STUDY OF HYDROMETEOROLOGICAL CONDITIONS IN THE WATERWORKS DESIGN ON THE ABIN RIVER IN THE KRASNODAR TERRITORY

Purpose: to analyze the climatic characteristics of the study area and hydrological characteristics of the studied watercourse, including maximum water discharges in section lines marked along the river bed, as well as maximum water levels of the Abin River, in the volume necessary for a reasonable choice of design solutions for bank protection hydraulic structures. Materials and methods. The Abin River was studied from 1923 to 1989 at the water gage in Abinsk. Observation data allowed analyzing the regime, level and estimating the discharges. The average annual precipitation is 704 mm, with a peak in December (85 mm) and minimums in April and September (45 mm each). Heavy rains occur in the summer, with a maximum of 171 mm per day. Ice and rime phenomena occur in the area, but they are mostly short-lived. Extreme hydrometeorological phenomena are possible due to the orographic features of the region. Results. The Abin River is a mountain river with water level fluctuations of up to 8.6 m and the rising large wooden debris during floods. Calculations of maximum discharges and water levels were carried out, the average current velocity reaches 2.68–3.40 m/s, and the maximum depth is 7.54–7.64 m. Channel processes include bed erosion and limited meandering with a stable bank position. The bed erosion depth varies from 0.78 to 1.06 m. Conclusions. When developing bank protection structures on the Abin River, it is necessary to take into account several important aspects. The structures must withstand significant water discharges (at a speed of 2.68–3.40 m/s and a depth of 7.54–7.64 m BS) and ensure durability during floods. It is necessary to strengthen the foundation and reinforce the slopes using geosynthetics, and provide flexible structures (gabions and Reno mattresses) to adapt to channel changes. It is possible to use technologies that minimize interference with nature, such as anchor systems and the creation of bulkheads. It is recommended to use methods for the redistribution of sediments, including flooded spurs.