ИЗМЕНЧИВОСТЬ ГОДОВОГО СТОКА РЕКИ АЛАЗАНИ (ГАНЫХ)

Abstract

Abstract. The analysis of spatial and temporal regularities of the annual runoff of the transboundary river Alazani (Ganikh), which flows through the territory of Georgia and Azerbaijan, has been carried out. The series on the average annual water discharge of 6 hydrological gauges for the period from 1925 to 2017/2019 was used. It was found that for the researched rivers, the fluctuations of the average annual water discharges are in phase, however, the absence of strict synchronicity in the fluctuations of the annual runoff leads to a decrease in the spatial correlation coefficients. In the studied series of river Alazani (Ganikh) both on the territory of Georgia and Azerbaijan, there is no trend; however, for a number of annual runoff of the Ayrichai River, the main tributary of the r. Alazani (Ganikh), a significant positive trend was revealed. It should be noted that the reason for the nonstationarity is the climate change, the impact of which on runoff has become noticeable in recent decades. It was found that the variance of the second half of the analyzed series increased. The annual runoff of the Alazani (Ganikh) River has changed very little over 1991-2017 / 2019 compared with the period 1961-1990. For the Ayrichai River, the second period is characterized by increased water content. Keywords: River Alazani (Ganikh), Annual runoff, Water discharge, Transboundary river, Runoff change.