Changes in the discharge regime of Finnish rivers
Lintunen, Karoliina ; Kasvi, Elina ; Uvo, Cintia B. LU
and Alho, Petteri
(2024)
In Journal of Hydrology: Regional Studies
53.
- Abstract
Study region: Finland divided into three subregions, each representing different environmental conditions. Study focus: This study investigates long-term changes in unregulated river discharge. Trends in high- and low-flow event volumes, magnitudes, timings, and frequencies are analysed across 36 gauging stations in 19 watershed areas from 1911 to 2021. The average measurement period for discharge in the stations is 60 years, with over 765,000 daily records examined statistically. New hydrological insights for the region: High-flow events show advancing timings and decreasing magnitudes, notably in the coastal region and less so in the north. These events, occurring from 6 to 68 days earlier in 21 stations, now in the late winter and... (More)
Study region: Finland divided into three subregions, each representing different environmental conditions. Study focus: This study investigates long-term changes in unregulated river discharge. Trends in high- and low-flow event volumes, magnitudes, timings, and frequencies are analysed across 36 gauging stations in 19 watershed areas from 1911 to 2021. The average measurement period for discharge in the stations is 60 years, with over 765,000 daily records examined statistically. New hydrological insights for the region: High-flow events show advancing timings and decreasing magnitudes, notably in the coastal region and less so in the north. These events, occurring from 6 to 68 days earlier in 21 stations, now in the late winter and early spring, align with increasing spring low-flow volumes. On a monthly scale, a trend of rising volume magnitude is observed in late autumn, winter, and early spring, especially in Northern Finland's rivers. High flows during autumn and winter occur 30 to 60 days later in 8 stations. Changes in the monthly mean volumes were found in 30 stations, suggesting a redistribution of annual volumes across a broader time period, while the overall annual volumes have remained relatively unchanged. This underscores the complexity of hydrological patterns, emphasizing the need to consider total volumes and their temporal distribution in analyses. The findings enhance understanding of current changes and align with findings in the boreal-subarctic area.
(Less)
- author
- Lintunen, Karoliina
; Kasvi, Elina
; Uvo, Cintia B.
LU
and Alho, Petteri
- organization
- publishing date
- 2024-06
- type
- Contribution to journal
- publication status
- published
- subject
- keywords
- Discharge, Finnish rivers, Time series analysis, Trends
- in
- Journal of Hydrology: Regional Studies
- volume
- 53
- article number
- 101749
- pages
- 23 pages
- publisher
- Elsevier
- external identifiers
-
- scopus:85188676676
- ISSN
- 2214-5818
- DOI
- 10.1016/j.ejrh.2024.101749
- language
- English
- LU publication?
- yes
- additional info
- Publisher Copyright: © 2024 The Authors
- id
- f087380f-36c5-40e2-80f1-3e634bbf62c8
- date added to LUP
- 2024-04-19 17:21:04
- date last changed
- 2024-04-22 10:07:01
@article{f087380f-36c5-40e2-80f1-3e634bbf62c8,
abstract = {{<p>Study region: Finland divided into three subregions, each representing different environmental conditions. Study focus: This study investigates long-term changes in unregulated river discharge. Trends in high- and low-flow event volumes, magnitudes, timings, and frequencies are analysed across 36 gauging stations in 19 watershed areas from 1911 to 2021. The average measurement period for discharge in the stations is 60 years, with over 765,000 daily records examined statistically. New hydrological insights for the region: High-flow events show advancing timings and decreasing magnitudes, notably in the coastal region and less so in the north. These events, occurring from 6 to 68 days earlier in 21 stations, now in the late winter and early spring, align with increasing spring low-flow volumes. On a monthly scale, a trend of rising volume magnitude is observed in late autumn, winter, and early spring, especially in Northern Finland's rivers. High flows during autumn and winter occur 30 to 60 days later in 8 stations. Changes in the monthly mean volumes were found in 30 stations, suggesting a redistribution of annual volumes across a broader time period, while the overall annual volumes have remained relatively unchanged. This underscores the complexity of hydrological patterns, emphasizing the need to consider total volumes and their temporal distribution in analyses. The findings enhance understanding of current changes and align with findings in the boreal-subarctic area.</p>}},
author = {{Lintunen, Karoliina and Kasvi, Elina and Uvo, Cintia B. and Alho, Petteri}},
issn = {{2214-5818}},
keywords = {{Discharge; Finnish rivers; Time series analysis; Trends}},
language = {{eng}},
publisher = {{Elsevier}},
series = {{Journal of Hydrology: Regional Studies}},
title = {{Changes in the discharge regime of Finnish rivers}},
url = {{http://dx.doi.org/10.1016/j.ejrh.2024.101749}},
doi = {{10.1016/j.ejrh.2024.101749}},
volume = {{53}},
year = {{2024}},
}