evidence, and at its conclusion, determined no effect on the in-stream biological community of the Balfour River downstream of laundry washing activity.
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Fox, John Tyler. "Spatiotemporal Patterns and Drivers of Surface Water Quality and Landscape Change in a Semi-Arid, Southern African Savanna." Diss., Virginia Tech, 2016. http://hdl.handle.net/10919/81462.

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The savannas of southern Africa are a highly variable and globally-important biome supporting rapidly-expanding human populations, along with one of the greatest concentrations of wildlife on the continent. Savannas occupy a fifth of the earth's land surface, yet despite their ecological and economic significance, understanding of the complex couplings and feedbacks that drive spatiotemporal patterns of change are lacking. In Chapter 1 of my dissertation, I discuss some of the different theoretical frameworks used to understand complex and dynamic changes in savanna structure and composition. In Chapter 2, I evaluate spatial drivers of water quality declines in the Chobe River using spatiotemporal and geostatistical modeling of time series data collected along a transect spanning a mosaic of protected, urban, and developing urban land use. Chapter 3 explores the complex couplings and feedbacks that drive spatiotemporal patterns of land cover (LC) change across the Chobe District, with a particular focus on climate, fire, herbivory, and anthropogenic disturbance. In Chapter 4, I evaluated the utility of Distance sampling methods to: 1) derive seasonal fecal loading estimates in national park and unprotected land; 2) provide a simple, standardized method to estimate riparian fecal loading for use in distributed hydrological water quality models; 3) answer questions about complex drivers and patterns of water quality variability in a semi-arid southern African river system. Together, these findings have important implications to land use planning and water conservation in southern Africa's dryland savanna ecosystems.
Ph. D.
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Dollar, E. S. J. "The determination of geomorphologically effective flows for selected eastern sea-Board Rivers in South Africa." Thesis, Rhodes University, 2001. http://hdl.handle.net/10962/d1005499.

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In South Africa the need to protect and manage the national water resource has led to the development of the Reserve as a basic right under the National Water Act (1998). The Ecological Reserve relates to the quality and quantity of water necessary to protect the sustainable functioning of aquatic ecosystems. The geomorphological contribution to setting the Reserve has focussed on three groups of information requirements: the spatial and temporal availability of habitat, the maintenance of substratum characteristics, and the maintenance of channel form. This thesis focusses on the second and third information requirements. The thesis has attempted to achieve this by adding value to the theoretical and applied understanding of the magnitude and frequency of channel forming discharge for selected southern African rivers. Many of the eastern sea-board rivers are strongly influenced by bed rock in the channel perimeter, and by a highly variable hydrological regime. This has resulted in characteristic channel forms, with an active channel incised into a larger macro-channel being a common feature of eastern seaboard rivers. Within the active channel inset channel benches commonly occur. This alluvial architecture is used to provide clues as to the types of flows necessary to meet the Reserve. Three river basins are considered : the Mkomazi, Mhlathuze and Olifants. The Mkomazi is a relatively un-impacted perennial eastern-sea board river and forms the research component of the study. The Mhlathuze and Olifants rivers are highly regulated systems and form the application component of the study. Utilising synthesised daily hydrological data, bed material data, cross-sectional surveys, hydraulic data and relevant bed material transport equations, channel form was related to dominant discharge and effective discharge in an attempt to identify the magnitude and frequency offlows that can be considered to be ' effective'. Results from the Mkomazi River indicate that no single effective discharge exists, but rather that there is a range of effective discharges in the 5-0.1% range on the 1-day daily flow duration curves that are responsible for the bulk (>80%) of the bed material transport. Only large floods (termed 'reset'discharges) with average return periods of around 20 years generate sufficient stream power and shear stress to mobilise the entire bed. The macro-channel is thus maintained by the large ' reset' flood events, and the active channel is maintained both by the range of effective discharges and the ' reset 'discharges. These are the geomorphologically 'effective' flows. Results from the Mhlathuze River have indicated that the Goedertrouw Dam has had a considerable impact on the downstream channel morphology and bed material transport capacity and consequently the effective and dominant discharges. It has been suggested that the Mhlathuze River is now adjusting its channel geometry in sympathy with the regulated flow environment. Under present-day conditions it has been demonstrated that the total bed material load has been reduced by up to three times, but there has also been a clear change in the way in which the load has been distributed around the duration curve. Under present-day conditions, over 90% of the total bed material load is transported by the top 5% of the flows, whereas under virgin flow conditions 90% of the total bed material load was transported by the top 20% of the flows. For the Olifants River there appears to be no relationship between the estimated bankfull discharge and any hydrological statistic. The effective discharge flow class is in the 5-0.01% range on the 1-day daily flow duration curve. It has also been pointed out that even the highest flows simulated for the Olifants River do not generate sufficient energy to mobilise the entire bed. It is useful to consider the Olifants River as being adapted to a highly variable flow regime. It is erroneous to think of one ' effective' discharge, but rather a range of effective discharges are of significance. It has been argued that strong bed rock control and a highly variable flow regime in many southern African rivers accounts for the channel architecture, and that there is a need to develop an ' indigenous knowledge' in the management of southern African fluvial systems
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Newman, Natalie Nicolette. "The impact of altered river structure on the function of selected urban Cape Town rivers." Thesis, Cape Peninsula University of Technology, 2010. http://hdl.handle.net/20.500.11838/2029.

