Academic literature on the topic 'Sedimentation and deposition – Research – Namibia'
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Journal articles on the topic "Sedimentation and deposition – Research – Namibia"
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Huang, Shu You, Zhi Gang Yin, Jin Guang Zhang, Yu Shan Ren, and Jing Hai Zhou. "Research the Problem about the Silted Deposition of the Broken Model." Applied Mechanics and Materials 204-208 (October 2012): 279–83. http://dx.doi.org/10.4028/www.scientific.net/amm.204-208.279.
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On the foundation of the item that the residence flood controlled technique and standard tested and the analysis according to the formation of the sediment and the regulation of the sedimentation in the actual river. In the process of the studied item, design a kind of a new sedimentation basin in order to lower the sand carrying capacity of the down water in the limited distance and the biggest limit. Through the model experiment of this kind of the sedimentation basin and find out the result of the sink the sand under the different discharge, in order to guide the actual engineering application.
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Stollhofen, Harald. "Karoo synrift-deposition and its tectonic control at the evolving continental margin of Namibia." Zeitschrift der Deutschen Geologischen Gesellschaft 149, no. 4 (March 19, 1999): 519–632. http://dx.doi.org/10.1127/zdgg/149/1999/519.
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Stovin, Virginia R., and Adrian J. Saul. "Sedimentation in Storage Tank Structures." Water Science and Technology 29, no. 1-2 (January 1, 1994): 363–72. http://dx.doi.org/10.2166/wst.1994.0684.
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Although storage tanks provide an effective means of reducing the magnitude and frequency of combined sewer overflow discharges, and thereby of alleviating urban watercourse pollution, poorly designed storage structures frequently suffer from maintenance problems arising from sedimentation. The development of design guidelines that optimise the self-cleansing operation of storage structures is clearly a priority for urban drainage research. This paper describes a system that has been developed to study sediment deposition in laboratory model-scale storage structures. The patterns of deposition resulting from a selection of flow regimes are described, and the need for time-varying and time series storm tests is highlighted. Sedimentation patterns are shown to predominantly depend on the flow field, and the critical bed shear stresses for deposition and erosion in the model situation are identified. Hence, the potential application of numerical models to the design problem is discussed.
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Srivastava, Pradeep, George A. Brook, Eugene Marais, P. Morthekai, and Ashok K. Singhvi. "Depositional environment and OSL chronology of the Homeb silt deposits, Kuiseb River, Namibia." Quaternary Research 65, no. 3 (May 2006): 478–91. http://dx.doi.org/10.1016/j.yqres.2006.01.010.
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AbstractPrevious studies suggest that the Homeb silts of the Kuiseb valley, Namibia (i) accumulated in a dune-dammed lake, (ii) are end-point deposits, (iii) represent an aggrading river bed, and (iv) are slackwater deposits. Thus, they have been used alternatively as evidence of past drier conditions or past wetter conditions. Lithostratigraphic analysis of two sediment sequences at Homeb indicates sedimentation by aggradation of the Kuiseb River triggered by a transition from an arid to humid climate. OSL ages for the sequences were obtained by the SAR protocol on aliquots of 9.6-mm and 4.0-mm diameter and on single grains. Four-millimeter aliquot minimum ages closely approximate the single-grain minimum ages and are younger than 9.6-mm aliquot minimum and central ages. Based on these results, the small-aliquot (4-mm) approach appears to provide ages comparable to those obtained by the more laborious and time-consuming single-grain method. Minimum ages indicate rapid deposition of the Homeb Silts in at least two episodes centered at ∼15 ka and ∼6 ka during climate transitions from arid to humid. Flash floods eroded the valley fills during slightly more arid conditions.
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Darquenne, C., K. L. Zeman, R. C. Sá, T. K. Cooper, J. M. Fine, W. D. Bennett, and G. K. Prisk. "Removal of sedimentation decreases relative deposition of coarse particles in the lung periphery." Journal of Applied Physiology 115, no. 4 (August 15, 2013): 546–55. http://dx.doi.org/10.1152/japplphysiol.01520.2012.
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Lung deposition of >0.5-μm particles is strongly influenced by gravitational sedimentation, with deposition being reduced in microgravity (μG) compared with normal gravity (1G). Gravity not only affects total deposition, but may also alter regional deposition. Using gamma scintigraphy, we measured the distribution of regional deposition and retention of radiolabeled particles (99mTc-labeled sulfur colloid, 5-μm diameter) in five healthy volunteers. Particles were inhaled in a controlled fashion (0.5 l/s, 15 breaths/min) during multiple periods of μG aboard the National Aeronautics and Space Administration Microgravity Research Aircraft and in 1G. In both cases, deposition scans were obtained immediately postinhalation and at 1 h 30 min, 4 h, and 22 h postinhalation. Regional deposition was characterized by the central-to-peripheral ratio and by the skew of the distribution of deposited particles on scans acquired directly postinhalation. Relative distribution of deposition between the airways and the alveolar region was derived from data acquired at the various time points. Compared with inhalation in 1G, subjects show an increase in central-to-peripheral ratio ( P = 0.043), skew ( P = 0.043), and tracheobronchial deposition ( P < 0.001) when particles were inhaled in μG. The absence of gravity caused fewer particles to deposit in the lung periphery than in the central region where deposition occurred mainly in the airways in μG. Furthermore, the increased skew observed in μG likely illustrates the presence of localized areas of deposition, i.e., “hot spots”, resulting from inertial impaction. In conclusion, gravity has a significant effect on deposition patterns of coarse particles, with most of deposition occurring in the alveolar region in 1G but in the large airways in μG.
