scholarly journals Cage size affects dissolved oxygen distribution in salmon aquaculture

2018 ◽  
Vol 10 ◽  
pp. 149-156 ◽  
Author(s):  
T Oldham ◽  
F Oppedal ◽  
T Dempster
Keyword(s):  
Dissolved Oxygen ◽  
Oxygen Distribution ◽  
Salmon Aquaculture ◽  
Cage Size

scholarly journals Numerical Solution of a 3-D Advection-Dispersion Model for Dissolved Oxygen Distribution in Facultative Ponds

2018 ◽  
Vol 31 ◽  
pp. 03006 ◽  
Author(s):  
Sunarsih ◽  
Dwi P. Sasongko ◽  
Sutrisno
Keyword(s):  
Dissolved Oxygen ◽  
Oxygen Concentration ◽  
Dispersion Model ◽  
Oxygen Distribution ◽  
Dissolved Oxygen Concentration ◽  
3 Dimensional ◽  
Advection Dispersion ◽  
Advection Diffusion Equation ◽  
Advection Diffusion ◽  
The Finite Difference Method

This paper describes a mathematical model for the dissolved oxygen distribution in the plane of a facultative pond with a certain depth. The purpose of this paper is to determine the variation of dissolved oxygen concentration in facultative ponds. The 3-dimensional advection-diffusion equation is solved using the finite difference method Forward Time Central Space (FTCS). Numerical results show that the aerator greatly affects the occurrence of oxygen concentration variations in the facultative pond in the certain depth. The concentration of dissolved oxygen decreases as the depth of the pond increases.

Numerical Simulation of Dissolved Oxygen Transfer in an Aerated Pond

2014 ◽  
Vol 587-589 ◽  
pp. 588-593
Author(s):  
Guang Lin Wu ◽  
Liang Sheng Zhu ◽  
Fang Cheng Li
Keyword(s):  
Numerical Simulation ◽  
Dissolved Oxygen ◽  
Transfer Process ◽  
Oxygen Transfer ◽  
Water Circulation ◽  
Flow Structures ◽  
Oxygen Distribution ◽  
Water Pond ◽  
Water Wheel ◽  
Volume Method

Dissolved oxygen transfer in an aeration pond was studied by numerical method in this paper. 2d water pond current induced by water-wheel aerators and oxygen transfer process was simulated by finite volume method. In order to verify the relationships between current and dissolved oxygen transfer, we set 4 layout styles with 4 aerators in a water pond. It is proved that different layout styles induce different flow structures and dissolved oxygen distribution. Traditional layout (style a) is not the best way for oxygen transfer, and other styles (style b, c &d) are all superior to the traditional layout. But water flow structures are not the same results. Water circulation performance is style a, c, b, d in sequence. Style c (flow to corners along pond wall) is the best way by comprehensive consideration of both water circulation performances and dissolved oxygen distribution.

scholarly journals Suboxic and anoxic conditions in the Gdansk basins’ deep water (the Baltic sea)

2019 ◽  
Vol 59 (5) ◽  
pp. 714-723
Author(s):  
K. V. Artamonova ◽  
A. N. Demidov ◽  
O. A. Zuev
Keyword(s):  
Dissolved Oxygen ◽  
Baltic Sea ◽  
Oxygen Concentration ◽  
Deep Water ◽  
Hydrogen Sulphide ◽  
Bottom Layer ◽  
Oxygen Distribution ◽  
The Baltic Sea ◽  
Anoxic Conditions ◽  
The Baltic

Variability of oxygen and hydrogen sulphide concentrations in the Gdansk basins deep water of the Baltic Sea for the last 25 years was analyzed. It was shown that suboxic and anoxic conditions in deep water were mainly determined by Baltic inflow frequency and intensity. Oxygen concentration in the bottom layer of the Gdansk basins increased strongly in 13 months after Major Baltic Inflow events (MBI). There were three periods of strong increasing of dissolve oxygen concentration in deep water since 1992 till 2018 after MBI in 1993, in 2003 and 20142016. It was shown that at the bottom of the Gdansk basins hydrogen sulphide was detected during 79 months till 22.5 years after MBI. Quality evaluation of dissolved oxygen distribution reanalysis was also conducted in this work. It can be noted good reproduction of field data by the reanalysis in its quality part; however, in most cases the observable maximum concentrations in dissolved oxygen distribution are understated, sometimes even several times.

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