Groin Opening Effect on Shoreline Evaluation Studies for Shore Protection Design. Estimation of Seismic Forces And Analysis of Quay Wall In KACC Marina In The Eastern Zone of KSA A Study on The Use of Semi-Open Groin System for Protecting The North-West Coast of Egypt Along The Mediterranean Sea A New Technique For Estimating The Stable Weight Of Armor Units On A Submerged Breakwater In Wave-Current Coexisting Field Flushing Process within Perched Beaches Development of Low Crested Breakwaters for safe swimming and shore protection along the North-West coast of Egypt