Impact of global climate change on the surface runoff of the Chatkal River
Аннотация
Abstract Charvak reservoir is the largest reservoir in Uzbekistan. It is surrounded by the Tien Shan Mountains. The Chatkal River begins from the western part of The Tien Shan Mountains and flows into the Charvak reservoir. The average annual water discharge is 108 m 3 /s and is the largest right tributary of The Chirchik River. Based on long-term observational data, intraannual flow distribution was calculated. And trends were determined, tests for homogeneity were carried out, differential-integral curves in the observation series were evaluated. Average flow rates the error does not exceed 10%, for the coefficient of variation; the error does not exceed 15%. 4. Analysis of the difference integral curve showed since the 90s of the last century to the present time, a high water period has been observed on The Chatkal River and its tributaries. This is mainly due to the increase in annual precipitation. There is no significant change in long-term annual precipitation. However, shift happening with the type of precipitation. Namely, in the last two decades more rainy days than cold snowy days were observed.