| Article |
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| Article name |
Assessing the long-term сhanges in runoff parameters of the Ushakovka River |
| Authors |
Sutyrina E.. candidate of geographical sciences, Tsarenkova D.. postgraduate, tsarenkova.diana@yandex.ru |
| Bibliographic description |
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| Category |
Earth science |
| DOI |
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| DOI |
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| Article type |
Scientific |
| Annotation |
The purpose of the study is to identify current trends in the discharge parameters of the Ushakovka River and several draining climate factors, such as precipitation and air temperature.
By analysis of hydrometric network data, the negative linear trends in the average annual runoff values of the Ushakovka River with a level of statistical certainty of about 90 % was assessed, that amounted to minus 0,095 and minus 0,153 m³/s per decade at the stations of the village of Dobrolet and Irkutsk City, respectively. Significant changes in the water discharge of the Ushakovka River were established, that expressed in a decrease in average annual runoff from 1938 to 2016 by 31 and 24 % at the stations of the village of Dobrolet and Irkutsk City, respectively.
By the use of NCEP/NCAR (The National Centers for Environmental Prediction / The National Center for Atmospheric Research) reanalysis data, it was showed that precipitation, determining the incoming part of the water balance of the river catchment, did not undergo noticeably changes from 1948 to 2016, and statistically significant trends in precipitation were not observed in this period. The increase in the expenditure part of the water balance could be affected by the growth of surface air temperature within the catchment area of the river, which was observed from 1970 to 2016 and leaded to an increase in potential evaporation and a corresponding reduction in water runoff. The positive trend of surface air temperature in 1970–2016 was 0,48 °C per decade with a level of statistical certainty of more than 99.99 %.
Analysis of the intra-annual distribution of the average monthly water discharge of the Ushakovka River at Irkutsk City station in 2000–2016 compared with the distribution in 1938–1955 showed a runoff decrease from April to November. The most noticeable reduction in absolute runoff value in 2000–2016 observed in June and July, reached 3,92 and 5.57 m³/s, respectively, and could be associated with water withdrawal for irrigation purposes
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| Key words |
Ushakovka River; water discharge; annual distribution of runoff; analogue river; drainage factors; NCEP / NCAR reanalysis data; climate change; air temperature; precipitation; trend |
| Article information |
Sutyrina E., Tsarenkova D. Assessing the long-term сhanges in runoff parameters of the Ushakovka River // Transbaikal State University Journal, 2019, vol. 25, no. 10, pp. 24–30. DOI: 10.21209/2227-9245-2019-25-10-24-30. |
| References |
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