Numerical simulations of onshore transport of larvae and detritus to a steep pocket beach
Fujimura, Atsushi G.
Reniers, Ad J.H.M.
Paris, Claire B.
Shanks, Alan L.
MacMahan, Jamie H.
Morgan, Steven G.
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Larvae of intertidal invertebrates need to cross the surf zone to settle in their adult habitat. Onshore transport of invertebrate larvae and detritus at a steep beach was simulated with a biophysical larval tracking model. Hydrodynamic model calculations were performed for 24 h after a 24 h spin-up stage with bathymetry and averaged wave data obtained during the summer of 2011 at Carmel River State Beach, California, and with and without onshore wind. The physical model output was then transferred to a Lagrangian larval tracking model using several types of particles representing larvae. A southward alongshore current controlled particle distribution in the middle and north of the domain. At the southern shore, negatively buoyant particles were trapped by eddies generated between the alongshore current and shore, while positively buoyant particles were carried onshore by wind-driven surface currents. The concentration of modeled detritus in the surf zone was positively correlated with that of negatively buoyant larvae. Additionally, the concentrations of detritus and competent larvae within the surf zone were negatively correlated with wave height, consistent with the observations of the accompanying field study. Some eddies contributed to forming high particle concentration patches by trapping them in the surf zone. More small eddies were generated closer to the shore with smaller waves, leading to high larval and detrital concentration in the surf zone. As waves increased in size, fewer and larger eddies formed, predominantly outside the surf zone, and consequently fewer larvae and detritus particles entered or stayed in the surf zone.
The article of record as published may be found at http://dx.doi.org/10.3354/meps12331
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Fujimura, Atsushi G.; Reniers, Ad J.H.M.; Paris, Claire B.; Shanks, Alan L.; MacMahan, Jamie H.; Morgan, Steven G. (2014);Competent larvae of intertidal invertebrates have to migrate toward shore for settlement; however, their migration through the surf zone is not understood. We investigated larval transport mechanisms at a ripchanneled beach. ...
Shanks, Alan L.; MacMahan, Jamie; Morgan, Steven G.; M Reniers, Ad J.H.; Jarvis, Marley; Brown, Jenna; Fujimura, Atsushi; Griesemer, Chris (Inter-Research, 2015);Larvae of many intertidal species develop offshore and must cross the surf zone to complete their onshore migration to adult habitats. Depending on hydrodynamics, the surf zone may limit this migration, especially on ...
Morgan, Steven G.; Shanks, Alan L.; MacMahan, Jamie; Reniers, Ad J.H.M.; Griesemer, Chris D.; Jarvis, Marley; Fujimura, Atsushi G. (ASLO Association for the Sciences of Limnology and Oceanography, 2017-05-09);Surf zone hydrodynamics vary along shorelines potentially affecting the delivery of larvae and zooplankton subsidies to intertidal communities, and, hence, the intensity of postsettlement interactions, growth and reproduction ...