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ANNUAL WATER RUNOFF, SUSPENDED AND DISSOLVED LOAD OF LAKE SEVAN INFLOW STREAMS
Abstract
Water discharges, suspended load and hydrochemistry for 35 inflows of largest Caucasian Lake Sevan were measured 3 times in different hydrological seasons during 2024 and 2025. During summer most of small streams dried out while in winter a number of rivers were frozen into the bottom. The water discharges varied from 0.01 in summer to 8.02 m3/sec in spring. Large natural inflows are Argichi, Dzknaget, Gavaraget, Masrik rivers with water discharges in spring 8.0, 6.3, 4.5, 2.8 m3/sec correspondingly. By the end of summer, the Gavaraget River has the highest water discharge (4.6 m3/sec), but discharges of the Dzknaget and Masrik Rivers decreases in summer and winter by more than an order of magnitude. Minimal turbidity amplitude was in winter - 2.8-6.5 mg/l, highest - in spring - 218 - 3596 mg/l with Cs/Cv=1.5. The average turbidity values detected in inflows during spring, summer and winter were 224, 21 and 2.8 mg/l respectively. Conductivity and TDS have no high variability through the year with maximal value in summer 486 -S/cm (r.Drakhtik) and winter 254 mg/l (r.Masrik) with the biggest ionic discharge 610 mg/sec in spring (r.Gavaraget). pH values reflect neutral or light alkaline waters. Throughout the year, inflows had oxygen conditions with occasional oversaturation. NO2+NO3 concentration reached highest values in winter but phosphate - in spring which are toxic for fluvial and lake ecosystems during fish spawning. Silicates play a significant role in summer and winter.
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