SOLUTION OF RESERVOIRS' SILTATION PROBLEM FOR HYDROPOWER DEVELOPMENT AND COASTAL PROTECTION
Keywords:Accumulated Deposits, Equilibrium Channel, Mountain Reservoirs, Prism Train, Seashore
Georgia, as a seaside mountain country, faces three opposing issues: hydropower development, coastal protection, and flooding risks for riparian settlements and infrastructure. Present climate change will even more strengthen processes of beach abrasions. For study of silting prisms formation process and forecasting of the equilibrium channel on it, field natural experiment has been carried out on the small mountain rivers. The experiment showed that approximately for a year silting prism on some rivers closely reached its limited size and the equilibrium channel was formed. The silting prism in the tributaries, forms the sediment train that extended till the boundary of the top water level in the river. Length of train (L) is a function of the maximum flow discharge (QM), the deposit of runoff (R), diameter of bottom sediment (d) and initial inclination of riverbed (I). With the purpose of harmonious decision of all problems, eroded beaches periodically should be artificially filled by the river sediment, accumulated in the reservoirs. It’s necessary to organize a system of the quarries in reservoirs.