## 3 Results and Discussion
Finally, Figure 9c illustrates also a high wave energy situation in the computational domain Cart3 (the coastal environment close to the Romanian city Mangalia) corresponding to the time frame 18 December 2017. The maximum values of the significant wave height and wave power are in this case _Hsmax_ = 5.3 m and _Pwmax_ = 71 kW/m. These maximums correspond both to the same point, located in the southern right corner of the computational domain. Figure 6: High wave conditions at the mouths of the Danube River (computational domain Sph3), model results corresponding to the time frame 22 March 2017. **(a)** Significant wave height scalar fields and wave vectors (represented by black arrows); **(b)** wave power scalar fields and energy transport vectors (represented by red arrows). Some observations can be made at the end of this section. First of all, as already mentioned, the cases presented are related to high winter time wave conditions. They were selected as representative, but at the same time, although cannot be considered very usual, they do not represent unusual situations since such wave energy conditions are encountered with a certain frequency in the winter period. Another observation is related to the fact that usually the maximum values of the significant wave height and of the wave power do not occur exactly in the same point, but they are very often in closer positions from a geographical perspective. Finally, although there is a direct relationship between the wave power and the significant wave height, a certain significant wave height does not automatically indicates the value of the wave power. Thus, according to the results presented in Figure 4 (for the domain Sph1), a _Hsmax_ = 5.2 m corresponds a _Pvmax_ = 70 kW/m. On the other hand, as Figure 6 shows (for the domain Sph3), a _Hsmax_ = 5.2 m corresponds a _Pvmax_ = 58 kW/m, while according to Figure 8 (related to the domain Sph3), a _Hsmax_ = 4.9 m corresponds to a _Hvmax_ = 5.2 m. The _Hvmax_ = 5.2 m corresponds to a _Pvmax_ = 58 kW/m. The _Hvmax_ = 5.2 m corresponds to a _Pvmax_ = 58 kW/m. _Pwmax_ = 76 kW/m. The explanation of these differences can be found in the definition of the wave power components (Equation (5)). Thus, the components of the wave power depend not only on the energy spectrum, but also on the velocity of the wave group. This means that for the same significant wave height, if the waves travel faster, they will have a higher energy. Figure 9: Wave power scalar fields and energy transport vectors (represented by red arrows) in the high resolution Cartesian domains defined: (**a**) Cart1—Sulina bar, average to high wave energy situation corresponding to the time frame 8 November 2017; (**b**) Cart2—Sacalin Peninsula, high wave conditions, time frame 28 November 2017. (**c**) Cart3—Mangalia nearshore, high wave conditions, time frame 18 December 2017. Finally, at the end of this section it can be highlighted that, although the results of this work are focused on the coastal environment of the Black Sea, most of them reflect the general trends encountered in the coastal environment, indicating the fact that the effects of the climate change is rather similar in many nearshore areas [47; 48].