This book is based on the thesis of Engineer Mohammed Esmail for his master of science at the faculty of engineering Mansuora University, Egypt. His work was guided in close cooperation by the principal supervisor Prof. A.Zidan. Co-supervisors were Prof. O.Rageh and Assoc.Prof .Th.Sarhan. The near shore region is highly dynamic system when waves, currents, and bathymetry interact through a complex feed back mechanism in response to changing wave climates and sediment budgets The northern Egyptian coasts are subjected to many changes on shoreline balance due to waves and coastal currents. To protect and develop these coasts, many types of breakwaters have been constructed such as groins, seawalls, detached, submerged, and shore-connected breakwaters. The built-in CGWAVE model was used to simulate the wave propagation along Ras El-Bar beach, Egypt, due to the effect of different break waters. Detached breakwaters and interaction between different systems of the existing breakwaters provide higher values of wave energy dissipation. Shoreline changes along Ras El-Bar beach were also studied under the different wave characteristics. A-R Zidan, M. Esmail