In the city of Poti and its maritime region, for several decades there have been of environmental and geomorphological problems, which have been caused by anthropogenic interventions in this region. The impact of the breakwater of the new port of Poti on lithodynamic processes in the coastal zone is discussed in the paper. The sediment mass constancy equation is used in numerical experiments to determine the velocities of overbank and bank-driven sediment transport. To solve this equation, we use the finite element method and Crank–Nicolson schemes. According to calculations, 1,500,000 m3 of sediment migrates along the Nabada delta's banks, 850,000 m3 south of the delta to the harbor, and 65,000 m3 north of the delta to Khobiskal. The remaining 2,500,000 m3 is moved along the shore in a westerly direction before being dumped on the sea's underwater slope. After the new breakwater is built, all fine sediment movement in that direction will be stopped, and solid sediment will start to settle to the north of the new breakwater. Eventually, this will cause the southern branch of the Nabada Canal to become blocked. The total flow of water from the Nabada canal will be transferred to the northern branch, and the formation of a new delta will begin there.
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