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Registros recuperados: 7
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Biogenic Assemblage and Hydrodynamic Settings of the Tidally Dominated Reef Platform Sediments of the Zanzibar Channel OceanDocs
Shaghude, Y.W.; Wannas, K.O.; Mahongo, S.B..
The biogenic assemblage and hydrodynamic settings of the tidally dominated reef platform sediments (TDRPS) east of the Zanzibar channel were investigated in order to characterise the carbonate sediments. Benthic foraminifera were found to be the most important group both in terms of average abundance (> 60 % by weight) and also in terms of spatial distribution with ommon occurrence in all sediments samples. Pelecypods with an average abundance of 8 % were slightly less widely distributed. The remaining groups occurred at lower average abundance and less frequently in the sediments. Current measurements indicated that the maximum current speed is higher during spring than during neap tides. The direction is phase-dependent with flood tidal current...
Tipo: Journal Contribution Palavras-chave: Biogenic deposits Hydrodynamics Carbonate sediments Reef formation Floods Ebb currents ISW; Tanzania.
Ano: 2002 URL: http://hdl.handle.net/1834/32
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Coastal Impacts of Water Abstraction and Impoundment in Africa: the Case of Rufiji River OceanDocs
Shaghude, Y.W..
Construction of large dams with reservoir type storage impound water behind them for seasonal annual, and in some cases for multi-annual storage and regulation of a river. Similarly, tubewells abstract surface and ground water bodies from their natural flow. The impoundment of water by damming and its abstraction through tubewells are common practices in the world and even within the Africa region (WCD, 2000). Globally, the number of large dams has grown at a tremendous pace during the last 50 years (Fig. 1.1) The fast growth in dam construction is driven by an increasing demand of water from urban and rural communities for reliable freshwater supply, agricultural irrigation and hydro-electric power. As these practices become more widespread, they are...
Tipo: Preprint Palavras-chave: Coastal structures; Erosion features; Coastal zone management.
Ano: 2005 URL: http://hdl.handle.net/1834/187
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Preliminary investigation on the Pleistocene/Holocene Sea-Level Changes along the Coastline of Tanzania, with reference to Unguja and Pemba Islands OceanDocs
Nyandwi, N.; Muzuka, A.N.N.; Shaghude, Y.W..
Along the coast of Tanzania, coral reefs, marine terraces and beach ridges are among the most important geomorphological features indicative of the Pleistocene/Holocene sea level changes. Three major terrace units can easily be identified on the mainland coast, namely, Mtoni (youngest), Tanga and Sakura (oldest). Three terrace units have also been identified on the Islands of Unguja and Pemba. On the basis of the difference in the terrace elevations between the two terrace systems it is postulated that the marine terraces on the islands probably represent minor fluctuations of sea level, rather than major phases of sea level fluctuation. A sand beach on the seaward side and several sand ridges on the landward side represent the Recent phase. The oldest...
Tipo: Report Palavras-chave: Geology; Pleistocene; Holocene.
Ano: 2003 URL: http://hdl.handle.net/1834/818
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Remote Sensing for Studying Nearshore Bottom Morphology and Shoreline Changes OceanDocs
Shaghude, Y.W..
The major objective of the present study is to demonstrate how remote sensing approach can be used for studying nearshore bottom morphology and shoreline changes in coastal Tanzania. Two study sites were used. In the first site, remote sensing satellite Landsat Thematic Mapper data was evaluated against known water depths from conventional echo sounding measurement taken on the eastern side of the channel. The correlation between the remote sensing data and the echo sounding mesurement was rather satisfactory, suggesting that the approach can roughly be used to investigate sea bottom morphology in the nearshore areas. In the second study site, remote sensing satellite data from Landsat Thematic Mapper and Enhanced Thematic Mapper were used to investigate...
Tipo: Journal Contribution Palavras-chave: Remote sensing; Sediments; Coastal erosion; Shorelines.
Ano: 2004 URL: http://hdl.handle.net/1834/195
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Sediment Distribution and Composition on the Shallow Water Carbonate Basin of the Zanzibar Channel OceanDocs
Shaghude, Y.W..
The sediments of the shallow water carbonate basin of the Zanzibar channel were investigated to describe their general characteristics in terms of composition and grain size distribution. The surface sediment composition was dominated by carbonate sands (with CaCO3 > 30%), except in the area adjacent to the mainland coastline and a thin lobe which projects from Ruvu River to the middle of the channel. The mean grain size distribution closely resembled that of the carbonate content, where the Tidally Dominated Reef Platform Sediments (TDRPS) located east of the Zanzibar channel were characterised by medium to coarse sands and the siliciclastic sediments adjacent to the mainland are characterised by fine sand. The TDRPS were the most poorly sorted...
Tipo: Journal Contribution Palavras-chave: Sediment dynamics; Sediment movement.
Ano: 2003 URL: http://hdl.handle.net/1834/179
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Shore Morphology and Sediment Characteristics South of Pangani River, Coastal Tanzania OceanDocs
Shaghude, Y.W..
The shore morphology and nearshore sediments between the Pangani and Kipumbwi rivers were investigated to describe the shore and the reef platform sediments characteristics and also to update information on recent shoreline changes along the Tanzania mainland coast. The information gathered during this study comes from field observations, sediment sampling of the area and interviews with Pangani residents. The investigated area is a patch reef coast with narrow or no beaches and fossil reef terrace islands offshore, Pangani bay and estuary are among the most prominent shore features. Historical information indicates that, both the bay, and the estuary have undergone significant changes during the last 60 years. While the growth of the estuary has mainly...
Tipo: Preprint Palavras-chave: Sedimentation; Coastal sediment; Sediments; Reefs; Shorelines; Sediment sampling.
Ano: 2004 URL: http://hdl.handle.net/1834/214
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The Study of Sediment Characteristics and Nearshore Sediment Dynamicsin Coastal Tanzania OceanDocs
Shaghude, Y.W..
The nearshore morphological features, its sediment dynamics and characteristics of the Tanzania Mainland coastal stretch between the rivers Pangani and Wami were investigated. The study is a continuation of other similar studies (e.g Shaghude 2001) which provides a detail account on the nearshore sediment dynamics and its characteristics, in the Tanzania mainland coastal stretch between the rivers Ruvu and Wami, south of the present investigated area. The study is inline with the guidelines on the studies of shoreline changes in the Eastern African region, as well the study of the Eastern African database of coastal resources. The former has recommended detailed studies of shore morphological features, with updating of old information, while the later has...
Tipo: Report Palavras-chave: Sediment dynamics.
Ano: 2004 URL: http://hdl.handle.net/1834/177
Registros recuperados: 7
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