Fishery Water Releases to the Lower Pool of the Volgograd Hydroelectric Power Plant

Conditions of fish reproduction in the Volga–Caspian Basin depending on the hydrological regime in the Volga lower reaches, transformed by water withdrawals and regulatory impact of reservoirs are considered.     

Lake Baikal and the Angara River before and after the Construction of Reservoirs

Variations in the regime of the Angara River flow fluctuations and in the components of the water balance of Lake Baikal are discussed.     

Flowage Lakes in the World: Analysis of Quantitative Characteristics and Their Effect on the Character of Flow Variations of Lake-Containing Rivers

Water Resources - A joint data repository on flowage lakes of the world and long-term flow variations in the rivers they regulate has been formed. The specific features of the flowage lake...     

Simulating a non-Gaussian vector process with application in hydrology

An algorithm is proposed for simulating a hydrological random process for the case of a vector, whose components are runoff values for the Khoper R. in three high-water months and the Volga R. in February, April, and the average over April, May, and June. The simulation is shown to have a high accuracy: the expectations and the coefficients of variation exactly coincide with specified values; the skewness has an accuracy of 0.1; the deviation of the coefficients of autocorrelation and cross-correlation of vector components from the specified values never exceeds 0.05.     

Dynamic–Stochastic Modeling of Rivers Rising from Lakes

Problems arising in modeling long-term variations in rivers rising from lakes are discussed in the context of the theory of correlation of non-Gaussian stochastic processes and with the use of Fokker–Plank–Kolmogorov equation. Numerically simulated runoff values of the Angara River rising from Lake Baikal are given.     

Modeling Water and Salt Balance of Bol’shoe Yashaltinskoe Lake

This article is the first to give morphometric and bathymetric relationships for Bol’shoe Yashaltinskoe Lake, derived by processing expedition data. A bathymetric map of the lake is constructed. A method is proposed for modeling lake water balance and water salinity based on geographic analogy and an algorithm for constructing a stochastic vector autoregression process. Realizations of the simulated series of lake water balance components and water salinity variations over 1000 years with a monthly step are constructed.     

Effect of Long-Term Variations in Wind Regime over Caspian Sea Region on the Evolution of Its Level in 1948–2017

Water Resources - The data of atmospheric reanalysis NCEP/NCAR over 1948–2017 (R-1) and NCEP/DOE over 1979–2017 (R-2) have been used to show that variations of the Caspian Sea level are...     

Assessing the Effect of the Stochastic Structure of Inflow into Lake Baikal on the Long-Term Level Regime of the Lake

Water Resources - The statistical homogeneity of the total inflow into Lake Baikal have been analyzed. The periods of 1901–1933 and 1933–2014 have been found not only to show...     

Dynamic-stochastical modeling of long-term fluctuations in Lake Baykal levels and Angara River runoff

The results of modeling of the long-term fluctuations in Lake Baikal levels and Angara River runoff are presented. The dynamic-stochastical model was developed and used to obtain analytical relationships between the statistic characteristics of the Baikal levels fluctuations and the parameters of forcing processes, including water inflow into the lake and the effective evaporation from its surface. The parameter λ determining the inertia of the Baikal levels fluctuations, decreased by about three times after Irkutsk Reservoir filling, resulting in an increase in the variance of the lake levels fluctuations. The dependence of variances of the Baikal levels fluctuations and Angara runoff on parameter λ was studied. It is shown that the decreasing in the variance of the Baikal levels fluctuations corresponds to increasing in the variance of Angara river runoff and vice versa. The results of numerical modeling of Baikal levels fluctuations show that water withdrawal from inflow into the lake has an adverse effect on Angara runoff regime.     

Probabilistic Regularities in Setup Variations in the Level of a Large Inland Water Body: Case Study of the Caspian Sea

The results of probabilistic analysis of data on setup level variations collected during long-term observations at all gages along the Caspian Sea coast are discussed. A procedure for evaluating low-probability sea level extremes is proposed. Estimates are given for the probabilities of outstanding setups in the Caspian Sea and the Sea of Azov.