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Laboratory study of suspended sediment dynamics over a mildly sloping sandy seabed

100%

Stachurska B., Staroszczyk R.

Oceanologia

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2019

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tom 61

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nr 3

2

Spectral structure of surface waves and its influence on sediment dynamics

100%

Divinsky B. V., Kosyan R. D.

Oceanologia

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2019

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tom 61

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nr 1

3

Temporal changes of sediment dynamics within the Nairobi River sub-basins between 1998-2006 time scale, Kenya

84%

Kithiia S. M., Wambua B. N.

Annals of Warsaw University of Life Sciences - SGGW. Land Reclamation

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2010

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tom 42

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nr 1

17-22

The city of Nairobi is the heart of both industrial production and the economic hub in Kenya and the Eastern Africa region. The city of Nairobi and its environs are drained by three streams, namely: Nairobi, Mathare and Ngong rivers. These streams drain areas of diverse land use activities. The land use changes in a spatial manner from the rich agricultural system through residential cum urban to industrial. The signifi cance of these various land use systems to pollutants generation, pollution, sediment generation and hence water pollution and quality degradation is quite enormous and worth investigation. The land use changes in a spatial manner making the basin ideal for a temporal variation of sediments yields along the river profi le and their impacts on the water quality status. This paper examines the results of study carried out within the basins in the years 1998–2006. The method of study involved water sampling and laboratory analysis to reveal the trends in sediment load increases downstream the investigated streams. Soil samples were also investigated to determine their relationship to soil erosion rates and sediment fl uxes. The study attempts further to fi nd the best sediment management strategies in reversing their increasing trends and restoring water quality within the basin.

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A deeper understanding of river habitat-scale ecohydraulics: interpreting the relationship between habitat type, depth and velocity using knowledge of sediment dynamics and macrophyte growth

67%

Kemp J. L., Harper D. M., Crosa G. A.

International Journal of Ecohydrology and Hydrobiology

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2002

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tom 02

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nr 1-4

Late spring/summer depth and velocity conditions of 16 ‘functional habitats’ were investigated in lowland rivers. The habitats significantly associated with shallower, faster areas were 'submerged, fine-leaved macrophytes' (20-40 cm deep, >0.45 ms-1) and 'macroalgae' (10-30 cm, >0.60 ms-1). 'Cobbles' were associated with slightly slower, shallower conditions (0-20 cm, 0.45 ms-1), 'gravels' with slower conditions again (around 0.15 ms-1, depths from 0-30 cm). The slowest velocity class (0-0.05 ms-1) was associated with 'silt' (depths 20-70 cm), ‘marginal plants' (0-20 cm deep), 'emergent macrophytes' (10-80 cm deep), 'submerged, broad-leaved macrophytes' (40-110 cm deep), 'floating leaved macrophytes' (40-150 cm deep) and a second mode of ‘macroalgae’ (145-180 cm deep). The factors thought to be behind these findings are discussed.

Ograniczanie wyników

2 Oceanologia

1 Annals of Warsaw University of Life Sciences - SGGW. Land Reclamation

1 International Journal of Ecohydrology and Hydrobiology

1 Crosa G. A.

1 Divinsky B. V.

1 Harper D. M.

1 Kemp J. L.

1 Kithiia S. M.

1 Kosyan R. D.

1 Stachurska B.

1 Staroszczyk R.

1 Wambua B. N.

2 2019

1 2010

1 2002

Laboratory study of suspended sediment dynamics over a mildly sloping sandy seabed

Spectral structure of surface waves and its influence on sediment dynamics

Temporal changes of sediment dynamics within the Nairobi River sub-basins between 1998-2006 time scale, Kenya

A deeper understanding of river habitat-scale ecohydraulics: interpreting the relationship between habitat type, depth and velocity using knowledge of sediment dynamics and macrophyte growth