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Isdarmanto, Isdarmanto, and Oentoeng Soebyanto. "ANALISIS POTENSI PANTAI GLAGAH SEBAGAI EKOWISATA UNGGULAN DI KABUPATEN KULONPROGO." Kepariwisataan: Jurnal Ilmiah 12, no. 02 (May 31, 2018): 1–12. http://dx.doi.org/10.47256/kepariwisataan.v12i02.82.
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Glagah Beach is one of the most potential beaches and has the uniqueness as the charm and excellence of other southern seas. Glagah Beach located in Kulon Progo Regency is the only beach in Java that has a breakwater and has a lagoon on the edge of the sea separated by the sea so that large waves do not reach the lagoon. According to the typology of Glagah beach it self can be included in the classification of marine deposition coast. This is because the beach is formed due to the deposition deposition of river sedimentation material to the sea. This condition can be indicated by the emergence of a barrier coast emerging due to sedimentation from the river that empties into the location, then subject to marine effects that result in the formation of the lagoon. The process of sedimentation that occurs due to the flow and sedimentation of the river mouth that causes sedimentation in the coastal area. Qualitative research methods used with data collection techniques in the form of observation, interviews, documents, and various sources of data so it can be more clearly known geographical aspects of Glagah Beach, tourism profile, tourist visit conditions, tourism potential Glagah Beach, and to know the constraints which faced Glagah Beach tourism object and how the development strategy of Glagah Beach tourist attraction area in the future. Glagah Beach is a natural attraction that has the privilege and excellence compared to other beaches in Yogyakarta that need to keep the sustainability and need to be managed more effectively by the community and the local government as a policy holder so Glagah Beach became one of the leading ecotourism object which is interesting in Kulon Progo Regency Yogyakarta.
Keywords: Glagah Beach; Sea Lagoon; Barrier Coast
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de Sousa, Lateiro Salvador, Raphael Muli Wambua, James Messo Raude, and Benedict Mwavu Mutua. "Assessment of Water Flow and Sedimentation Processes in Irrigation Schemes for Decision-Support Tool Development: A Case Review for the Chókwè Irrigation Scheme, Mozambique." AgriEngineering 1, no. 1 (March 6, 2019): 100–118. http://dx.doi.org/10.3390/agriengineering1010008.
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Water flow and sedimentation processes have been significantly erratic at the Chókwè Irrigation Scheme (CIS) and have affected its hydraulic performance. Given its expansion there is need to understand these processes taking place on-site and along the channels of the scheme. CIS being the biggest project of its kind in Mozambique requires proper management of water flow and sedimentation processes. Therefore, the effect of water flow, sediment transport and deposition parameters on the performance of the CIS is needed. In order to determine the effect of spatial and temporal water flow and sediment distribution trends along the irrigation canals, there is need to establish a correlation between these parameters. Determining the influence of water flow velocity on sediment settling rate at different depths along the canal reaches is important in managing the CIS. In addition, a developed decision-support tool to predict sediment deposition is required. For this reason, it is therefore crucial to carry out a timely assessment of water flow and sedimentation processes in CIS in a review concept. From the current review, some gaps that exist for more focused research on Chókwè Irrigation Scheme have been identified. In this regard therefore, there is need to develop an effective support tool for managing water flow and sediment deposition along the canal reaches with a view to increasing crop production in CIS.
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A. AL-Mafraji, Ekram, and Haider A. Al-Mussawy. "ENVIRONMENTAL AND HYDRAULIC MONITORING USING CATIONIC DYES TO INVESTIGATE THE BARRIERS EFFECT ON KAOLIN DEPOSITION." Journal of Engineering and Sustainable Development 25, no. 5 (September 1, 2021): 103–12. http://dx.doi.org/10.31272/jeasd.25.5.11.
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Dyes are used in hydraulic fields such as hydraulic tracking to show the flow path, monitor flow lines within a ground dam, or track the spread of contaminated water within horizontal pipes and environmental fields as environmental indicators in titrations, such as titration of precipitate composition. Some environmental experiments dispense with the dye's use because it interferes with other compounds, such as interfering with the turbidity readings even if non-reactive dyes, but the present study transformed this problem into a positive phenomenon to benefits from the dye in both fields. The research methodology includes a laboratory analysis using different parameters such as discharge of suspension, the volume of dye, and the percentage of initial water depth at maximum water depth also theoretical analysis of the previous research methodology. The experimental results show that cationic dyes' absorption (methylene blue dye, MB and crystal violet, CV) is directly proportional to the percentage of kaolin deposition in the sedimentation tank areas. Finally, MB and CV dyes are used in both fields in one trial(such as tracking flow movement, monitoring the vortices formed using baffles, and inter between the amount of kaolin precipitated in each zone the sedimentation). However, MB is the best compare to CV.
