Wednesday Jun 20, 2018

Wave Propagation

 

In the second phase of the monitoring and simulation studies of Iranian coastal areas, for the simulation of transporting the deep water waves to the shallow water waves, 3 sites have been studied, the five sites including the Naiband bay and Assalooye area, the second site including Kangan and Dayyer area, the third site including Ra’ase Mataf area. Firstly. the first site has been chosen as the base site and sensitivity study through different parameters like the bed roughness coefficient and white gapping event in Ra’ase moj has been accomplished for the conditions of considering it. For this approach, 5 different values for the bed roughness coefficient has been considered  in the range of 0-0.015 and the coefficient of the white gapping event/phenomenon in Ra’ase  maj has been considered 5 and 4.15 respectively. After comprehensive studies performed in the first site, the wave transport simulation in the second site Kangan-Dayyer with a method similar to the first site method, has been examined, regarding that the first site results have been used in this section.
The method of study is as follows: after introducing the study area, the wave characteristic measurement devices presenting in the considered area are introduced (AW, AQ1 and Sontec) and the measurement parameters and their time in the considered devices are expressed. After that, the considered area is meshed and using it the preliminary model is set up. Thereafter, the preliminary running is accomplished and the primary results are presented. In the next step, for obtaining each parameters effect, the value of the parameter is defined in the computational range; of course for determining the above range, the results obtaining from the first site have been used and comparing the model results, with the measured data the value of the parameter, has been calibrated. It should be noted that for obtaining this parameter’s effect, different time era's each representing a special month or season. These era's have been chosen in a way that conclude different conditions. This means that the different heights, different radiation direction, different periods, etc. exist in these era's. After calibrating the model in different time era's and through the considered parameters, the model validation has been implemented for an arbitrary time reach.
We need data like the simulation range, hydrographs, computational mesh domain, initial and boundary conditions, bed roughness characteristics, wind characteristics, water elevation, etc. for simulating the wave transport in the area. After accessing the above information, as the next setup, Bathymetry has been provided for simulation process based on the available hydrographs information. After providing bathymetry the model was set up.

 A sample from simulated area and the mesh used in the model

 A sample from simulated area and the mesh used in the model