IDENTIFICATION AND QUANTIFICATION OF GEOGRAPHICAL WATER SOURCES IN A SWAMP CATCHMENT IN THE ZAPADNAYA DVINA RIVER BASIN

• Main Authors: Tatiana S. Gubareva, Boris I. Gartsman, Ludmila E. Efimova, Pavel N. Tersky, Pelagia A. Belyakova, Alena A. Kazachuk
• Format: Article in Journal/Newspaper
• Language: Russian
• Published: Для почтовых отправлений: 199155 Санкт-Петербург, а/я 136, Редакция журнала «Гидросфера. Опасные процессы и явления» / For mail: 199155 St. Petersburg, PO Box 136 Editorial Board of the «Hydrosphere. Hazardous processes and phenomena». 2023
• Subjects: geographical water sources; EMMA-model; principal component analysis; chemical tracers; water of swamp deposits; catchment; hydrochemical observations; источники питания; ЕММА-модель; метод главных компонент; химические трассеры; воды болотных отложений; гидрохимические наблюдения; dvina
• Online Access: https://hydro-sphere.ru/index.php/hydrosphere/article/view/158; https://doi.org/10.34753/HS.2022.4.2.183

Using the mixing model (EMMA) and hydrological and hydrochemical data, the geographical water sources for the Velesa river were identified and their quantitative assessment was made. They are: valdai super-moraine aquatic and lake-glacial aquifer water, swamp water, atmospheric precipitation water. EMMA-model results demonstrate the seasonal dynamics features of water sources in the period May 2017 – June 2018. Water of the super-moraine and lake-glacier aquifer are significant river runoff component constantly operating during year. Its proportion during the spring flood of 2018 is about 20%; its proportion in the periods following the spring flood is higher – in 2017 – 31%, in 2018 – 38%. Significant proportion of atmospheric precipitation waters is observed in the winter period of 2017 – up to 30%, it is due to excessive humidity of the catchment as a result of abnormal liquid precipitation and non-typical meteorological conditions in the first half winter period of 2017. The maximum proportion of atmospheric water (up to 60%) is occur during warm periods after a spring floods in 2017 and 2018. Antecedent watershed moistening and precipitation during the survey periods were the main reasons for the high proportion value. Atmospheric precipitation coming as a result of infiltration into the vadoze zone without significant transformation of their chemical composition (temporary perched water) is discharged into the river by a subsurface flow path. Swamp water is prevailed in river water during the spring flood – 46%, its proportion is also high during the winter period – up to 35%, and in early summer periods – decline to zero. Детальные исследования источников питания и механизмов формирования речного стока стали возможными в последние десятилетия благодаря развитию инструментария гидролого-гидро­гео­хими­ческого анализа. С использованием трассерной модели смешения (ЕММА) и данных гидролого-гидрохимических съемок уточнены источники питания реки Велеса в бассейне реки Западная Двина и выполнена их оценка. ...