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Ehrbar, Daniel, Lukas Schmocker, Michael Doering, Marco Cortesi, Gérald Bourban, Robert Boes, and David Vetsch. "Continuous Seasonal and Large-Scale Periglacial Reservoir Sedimentation." Sustainability 10, no. 9 (September 12, 2018): 3265. http://dx.doi.org/10.3390/su10093265.
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Sustainable reservoir use is globally threatened by sedimentation. It has been generally recognized that inadequate consideration of reservoir sedimentation has caused the worldwide decline of net storage. Numerical models are useful tools to simulate sedimentation processes and can be used to derive efficient counter-measures and sediment management strategies. They can be applied to both existing and potential future reservoirs to predict long-term sedimentation. In this study, an application of a simple, robust, and stable numerical 1D model to Gebidem reservoir in Switzerland accompanied by field measurements is presented. It focusses on seasonal and large-scale reservoir sedimentation processes that occur continuously throughout the whole deposition season, while episodic events like turbidity currents are not taken into account. The model simulates both the delta formation of coarse sediments and the lake-wide sedimentation from homopycnal flows. The model is used to assess the effects and significance of varying boundary conditions like inflow, suspended sediment concentration, particle size distribution (PSD), or reservoir operation. It will be demonstrated that future reservoir operation and PSD are as important as future runoff evolution. Based on these findings, implications on future reservoir operation, also considering climate change, are discussed. Finally, an outlook on pending research topics is given.
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Erawan, Muhammad Trial Fiar, Tri Prartono, and Ali Arman. "Characteristics of Sediments Deposition in Karimata Strait." ILMU KELAUTAN: Indonesian Journal of Marine Sciences 23, no. 2 (June 21, 2018): 93. http://dx.doi.org/10.14710/ik.ijms.23.2.93-98.
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Karimata strait connects South China Sea and Indonesia territorial seas where the strait current pattern is affected by west and east monsoon. This condition influences particles depositing sedimentation process in the strait. Lack information about sediment depositing rate at the straits dozens years ago makes this research is important to be conducted. This research was to estimate sediment depositing rate in the strait in two areas, near shore and off shore of Borneo. The research was conducted on June to September 2015 used coring sediment samples. Those samples were derived from Baruna Jaya VIII Ship Cruise on June 2015 that was collaborative research between Ministry of Marine and Fisheries Affairs of Indonesia and National Nuclear Center of Indonesia (BATAN).Samples were analyzed in the laboratory of Chemical and Ocean, Department of Environmental and Natural Resources, Center of Radiation and Isotope, National Nuclear Center of Indonesia (BATAN). Estimation of sediment depositing rate used natural isotope 210Pb. The study shows that the depositing rate of the nearest to Borneo area is about 0.92 kg.m-2.y-1 (1965) and increases to be 3.31 kg.m-2.y-1 (2009). The other area is about 0.08 kg.m-2.y-1 (1840) and increases to be 1.78 kg.m-2.y-1 (2010). This result implies that the sediment depositing rate at the nearest area to Borneo is higher than the off shore. Keywords: Near shore, off shore, Natural Isotop 210Pb, CRS (Constant Rate of Supply) model
Dissertations / Theses on the topic "Sedimentation and deposition – Research – Namibia"
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Swart, Roger. "The sedimentology of the Zerrissene turbidite system, Damara Orogen, Namibia." Thesis, Rhodes University, 1991. http://hdl.handle.net/10962/d1005613.
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The Zerrissene turbidite system of central-western Namibia is a late Proterozoic sequence which consists of dominantly siliciclastic turbidites interbedded with minor turbiditic and hemipelagic marbles. The basin in which these sediments were deposited is located at the junction of the coastal and intra-cratonic arms of the Pan-African Damara Orogen, and an understanding of the sedimentary evolution of this basin is therefore important to the understanding of the development of the orogen as a whole. One major and two minor phases of folding have deformed the sediments, but the grade of metamorphism is low and sedimentary structures are often well preserved. Further, the area lies entirely within the Namib Desert and the lack of vegetation cover results in good outcrops providing an unusual opportunity for examining a large Precambrian turbidite system. The system consists of five formations: three siliciclastic and two mixed carbonatesiliciclastic units. The floor of the system is not exposed, and the oldest sedimentary rocks which outcrop are siliciclastics of the Zebrapiits Formation. This is overlain successively by the Brandberg West Formation (dominantly calcareous), the Brak River Formation (siliciclastic), the Gemsbok River Formation (calcareous) and the Amis River Formation (siliciclastic). Nine silicilastic turbidite facies have been recognised in the basin. These are facies A₂ (disorganised onglomerates), B₁ (horizontally laminated to massive greyackes), C₂ ("classical" turbidites), Dl (sandstone-shale couplets with base cut-out Bouma sequences), D₂ (sandstone-shale couplets with less sand than shale and base cut-out Bouma sequences), E (coarse, discontinuous sandstone-shale couplets), F (slumped units), G (shale) and H (glacial dropstones). Four facies are associated with the carbonate horizons, and these carbonate facies are given the suffix c to distinguish them from similar siliciclastic facies. These are facies Ac (disorganised and graded marble breccias), facies Cc (graded carbonates), facies Gc (hemi-pelagic marbles) and facies G (pelagic shales). The basal Zebrapiits Formation is made up of relatively thin packages of thin- to thickbedded, laterally continuous facies D₁, D₂ and