The results of flood risk evaluation for the village Nakra, Svaneti.
2021
In order to protect the local population of Nakra village of Mestia region (Samegrelo-Zemo Svaneti territory, Georgia) from floods and mudslides, the results of field and theoretical research on the right tributary of the Nakra River, in the catchment basin of the Lekhverari River, are discussed. The principal geological, hydrological and hydraulic characteristics of the River Lekverari catch basin, as well as GIS and GPS technologies, were used to identify the sensitive sites of the river where landslide processes of various intensities are expected to originate. Mathematical modeling and software Volna-4 were used to identify the relation between the principal hydraulic and hydrological properties of the flood and mudflow wave formed in case of rupture of a 5-meter- high natural coffer solistone barriers in the riverbed and the time and geometry of the flooded area on the example of the River Lekverari. At the following stage obtained data can be used to realize preventive and complex engineering environmental measures to ensure the safety of the population of village Nakra against natural calamities. Such measures, together with other environmental protection measures, shall describe the regulation of the transit portion of both, the talus train and bed of Lekverari River by constructing the cascades of reliable springboard-type structures. Fig. 2, Ref. 15.
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