Home – Home – Jornals – Geography and Natural Resources 2021 number 1

Temperature characteristics of the atmospheric air and soil are among the main indicators that determine the meteorological conditions of the selected period. However, they include not only the actual temperature of the air and soil, but also meteorological parameters, such as the beginning of seasonal freezing and thawing of the soil and the depth of soil freezing, which, in turn, depends considerably on the period of snowmelt. Several issues have been dealt with to assess the thermal conditions for the occurrence of spring and early-summer floods on the Iya and Uda rivers in 2019. We examined the long-term thermal regime of the atmosphere and soil by using data from weather stations Tulun, Nizhneudinsk and Alygdzher. The long-term dynamics of thermal indicates is shown, trends in their changes are calculated, as well as analyzing the characteristics of the thermal regimes in May-June of 2019 prior to the flood. It was found that in the valleys of the Iya and Uda rivers there is a high consistency of thermal regimes of the air and soil. Over the last 30-year period, the recorded positive (especially negative) air temperature anomalies in May and July were not extremely high, capable of influencing physical and geographical processes, including the water regime of rivers. The air and soil temperatures in May-July 2019 were close to the average long-term values and did not have a significant impact on the strength and duration of the abnormal flood. An indirect effect could have been caused by soil overexposure due to the past heavy rainfall of the second decade of June, because the presence of a “zero curtain” in the soil column prevents the passage of moisture deeper than 80 cm.