B₁ beds encased in thick envelopes of shale. This type of sequence is typical of a distal lobe-fringe, and requires an unconfined basin-floor on which it can develop. The overlying Brandberg West Formation consists of a basal portion of interbedded facies Cc and G, followed by a sequence dominanted by facies Gc. This sequence is interpreted as representing outer-apron carbonate turbidites, derived from multiple point sources (facies Cc), with background pelagic settling (facies G) overlain by hemi-pelagic deposits (facies Gc). A reversal back to siliciclastic turbidites followed with deposition of the Brak River Formation. This sequence comprises relatively thick packages of laterally continuous facies B₁, D₁, and D₂ beds sandwiched between facies G shales, a succession characteristic of a lobe to lobe-fringe environment with intermittent abandonment of lobes. An unconfined basin floor adjacent to a passive margin is required for the development of this type of sequence. Glacial dropstones (facies H) are found in the upper portions of this formation, and slumped beds are also present (facies F), but are uncommon. The facies F beds are only found in association with facies H and are therefore considered to be genetically related. Slumping of beds was possibly caused by an oversupply of sediment from ice-rafting which caused instability. The overlying Gemsbok River Formation has a sequence similar to the Brandberg West Formation in that the basal portion consists of interbedded facies Cc and G, which is overlain by a thick sequence of largely facies Gc beds. Minor facies Ac beds occur near the top of the overall sequence. This formation is interpreted as an outer-apron succession with the facies Ac beds representing distal inner-apron deposits, indicating progradation of the system. The youngest unit in the basin, the Amis River Formation, shows strong lateral variation from west to east. In the west the sequence comprises laterally continuous facies B₁, C₂, D₁ and D₂ with rare, discontinuous facies E beds. Facies G is relatively minor in the sequence. In the east the succession is dominated by facies D₁, D₂ and G, and this succession is interpreted as a sequence of distal turbidites which were deposited on a basin-plain. The system developed by aggradation rather than progradation as only minor cycles are developed. Geochemical and petrological features indicate that the entire siliciclastic system was derived from a granite-recycled orogen terrane. Palaeocurrent data are unreliable because of the deformation, but transport was initially from the south-west, moving later to the west and north-west. The provenance of the carbonates is uncertain as reliable palaeocurrent indicators are rare, but they could have been derived either from South America or from the extensive carbonate deposits developed on the north-western margins of the basin. The Zenissene siliciclastic turbidite system represents the distal portion of a major submarine turbidite system, the more proximal parts of which now lie west of the exposed basin, either under the Atlantic Ocean or in eastern South America. The calcareous deposits developed as an apron adjacent to a multiple point source, the position of which is at present unknown.
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Wizevich, Michael Charles. "Sedimentology and Regional Implications of Fluvial Quartzose Sandstones of the Lee Formation, Central Appalachian Basin." Diss., This resource online, 1991. http://scholar.lib.vt.edu/theses/available/etd-06062008-155406/.
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Bartley, Rebecca. "Quantifying the geomorphic recovery of disturbed streams : using migrating sediment slugs as a model." Monash University, Dept. of Civil Engineering, 2001. http://arrow.monash.edu.au/hdl/1959.1/8395.
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Landers, Mark Newton. "Fluvial suspended sediment characteristics by high-resolution, surrogate metrics of turbidity, laser-diffraction, acoustic backscatter, and acoustic attenuation." Diss., Georgia Institute of Technology, 2011. http://hdl.handle.net/1853/43747.
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Sedimentation (erosion, transport, and deposition) is a primary and growing environmental, engineering, and agricultural issue around the world. However, collection of the data needed to develop solutions to sedimentation issues has declined by about three-fourths since 1983. Suspended-sediment surrogates have the potential to obtain sediment data using methods that are more accurate, of higher spatial and temporal resolution, and with less manually intensive, costly, and hazardous methods. The improved quality of sediment data from high-resolution surrogates may inform improved understanding and solutions to environmental, engineering, and agricultural sedimentation problems.
The field experiments for this research includ physical samples of suspended sediment collected concurrently with surrogate metrics from instruments including 1.2, 1.5, and 3.0 megahertz frequency acoustic doppler current profilers, a nephelometric turbidity sensor, and a laser-diffraction particle size analyzer. This comprehensive data set was collected over five storms in 2009 and 2010 at Yellow River near Atlanta, Georgia.
This research project has proposed, developed, and tested a new method for evaluation of sediment size from theoretical acoustic attenuation; evaluated and further developed recently introduced empirical methods for estimating acoustic attenuation by sediment; found and quantified data mischaracterization issues for laser-diffraction metrics; defined deterministic causes for observed hysteresis and variance in suspended sediment to surrogate relations; compared the accuracy of sediment concentration models and loads for each tested surrogate; and compared sediment surrogate technologies on the basis of reliability and operational considerations.
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Bobbins, Kerry Leigh. "Developing a form-process framework to describe the functioning of semi-arid alluvial fans in the Baviaanskloof Valley, South Africa." Thesis, Rhodes University, 2012. http://hdl.handle.net/10962/d1005500.
