|
ИСТИНА |
Войти в систему Регистрация |
Интеллектуальная Система Тематического Исследования НАукометрических данных |
||
Hydrological regime of the Lower Ob River under modern conditionтезисы доклада Тезисы
- Авторы: Agafonova S., Magritsky D., Banshchikova L.
- Сборник: Abstracts of the 4th Int. Conf. on the Status and Future of the World’s Large Rivers
- Тезисы
- Год издания: 2021
- Место издания: Moscow, Russia
- Первая страница: 249
- Последняя страница: 249
- Аннотация: The Ob is the main river of Western Siberia, one of the most dynamically developing regions of Russia. Among the various factors of the economic development of this region a special place is occupied by river flow. Changes in the flow of water, sediments, and heat determine the hydrological regime of the Ob Bay and the southern part of the Kara Sea. A detailed analysis of the hydrological observations allowed us to highlight the observed changes in the hydrological regime. The periods before 1975 and after were compared.The water regime of the lower reaches of the Ob River is characterized by a spring-summer flood, a short full-flowing autumn period and a stable winter low-flow period. The average annual water flow to the Ob Bay is 411 km3/year. Most of the annual sediment runoff (85%) takes place between May and August. The average duration of the positive water temperatures period is 153 days. The appearance of ice is observed on average on October 20-25. By the end of the ice-cover period, the ice thickness reaches 80-100 cm. Spring ice runs were observed in the second decade of May, and its duration is 3-5 days.The current change in the hydrological regime of the Lower Ob River is the result of climatic and anthropogenic factors. The change in the seasonal runoff after 1975 is expressed in a significant decrease in spring-summer flood runoff and an increase in winter runoff. Change in the thermal regime is manifested in the increase in water temperature for May-July from the beginning of the 2000s. The reduction in the duration of the ice-cover period is observed and occurs primarily due to the shift in the timing of the appearance of ice and breakup.
- Добавил в систему: Магрицкий Дмитрий Владимирович