Structure, variability, and salt flux in a strongly forced salt wedge estuary Public Deposited

http://ir.library.oregonstate.edu/concern/defaults/xp68kh95m

Descriptions

Attribute NameValues
Creator
Abstract or Summary
  • The tidally varying circulation, stratification, and salt flux mechanisms are investigated in a shallow salt wedge estuary where fluvial and tidal velocities are large and the steady baroclinic circulation is comparatively weak. The study integrates field observations and numerical simulations of the Merrimack River estuary. At moderate to high discharge the estuary is short and highly stratified, while at lower discharges it shifts to a longer, more weakly stratified estuary; the transition occurs when the length of the salinity intrusion is similar to the tidal excursion. The Merrimack is highly variable at tidal time scales owing to the advection and mixing of a bottom salinity front. Salt flux is predominantly due to tidal processes rather than steady baroclinic or bathymetric shear. Tidal pumping is important near the mouth, but inside the estuary salt flux is due to tidal asymmetries in the elevation and thickness of the halocline that depend on the tidal amplitude and river discharge. Conditions in the Merrimack, including the salinity intrusion length and stratification, vary more with event to seasonal shifts in river discharge than with spring‐neap changes in tidal amplitude. An unstructured grid hydrodynamic model is used to simulate conditions in the Merrimack and model results are compared quantitatively against field observations. The model achieves a high skill against time series of water level, salinity, and velocity and captures the spatial structures of salinity, velocity, and salt flux observed in along‐ and across‐estuary transects. High model skills depend on accurate and well‐resolved grid bathymetry and low background vertical and horizontal diffusivities.
Resource Type
DOI
Date Available
Date Issued
Citation
  • Ralston, D. K., W. R. Geyer, and J. A. Lerczak (2010), Structure, variability, and salt flux in a strongly forced salt wedge estuary, J. Geophys. Res., 115, C06005, doi:10.1029/2009JC005806.
Series
Keyword
Rights Statement
Funding Statement (additional comments about funding)
Publisher
Peer Reviewed
Language
Replaces
Additional Information
  • description.provenance : Approved for entry into archive by Sue Kunda(sue.kunda@oregonstate.edu) on 2011-09-23T21:55:38Z (GMT) No. of bitstreams: 1 LerczakJames.COAS.StructureVariabilitySaltflux.pdf: 1389759 bytes, checksum: d4ef78154392b45705a8247b6b4ee848 (MD5)
  • description.provenance : Submitted by Deborah Campbell (deborah.campbell@oregonstate.edu) on 2011-09-21T20:30:34Z No. of bitstreams: 1 LerczakJames.COAS.StructureVariabilitySaltflux.pdf: 1389759 bytes, checksum: d4ef78154392b45705a8247b6b4ee848 (MD5)
  • description.provenance : Made available in DSpace on 2011-09-23T21:55:38Z (GMT). No. of bitstreams: 1 LerczakJames.COAS.StructureVariabilitySaltflux.pdf: 1389759 bytes, checksum: d4ef78154392b45705a8247b6b4ee848 (MD5) Previous issue date: 2010-06-09

Relationships

In Administrative Set:
Last modified: 07/25/2017

Downloadable Content

Download PDF
Citations:

EndNote | Zotero | Mendeley

Items