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The Baviaanskloof catchment is a semi-arid catchment located in the Cape Fold Mountains of South Africa. Little is known about the functioning of the complicated Baviaanskloof fluvial system and the role alluvial fans in the fluvial landscape. This thesis will contribute to field of geomorphology and, more specifically, to the field of fan morphometry by producing a standalone fan framework outlining methods to investigate the influence of external and internal control variables on alluvial fans. In this thesis, outcomes of the applied framework and case study are used to develop fan restoration guidelines for the Baviaanskloof Valley. The framework incorporates external and internal fan control variables at a valley-wide and local fan scale. External control variables include accommodation space, base-level change, and drainage basin inputs. Internal control variables include fan style, morphometry and fan channels. In order to apply the framework, fan morphometry data was required. This data was collected by creating a spatial plan of fans and basins in the valley. Outcomes of the applied framework include; an understanding of baselevel change on fans, relationships between fan basin characteristics and the fan surface and insight into fan channel processes. Results of the applied framework are investigated further using bivariate (correlation matrix) and multivariate (principle component analysis and regression analysis) analysis techniques. Significant relationships identified are: drainage basin area versus fan area, fan area and fan slope and drainage basin ruggedness and basin size. The primary outcomes of this thesis include an alluvial fan form-process framework, key considerations to be included in alluvial fan restoration projects and fan restoration guidelines. Contributions of this thesis to broader alluvial fan morphology science includes new insights into general fan literature by compiling a form-process alluvial fan classification framework to identify external and internal fan control variables and identify fan form. Additions have been made to Clarke’s (2010) evolutionary stages to describe stages 4 and 5 of fan evolution that has been adapted to describe fan evolution and differentiate between stages of mature fan evolution. This thesis has also contributed to the study of alluvial fans in South Africa, particularly in the Baviaanskloof Valley. The layout of the procedural guidelines and key considerations for an alluvial fan project provides a guide for rapid fan assessment for maximum cost and time benefits for stakeholders.
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Anderson, Christopher John. "The influence of hydrology and time on productivity and soil development of created and restored wetlands." Columbus, Ohio : Ohio State University, 2005. http://rave.ohiolink.edu/etdc/view?acc%5Fnum=osu1132540084.
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Kukla, Peter Alfred. "Tectonics and sedimentation of a late proterozoic Damaran convergent continental margin, Khomas Hochland, central Namibia." Thesis, 1990. https://hdl.handle.net/10539/26381.
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A Dissertation submitted to the Faculty of science,
University of the Witwatersrand, Johannesburg,
for the Degree of Doctor of PhilosophyThe Late Proterozoic Damara Oroqen (750-450 Ma} in Namibia forms part of the Pan-African mobile belt system which dissects southern Africa. The Khomas Trough in the inland branch of the orogen comprises thick multiply deformed metagraywackes and pelites of the Kuisab Formation. (Abbreviation abstract).
Andrew Chakane 2019
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Berti, Michael. "The evolution of marginal-marine systems of the Amibberg formation, Karasburg Basin, Southern Namibia: implications for Early-Middle Permian palaeogeography in South Western Gondwana." Thesis, 2015. http://hdl.handle.net/10539/17657.
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A dissertation submitted to the Faculty of Science, University of the Witwatersrand, Johannesburg, in fulfilment of requirements for the degree of Master of Science. Johannesburg, 2014.The Karasburg Basin is situated in southern Namibia and preserves a heterogeneous succession of Karoo Supergroup strata up to 1000m thick. The uppermost preserved succession in this basin is the Amibberg Formation which is 250m thick and consists of intervals of sandstone, siltstone and mudstone. This study uses facies analysis, sequence stratigraphy and petrography to determine the palaeogeography and provenance for the Amibberg Formation. This is then used to establish environmental variability across the Karasburg – Aranos – Main Karoo basins and to define an equivalent of the Amibberg Formation in the Main Karoo Basin. Detailed stratigraphic logging of five outcrop localities has led to the identification of seven distinct lithofacies and two dominant ichnofacies (Cruziana and Skolithos). These lithofacies include: 1) Massive, laminated and bioturbated mudstones interpreted as offshore deposits (OS); 2) Bioturbated siltstones and sandstones which are representative of offshore-transitional environments (OST); 3) Interbedded sandstones and siltstones also interpreted as offshore-transitional deposits (OST) and generated by river-fed hyperpycnal plumes; 4) Sharp based, massive sandstones interpreted as being deposited on the distal lower shoreface (dLSF); 5) Non-amalgamated hummocky cross-stratified (HCS) and wave rippled sandstones interpreted as distal lower shoreface deposits (dLSF); 6) Amalgamated HCS and wave rippled sandstones interpreted as proximal lower shoreface deposits (pLSF); and 7) Soft-sediment deformed (SSD) sandstones and siltstones occurring in close juxtaposition with dLSF and pLSF deposits. The vertical arrangement of these lithofacies shows a general coarsening and shallowing upward trend. Overall the rocks of the Amibberg Formation consist of wave-dominated shoreface deposits with significant influence by tidal processes. Petrographically, the sandstone samples fall into the class of quartz and feldspathic wackes and are sourced from craton interior provenances. Geochemical analysis of mudstones and nodules indicate high levels of microbial activity under predominantly oxic conditions during the deposition of the Amibberg Formation. Five poorly defined 4th order T-R cycles are observable within the strata of the Amibberg Formation. Large regressive intervals are capped by thin transgressive tracts and these cycles are interpreted to have formed due to eustatic processes. Overall, the Amibberg Formation represents a regressive shoreline. iii Based on the mean palaeocurrent vectors a NNE-SSW palaeoshoreline orientation is deduced and the shoreface must have occupied a palaeohigh on the northern side of the western Cargonian Highlands. This emergent highland acted as an extensive headland and assisted in the connectivity of the Karasburg and Aranos basins, with partial connectivity with the Main Karoo Basin during the Early Permian. Based on this study, the Amibberg Formation is considered an equivalent of the Waterford Formation in the Main Karoo Basin based on similar: stratigraphic position; thickness; sedimentary structures; trace fossil assemblages and stacking patterns.
