ANALYSIS OF THE ANNUAL VARIATION IN WATER TEMPERATURE IN THE RIVER ISHIM WITHIN THE AREA OF THE TOWN OF ISHIM

Abstract

We study the annual variation in water temperature in the river Ishim within the area of the town of Ishim. Temporary changes in water temperature in the river Ishim are tracked within each year of observation and compared with the average long-term observations. In general, annual water temperature variations in the studied period are similar in smooth changes and patterns characterized by an annual spring-summer temperature rise, a summer temperature maximum and an autumn temperature decrease. The maximum annual variation in water temperature in the river Ishim is registered, as a rule, in the second half of July. The dynamics of water temperature being observed shows periods of threshold temperatures (important in the fields of economy and human life) which vary in their duration. Intramonth differences are usually not significant, except for April-May and October-November, when we observed warming or cooling of the water.