Smakhtin V.K. - Role Potential of Evaporation in River Flow Formation During the Warm Season in Transbaikalie

Written by Erkin Turdibaev

Thursday, 29 June 2017

Climate changes are happening globally and throughout Russia which influence on the hydrological regime of the rivers of Transbaikalie. Here the flow of rivers in the summer is strongly influenced by precipitation. Important factors in the formation of runoff are also evaporation and potential evaporation. Increasing of the average temperature could occur through a change in potential evaporation and affect on the flow during the warm season, which had led to this analysis. The bases of this study are the materials of standard meteorological observations at a fixed observation network of Transbaikal Department on Hydrometeorology and Environmental Monitoring. The data on temperature and relative humidity to calculate the potential evaporation were taken from 1951 to 2010.We used the methods of statistical analysis.  Trends were calculated by the method of least squares. Consistency changes studied characteristics were assessed by the use of correlation analysis. Cyclicity was detected by constructing integral-difference curves, and with the help of spectral and wavelet analysis. To assess the significance of the spectral density calculated from the sample data, the criterion c-square was used. Assessment of trends and correlation coefficients significance was performed by using Student’s statistic at the 5 % significance level. Spectral analysis in this article was carried out by using the software package «Statistica». For continuous wavelet transform Morlet wavelet was used. The analysis was performed by using the software package «Matlab».The conclusions that the long-term fluctuations are characterized by cyclical potential evaporation and have poor correlation within the basin are made. Trends in long-term changes in the potential evaporation of the Transbaikal region are positive and significant. Potential evaporation affects the formation of river flow during the warm season (May-September) Download (in Russian) (pdf, 605 kB)  Source: http://cyberleninka.ru/

 

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