Features of the Hydrological Structure of Varna Lakes and the Atmospheric Impact on the Water Area in the Period 2022–2023

Abstract

The results of continuous direct measurements of the water temperature and salinity in the surface layer in two points for the period June 2022–August 2023, as well as from 102 vertical profiles obtained during seven polygon quasi-synchronous seasonal surveys of the water area of Varna Lakes, are shown. The intra-annual cycle of variability of both hydrological characteristics is reconstructed experimentally, and characteristic peculiarities of their vertical distribution during the different seasons are deduced. Based on data registered from a coastal meteorological station on the bank of the channel between the lakes, as well as from other two regional ones, the character of atmospheric influences on the studied water area for the indicated period is summarized. The salinity in Beloslav Lake is significantly affected by the inflow of the Provadiyska river and the precipitation in the area.