Application of 2-D tidal model, Shoaiba Lagoon, eastern Red Sea coast (original) (raw)
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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.
Water column conditions in a coastal lagoon near Jeddah, Red Sea
Water column conditions in a lagoon near Jeddah are investigated on the basis of changes in potential energy. Three major factors including balance of surface heat at the air-sea interface, wind and tidal mixing are considered. A negative potential energy change dvdt will develop stratification, whereas positive dv/dt will tend to mix the water column. The tidal effect is greater in summer with wind mixing showing no great variations. The buoyancy effect of the heat balance at the surface is negative from April to October. This negative buoyancy effect will tend to develop stratification but the positive contributions of wind and tide counteract this and the water column remains mixed except in September and October, when a weak stratification may develop. Generally, the water column remains practically mixed throughout the year. The change in heat content of the water column from mid-April to mid-September is about 3.3 × 108 J. During this period the net heat input at the air interface is about 2.0 × 108 J, which is about 40% less than the heat content of the water column, showing that the heat is advected towards the central area from the shallower periphery of the lagoon.
A hydrographic study of Ras Hatiba Lagoon, Red Sea
Ras Hatiba Lagoon is been classified by Presidency of Meteorology and Environment (PME) of Saudi Arabia with the collaboration of International Union for Conservation of Nature and Natural Resources (IUCN) as an environmentally sensitive area. This study is considered to be a baseline study for Ras Hatiba Lagoon. The lagoon is located at the eastern coast of the Red Sea. It is shallow with an average depth of 2m. Tidal force is dominating the water circulation in the lagoon.
Effect of Coastal Waves on Hydrodynamics in One-Inlet Coastal Nador Lagoon, Morocco
Modelling and Simulation in Engineering, 2015
Nador lagoon is a coastal system connected to the sea through a narrow and shallow inlet; understanding its hydraulic performance is required for its design and operation. This paper investigates the hydrodynamic impacts of the whole lagoon due to tidal waves using a numerical approach. In this study we use a two-dimensional, depth-averaged hydrodynamic model based on so-called shallow water equations solved within triangular mesh by a developed efficient finite volume method. The method was calibrated and validated against observed data and applied to analyze and predict water levels, tidal currents, and wind effects within the lagoon. Two typical idealized scenarios were investigated: tide only and tide with wind forcing. The predicted sea surface elevations and current speeds have been presented during a typical tidal period and show correct physics in different scenarios.
Two types of 1-D models and 2-D barotropic tidal model were developed and applied to a shallow Lagoon, in order to compare their capabilities. Negombo Lagoon in the west coast of Sri Lanka was chosen for the study. The spring tidal range in the lagoon is about 0.14m, which is approx. 30 % of the tidal range in the adjacent ocean. Comparison of the model results with actual measurements shows that all these models are capable of reproducing main features of tidal co-oscillation in the lagoon, however, the predictions with 2-D model found to be more accurate as compared with the 1-D models. The models were calibrated by adjusting the drag coefficient, C d specified in the quadratic form of bottom shear stress term. The different C d values were obtained for different models during model calibration. It was also found that the C d value required for 1-D model was somewhat larger than value obtained for the 2-D model, whereas the choked model values were the highest.
Water renewal in the Boughrara lagoon (Tunisia, central Mediterranean Sea) under tidal forcing
The aim of this study is to estimate the water renewal time in the Boughrara lagoon. This is a key parameter for ecological studies of the lagoon. The method used consists of the injection of a soluble tracer which has a concentration of zero at the open boundaries of the domain (C 0 ¼ 0) and is equal to one inside the lagoon (C 1 ¼ 1). In this study, we use numerical simulation modules developed by Deltares: the hydrodynamic Delft-Flow module and the Horizontal Large Eddy Simulation (HELS) module. We compute the horizontal advection and dispersion and get estimates, at every mesh of the computational grid, of the time needed for the tracer's concentration inside the lagoon to drop from 1 (C 1) to 0.38. This time is known as the Local Renewal Time (LRT). A spatial distribution analysis of the LRTs enables a subdivision of the domain based on the similarity of values near the LRT (at every mesh of the domain) and on the physical configuration of the domain (e.g. bay, deep/ shallow zone, harbor). Then it becomes simple to compute a renewal time for each region in the domain, which is the Integral Renewal Time (IRT). If we want to take into account the whole domain, we consider the maximum value of the IRT. The numerical simulations were run taking into account the effect of the predicted tide. The computational grid has a horizontal mesh size of 150 m � 150m. The LRT under only the effect of the tidal forcing at the zone where an aquaculture farm is located is estimated at one week. Moreover, in the region of the mini-gulf of Guellala, this LRT is estimated to be one month. The encounter between the waters coming from the two channels of the lagoon occurs after a period of four months in the zone bounded to the south by the island of Djilij and to the north by the mini-gulf of Guellala. South of the fishing port of Boughrara and Djilij Island, the local water renewal time varies between 5.5 and 6.5 months.
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.
Environmental Conditions of Two Red Sea Coastal Lagoons in Jeddah. 1. Hydrochemistry
Journal of King Abdulaziz University-Marine Sciences, 1998
AOSTRACT Arbaeen (AR) and Reayat Alshabab (RA) are two shallow lagoons in Jeddah lying on the Red Sea coast. Salinity. dissolved oxygen. hydrogen sulphide (H 2S) and Secchi transparency depth as well as bott om topography of the two lagoons are studied. The results reveal that each lagoon is a fjord like estuary hosting a dammed hypolimnitic anoxia and hypersaline water behind the sill s co vered by a surface brackish water. This water. augmented by entrained water. is freely Ilowing outside the lagoon and is compensated by a countercurrent of Red Sea water at mid depth (2 rn). The brackish water is a seawater mixed with non-saline water discharged from Jeddah sewage treatment plants. Periodic inllow of Red Sea waters into the lagoons frequently occurs but it is not sufficient to repla ce all the old. dense and euxinic resident waters and (0 stop the evasion of malodorous H 2S-gas , source of people complaint. The last problem can be panially solved (as short-term solution) by the application of artificial aerations of 'the hypersaline water layers.
Numerical investigation of tidal wave impact on residence time of Nador lagoon
In this work the impact of the tidal wave on residence time of Nador lagoon has been computed using an Eulerian approach and a 2D hydrodynamic model. The model is based on the finite volume method; it solves the shallow water equation on spatial domain that represents the Nador lagoon. The residence time has been defined through the remnant function of a passive tracer released inside the lagoon. The renewal capacity of the Nador Lagoon has been investigated when forced by the astronomic tide. The importance of the return flow on the residence time in the lagoon is shown. This influence has been defined by definition of the return flow and computed for two scenario.