Effect of neap-spring hydrodynamics on salt and suspended sediment transport in multi-branched urban estuaries

The Science of the Total Environment
Joan Cecilia CasilaKatsuhide Yokoyama

Abstract

Unique neap and spring tide hydrodynamic features were studied in the estuarine areas of multi-branched urban rivers in Tokyo, Japan. Intensive measurements of salinity, turbidity, dissolved oxygen, velocity, particulate organic matter (POM), and nutrients were conducted for 13h in five stations simultaneously on July 3 and July 11, 2017. Water sampling, analysis and calculations of salt and sediment transport were performed. Results showed that the Arakawa and Sumida Rivers follow the typical natural estuary hydrodynamics while Shakujii River followed a typical artificial urban estuary. Shakujii River upstream estuary had lower flow velocity during spring tide (-0.05 to 0.04m/s) than neap tide (-0.09 to 0.16m/s) because of the channel slope that does not allow the transit of water to upstream even during high tide. Shakujii River downstream estuary had hypoxic (DO<2mg/L) bottom depths during neap and spring tide. Sumida River and Shakujii River are adjacent yet the nutrient and POM had different nature. Shakujii River is highly influenced by freshwater from combined sewer systems carrying POM, nutrients and sediments. The freshwater was 54% (14,650m3) and 100% (28,671.1m3) by volume during neap and spring tide, respectively. T...Continue Reading

References

Dec 8, 2007·Journal of Environmental Sciences (China)·Hong-jun YangWen-hua Wang
Oct 17, 2012·PloS One·Nuno VazJoão Miguel Dias
Feb 25, 2018·Marine Pollution Bulletin·Andrew M TyeChristopher H Vane
Oct 5, 2018·The Science of the Total Environment·A BonomettoR Boscolo Brusà
Mar 8, 2019·The Science of the Total Environment·Gretchen P Oelsner, Edward G Stets

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