Long-term Changes of Water Flow, Water Temperature and Heat Flux of the Largest Siberian Rivers

Water Flow Changes In The Don River (European Russia) During 1891–2019

“…Hydrological regime shift (change) point detection for annual and seasonal water flow. The time boundaries between individual long phases of increased and decreased values of annual and seasonal water flow were determined using normalized cumulative deviation curves (Andreyanov 1959;Georgiadi et al 2018) in combination with the statistical homogeneity of the average values of the series using the Student t-test (Stepanek 2008;Lemeshko et al 2018) and Mann-Whitney-Pettitt (MWP) test (Pettitt 1979) in the AnClim software for analysis time series. The estimates of the shift points of the contrasting phases, determined by different methods, mostly coincided with the conclusions made earlier for Russian rivers (Georgiadi et al 2018).…”

“…Studies relating to long-term changes in river water flow and other components of environmental flow which are regarded to be particularly susceptible to ongoing climate change, are given a great deal of attention due to current global warming began in the 1970s and 1980s (Hinzmann et al 2005;Water Resources … 2008;Shiklomanov et al 2013;Georgiadi et al 2014;Magritsky 2015;Georgiadi et al 2018;Shiklomanov et al 2020;Scientific and applied reference … 2021;Georgiadi and Groisman 2022;Frolova et al 2022;Zhuravlev et al 2022). A large number of scientific publications is devoted to the evaluation of changes that happened in various hydrological characteristics during the global warming period compared to the relatively cooler baseline period (Shiklomanov and Georgievskii 2007;Water Resources … 2008;Georgiadi et al 2019).…”

“…It should be noted that the deviation of values between such phases is considered statistically significant. The duration of these contrasting periods ranges from 10-15 years up to several decades (Georgiadi et al 2014;Georgiadi et al 2018;Georgiadi et al 2019). In this regard, annual and seasonal changes in water flow in various regions of the world have recently been studied (Sharma and Singh 2017;Bolgov et al 2018;Georgiadi et al 2018;Shi 2019;Georgiadi et al 2020).…”

“…The duration of these contrasting periods ranges from 10-15 years up to several decades (Georgiadi et al 2014;Georgiadi et al 2018;Georgiadi et al 2019). In this regard, annual and seasonal changes in water flow in various regions of the world have recently been studied (Sharma and Singh 2017;Bolgov et al 2018;Georgiadi et al 2018;Shi 2019;Georgiadi et al 2020). However, despite a rather wide range of studies on long-term phases of increased/decreased river water flow for various regions of the world, specifically for Russia's river basins, the spatial range of such studies still awaits significant enhancement.…”

Variation of heat flux and ecological impact on fish reproduction in the middle reaches of Yangtze River

“…That is, the summer flow falls and the annual proportion of HF rises, whereas the winter flow falls and the annual proportion of HF rises 12 . Georgiadi et al studied the HF variability of the Yenisei River, one of the largest rivers in Siberia, over the past two decades 13 . They discovered that anthropogenic factors (primarily related to the operation of the reservoir system) caused a 12% decrease in the average long-term HF of the Yenisei River over the entire observation period.…”