Effect of regional climate variations and economic activity on changes in the hydrological regime of watersheds and small-river runoff

Regularities of long-term within-year and between-zone variations in climate characteristics (air temperature and precipitation) were identified, and estimates were obtained for the response time of the factors of hydrothermal state of watersheds at the beginning of snow-melting (maximal snow storage, freezing depth, and soil moisture content), spring surface slope runoff, annual and spring river runoff of small rivers in different natural zones of Russian Plain.     

Erratum to: Contemporary and Scenario Changes in River Runoff in the Don Basin

Water Resources - An Erratum to this paper has been published: https://doi.org/10.1134/S0097807821120010     

Numerical simulation for polycondensation of orthosilicic acid in hydrothermal solutions

This paper describes numerical simulation of the polycondensation of orthosilicic acid in geothermal solutions under a variety of physical and chemical conditions, including temperature, pH, mineral content, and ionic strength. We obtained the concentrations of silica, oversaturation of the solution as a function of time, and the distribution of silica particles over size. It was found that the nucleation of orthosilicic acid and the origination of colloidal particles occurred at temperatures below 100–120°C. The relationships obtained here can be used for the technology of extracting silica from solutions with a prescribed particle size.     

Specific Features of the Formation of Water Flow and Pollution Export from Agricultural,Forest, and Urbanized Landscapes

Water Resources - The overland flow from different landscapes during flood season and its variations under the effect of agrotechnical activities and climate in the southern Russian Plain have been...     

Contribution of Climatic and Anthropogenic Factors to Changes in the Flow of Large Rivers of the Russian Plain and Siberia

Doklady Earth Sciences - Changes in the annual and seasonal flow of the Volga, Don, Yenisei, and Lena rivers were estimated by two independent methods. One of them is based on the data of water...     

Impact of changes in the conditions of European Russia forests on annual river runoff

Based on the methods of O.I. Krestovskii and recent information on the forestry of European Russia, the article offers the assessment of the impact of transformations in the structure of forests in the recent decades on the river runoff and evaporation. The accompanying changes in the runoff are shown to be relatively insignificant; however, in the XXI century they may become more significant and manifest themselves not only at the local but also at the regional level.