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Ocean Dynamics

, Volume 69, Issue 2, pp 239–252 | Cite as

Temporal and spatial changes in grain size on a macro-tidal channel-flat complex: results from Kingsport, Nova Scotia, Bay of Fundy

  • Brent A. LawEmail author
  • Paul S. Hill
  • Timmothy G. Milligan
  • Vanessa Zions
Article
Part of the following topical collections:
  1. Topical Collection on the 14th International Conference on Cohesive Sediment Transport in Montevideo, Uruguay 13-17 November 2017

Abstract

Understanding the processes that lead to seasonal changes in grain size on muddy macro-tidal flat and channel complexes will assist efforts to predict future changes caused by climate change and construction of infrastructure like tidal power generators, wind farms, and causeways. Surficial sediment samples were collected for disaggregated inorganic grain size (DIGS) analysis every month for 1 year from a tidal flat and from a tidal channel and its banks in Kingsport, NS, Canada, which is located in the Minas Basin of the Bay of Fundy. A process-based parameterization of the DIGS distribution was used to determine floc fraction, representative of the percentage of fine-grained material deposited to the seabed in flocs. Small changes in floc fraction occurred seasonally in the channel. Values were higher in late winter and lower in late summer. A more pronounced seasonal variation in floc fraction was observed on the tidal flats. Observed changes in floc fraction correlated with elevation. Results from this study are discussed in terms of the controls on floc fraction which include suspended particulate matter concentration (SPM), turbulence, and stickiness in the water column, all of which can be used to understand the formative processes responsible for shaping the bottom sediment texture.

Keywords

Grain size Macro-tidal Flocs Floc fraction Tidal flats 

Notes

Acknowledgements

We would like to thank Casey O’Laughlin, Emma Poirier, Danika vanProosdij, Gary Bugden, Logan Ashall, and Ryan Mulligan for their support in the field and great talks about tidal flats at the Old Port Pub near our study site.

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Copyright information

© Springer-Verlag GmbH Germany, part of Springer Nature 2018

Authors and Affiliations

  1. 1.Fisheries and Oceans CanadaBedford Institute of OceanographyDartmouthCanada
  2. 2.Department of OceanographyDalhousie UniversityHalifaxCanada

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