Application of a Mathematical Model to Investigate Sedimentation at Eastham Dock, Mersey Estuary

  1. Ashish J. Mehta
  1. Antony P. Diserens,
  2. Mary C. Ockenden and
  3. E. Andrew Delo

Published Online: 15 MAR 2013

DOI: 10.1029/CE042p0486

Nearshore and Estuarine Cohesive Sediment Transport

Nearshore and Estuarine Cohesive Sediment Transport

How to Cite

Diserens, A. P., Ockenden, M. C. and Delo, E. A. (1993) Application of a Mathematical Model to Investigate Sedimentation at Eastham Dock, Mersey Estuary, in Nearshore and Estuarine Cohesive Sediment Transport (ed A. J. Mehta), American Geophysical Union, Washington, D. C.. doi: 10.1029/CE042p0486

Publication History

  1. Published Online: 15 MAR 2013
  2. Published Print: 1 JAN 1993

ISBN Information

Print ISBN: 9780875902562

Online ISBN: 9781118665015

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Keywords:

  • Estuarine sediments—Congresses;
  • Marine sediments—Congresses;
  • Sediment transport—Congresses

Summary

Field measurements of the deposition of cohesive sediment at a site at Eastham Dock in the Mersey estuary, UK are described. The field results were used to test the way the deposition process is modeled in a mathematical model of sedimentation at a point. A bed frame was deployed over three spring tides and two neap tides at the Eastham Dock site. Continuous measurements were made of velocities, suspended sediment concentrations, water pressure and bed level for approximately 3.5 hours either side of high water. Deposition was measured on both the spring tides and the neap tides. The results were used as input to a single point model of sedimentation (SAP). Deposition, consolidation and erosion were modeled. Sensitivity analysis of the model was undertaken to test the sensitivity of the critical shear stress for deposition and the settling velocity of the sediment, which are seen to be important parameters in the deposition process. The model prediction of depth of deposition over a spring tide and a neap tide was compared with the field measurements and with long term deposition measured in the adjacent channel. Transport of mud down the slope of the mudflat into the channel was observed in the field, a process which was not adequately represented in the point model.