ASSESSMENT OF THE LEVELS OF GENERAL TOXIC RISK TO THE HEALTH OF THE POPULATION OF UDMURTIA FROM THE CONSUMPTION OF DRINKING WATER FROM UNDERGROUND SOURCES WITH A HIGH CONTENT OF IRON, BORON AND FLUORINE

ASSESSMENT OF THE LEVELS OF GENERAL TOXIC RISK TO THE HEALTH OF THE POPULATION OF UDMURTIA FROM THE CONSUMPTION OF DRINKING WATER FROM UNDERGROUND SOURCES WITH A HIGH CONTENT OF IRON, BORON AND FLUORINE

DISTRIBUTION OF TEMPERATURE INDICES OF EXTREME IN THE TERRITORY OF THE EUROPEAN PART OF RUSSIA IN THE PERIOD 1980-2019

The spatio-temporal variability of the average values of temperature indices of climate extremity in the territory of the European part of Russia (ER) in 1980-2019 is presented. To calculate the extremeness indices, we used hourly data on the maximum and minimum temperatures obtained using the ERA5 reanalysis on a 1°´1° spatial grid. Statistical processing of the index values revealed an increase in the temperature indices TNX, TNN, TXN, TXX, associated with the minimum and maximum temperatures, with the exception of the north and southeast of the region. An increase in the number of sunny days and a decrease in the number of frosty days were also revealed.

DISTRIBUTION OF RESTORATION SUCCESSIONS IN TAIGA AND FOREST-STEPPE LANDSCAPES OF THE PERMSKY PRIKAMYE (ON THE EXAMPLE OF AGRICULTURAL LANDS)

The research of forest cover development on agricultural lands in the Perm Prikamye was carried the example of taiga and forest-steppe types of landscapes. The Babkinsko-Yugovskoy and Irensko-Kungursky landscapes were select for research. Received information about the geosystem condition in different years using remote sensing data. All landscape changes were record during the formed stable snow cover. As a result, was divide into two classes - forested and treeless areas. Established, the main natural factors of land differentiation by an areas and a pace of withdrawal from agricultural use are the small contours of agricultural land and differences in soil fertility. The growth pace of forest geosystems within the forest-steppe landscape was 2.5 times higher than of the taiga. The research of the dynamics of forest cover showed that in the Perm Prikamye in the forest-steppe landscape substitution of anthropogenic geosystems with natural-anthropogenic ("wild") accompanied by the development of forest biogeocenosis, not steppe.

COMPARATIVE ANALYSIS OF THE CHEMICAL COMPOSITION OF WATERWATER IN THE SLAVSKY DISTRICT OF THE KALININGRAD REGION BY HYDROLOGICAL SEASONS

The aim of the work is to research the chemical composition of surface watercourses in the Slavsky district of the Kaliningrad region in the winter hydrological season, and to compare the results with the data previously obtained by the authors for the autumn hydrological season and partly for the summer hydrological season. Watercourses and monitoring points for research have been identified: r. Zlaya, r. Shluzovaya, r. Nemoninka and r. Osa. In the winter season, water samples were taken, hydrometric characteristics were measured, and primary hydrochemical indicators were determined. On the basis of the obtained hydrochemical data, integral indicators were calculated to assess the quality of water, using combined lists of maximum permissible concentrations of pollutants. When monitoring hydrochemical indicators, it was revealed that the studied watercourses are, to one degree or another, subject to pollution. The water quality class in them varies from "moderately polluted" to "extremely dirty". When comparing the seasons, a tendency was revealed to improve the quality of water, which is associated with the water content of rivers, as well as with the cycles of natural and anthropogenic activity. The work has theoretical and practical significance. The data can participate in the planning of rational use of natural resources and the selection of measures to improve the geoecological state of the river network of the Slavsky region. The research can serve as a supplement to the formation of the general geoecological picture of the Kaliningrad region.

BIVALVE MOLLUSCS (BIVALVIA: UNIONIDAE, DREISSENIDAE, SPHAERIIDAE) OF UDMURTIA

The results of the studies of fauna of bivalve molluscs of Udmurt Republic are summarized. The annotated check-list of species of bivalve molluscs of the waterbodies of Udmurtiya is presented. After examination of own collections and critical assessment of published data, 26 species of bivalves from 74 localities (14 rivers, 2 reservoirs, 8 pounds and 2 oxbow lakes) have been included into the final list. In studied region 11 species of bivalves are recorded for the first time. From the zoogeographical point of view most species belong to the European-Siberian faunistic group (46 %), also a considerable part of fauna are European species (26,9% of overall species composition), which are located in the region at the Eastern border of the range.

