Simulation of tidal hydrodynamics in the Red Sea using COHERENS model (original) (raw)
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Tidal Constituents in the Persian Gulf, Gulf of Oman and Arabian Sea: a Numerical Study
2016
In this study, a three-dimensional coastal ocean model (FVCOM) is used in barotropic mode to simulate tidal amplitudes in the Persian Gulf, Gulf of Oman and Arabian Sea. Finite volume method is applied for solving hydrodynamic equations on an unstructured triangular mesh grid. Amplitudes and phases of 8 main tidal constituents are prescribed along the southern open-ocean boundary. To assess the model performance, the model results were compared with observational evidences. Amplitudes of tidal components observed at 9 tidal gauges in the region confirm the results of harmonic analysis performed on model outputs. Hence, it can be concluded that the amplitudes of 8 tidal components are well predicted by the model. Moreover, amphidromic points are accurately predicted from model results for these components. Also M2 and K1 are determined respectively as major semi-diurnal and diurnal constituents in entire domain. Finally, the tidal regime is classified by employing the form factor F i...
Oceanologia, 2020
Tidal characteristics of the Gulf of Khambhat are described based on measured and modelled sea-level data. Data were recorded at three locations inside and two locations outside the Gulf with record lengths of 6-12 months to study the tidal propagation. A northward increase in tidal amplitude is noticed from Daman (eastern side) and Diu (western side) and attains maxima at Bhavnagar. A similar trend is followed by the amplitude of the major tidal constituents, although there are discrepancies for that of the minor constituents. The non-tidal factor which influences the sea-level is the local wind, especially the alongshore component of wind. A positive correlation is obtained between the sea-level and the meridional component of wind at each location. Harmonic analysis of sea-level data shows that M2 is the major tidal constituent which propagates in a non-linear fashion inside the Gulf. Tides from two global tide models (MIKE21 and FES2014) have been compared with the measured data, which could be used for further prediction of the tides and sediment transport in the Gulf. The tide elevation derived from the MIKE21 model has further been used for the harmonic analysis of tide. The tides predicted using one-month data are up to 10% smaller than those predicted using the oneyear data. The global tide model FES2014 data performs well with measured data for offshore
A Study of Tidal Water Circulation Using a TwoDimensional Model in Jeddah Islamic Port, Red Sea
A two dimensional tidal depth averaged model was used to calculate the tidal currents in Jeddah Islamic Port which is the largest sea port in Saudi Arabia. The water circulation in Jeddah Port exhibits strong ebb to flood variability, reversing from west to east movement during both neap and spring tide respectively. Model results are compared with measured current meter data. The comparison showed a reasonable agreement between the modeled and measured current velocities. The renewal of the water within the port is important to ensure the quality of the sea water.
Simulation of Tidal Currents in the Persian Gulf
The developed 2D hydrodynamic model has been already applied and calibrated for the Persian Gulf to simulate the tidal currents in the Gulf. The location of Hormuz island at the Strait of Hormuz is suitable to represent the water level entering the Persian Gulf. Tidal elevations at different locations of the Persian Gulf are available. The simulation results show that after the first week of the February, a non-prevailing southeastern wind front took place. The verification of current hydrodynamic model was carried out with several case studies. Results were compared with available analytical solution or laboratory measurements. The results show the capabilities of this model for simulating the flow pattern in simple and complex geometry. The detailed of this hydrodynamic model including governing equations, solution techniques and verification tests is presented in authors' previous works. The tidal current in the Gulf is made by imposing tidal fluctuation to the main open boun...
A Process Study of the Tidal Circulation in the Persian Gulf
Open Journal of Marine Science, 2012
A homogeneous shallow-water model with free surface is used to model the tidal circulation in the Persian Gulf. The numerical finite-difference model includes harmonic diffusion of horizontal momentum and quadratic bottom friction, it has a 9 km mesh size and it is forced by 7 tidal components at its southern boundary. High precision bathymetric data are used to obtain the bottom topography. The numerical model is run for more than a year. The results are the following: 1) The model accurately reproduces the tidal phase and amplitude observed at 42 tidal gauges in the region. This accuracy is attributed to the presence of the 7 components which are able to interact nonlinearly; 2) The amphidromic points are also well positioned by the model due to a proper choice of bathymetry. This was checked also with a simpler geometry of the domain; 3) The tidal currents can be strong in the Straits of Hormuz and in shallow areas; thus they will have an effect of the hydrology of the region. The residual currents are weak so that they will be negligible for the large-scale circulation on long periods; 4) Finally, the sea-surface elevation forecast by the model is in close agreement with in-situ measurements of pressure in the Straits, performed during the GOGP99 experiment.
A TIDAL FLOW MODEL OF THE WESTERN COAST OF LIBYA
The Journal of Engineering Research (TJER), 2022
This paper presents the hydrodynamics on the western coast of Libya. The investigated area, which is a part of the Mediterranean Sea, is one of the most critical and active coastal regions in the country. A 2DH process-based model for flow based on the Delft3D modelling system from Deltares is constructed for the study area. Extensive field data concerning the tidal constituents were used. The flow model that is necessary to understand the hydrodynamics of the area was calibrated and validated using field measurements. In this paper, only the water levels and tidal components for the astronomical tide are presented. Calibration and validation of the numerical flow model show that the results of the water level represent the field conditions well. The present study gives insight into the basic hydrodynamic processes of the investigated area. It should help designers and the decision-makers maintain the region for any other economic and social activities. The flow model for the investigated area can be also coupled with any other models like wave, sediment transport, morphodynamic and water quality.
Tidal modelling in the Gulf of Khambhat based on a numerical and analytical approach
The Gulf of Khambhat is an inlet of the Arabian Sea along the west coast of India, in the state of Gujarat. Important future developments in the Gulf are planned with the construction of new oil, gas and chemical terminal and the closure of the upper part of the Gulf to create a freshwater reservoir to be used for irrigation and drinking water. The economical developments of the area have to deal with an important characteristic of the Gulf of Khambhat, which is the extreme tidal range that peaks to 10 m during spring tide and the consequent tidal currents with a peak velocity of more than 3 m/s. In this study, a two-dimensional numerical model of the Gulf has been implemented based on the Delft3D code to study the tidal propagation in the basin. The model has been calibrated and validated versus tidal measurements. Moreover, an analytical model for tidal propagation in converging estuary has been implemented based on the analytical work of Van Rijn (2011a). The two models show a go...
Simulation of Tidal in Khowr-e Musa by Using the TELEMAC Numerical Model
International Journal of Coastal and Offshore Engineering
Khowr-e Musa at the northwestern terminus of the Persian Gulf sedimentary basin is the widest and longest inshore marine outcrop in the entire coast of the iran at present. In this research, the tidal Current velocity and tidal water level in the Khowr-e Musa estuary was modeled in a 15-day period from 18th of November 2006 by using the Telemac two-dimensional hydrodynamic software. For this purpose, the irregular mesh in two dimensions was selected from the smallest mesh of 70 meters to the largest mesh of 210 meters. The topography of the area was added to the grid of mesh by using an interpolation method. Then TPXO database tidal data applied along the boundary of model. The friction coefficient was calculated using the Stickler theory with the value of 40 m1/2s-1 and the model was executed with a time step of 10 seconds. After Sensitivity analysis and calibration, the model was validated by using measurement data that's provided by the ports and maritime organization. The results showed a good correlation of 94% between the results of the water surface level of modeling the tidal and measurement data and correlation of 73% between the results of the current velocity of modeling the tidal and measurement data, so the TELEMAC two-dimensional hydrodynamic model is suitable for studying the tidal current.