An innovative measure to protect the coastal zone of the sea located to the south of the "City channel" runoff of the Rioni River (from erosion)

Abstract

The paper discusses environmental and geomorphological problems in the Black Sea city of Poti. The impact of the new port protective mole on the ongoing erosion processes along the coast has been assessed. Using geotubes, an innovative scheme for the protection of the 400 m long shoreline south to the confluence of the Rioni River “city canal” has been developed. This shore protection scheme is effective only in the vicinity of the confluence of the "city canal", where the sediment is brought by the south direction flows generated by the river. For the selected storm, the propagation and collapse of the waves along the coast are investigated. The formula for calculating the transformation coefficient is selected. The stability of the structure of geotubes during storms is evaluated.  The western part of the coast guard construction designed by us causes the overrun waves to crumble and reduce the ripple load on the shore. Their placement under water ensures the return of returned water to the sea without additional circulations. At the same time, the northern and southern parts reduce the impact of coastal currents on the coast, which has a positive impact on the erosion processes taking place there.