الفهرس 
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Abstract
Water bodies in natural, artificial lakes and coastal lagoons located in the coastal zones are renewed through openings called tidal inlets which are defined as an opening in the coastal barrier separating the sea from the coastal lagoon through which water penetrates the land, thereby providing a connection between the ocean and bays, lagoons, and marsh and tidal creek systems. And tidal inlets are exposed to currents of different speeds according to the tidal value in the area and ebb and flood flow.Lakes mouths, shoreline locations where coastal sediments are partitioned via erosion, trapping, and redistribution, are responsible for the ultimate sedimentary architecture of shorelines near it and, because of their dynamic nature, also pose great management and engineering challenges.
El-Manzla Lake’s main tidal inlets and the effect of extending its main jetties offshore during the past three years is the main concern of this study at El-Gamil beach in Port Said city in Egypt. During 2019-2020 the western jetty of the main tidal inlet had been extended seaward by 300 meters, while the eastern jetty had been extended by 200meters.
The main goal of this study is to simulate the studied coastal region by using numerical modeling to predict the future impacts (shoreline evolution) that may be happened due to the extending inlet jetties offshore.
Theshoreline change statistics were calculated by the Digital Shoreline Analysis System software(DSAS). The research also studied the predicted shoreline and the impact of the extending inlet jetties’ lengths seaward on both the up and down drift side using a 1-D model (LITPACK). The results revealed that by changing the length of the jetties, significant sedimentation, and erosion patterns are seen along the inlet’s eastern and western sides.