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Thesis (MTech (Nature Conservation))--Cape Peninsula University of Technology, 2010.
Many urban rivers are heavily engineered and no longer function naturally. The City of Cape Town has designed and implemented many stormwater and river management projects. Very little monitoring has occurred as to whether these engineering projects and remediation measures, have had a positive effect on our urban river ecosystem function. The study investigated the influence of specific engineering interventions such as the placement or rocks in stream to create weirs, gabion lining of stream channels, removal of canal walls, establishment of artificial wetlands, and approaches to urban river management, on river ecosystem function of the Keysers River, Little Lotus River, Langevlei Canal, Silvermine River, Moddergat River and Big Lotus River, as measured by specific indices including water chemistry and aquatic community structure (macroinvertebrates and diatoms).
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Books on the topic "African rivers"

1

Opesan, Ola. Many rivers to cross. London: X Press, 1996.

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Two Rivers. Thorndike, Me: Center Point Pub., 2009.

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Two rivers. New York: Kensington Books, 2009.

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Lotriet, H. H. River discharge measurement in South African rivers: The development of improved measuring techniques. Pretoria: Water Research Commission, 1995.

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Hughes, Langston. The Negro speaks of rivers. New York: Disney Jump at the Sun Books, 2009.

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Crossing the Zambezi: The politics of landscape on a Central African frontier. Woodbridge, UK: James Currey, 2009.

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McGregor, JoAnn. Crossing the Zambezi: The politics of landscape on a Central African frontier. Woodbridge, UK: James Currey, 2009.

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I've known rivers: Lives of loss and liberation. Reading, Mass: Addison-Wesley Pub., 1994.

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Darko, Morrell Johnson. The rivers meet: A history of African-Americans in Rome, Georgia. Rome, GA: M. Darko, 2003.

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John, Mason. Olóòkun: Owner of rivers and seas. Brooklyn, N.Y: Yorùbá Theological Archministry, 1996.

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Book chapters on the topic "African rivers"

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Rosengarten, Dale. "By the Rivers of Babylon: The Lowcountry Basket in Slavery and Freedom." In African Ethnobotany in the Americas, 123–52. New York, NY: Springer New York, 2012. http://dx.doi.org/10.1007/978-1-4614-0836-9_5.

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Balek, J. "Hydrology of Wetlands in the Headwaters of Great African Rivers." In NATO Science Series: IV: Earth and Environmental Sciences, 203–10. Dordrecht: Springer Netherlands, 2006. http://dx.doi.org/10.1007/1-4020-4228-0_17.

