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Abstract <p>The characteristics of the Onega River flow regime and its elements at the top of the mouth area over 80 years are presented. The analysis of the long-term and seasonal runoff variability is carried out, the characteristic of the intra-annual distribution were given. Statistical processing of long-term series of maximum discharges of spring floods and rain floods, minimum low-water discharges of the summer-autumn and winter periods was carried out. Patterns of long-term fluctuations of the annual and seasonal runoff and extreme water discharges have been revealed. The analysis of changes in runoff elements was based on identifying general long-term trends and comparing calculated parameters by periods, identified using difference-integral curves and chronological graphs. The features of fluctuations in Onega River flow, related with climate change started in the 1980-s are noted. Particular attention was paid to the water flow regime in the 21st century.</p>

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Characteristics of Long-Term and Seasonal Runoff Variability at the Head of the Mouth Area of the Onega River

  • 期刊论文

  • 发表日期：

    2025年2月1日

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  • A. A. Sapozhnikova,
  • O. V. Gorelits

摘要

Abstract

The characteristics of the Onega River flow regime and its elements at the top of the mouth area over 80 years are presented. The analysis of the long-term and seasonal runoff variability is carried out, the characteristic of the intra-annual distribution were given. Statistical processing of long-term series of maximum discharges of spring floods and rain floods, minimum low-water discharges of the summer-autumn and winter periods was carried out. Patterns of long-term fluctuations of the annual and seasonal runoff and extreme water discharges have been revealed. The analysis of changes in runoff elements was based on identifying general long-term trends and comparing calculated parameters by periods, identified using difference-integral curves and chronological graphs. The features of fluctuations in Onega River flow, related with climate change started in the 1980-s are noted. Particular attention was paid to the water flow regime in the 21st century.