علوم غیرزیستی دریا
masoud sadrinasab; mohammad fayaz mohammadi; Vahid Chegini; amir ashtari larki
Abstract
Arvandrood is the most important shipping river at the border of Iran and Iraq at the north of the Persian Gulf. As the border is determined by the talweg of the river, the changes of the talweg, as a result of erosion and deposition, is always considering. As a reason of inertia, current of the river ...
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Arvandrood is the most important shipping river at the border of Iran and Iraq at the north of the Persian Gulf. As the border is determined by the talweg of the river, the changes of the talweg, as a result of erosion and deposition, is always considering. As a reason of inertia, current of the river tends to keep his direction forward. In meanders which the current has to change his direction, the sidewalls of the river experience severe shear stress that leads to sharp decrease of current energy and water level fluctuation, and increase of suspended sediment concentration. To simulate this in Arvandrood river, a 3D hydrodynamic model, DHI MIKE 21/3, has been employed. This model is based on a flexible mesh and the numerical solution of the two/three dimensional incompressible Reynolds averaged Navier-Stokes equations invoking the assumptions of Boussinesq and of hydrostatic pressure. In the first step, the model results were verified by the measured data in 4 stations. Comparing the water level in Faw position was shown that the Root Mean Square Error is 0.16 which is a good figure. Then, the model outputs were analyzed which show that in a straight direction of 18 kilometer from Abadan to Khosroabad, water level fluctuation and suspended sediment concentration have increased 18% and 3.8% respectively; while it is 22% and 15% in a way of 17 kilometer with two meander.
علوم زیستی دریا
Nasrin Abdolkhanian; Heeva Elmizadeh; Ali Dadolahi Sohrab; Ahmad Savari; Mohammad FayazMohammadi
Abstract
Water resources under threat of pollution such as industrial waste, fertilizers, pesticides and urban sewage that negative effects on the environment and ecosystems. Arvand Rood is one of the most important navigable rivers in Iran, and it’s the most traffic place for floating which don’t ...
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Water resources under threat of pollution such as industrial waste, fertilizers, pesticides and urban sewage that negative effects on the environment and ecosystems. Arvand Rood is one of the most important navigable rivers in Iran, and it’s the most traffic place for floating which don’t have any system for delivery waste materials and discharging these waste materials in water making oil pollution. In this research, modeling pollution in the Arvand River using three-dimensional and hydrodynamic model to simulate how the pollution is studied, the Navier-Stokes equations in three dimensions and equations are solved transfer salinity and water temperature separation method. Boundary conditions applied, including changes in temperature, salinity and flow rate, temperature and salinity changes and apply for open border river and tidal components O1، S2، M2 and K1 open sea in the model used for the border. The results of modeling pollution in Arvand After running the model revealed that the pollution is pollution in the Arvand River according to location and time of release, In other words, in the Arvand River pollution from one point to another and from season to season is different, in fact, pollution is reciprocating mode. Diffusion of oil pollution in Arvand rood is depending to current. And in low tide because of same side of river current with low tide pollution reached to the Persion Gulf with high speed. The results shows, represent the effect of tie on diffusion pollution.