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Akiiki, Robert Kugonza. "Not All Dams in Africa Are Developmental: Advocacy Perspectives from the African Rivers Network." In Water, Cultural Diversity, and Global Environmental Change, 339–47. Dordrecht: Springer Netherlands, 2011. http://dx.doi.org/10.1007/978-94-007-1774-9_24.

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Gichuhi, Getrude, and Stephen Gitahi. "Sustainable Urban Drainage Practices and Their Effects on Aquifer Recharge." In African Handbook of Climate Change Adaptation, 1–19. Cham: Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-42091-8_67-1.

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AbstractBetween 1994 and 2006, an 18% increase of freshwater flow into the earth’s ocean was recorded, as well as extreme weather events such as prolonged drought and intense floods. Following this period was an era of increased evaporation from oceans and seas, which heightened global warming in Africa. This chapter proposes the use of man-made aquifers recharge processes as methods of draining water into the soil before the runoff water reaches water bodies. Source control involves controlling the volume of water entering drainage systems or rivers by cutting off runoff water through storing for reuse or evapotranspiration as seen in green roofs. Pre-treatment is the use of trenches to filter and remove contaminants from water before getting to water bodies. Retention systems on the other hand is controlling the rate at which water is discharged to waterways by providing water storage areas such as ponds, water retention areas, etc., while Infiltration Systems are areas that allow natural soaking of stormwater runoff to the ground naturally recharging the water table. The proposed methods will see replenishing of the water table, a great leap in the efforts of curbing global warming. This practice can easily be adopted by both individuals and government as we build more and more buildings creating a balance between the need for human settlement and the natural way of water replenishing itself. The methods do not introduce extra costs to an already existing budget. In some cases, the methods help to reduce the costs of projects especially in urban areas. Africa which hosts many of the growing countries sees and will continue to experience surges in urbanization. For such, these methods presented in this topic will be, if implemented, a best method to solve the urban drainage problems before this even occurs.
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Gichuhi, Getrude, and Stephen Gitahi. "Sustainable Urban Drainage Practices and Their Effects on Aquifer Recharge." In African Handbook of Climate Change Adaptation, 809–27. Cham: Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-45106-6_67.

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AbstractBetween 1994 and 2006, an 18% increase of freshwater flow into the earth’s ocean was recorded, as well as extreme weather events such as prolonged drought and intense floods. Following this period was an era of increased evaporation from oceans and seas, which heightened global warming in Africa. This chapter proposes the use of man-made aquifers recharge processes as methods of draining water into the soil before the runoff water reaches water bodies. Source control involves controlling the volume of water entering drainage systems or rivers by cutting off runoff water through storing for reuse or evapotranspiration as seen in green roofs. Pre-treatment is the use of trenches to filter and remove contaminants from water before getting to water bodies. Retention systems on the other hand is controlling the rate at which water is discharged to waterways by providing water storage areas such as ponds, water retention areas, etc., while Infiltration Systems are areas that allow natural soaking of stormwater runoff to the ground naturally recharging the water table. The proposed methods will see replenishing of the water table, a great leap in the efforts of curbing global warming. This practice can easily be adopted by both individuals and government as we build more and more buildings creating a balance between the need for human settlement and the natural way of water replenishing itself. The methods do not introduce extra costs to an already existing budget. In some cases, the methods help to reduce the costs of projects especially in urban areas. Africa which hosts many of the growing countries sees and will continue to experience surges in urbanization. For such, these methods presented in this topic will be, if implemented, a best method to solve the urban drainage problems before this even occurs.
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Allanson, B. R., R. C. Hart, J. H. O’Keeffe, and R. D. Robarts. "Unique rivers." In Inland Waters of Southern Africa: An Ecological Perspective, 83–96. Dordrecht: Springer Netherlands, 1990. http://dx.doi.org/10.1007/978-94-009-2382-9_6.

