One of the hazards in the operation of coastal ports is the strength of the alongshore current at the seaward end of the breakwater or training walls so that the pilot can compensate and avoid grounding.
The Port of Rotterdam experiences alongshore currents of up to 2 knots, which are mainly tidal but also driven by winds, terrestrial outflow, and some larger-scale circulation in the North Sea (Van Heteren ).
Thompson, "Emergence of burrowing urchins from California continental shelf sediments: a response to alongshore current
reversals?" Estuarine, Coastal and Shelf Science, vol.
Simulations with XBeach in 2DH show that the alongshore current
and its interaction with the cross-shore processes lead to significantly more dune erosion, and that the coastal orientation with respect to the wave angle also plays an important role.
They found that while sea level shows a seasonal variability, the alongshore current
shows no clear seasonal cycle but is dominated by intraseasonal (55-110 day) fluctuations.
In addition to these orbital velocities, the inshore transport of momentum by surface waves under certain conditions drives an alongshore current that can reach velocities in excess of 1 m/s in the surf zone.
Larvae released at the shoreline, in addition to being carried downstream by the alongshore current, can be mixed into and out of these embayments.
He attributed this phenomenon to the decrease in the clastic material supply from the northerly situated provenances combined with the development of a complicated current system, including alongshore currents
, in the sea.
By remaining close to shore, within the coastal boundary layer, larvae would be subjected to alongshore currents
with reduced velocities and, with changes in the wind direction, alternating directions (Largier, 2003).
The alongshore currents
have the greatest effects on the sediment redistribution of this littoral.
Fifth, strong alongshore currents
, advection, and nutrient input from major rivers may contribute to a higher productivity in the western GOA and around Kodiak Island.
Martha's Vineyard and the Elizabeth Islands protect Woods Hole and make it a safe harbor, but they also block scientists from immediate access to undisturbed ocean waves and alongshore currents
. In contrast, the southward shoreline of Martha's Vineyard faces the open ocean.