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Price, Franklin D. Deyle Robert E. "Quantification, analysis, and management of intracoastal waterway channel margin erosion in the Guana Tolomato Matanzas National Estuarine Research Reserve, Florida." Diss., 2005. http://etd.lib.fsu.edu/theses/available/etd-04082005-090641.
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Thesis (M.S.)--Florida State University, 2005.Advisor: Dr. Robert Deyle, Florida State University, College of Social Sciences, Dept. of Urban and Regional Planning. Title and description from dissertation home page (viewed June 13, 2005). Document formatted into pages; contains ix, 70 pages. Includes bibliographical references.
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Cadle, Anthony Burnard. "Deposiotional systems of the permian Vryheid formation highveld coalfield, South Africa: their relationship to coal seam occurence and distribution." Thesis, 1995. http://hdl.handle.net/10539/22025.
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The Permo-Carboniferous Dwyka Group and Vryheid Formation of the Karoo. Sequence in the Highveld Coalfield are analysed to determine the depositional systems operative during sedimentation. The investigation involves the processing of "629"
borehole cores and logs in an area of 860km2.[Abbreviated Abstract. Open document to view full version]AC2017
Books on the topic "Sedimentation and deposition – Research – Namibia"
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Otvos, Ervin G. Subsurface evaluation of Mississippi coastal sediment units: Comparison with Apalachicola area Quaternary sequence. University, Miss: Mississippi Mineral Resources Institute, 1990.
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Branney, M. J. Pyroclastic density currents and the sedimentation of ignimbrites. London: Geological Society, 2002.
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Stauble, Donald K. Long-term profile and sediment morphodynamics: Field Research Facility case history. [Vicksburg, Miss: U.S. Army Engineer Waterways Experiment Station, 1992.
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Stauble, Donald K. Long-term profile and sediment morphodynamics: Field Research Facility case history. [Vicksburg, Miss: U.S. Army Engineer Waterways Experiment Station, 1992.
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Sedimentologists, International Association of, ed. Sediments, morphology, and sedimentary processes on continental shelves: Advances in technologies, research, and applications. Oxford: Wiley-Blackwell, 2012.
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Jean, Burrus, Institut français du pétrole, and Centre national de la recherche scientifique (France), eds. Thermal modeling in sedimentary basins: 1st IFP Exploration Research Conference, Carcans, France, June 3-7, 1985. Paris: Editions Technip, 1986.
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(2004), Expedition LENA. The Expedition LENA 2004 in Siberia and the Expedition LIVINGSTON 2005 in Antartica. Bremerhaven: Alfred-Wegener-Institut für Polar- und Meeresforschung ; Bremen, 2006.
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2002, Expedition LENA. Russian-German cooperation System Laptev Sea: The Expedition LENA 2002. Bremerhaven: Alfred-Wegener-Institut für Polar- und Meeresforschung, 2003.
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2006, Expedition LENA. Russian-German cooperation System Laptev Sea: The Expedition LENA 2006. Bremerhaven: Alfred-Wegener-Institut für Polar- und Meeresforschung, 2007.
Find full textBook chapters on the topic "Sedimentation and deposition – Research – Namibia"
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Sedrique, Zoyem Tedonfack, and Julius Tata Nfor. "Rainfall Variability and Quantity of Water Supply in Bamenda I, Northwest Region of Cameroon." In African Handbook of Climate Change Adaptation, 713–33. Cham: Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-45106-6_139.
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AbstractBamenda I municipality found in the humid tropic is endowed with a dense hydrological network which makes it a water catchment for the entire region. Paradoxically, the region still suffers problems of water shortage. This is due to the spatial and temporal variability in rainfall that greatly affects water supply through its impacts on surface and groundwater. For this reason, we came up with the research topic “Rainfall variability and quantity of water supply in Bamenda 1, Northwest Region of Cameroon.” The objective of this study is to examine the manifestations of rainfall variability, and how it affects quantity of water supply in the humid tropics. Rainfall data use for this study comprised of annual, monthly, and daily rainfall over a period of 55 years. Water supply data was made of monthly and annual supply. With these data, a Pearson’s correlation was computed, and it gave a value of 0.701, with a rainfall proportion of 49.14% and 50.86% for other factors. The seasonality and the Standardized Precipitation Index were equally analyzed. At the end of the study, results showed that rainfall events in Bamenda I fluctuates with time and in space. It equally presented a reduction in the number of rainy days from 204 days in 1663 to 155 in 2018. This led to a reduction in length of rainy season and in rainfall amounts. In addition, the area has witnessed sedimentation of riverbeds and water reservoirs due to erosion and deposition during high rainfall peaks. Equally, floods observed during high rainfall episodes have become a potential threat to water infrastructures imposing exceptional water shortages during the rainy seasons. Due to these, actors in the water supply sector are putting in measures to remedy the situation.