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Lévêque, C., J. M. Hougard, V. Resh, B. Statzner, and L. Yaméogo. "Freshwater ecology and biodiversity in the tropics: what did we learn from 30 years of onchocerciasis control and the associated biomonitoring of West African rivers?" In Aquatic Biodiversity, 23–49. Dordrecht: Springer Netherlands, 2003. http://dx.doi.org/10.1007/978-94-007-1084-9_2.

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Adeleye, Ifedapo, Franklin Ngwu, Nkemdilim Iheanachor, Ebes Esho, Chijioke Oji, Theresa Onaji-Benson, and Chris Ogbechie. "Banking on Africa: Can Emerging Pan-African Banks Outcompete Their Global Rivals?" In Africa’s Competitiveness in the Global Economy, 113–36. Cham: Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-319-67014-0_5.

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Macpherson, C. N. L., and P. S. Craig. "Onchocerciasis -river blindness." In Parasitic helminths and zoonoses in Africa, 138–203. Dordrecht: Springer Netherlands, 1991. http://dx.doi.org/10.1007/978-94-011-3054-7_6.

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Kamali, Leila. "“Words Without Sound”: Caryl Phillips’s Crossing the River." In The Cultural Memory of Africa in African American and Black British Fiction, 1970-2000, 153–84. New York: Palgrave Macmillan US, 2016. http://dx.doi.org/10.1057/978-1-137-58171-6_6.

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Conference papers on the topic "African rivers"

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Osaro, N., and E. Wokekoro. "Conditions of Public Secondary Schools in Rivers State, Nigeria." In 18th African Real Estate Society Conference. African Real Estate Society, 2018. http://dx.doi.org/10.15396/afres2018_147.

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Anderson, John Robert Beveridge. "Design and Development of the Msikaba and Mtentu River Bridges." In IABSE Conference, Kuala Lumpur 2018: Engineering the Developing World. Zurich, Switzerland: International Association for Bridge and Structural Engineering (IABSE), 2018. http://dx.doi.org/10.2749/kualalumpur.2018.0497.

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<p>The story of the Msikaba and Mtentu River Bridges is a story about the Transkei Region in South Africa. The area’s unfenced rural landscape is considered unique and is characterised by steep gorges and rivers that run down to the Wild Coast. The civil engineers of the past avoided the area and the main highway connecting the ports of Durban and East London runs 200 km inland. This is now changing with the South African National Roads Agency’s SOC Ltd (SANRAL’s) procurement of the new N2 Wild Coast Road that will realign the highway within 30 km of the coast. The project includes two new crossings, one a 580 m span cable-stayed bridge, the other a 1.1 km long viaduct with a 260 m central balanced cantilever span, across the deepest gorges on the route. Their design and procurement is however driven not only by their physical environment but the need to create jobs, business opportunities for small local enterprises and community development projects that will leave a legacy and a long term economic benefit.</p>
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Kladnik, B., G. Artac, B. Kozan, A. F. Gubina, K. Nagode, and M. Dusak. "Scheduling the Slovenian cascaded hydro system on the river Sava." In AFRICON 2011. IEEE, 2011. http://dx.doi.org/10.1109/afrcon.2011.6072098.

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PIETERSEN, JACOBUS P. J., and OCKERT J. GERICKE. "AREAL REDUCTION FACTORS FOR DESIGN RAINFALL ESTIMATION IN THE MODDER-RIET RIVER BASIN, SOUTH AFRICA." In RIVER BASIN MANAGEMENT 2019. Southampton UK: WIT Press, 2019. http://dx.doi.org/10.2495/rbm190041.

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Eze, Joy, Oluwarotimi Onakomaiya, Ademola Ogunrinde, Olusegun Adegboyega, James Wopara, Fred Timibitei, and Matthew Ideh. "Practical Experience in Rig Move and Workover Operations in an Amphibious Terrain: A Case Study of Escravos Beach Rig Move and Workover Operations." In SPE/AAPG Africa Energy and Technology Conference. SPE, 2016. http://dx.doi.org/10.2118/afrc-2582947-ms.

