الفهرس 
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Abstract
Marine slopes are very important for the reclamation works stability which are constructed to develop the coastline. Aim of this thesis is to investigate the effects of wave pressure on the stability of sandy marine slopes under environmental wave load conditions. Study is conducted for a realistic range of values for the friction angle of sand, slope inclination, and sea wave characteristics at different depths and their influence is analyzed on the geotechnical stability of marine slopes. Two wave theories, linear (Airy) wave and Stokes 5th order wave are used to estimate the wave characteristics including wave height, wavelength, and wave pressure. The stability of slopes is calculated as a function of maximum wave height and wave period using Bishop’s simplified method which represents the moment equilibrium of slopes and Janbu’s simplified method which represents the shear equilibrium of slopes. Safety factor is calculated for a variable range of sliding surface radii to obtain the minimum safety factor. Water pressure above seabed is taken as variable external load on the slope. The extent of the sliding surface is chosen to be critical by including one wavelength, where its crest is on the shallow water side and its trough is on the deep water side. As expected, it has been found that increasing the wave height reduces the safety factor, while increasing depth along the slope increases the safety factor. For the same slope and wave height, increasing the angle of repose increases the safety factor and steeper seabed slope declines the safety factor. In the general, the difference in the safety factor calculated from Bishop’s simplified method and Janbu’s simplified method is not significant (difference within ± 5%). In addition, the wave pressure as calculated from linear (Airy) wave theory and Stokes 5th order wave theory, this difference is within ± 10%. The reduction in safety factor (SFr) calculated as (safety factor with wave load/safety factor without wave load) ranges from 100% for no wave case and up to 26.8% in extreme cases.