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"Fish Habitat: Essential Fish Habitat and Rehabilitation." In Fish Habitat: Essential Fish Habitat and Rehabilitation, edited by Nina M. Kelly, Don Field, Ford A. Cross, and Robert Emmett. American Fisheries Society, 1999. http://dx.doi.org/10.47886/9781888569124.ch19.
Full textAbstract:
<em>Abstract.</em> —The rivers and streams that drain into the lower Columbia River estuary in Oregon contain essential fish habitat (EFH) for several species of Pacific salmon. Seven subwatershed basins in the Columbia River drainage basin, each containing salmon spawning and nursery habitat, were examined using remote sensing and geographic information system techniques to measure the amount and pattern of upland forest clearing. Landsat Thematic Mapper imagery from 1989 and 1992 was used to determine the cleared forest patches produced by clear-cutting. Digital Elevation Models were used to determine slope underlying cleared patches. A digital coverage (or map layer) of streams containing EFH was used to measure proximity of cleared patches to streams. The size and slope of cleared forest patches and the proximity of cleared forest patches to streams can greatly exacerbate the deposition of sediment in streams, altering stream environments and the quality of EFH. Size, slope, and proximity of cleared forest patches to streams containing EFH were calculated for the seven subwatershed basins. This analysis was performed at a landscape scale and utilized readily available broadscale data to (1) compare forest-clearing patterns across basins and (2) locate critical areas for further analysis using finer-scale data. Once critical areas had been located, a second analysis was performed using finer-scale data. The landscape-scale results indicated major differences in the spatial pattern of forest-clearing change across the lower Columbia River estuary drainage basin, with some subwatershed basins significantly altered in the three-year period. Three subwatershed basins showed a pattern of large cleared patches close to streams containing EFH. Some of these cleared forest patches were situated at least partially on steep slopes. In the three basins, Milton Creek, Young’s River, and the Claskanie River run directly through large areas of cleared forest. The pattern evidenced in these critical areas is consistent with increased sedimentation and decreased stream shading characteristics, both of which can have a detrimental effect on fish habitat. Milton Creek was examined with finer-scale data, and these results showed an increased number of cleared forest patches and increased total area of cleared forest draining into streams. More cleared forest patches on steep slopes were also shown with the finer-scale data. These results provide an initial justification for performing searches for critical areas at a synoptic or landscape scale, with further research performed at a finer scale. These techniques provide a practical method to evaluate upland land-use activities and essential fish habitat.
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"Fish Habitat: Essential Fish Habitat and Rehabilitation." In Fish Habitat: Essential Fish Habitat and Rehabilitation, edited by Nina M. Kelly, Don Field, Ford A. Cross, and Robert Emmett. American Fisheries Society, 1999. http://dx.doi.org/10.47886/9781888569124.ch19.
Full textAbstract:
<em>Abstract.</em> —The rivers and streams that drain into the lower Columbia River estuary in Oregon contain essential fish habitat (EFH) for several species of Pacific salmon. Seven subwatershed basins in the Columbia River drainage basin, each containing salmon spawning and nursery habitat, were examined using remote sensing and geographic information system techniques to measure the amount and pattern of upland forest clearing. Landsat Thematic Mapper imagery from 1989 and 1992 was used to determine the cleared forest patches produced by clear-cutting. Digital Elevation Models were used to determine slope underlying cleared patches. A digital coverage (or map layer) of streams containing EFH was used to measure proximity of cleared patches to streams. The size and slope of cleared forest patches and the proximity of cleared forest patches to streams can greatly exacerbate the deposition of sediment in streams, altering stream environments and the quality of EFH. Size, slope, and proximity of cleared forest patches to streams containing EFH were calculated for the seven subwatershed basins. This analysis was performed at a landscape scale and utilized readily available broadscale data to (1) compare forest-clearing patterns across basins and (2) locate critical areas for further analysis using finer-scale data. Once critical areas had been located, a second analysis was performed using finer-scale data. The landscape-scale results indicated major differences in the spatial pattern of forest-clearing change across the lower Columbia River estuary drainage basin, with some subwatershed basins significantly altered in the three-year period. Three subwatershed basins showed a pattern of large cleared patches close to streams containing EFH. Some of these cleared forest patches were situated at least partially on steep slopes. In the three basins, Milton Creek, Young’s River, and the Claskanie River run directly through large areas of cleared forest. The pattern evidenced in these critical areas is consistent with increased sedimentation and decreased stream shading characteristics, both of which can have a detrimental effect on fish habitat. Milton Creek was examined with finer-scale data, and these results showed an increased number of cleared forest patches and increased total area of cleared forest draining into streams. More cleared forest patches on steep slopes were also shown with the finer-scale data. These results provide an initial justification for performing searches for critical areas at a synoptic or landscape scale, with further research performed at a finer scale. These techniques provide a practical method to evaluate upland land-use activities and essential fish habitat.