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ABSTRACT The exploration and production of oil and gas mostly occurs in remote locations, so as to minimize human exposure and Health Security Safety and Environment (HSSE) risks. Shell Companies in Nigeria is not any different having operated for over 50 years in Nigeria with the largest footprint of all the international oil and gas companies operating in the country spanning over land, swamp, shallow waters and offshore terrains. Shell Petroleum Development Company, the operator of a joint venture (the SPDC JV) between the government-owned Nigerian National Petroleum Corporation – NNPC (55% share), Shell (30%), Total E&P Nigeria Ltd (10%) and the ENI subsidiary Agip Oil Company Limited (5%) focuses mostly on onshore and shallow water oil and gas production in the Niger Delta with about 60+ producing oil and gas fields and a network of approximately 5,000 kilometers of oil and gas pipelines and flow lines spread across the Niger Delta. Escravos Beach is over 60km from the closest major city, Warri, a major oil and gas zone in the Niger Delta. It is bounded by the Escravos River to the East, Chevron canal to the North and the Atlantic Ocean to the South and is covered with predominantly mangrove forest especially along the creeks and consists of a number of natural and man-made waterways (rivers, creeks and canals). Unlike most other onshore operations, this location can only be accessed via the waterways; thus requiring the rig equipment and every other equipment to be channeled via the waterways and subsequently on land to arrive at the site. The amphibious nature of this operation requires a combination of onshore and swamp requirements with increased HSSE exposure, logistics requirement and cost. This paper aims to highlight the practical experience garnered in the rig move and workover operations of Rig XYZ which operated in the Escravos Beach region.
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GERICKE, OCKERT J. "DEVELOPMENT AND ASSESSMENT OF A SINGLE-EVENT DESIGN FLOOD ESTIMATION TOOL: CASE STUDY IN FOUR CLIMATOLOGICAL REGIONS OF SOUTH AFRICA." In RIVER BASIN MANAGEMENT 2019. Southampton UK: WIT Press, 2019. http://dx.doi.org/10.2495/rbm190061.

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Hounnou, Amededjihunde H. J., Frederic Dubas, Francois-Xavier Fifatin, Maurel Aza-Gnandji, Didier Chamagne, and Antoine Vianou. "Multi-Objective Optimization of Run-of-River Small Hydro-PV Hybrid Power Systems." In 2019 IEEE AFRICON. IEEE, 2019. http://dx.doi.org/10.1109/africon46755.2019.9134014.

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Mohamed, A. Elmi. "Managing shared river basins in the Horn of Africa: Ethiopian planned water projects on the Juba and Shabelle rivers and effects on downstream uses in Somalia." In RIVER BASIN MANAGEMENT 2013. Southampton, UK: WIT Press, 2013. http://dx.doi.org/10.2495/rbm130121.

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Vanhove, Daan, Steven Bouillon, Steven Bouillon, Zita Kelemen, Zita Kelemen, Lauren Graniero, Lauren Graniero, David P. Gillikin, and David P. Gillikin. "RECONSTRUCTING PAST AFRICAN RIVER HYDROLOGY BY MEANS OF FRESHWATER BIVALVE GEOCHEMISTRY." In 51st Annual Northeastern GSA Section Meeting. Geological Society of America, 2016. http://dx.doi.org/10.1130/abs/2016ne-272922.

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Kansal, Mitthan Lal, and Silas Ekadu. "Hydropolitics in Water Governance of the Nile River in Africa." In World Environmental and Water Resources Congress 2018. Reston, VA: American Society of Civil Engineers, 2018. http://dx.doi.org/10.1061/9780784481394.026.

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Reports on the topic "African rivers"

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Mpahlele, R. E., T. M. Malakalaka, and B. Hedden-Dunkhorst. Characteristics of smallholder irrigation farming in South Africa: a case study of the Arabie-Olifants River Irrigation Scheme. International Water Management Institute (IWMI), 2000. http://dx.doi.org/10.5337/2011.0040.

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