Environmental Engineering Reference
In-Depth Information
the end of August. By this time, all surviving juveniles were expected to have
become demersal, following settlement to the seabed. The model time-step was 1 h.
Of all the possible components of the biophysical model outlined in Fig.
20.1
,a
summary of the different model setup combinations used in the sensitivity analysis
runs is presented in Table
20.1
.
The baseline simulation had a single particle release date within the spawning
areas (defined for each of the ten sub-populations), corresponding to their specific
date of peak egg production (ranging from day-of-year 62-69). The simulation was
purely deterministic in relation to horizontal
transport
(horizontal diffusion
flowfields (u,v,w*)
T*, S*
others* (diffusivity, turbulence, etc.)
meteorological
data
HYDROGRAPHY
(HDM)
“PARTICLE-TRACKING” MODEL
initial conditions
(e.g. egg production*)
LOWER TROPHIC
LEVEL MODELS*
(e.g. NPZD)
growth*
BIOLOGICAL
MODELS
swimming
behaviour* (e.g. DVM)
mortality*
(“super-
individual”)
HIGHER TROPHIC
LEVEL MODELS*
final conditions
(e.g. settlement*)
Fig. 20.1 Schematic diagram of the components of a biophysical model of fish early life stages.
Asterisks
indicate non-critical components;
solid arrows
are inputs/outputs and
dashed arrows
indicate constituent components. Abbreviations: HDM: hydrodynamic model; u, v and w are the
three-dimensional velocity components, where w is the vertical component; T: temperature;
S: salinity; NPZD: nitrate, phytoplankton, zooplankton, detritus model; DVM: diel vertical
migration
Table 20.1 Summary of the model setup combinations used in the different runs (see text for an
explanation)
EP
H.diffusion
Behaviour
Mortality
Settlement
Single date
No
Fixed
No
Time
Single date
No
Fixed
Yes
Time
Single date
10 ppsp
Fixed
No
Time
Single date
50 ppsp
Fixed
No
Time
Single date
100 ppsp
Fixed
No
Time
Gaussian
No
Fixed
No
Time
Single date
No
DVM
No
Time
Single date
No
Ontogenetic
No
Time
Single date
No
Fixed
No
Complex
Single date
50 ppsp
Ontogenetic
yes
Complex
Gaussian
No
Ontogenetic
yes
Complex
The top row describes the characteristics of the baseline run
EP
egg production,
H.diffusion
horizontal diffusion,
ppsp
particles per start position,
DVM
diel
vertical migration
