Abstract
This paper is presenting the results of an extensive field and numerical modeling investigation of a morphologically dynamic tidal inlet. Shippagan Gully is a tidal inlet located near Shippagan, New-Brunswick, Canada, on the Gulf of Saint Lawrence. It is a particularly complex tidal inlet due to the fact that its tidal lagoon transects the Acadian peninsula and is open to the Bay des Chaleurs at its opposite end. As such, two open boundaries with phase lagged tidal cycles drive flow through the inlet, alternating direction with each tide and reaching velocities in excess of 2 m/s. Hydrodynamic and morphological processes at the site are further complicated by the presence of a highly variable wave climate. Presently, shipping practices through the inlet are limited due to continual sedimentation within and immediately offshore from Shippagan Gully. As such, an extensive field study, desktop analysis and numerical and morphological modeling of Shippagan Gully have been conducted in order to provide guidance for future works. Modeling was conducted using the CMS-Wave and CMS-Flow numerical modeling system. Sedimentation inside the inlet was shown to be ebb tide-induced deposition; while wave induced deposition was demonstrated elsewhere. The methodology and selected results of this study are presented herein.
Highlights
Shippagan Gully is a coastal inlet located on the Gulf of St
Hydrodynamics were simulated for a total of 137 days, which results in 2192 days of morphological time, or 6 years
The numerical model results indicate that morphology changes which occur at locations B and C are tidedominated
Summary
Shippagan Gully is a coastal inlet located on the Gulf of St. Lawrence near Shippagan, New. Brunswick, Canada (Figure 1). The inlet, which is shown, has been maintained using man-made coastal structures since the late 1800’s, as its navigability has proven crucial to the local economy which is governed in large part by the fishing industry. Natural sediment bypassing along the Gulf of St. Lawrence coastline was inadvertently interrupted, an impact characterized by a shoreline retreat of over 200 metres immediately to the west of Shippagan Gully. Sediment accumulation within the inlet became increasingly apparent, on the east side of the channel, where navigable depths were steadily declining. In addition to the accumulation of sediment within the channel, the ability to navigate through the inlet was continually threatened by the presence and growth of a large crescentric ebb shoal located offshore
Sign-in/Register to view highlights & summary Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
