الفهرس 
INTRODUCTIONOnly 14 pages are availabe for public view
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Abstract
Coastal zones are one of the most important areas for human activities and infrastructure growth. However, the coastal zones are dynamic and need to be studied extensively before any infrastructure is planned in order to avoid damages due to natural processes such as erosion. It is suggested to establish a tool to be used for predicting the type of the most suitable coastal structure to face the different kinds of shore problems. Such tool might be a numerical module to suit the hydrodynamic behavior of the waves, the bed conditions, and the coastal zone use. The coastal problems should get more attention and care. Planning the infrastructure in the coastal zone focusing on development of the technology is necessary for sustainable development of the coastal areas. Collecting field data for many years such as bathymetry, waves, currents and sediment samples for all the coastline is necessary to create a new model to fulfill the purpose of the study. The Egyptian coastal area is taken as a case study for preparing a new model to give a proper plan for a perfect design and use of the coastal zone. The northern coast of Egypt is in a state of continuous fight against the actions of the Mediterranean waves and currents. The two branches of the Nile Delta (Rosetta and Damietta) had succeeded over the past years to be as a natural defence against the effect of sea due to the rich supply of sediment load coming with the water of the River Nile to the mouth of the branches. The shore protection structures have an effect on the near shore processes, which shape the shoreline and the profiles of beaches It also affects the near shore waves and currents, by decreasing the wave energy and trapping the sediment, which move due to the hydrodynamic effect. Till now the problems of shoreline change along the Nile delta coast is dealt with as site problems and some protection structures were constructed without considering the side effect at the down drift. The existing look to the problem is to protect certain sites regardless of the neighbouring sites, which might be affected badly by that protection work. It is essential to prepare a model for determining the positive and negative effect of any proposed protection method on the surrounding coastal area. The idea is to prepare a new module to determine the suitable type of protection against coastal erosion and the suitable dimensions of the structures to be used. The hydrodynamic behaviour of the waves at and around the breakwaters, submerged breakwaters, or groins has to be considered and analysed depending on the field data. The shore profiles are collected for previous years, the wave data and the bed material characteristics should be available. All the data should be analysed to be given as input to the module. The model has to be verified and checked. The new prepared model (coastal structure selection model) will be very useful in choosing the proper protection works against erosion or any expected problems at the surf zone. Certain structures can be used with beach nourishment in certain locations to slow the erosion rate. Stabilizing structures can be used to protect the beach nourishment projects causing reduction of sand losses from a segment of shoreline. A coastal program is prepared to select the shore protection structure type according to the land use. The program is easy to use and can be operated in a simple and easy way.