Impact of aquacultures on the marine ecosystem: modelling benthic carbon loading over variable depth...
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Impact of aquacultures on the marine ecosystem: modelling benthic carbon loading over variable depth Marko Jusup, Sunčana Geček and Tarzan Legović Ruđer Bošković Institute, Bijenička cesta 54, Zagreb, Croatia [email protected] , [email protected] , [email protected]
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Transcript of Impact of aquacultures on the marine ecosystem: modelling benthic carbon loading over variable depth...
Impact of aquacultures on the marine ecosystem: modelling benthic carbon loading over variable
depth
Marko Jusup, Sunčana Geček and Tarzan LegovićRuđer Bošković Institute, Bijenička cesta 54, Zagreb, Croatia
Tuna fishfarm near island Kudica, Adriatic SeaThunnus thyunnusMaena smaris (location Fulija)Pinna pectinata & Astropecten aurantiacus (location Kluda)Eupagurus prideaux & Adamsia paliata (location Veli Drvenik)Remnants of Mytilus galloprovicialis (location Veli Drvenik)Tuna fishfarm near island Fulija, Adriatic Sea
Photos courtesy of Donat Petricioli, Oikon d.o.o.
Random Displacement Model with gravitational settling:
jijj
ijizii dWtKdt
x
tKvtvdx ,2
,, 3 x
xx
jij
iii x
CtK
xx
Ctv
t
C,, xx
Advection-diffusion equation:
Random Displacement Model:
jijj
ijii dWtKdt
x
tKtvdx ,2
,, x
xx
Test case #1: Schematic view of bathymetry and BCL (in gC/m2day)
Cage centreSea surface
Bottom
x (m)
z (m
)
1 cm/s
-200 -150 -100 -50 0 50 100 150 200-60
-40
-20
0
20 a)
-200 -150 -100 -50 0 50 100 150 200-50
0
50
x (m)
y (m
)
a)
0.1 0.3
0.5 0.7 0.9 0.9
Test case #2: Schematic view of bathymetry and BCL (in gC/m2day)
Cage centreSea surface
Bottom
x (m)
z (m
)
-200 -150 -100 -50 0 50 100 150 200-60
-40
-20
0
20 b)
-200 -150 -100 -50 0 50 100 150 200-50
0
50
x (m)
y (m
)
b)
0.10.30.5 0.9 0.7
Test case #3: Schematic view of bathymetry and BCL (in gC/m2day)
Cage centreSea surface
Bottom
x (m)
z (m
)
-200 -150 -100 -50 0 50 100 150 200-60
-40
-20
0
20 c)
-200 -150 -100 -50 0 50 100 150 200-50
0
50
x (m)
y (m
)
c)
0.10.30.50.9
0.7
Test case #4: Schematic view of bathymetry and BCL (in gC/m2day)
Cage centreSea surface
Bottom
x (m)
z (m
)
-200 -150 -100 -50 0 50 100 150 200-60
-40
-20
0
20 d)
-200 -150 -100 -50 0 50 100 150 200-50
0
50
x (m)
y (m
)
d)
0.90.5
0.7
0.30.9
0.1
0.7
Test case #5: Schematic view of bathymetry and BCL (in gC/m2day)
Cage centreSea surface
Bottom
x (m)
z (m
)
-200 -150 -100 -50 0 50 100 150 200-60
-40
-20
0
20e)
-200 -150 -100 -50 0 50 100 150 200-50
0
50
x (m)
y (m
)
e)
0.10.30.50.70.9 0.9
Thank you for your attention!
Conclusion:
Approximating the realistic bathymetry with the uniform bottom can lead to serious error. It is possible to:•predict wrong shape of the maximum deposition region,•miscalculate its area,•give incorrect value and location of the maximum BCL,•fail to estimate the total area exposed to particulate waste.
