In this study, the capabilities of WAWEWATCH-III and MIKE21-SW for predicting the characteristics of wind-generated waves in Hormuz Strait are evaluated. The numerical models have been set up using Input data including GFS wind with 5o spatial resolution and 6 hours time intervals, along with the ETOPO1 bathymetry data with 2 arc-minute spatial resolutions. The results of the two model simulations were compared with the available satellite altimetry measurements of significant wave heights at the modeling area. The comparisons show that in deep water WAVEWATCH-III results in more reliable prediction of wave characteristics in comparison to the MIKE-21 SW. While in shallow area the MIKE-21 gives more consistencies with altimetry measurements. These may be due to the benefits of the unstructured grid which are used in MIKE-21, lead to better representations of the coastal area. The investigation on the direction of wind generated waves in the modeling area show that in some regions despite of the increase in wind speed, significant wave height remains nearly unchanged. This is mainly because of rapid changes in wind direction over the Strait of Hormuz.

Sea waves are one of the main characteristics of water areas in the world, which are mainly produced by wind. Waves are the main boundary condition in the dynamic loading and hydraulic calculations of coastal structures. Numerical models are being developed to bring the sea and ocean conditions closer to the real conditions. In this research, the SW model from MIKE21 software is used to simulate wind waves in the Chabahar Bay and the energy extracted from these waves is estimated. The SW model simulates the growth, transmission and decay of wind waves in offshore and coastal areas. Chabahar Bay is a semi-closed and subtropical bay with an average depth of 7. 5 m, which is located in the southeast of Iran. The model was implemented for a period of one year (2017) with a spatial resolution of maximum 5 km for offshore regions and less than 500 m in the interior parts of Chabahar Bay. ECMWF model wind data with a time step of 6 hours and a spatial resolution of 0. 125 minutes were used. Comparison of model results for hourly averages with measured data shows a correlation coefficient of 0. 84 for significant wave height. The annually average and maximum of wave height due to wind in the entrance of Chabahar Bay is 0. 82 m and 2. 19 m, respectively. The direction of the dominant waves is from south and the largest share of energy is related to waves with a period of around 11. The average of annual extractable power related to wind waves in the southern parts of Chabahar Bay was calculated from the order of 3 kW/m.

numerical model called MIKE21 was evaluated for simulation of dam and dike breaks. In recent years in Iran and other parts of the world some dike-breaches have been reported.Application of two-dimensional models in simulation of dike-breaches is inevitable, because of the nature of the flood propagation after the break. However, in Iran, there are very few two dimensional models used in river and floodplain issues. Hence, the performance of MIKE21 as a numerical model for simulation of dike break was investigated in this research. MIKE21 was originally developed for flow simulation in coastal areas, estuaries and seas. MIKE21's performance in simulation of dam and dike-break was studied via comparison with analytical solutions, other numerical approaches and available experimental data. Fair agreement has been observed, but care should be taken when modeling shock waves with MIKE21. The study was finally extended to a real case study. Some dike-break scenarios were considered in the Helleh River, in Iran and the results are discussed and presented.