Characteristics of unfavorable levels relative to critical values as observed at stationary posts in the Ob and Taz bays

• Main Authors: A. A. Piskun, А. А. Пискун
• Other Authors: The research was funded within project 2.2 of Roshydromet Plan NITR 2022–2023, Исследование выполнено в рамках темы 2.2 Плана НИТР Росгидромета на 2022–2023 гг.
• Format: Article in Journal/Newspaper
• Language: Russian
• Published: Государственный научный центр Российской Федерации Арктический и антарктический научно-исследовательский институт 2024
• Subjects: экстремальные уровни; extreme levels; homogeneous series; hydrological yearbooks; statistical characteristics; критические отметки; однородные ряды; статистические характеристики; Arctic; Kara Sea
• Online Access: https://www.aaresearch.science/jour/article/view/608; https://doi.org/10.30758/0555-2648-2024-70-2-144-160

Water levels exceeding critical values pose a danger to economic facilities located in the adjacent territory. The aim of the work is to obtain, using the materials of the Water Cadastre, the most general characteristics of unfavorable water levels relative to the critical values established by the decision of the UGMS, based on observations at stationary posts in the Ob and Taz Bays. These posts include New Port, Cape Kamenny, Tadibeyakha, Seyakha, Tambey, 60 Let VLKSM, Antipayuta. No generalizations on this issue are found in the research literature for the area under consideration. Sources of initial data are hydrological yearbooks for the Kara Sea basin for the period 1953–2019. The generated series of levels for each post are brought to a single reference plane for the observation period. The length of the rows ranges from 14 to 61 values. As a result of data analysis, the following characteristics of unfavorable levels were obtained: the proportion of years with extreme levels above the critical level during surges and floods and below the critical levels during surges; distribution by month of the largest exceedances of levels above and below the critical ones during the year; the maximum values of exceedances and duration of levels above and below the critical ones; repeatability of values of extreme annual elevations/decreases in level relative to the critical ones at given intervals; information on the maximum number and duration of repeated cases of unfavorable levels at the post per year and the total duration for the entire period. It has been established that among the posts that have a series of observations of levels over 20 years, the most unfavorable conditions in terms of levels are formed for the Tadibeyakha and Antipayuta posts in all indicators. The results obtained can be used in risk assessment depending on the high- altitude location of a structure being designed. They take into account the possible adverse effects of extreme levels on these structures. Уровни воды, выходящие за ...