ASSESSMENT OF THE CURRENT STATE AND EXPECTED CHANGES IN AGRO-CLIMATIC RESOURCES OF THE GUBA-KHACHMAZ ECONOMIC REGION OF THE REPUBLIC OF AZERBAIJAN

The article discusses some issues of assessing the current state and expected changes in agro-climatic resources of the Guba-Khachmaz economic region. Research methods are selected and substantiated. The issues of interpretation of agro-climatic information are considered to determine modern "norms" of agro-climatic indicators and assess the impact of regional climate change on these resources. To assess the impact of climate change on agroclimatic resources, such indicators as the date of the transition of the average daily air temperature above 10 °C in the spring and below 10 °C in the fall, the length of the warm period, the sum of active air temperatures above 10 °C, the sum of precipitation and the hydrothermal coefficient Selyaninov for the warm season. For example, it is shown that with the expected increase in air temperature by 2 °C, the beginning of the warm period will begin in the lowland, foothill and mid-mountain zones by 8-10 days, and in the highlands by 22 days earlier than in the modern period. In autumn, the end of the warm period is expected 11-15 days later; the length of the warm period is expected to increase by 20-23 days in the lowland, foothill and mid-mountain zones and by 37 days in the high-mountain zone. It is also expected that the sum of active temperatures will increase by 581-665 °C for the warm period. It was revealed that the most susceptible to the influence of an increase in global air temperature by 2 °C will be medium and high mountain zones. With an increase in air temperature in the future by 4 °C and a decrease in atmospheric precipitation by 20 %, the frequency of occurrence of the 1st group of drought with height will increase from 6 % to 33 %, the frequency of occurrence of the 2-nd group will change from -14 % to + 50 %, and the first group will decrease by 13-57 %. With an increase in air temperature in the future by 2 °C and a decrease in atmospheric precipitation by 20 %, the frequency of occurrence of various groups of drought will be similar to the previous variant. Also, an assessment was made of possible changes in the frequency of drought with different intensities.

APPLICATION OF AERIAL PHOTOGRAPHY RESULTS, OBTAINED USING UAV DATA TO ESTIMATE THE RESIDUAL CAPACITY OF THE LANDFILL. PRACTICE OF THE REPUBLIC OF TATARSTAN

Assessment of the current residual capacity is a fundamentally important task, the solution of which is demonstrated on a landfill located in the Republic of Tatarstan. To solve the task, the modern methods of high-precision three-dimensional reconstruction were used based on the survey from an unmanned aircraft DJI Phantom 4, equipped with a global satellite navigation system (GNSS) receiver. As a result of combining the project data and data from field surveys into one coordinate system and elevations and reconstruction of designed underground and ground parts of landfill calculation, the difference of models and the residual capacity of the landfill becomes possible. Based on the materials considered as of July 2020, the residual capacity of the studied landfill is 41.2 % of the project capacity, which allows us to continue to operate this landfill. The proposed approach allows for rapid and high-quality active monitoring of the engineered facility. Photogrammetric processing of the results of low-altitude aerial photography makes it possible to obtain objective data on the current actual state of the landfills, to carry out competent and valid management of the landfill functioning. Significant, this will extend the landfill's lifetime, minimize the adverse effects on the environment and predict the yield to the project capacity much more accurately.

CLIMATIC CHARACTERISTICS OF THE COLD PERIOD IN UFA

The article presents the results of a study of the climatic characteristics of the cold period in the city of Ufa of the Republic of Bashkortostan in the modern period. For the analysis, the authors used traditional processing methods. To identify climate changes, different base periods were considered (1961-1990, 1981-2010, 1991-2020). In some cases, time series of long-term observations were available only since 1973, so in these cases two base periods were distinguished. The statistical characteristics and changes in air temperature and its amplitude, the dates of the beginning/end and duration of the cold period, the amount of precipitation, relative humidity, the height of the snow cover and its moisture reserves, the dates of establishment/destruction and the duration of the snow cover are analyzed. Correlations between climatic indicators are shown. The study revealed that in all months of the cold period there is a tendency to increase air temperature, while the greatest contribution is made by an increase in minimum temperatures. A steady reduction in the duration of the cold period was found due to the shift of the start date to a later date, and the end date to an earlier one. The amount of precipitation tends to increase. Due to the reduction of the cold period, the duration of the snow cover in the city of Ufa decreases.

DEPENDENCE OF SPRING WHEAT YIELD ON HYDROTHERMIC CONDITIONS IN THE SARATOV REGION

Using long-term stationary field studies on the phases of development of spring wheat, a prognostic equation for calculating the yield of a given crop depending on the duration of the growing season with a monthly lead time was derived. Taking into account the hydrothermic factors of the Saratov region, the prognostic equation of the multiple function of the yield of spring wheat from the amount of precipitation for April-May, the average air temperature in May, the amount of precipitation in June, the amount of precipitation in July, and the duration of the growing season was calculated.