Tidal dynamics and sediment transport in a shallow macrotidal estuary

1996 ◽  
pp. 338-360 ◽  
Author(s):  
G. Lessa
Keyword(s):  
Sediment Transport ◽  
Tidal Dynamics ◽  
Macrotidal Estuary

scholarly journals Tidal current power effects on nearby sandbanks: a case study in the Race of Alderney

2020 ◽  
Vol 378 (2178) ◽  
pp. 20190503 ◽  
Author(s):  
Luke S. Blunden ◽  
Stephen G. Haynes ◽  
AbuBakr S. Bahaj
Keyword(s):  
Sediment Transport ◽  
Tidal Energy ◽  
Sand Wave ◽  
Sand Transport ◽  
Tidal Dynamics ◽  
Tidal Flows ◽  
Tidal Turbine ◽  
Turbine Arrays ◽  
Sediment Model

A validated numerical model of tidal flows and sediment transport around the Alderney South Banks was used to investigate the potential effects of large (300 MW) tidal turbine arrays at different locations in Alderney territorial waters. Two methods were used, firstly looking at hydrodynamic changes only and secondly modelling sediment transport over a non-erodible bed. The baseline hydrodynamic model was validated relative to ADCP velocity data collected in the immediate vicinity of the sandbank. Real-world sand transport rates were inferred from sand-wave migrations and agree favourably with sediment transport residuals calculated from model outputs. Outputs from the sediment model reproduced realistic morphological behaviours over the bank. Seventeen different locations were considered; most did not result in significant hydrodynamic changes over the South Banks; however, three array locations were singled out as requiring extra caution if development were to occur. The results provide a case for optimizing the array locations for twin objectives of maximizing array power and minimizing impacts on the sandbanks. This article is part of the theme issue ‘New insights on tidal dynamics and tidal energy harvesting in the Alderney Race’.

Suspended Sediment Transport in a Rock-Bound, Macrotidal Estuary: Han Estuary, Eastern Yellow Sea

2013 ◽  
Vol 287 ◽  
pp. 358-371 ◽  
Author(s):  
Hee J. Lee ◽  
Jun Y. Park ◽  
Sang H. Lee ◽  
Jeong M. Lee ◽  
Tae K. Kim
Keyword(s):  
Sediment Transport ◽  
Suspended Sediment ◽  
Yellow Sea ◽  
Suspended Sediment Transport ◽  
Macrotidal Estuary

scholarly journals Seasonal Estuarine Turbidity Maximum under Strong Tidal Dynamics: Three-Year Observations in the Changjiang River Estuary

Water ◽  
2020 ◽  
Vol 12 (7) ◽  
pp. 1854
Author(s):  
Xia Hua ◽  
Huiming Huang ◽  
Yigang Wang ◽  
Xiao Yu ◽  
Kun Zhao ◽  
...  
Keyword(s):  
Sediment Transport ◽  
River Discharge ◽  
River Estuary ◽  
Changjiang River ◽  
Changjiang River Estuary ◽  
Wet Season ◽  
Tidal Dynamics ◽  
The Changjiang River ◽  
The Changjiang River Estuary ◽  
Dry Seasons

The estuarine turbidity maximum (ETM) under strong tidal dynamics (during spring tides) was investigated along the Deepwater Navigation Channel (DNC) in the North Passage (NP) of the Changjiang River Estuary (CRE) in wet and dry seasons of 2016, 2017 and 2018. The observed water current, salinity, stratification and suspended sediment concentration (SSC) were illustrated and analyzed. Results show that the SSC was lower in wet seasons than dry seasons in 2016 and 2017 because of the weak influence of typhoons before observations in wet seasons. On the contrary, the SSC was higher in the wet season than the dry season in 2018 because of the strong influence of typhoons in the wet season. Our observations challenged the common perspective that SSC in the NP is higher in wet seasons than dry seasons, because the magnitudes of SSC were found to be easily influenced by strong winds before observations. The along-channel distribution of high SSC was determined by the location of salt wedge, and consequently, the ETM was further upstream in dry seasons than wet seasons. The observed SSC was more concentrated in lower water layers in wet seasons (“exponential” profile) than dry seasons (“linear” profile). This seasonal difference of vertical SSC was related to the flocculation setting velocity influenced by temperature rather than the weak stratification during spring tides. Moreover, on the basis of the net water/sediment transport and flux splitting, large river discharge and a low-SSC condition could reduce siltation in the middle DNC. The former vanished the convergence of water transport, and the latter reduced landward tidal pumping sediment transport. Sediment trapping and siltation in the dry seasons occurred in the seaward segment of the upper reach because of the decrease in the river discharge.

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