Abstract
In New Brunswick, Atlantic Canada, Tabusintac Bay’s multiple tidal inlets meander through narrow barrier islands and are prone to large storm-induced shifts, making navigation hazardous. A multi-evidence assessment comprised of air-photo analysis, field observations and modeling was undertaken to understand the system and recommend sustainable dredging strategies and/or engineering alternatives. The modeling relied on a combination of simple analytical methods for tidal inlet stability, and complex morphological modeling to project the evolution of the nearshore bathymetry. The study recommended reassigning dredging efforts to a new inlet projected to grow and have better stability. Observations two years after the initial modeling effort indicate that the morphological evolution is consistent with the simulation results, and allowed lowered maintenance dredging requirements. This study illustrates how such a multi-evidence assessment of complex coastal dynamics can concretely guide efforts to reduce maintenance dredging and improve safety at sea.
Highlights
The shoreline of northeastern New Brunswick on the Gulf of St
Atlantic Canada, consists of a 14 km long system of barrier beaches fronting drowned river bays flushed by tides through sandy inlets (Figure 1)
At Tabusintac Bay, the narrow barrier islands are prone to breaches from northeasterly storm waves, and tidal inlets tend to migrate southward with the longshore sediment transport
Summary
The shoreline of northeastern New Brunswick on the Gulf of St. Lawrence, Atlantic Canada, consists of a 14 km long system of barrier beaches fronting drowned river bays flushed by tides through sandy inlets (Figure 1). At Tabusintac Bay, the narrow barrier islands are prone to breaches from northeasterly storm waves, and tidal inlets tend to migrate southward with the longshore sediment transport.
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