علوم غیرزیستی دریا
bagher behrooz; mohammadreza khalilabadi
Abstract
One of the main and effective components in the formation of hydrodynamic conditions and characteristics of coastal areas is tidal. In this research, the pattern of fluctuations in water level and tidal flow in Arvand River is studied. The results of these studies will be used for sedimentation, erosion ...
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One of the main and effective components in the formation of hydrodynamic conditions and characteristics of coastal areas is tidal. In this research, the pattern of fluctuations in water level and tidal flow in Arvand River is studied. The results of these studies will be used for sedimentation, erosion and coastal morphological changes. The purpose of this study was to evaluate and validate the Arvandrood plume numerical hydrodynamic model using field measurements at tidal stations and achieving a tidal plane pattern. This numerical model has been developed based on the Eulerian method and has been used to determine the pattern of flow of water flow from continuity and displacement equations. The hydrodynamic modulus is the basic modulus of the flow model, it is necessary to explain that this simulator module solves on a network with structure and governing equations using finite difference. In this research, a 70x70 depth-of-dimensional file system was networked, two open borders (the boundary of the sea and the upper boundary of the river) were considered for the model. The downstream boundary of the time series of water level changes was applied to the upstream boundary Water level changes have been applied to boundaries as a constant number. After calibration, the comparison of the model results with field measurements shows that the mean squared error for the water level level is 238 m and for the water velocity, it is 127.0 m / s.
Omid Mahpeykar; Mohammadreza Khalilabadi; Karim Kenarkoohi
Abstract
ArvandRoud is known as the most important fresh water inlet of the Persian Gulf and plays a key role in controlling salinity, especially in its northern portion. Since the northern part of the Persian Gulf is exchanged with lagoons and wetlands due to tide, its salinity is of great importance to the ...
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ArvandRoud is known as the most important fresh water inlet of the Persian Gulf and plays a key role in controlling salinity, especially in its northern portion. Since the northern part of the Persian Gulf is exchanged with lagoons and wetlands due to tide, its salinity is of great importance to the ecosystem of the region and the coasts of Khouzestan. In this study, using the Mike model based on the three-dimensional solution of the Navier Stokes equations, assumption of incompressibility, Boussinesq aproximation, and hydrostatic pressure, the effect of Arvandroud on Persian Gulf salinity in two states has been investigated investigated: with a discharge rate of 1400 m3/s and without Arvandroud. The results show that by ignoring the entrance of the Arvandroud to the Persian Gulf, the peak of salinity at the Gulf increases to 7 PSU and affects the southern half of the Persian Gulf along the Arabian coasts. Also, results implicitly indicate that Arvandroud discharge rate has no effect on the amount of water entering and leaving the Strait of Hormuz.
علوم غیرزیستی دریا
Iman Khademi; Mohammad Akbarinasab; Abbas Ali Bidokhti; Mohammad reza Khalilabadi
Abstract
Turbulence is a form of movement characterized by an irregular or agitated motion. Turbulent motions are very common in nature. Most flows in the lower atmosphere and in the upper ocean are turbulent. The Turbulence has long had a special attraction for physicists and mathematicians; it has been called ...
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Turbulence is a form of movement characterized by an irregular or agitated motion. Turbulent motions are very common in nature. Most flows in the lower atmosphere and in the upper ocean are turbulent. The Turbulence has long had a special attraction for physicists and mathematicians; it has been called “the last great unsolved problem of classical physics”.In this study, hydrphysical measured data in the southern part of the Strait of Hormuz and with time step of half an hour during the period December 1996 to March 1998, by the University of Miami, and the meteorological station in island of Gheshm are used , then turbulence was simulated by General Ocean Turbulence Model (GOTM( . The results showed that, turbulent kinetic energy (TKE) in different seasons, with different penetration depths were appeared at during the year. In the cold season, the kinetic energy of the turbulent expands from surface to bottom and in the warm seasons because of existing the seasonal thermocline, depth penetration of TKE are limited, and only expands from surface to top of thermocline layer. In this study, investigation of the turbulent Prandtl number (Pr) shows that, effect turbulent viscosity Preference to the production buoyancy in the middle depth.