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oa Climate Change Impact on Seasonality of Flood in the Desna River Catchment, North Ukraine
- Publisher: European Association of Geoscientists & Engineers
- Source: Conference Proceedings, 16th International Conference Monitoring of Geological Processes and Ecological Condition of the Environment, Nov 2022, Volume 2022, p.1 - 5
Abstract
The modern climate of Ukraine is characterized by asymmetric warming (more significant in the north than in the south), expressed in the winter and summer months. This may affect the seasonality of the flood. The time of flooding or its seasonality is an excellent indicator for studying the processes of flood formation under climate change conditions. The results of this study show that frequency of winter floods in the Desna river catchment, located in the north of Ukraine, is increase and frequency of spring floods is decrease. It is the result of changes in the current climatic regime in the North of Ukraine. In the second period of observations (1998–2015) the process of flood formation began almost two weeks earlier than in the first (1960–1987). The most probable moment of the peak of the flood according to the frequency distribution curves of the annual maximal floods in the second period shifted significantly relative to the first period and occurred earlier by 7 days. The value of the density distribution of Q max annual dates in the spring flood peak area decreased significantly. Since 1988, the dates of the beginning of spring floods have shifted to earlier dates (February–March), which indicates warmer winters with thaws, which leads to a decrease in water reserves in the snow and, consequently, the early beginning of spring floods.