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Sea Cage Aquaculture
Circulation Models
To provide the context
in which to interpret water and sediment quality observations, we used
model simulations to assess the general hydrodynamics in the vicinity of
the farm seacages and to estimate material dispersal, flushing rates and
water mass exchanges.
Awarange Bay
In 2006/07 AIMS scientists conducted process measurements at Awarange
Bay using a vessel-mounted and a cage-mounted acoustic doppler current
profiler. These oceanographic instruments were deployed to refine the
existing models of circulation within the bay.
The goal of this part of the project was to improve the existing
estimates of residence time within the bay, as well as to model the fate
of particulate materials originating from the fish cages using particle
dispersion models.
This animation shows current speeds, with the blue areas being where
there is the highest current speed. (Click play button twice to activate.)
Ayong Farm, Lampung
During the same time, AIMS scientists went to Ayong Farm, Lampung, to
obtain information on the patterns of water movement and tides in this
area.
This animation shows the currents and the release of tracer particles
from Ayong Farm. (Click play button twice to activate.)
Material dispersal from the farm was estimated by tracking passive,
non-diffusive virtual particles released from the farm and advected by
simulated current fields. These virtual particles are not intended to
resemble real aquaculture waste products such as fish faeces or pellets of
food. They are best regarded as indicators of an individual "packet" of
water, and the concentration of the particles indicate how quickly that
"packet" is diluted and dispersed by physical processes alone.
