The Exxon Valdez oil spill emergency has shown that simulation of oil spills trajectory is the main action in planning response measures. Modeling the trajectory of the oil slick allows predicting in advance the direction of the motion of the stain, the time it will take to reach the shore and assess the possible environmental consequences for the contaminated coastal zone. In this paper, the Exxon Valdez oil spill trajectory was analyzed using two different models, the GNOME model and the HAZAT trajectory model. Conclusions are drawn about the reasons for the differences in the results provided by the two models. The accuracy of the simulation is strongly related to the input of geographic and meteorological data. In addition, ADIOS software was used to predict the weathering process of the modeled emergency event. It was found that the main factors influencing the change in the physical and chemical characteristics of oil dispersed in the water body are the wind speed and direction, water temperature and wave height.

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Nowadays, the problem of climate change receives a wide resonance throughout the world. According to meteorological observations in Bashkortostan over the past 30 years, annual precipitation has increased. The occurrence of natural hazards is directly related to climate change, the number of which has been steadily increasing in recent years. If in the period from 1998 till 2005, their number in Bashkiria ranged from 5 to 11, then in 2010 it was recordedas 37, and as 34 in 2016. In this article, the object of study is the Republic of Bashkortostan, its territory is 142, 947 km2. Available data consists of annual time series of precipitation for 34 stations, they were analyzed to identify potential trends and their significance. As a first step, precipitation data was checked to assess the quality of the data, to find potential points of change in the time series. For this purpose, parametric (The Student’s t -test) and non-parametric (Pettitt’s test) statistical criteria were applied. Then, a statistical test was used to determine the significance of linear trends (the Mann-Kendall trend test and the Sen’s test). Thus, the main purposes of the article are to detect points of change, as well as, to check, with a help of parametric and non-parametric tests, annual trends for precipitation data.

Do you need clean water in your city? At last time, the quality of urban water bodies does not correspond to normative requirements. The government could not control state of all urban water bodies. Mainly, this is related with financial costs. In the study, the method of geoenvironmental assessment of water bodies is proposed. It is differ from others by including four stages (study of anthropogenic factors, morphometric study, hydrochemical and hydrobiological analysis). And most importantly, hydrochemical analysis including few main parameters, which were divided by priority. Meanwhile, each of this parameter can be easily analyzed on-site and do not need expensive laboratory equipment. The proposed method of geoenvironmental assessment considered by the example of pond Teploe (Ufa city, Russia).