Peculiarities of Intra-Annual Distribution of Landslide Recurrence in Adjara and Guria Regions (Western Georgia) and in Eastern Georgia and their Relationship with Monthly Sums of Precipitation

Abstract

Correlation and regression relationships between the intra-annual distribution (%) of the relative number of landslides and the relative precipitation amounts in the month of the landslide occurrence were studied for the regions of Adjara and Guria (Georgia), and Eastern Georgia. Specifically, it was found that the intra-annual distribution of landslides across the studied territories of Georgia is quite uneven. The highest relative number of landslides in Adjara and Guria occurs in October (18.7%), and the lowest in August (3.4%). The highest relative number of landslides in Eastern Georgia occurs in June (12.4%), and the lowest in July (6.4%). In Adjara and Guria in the linear approximation, correlation coefficient R between intra-annual distribution of the recurrence of landslides and mean sum of precipitation during the month of their activation is moderate (R=0.62), and in the case of approximation by a third-degree polynomial - index of correlation R' is high (R'=0.80). In Eastern Georgia between specified parameters mostly linear correlation is observed (R=0.60, moderate correlation). The level of nonlinear relationships does not go beyond moderate correlation.