Conference papers on the topic "Sedimentation and deposition – Research – Namibia"
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Rahman, Mosfequr, Andrew Hudson, Gustavo Molina, and Valentin Soloiu. "Numerical Analysis of Laminar Natural Convection in Rectangular Enclosures of Different Aspect Ratios With and Without Aerosol Nanofluid." In ASME 2013 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2013. http://dx.doi.org/10.1115/imece2013-65056.
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Natural convection heat transfer in rectangular enclosures is important in many real-world engineering applications. Included in these applications are the energy efficient design of buildings, operation and safety of nuclear reactors, solar collector design, passive energy storage, heat transfer across multi-pane windows, thermo-electric refrigeration and heating devices, and the design-for-mitigation of optical distortion in large-scale laser systems, environmental engineering and electronic packaging. A common industrial application of natural convection is free air cooling without the aid of fans and can happen on small scales such as computer chips to large scale process equipment. In addition to temperature gradient convection strength within the enclosure can vary due to the existence of nanoparticles with the base fluid. The field of nanofluid research has been expanding in recent years. Most of the research performed for the purpose of heat transfer using nanofluids has been conducted on liquid based nanofluids, leaving the aerosol-based nanofluid research lagging. There is also a deficit in the research previously performed to develop a computer model of heat transfer enhancement using nanofluid. The transport of solid particles and liquid droplets in a fluid has long been a subject of great interest. Understanding, measuring, and quantifying the deposition of aerosol on walls is important in various sectors of science and technology. Some examples are the deposition of drugs and harmful substances in the nasal and respiratory tracts in medical science and engineering; deposition of particles and droplets in gas and steam turbines in power plant engineering; the atmospheric dispersal of pollutants and the determination of indoor air quality in environmental science; the transport and sedimentation of various substances in rivers in civil engineering; fouling of process and heat transfer equipments in process industries; and the transport of chemical aerosols in chemical process engineering. In this research work the case of pure air was first solved for 6 different aspect ratios, then the nanofluid was introduced and the resulting heat transfer was observed. The aerosol nanofluid used was composed of air with copper nanoparticles suspended in an enclosure. This procedure was repeated for multiple aspect ratios. This research also develops a functional computer model for heat transfer enhancement using nanofluid.
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Zhanyang, Liu, Shang-Guan Zhihong, Zhao Feng, and Zhang Qiming. "Radiation Evaluation System for Radiation Releasing Environment of Nuclear Power Plant Based on Domain-Driven Design." In 2017 25th International Conference on Nuclear Engineering. American Society of Mechanical Engineers, 2017. http://dx.doi.org/10.1115/icone25-67358.
Full textAbstract:
In order to meet the sustainable development demand for energy, developing nuclear power actively has become an important means for the country to improve energy supply pattern and change the energy structure. The normal operation of the nuclear power station brings enormous economic and social benefits, but also accompanied by airborne radioactive effluent and liquid radioactive effluent discharge. In order to estimate the effect of radioactive effluent release during the normal operation of nuclear power plant on radiation dose of the environment and the public, in this article, domain knowledge analysis and domain knowledge modeling will be carried out on the theoretical model of evaluation calculation. Then, combined with actual business logic, advanced software development techniques and mature design ideas will be adopted to realize the field component of radiation dose evaluation in nuclear power plant. Establish the corresponding domain component library, and thus to achieve the building of radiation dose evaluation software system. The main content of this paper will be divided into two parts to elaborate, First part is the domain knowledge analysis and modeling of radiation dose evaluation model of nuclear power plant radiation environment, the other part is based on radiation dose evaluation component library software system researching, designing and achieving. In the domain knowledge analysis of the radiation dose estimation model, due to the mutual independence of the airborne radioactive effluent and the liquid radioactive effluent in the evaluation mode, this paper will analyze and model the domain knowledge separately. The airborne radioactive effluent is divided into four parts: air immersion external exposure, ground deposition external irradiation, ingestion inhalation and inhalation in air. The main contents of the analysis include atmospheric diffusion suitable for environmental characteristics of nuclear power plant site, ground deposition factors, food chain data, and lifestyle habits around the site. In the field of knowledge analysis of liquid radioactive effluent, there are four ways: external marine activity irradiation, coastal deposit sediment irradiation, and irradiation of seafood. The analysis mainly includes dilution and diffusion conditions in the surrounding sea area of nuclear power plant, the radionuclide in the seawater of the receiving water body, the shore sedimentation factor and the transfer model of the radionuclide in the seafood. Based on the detailed analysis and research on the radiation dose evaluation of nuclear power plant, and the designing of the domain model by adopting mature software design idea and the advanced software development technology, the domain component of the radiation dose evaluation field is realized, and build the corresponding domain component library. This can provide a reliable and usable domain component library for the radiation dose evaluation of each nuclear power plant, improve the maintainability of the radiation dose evaluation system of the nuclear power plant, the comprehensibility of business logic, and the reusability of the evaluate module, so as to meet the calculation demands on radiation dose effects of public caused by radionuclide release in normal operation of the nuclear power plant.