A century of variations in extreme flow across Finnish rivers
River flow in cold climates is known to be one of the hydrological systems most affected by climate change, playing a central role in the sustainability of downstream socio-ecological systems. Numerous studies on the temporal and spatial variations of streamflow characteristics have been done, and a...
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ftdoajarticles:oai:doaj.org/article:272527bd462e42a1aae120305e2207bc 2023-09-05T13:17:39+02:00 A century of variations in extreme flow across Finnish rivers Alireza Gohari Abolfazl Jalali Shahrood Sahand Ghadimi Mohammadreza Alborz Epari Ritesh Patro Björn Klöve Ali Torabi Haghighi 2022-01-01T00:00:00Z https://doi.org/10.1088/1748-9326/aca554 https://doaj.org/article/272527bd462e42a1aae120305e2207bc EN eng IOP Publishing https://doi.org/10.1088/1748-9326/aca554 https://doaj.org/toc/1748-9326 doi:10.1088/1748-9326/aca554 1748-9326 https://doaj.org/article/272527bd462e42a1aae120305e2207bc Environmental Research Letters, Vol 17, Iss 12, p 124027 (2022) extreme hydrology inter-annual variability spatiotemporal trend climate change Finnish rivers Environmental technology. Sanitary engineering TD1-1066 Environmental sciences GE1-350 Science Q Physics QC1-999 article 2022 ftdoajarticles https://doi.org/10.1088/1748-9326/aca554 2023-08-13T00:36:51Z River flow in cold climates is known to be one of the hydrological systems most affected by climate change, playing a central role in the sustainability of downstream socio-ecological systems. Numerous studies on the temporal and spatial variations of streamflow characteristics have been done, and a comprehensive study on the variation of hydrologic extremes is becoming increasingly important. This study evaluated the long-running changes in the magnitude, time, and inter-annual variability of hydrologic extremes, including high and low flow in 16 major Finnish rivers. We applied four new hydrologic extreme indices for summer–winter low flow ratio, spring-absolute high flow ratio, time-to-peak index, and increasing rate index during the snowmelt period to analyze the spatiotemporal variations of extreme streamflow from 1911 to 2020. The most detected trends in flow regimes have started in the last six decades and become more severe from 1991 to 2020, which is likely to be dominated by anthropogenic global warming. The results also indicated that alteration of low pulses in most rivers was associated with an increase (decrease) in winter (summer) flows, suggesting the annual minimum flow in summer frequently contradicts natural hydrologic regimes in Arctic rivers. Southern Finland has experienced higher variations in extreme hydrology over the last century. A new low flow regime was detected for southern rivers, characterized by frequent annual minimum flow in summer instead of winter. Moreover, the annual maximum flow before/after spring dictated a new high-flow regime characterized by frequent double peak flows in this region. Article in Journal/Newspaper Arctic Climate change Global warming Directory of Open Access Journals: DOAJ Articles Arctic Environmental Research Letters 17 12 124027 |
institution |
Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
extreme hydrology inter-annual variability spatiotemporal trend climate change Finnish rivers Environmental technology. Sanitary engineering TD1-1066 Environmental sciences GE1-350 Science Q Physics QC1-999 |
spellingShingle |
extreme hydrology inter-annual variability spatiotemporal trend climate change Finnish rivers Environmental technology. Sanitary engineering TD1-1066 Environmental sciences GE1-350 Science Q Physics QC1-999 Alireza Gohari Abolfazl Jalali Shahrood Sahand Ghadimi Mohammadreza Alborz Epari Ritesh Patro Björn Klöve Ali Torabi Haghighi A century of variations in extreme flow across Finnish rivers |
topic_facet |
extreme hydrology inter-annual variability spatiotemporal trend climate change Finnish rivers Environmental technology. Sanitary engineering TD1-1066 Environmental sciences GE1-350 Science Q Physics QC1-999 |
description |
River flow in cold climates is known to be one of the hydrological systems most affected by climate change, playing a central role in the sustainability of downstream socio-ecological systems. Numerous studies on the temporal and spatial variations of streamflow characteristics have been done, and a comprehensive study on the variation of hydrologic extremes is becoming increasingly important. This study evaluated the long-running changes in the magnitude, time, and inter-annual variability of hydrologic extremes, including high and low flow in 16 major Finnish rivers. We applied four new hydrologic extreme indices for summer–winter low flow ratio, spring-absolute high flow ratio, time-to-peak index, and increasing rate index during the snowmelt period to analyze the spatiotemporal variations of extreme streamflow from 1911 to 2020. The most detected trends in flow regimes have started in the last six decades and become more severe from 1991 to 2020, which is likely to be dominated by anthropogenic global warming. The results also indicated that alteration of low pulses in most rivers was associated with an increase (decrease) in winter (summer) flows, suggesting the annual minimum flow in summer frequently contradicts natural hydrologic regimes in Arctic rivers. Southern Finland has experienced higher variations in extreme hydrology over the last century. A new low flow regime was detected for southern rivers, characterized by frequent annual minimum flow in summer instead of winter. Moreover, the annual maximum flow before/after spring dictated a new high-flow regime characterized by frequent double peak flows in this region. |
format |
Article in Journal/Newspaper |
author |
Alireza Gohari Abolfazl Jalali Shahrood Sahand Ghadimi Mohammadreza Alborz Epari Ritesh Patro Björn Klöve Ali Torabi Haghighi |
author_facet |
Alireza Gohari Abolfazl Jalali Shahrood Sahand Ghadimi Mohammadreza Alborz Epari Ritesh Patro Björn Klöve Ali Torabi Haghighi |
author_sort |
Alireza Gohari |
title |
A century of variations in extreme flow across Finnish rivers |
title_short |
A century of variations in extreme flow across Finnish rivers |
title_full |
A century of variations in extreme flow across Finnish rivers |
title_fullStr |
A century of variations in extreme flow across Finnish rivers |
title_full_unstemmed |
A century of variations in extreme flow across Finnish rivers |
title_sort |
century of variations in extreme flow across finnish rivers |
publisher |
IOP Publishing |
publishDate |
2022 |
url |
https://doi.org/10.1088/1748-9326/aca554 https://doaj.org/article/272527bd462e42a1aae120305e2207bc |
geographic |
Arctic |
geographic_facet |
Arctic |
genre |
Arctic Climate change Global warming |
genre_facet |
Arctic Climate change Global warming |
op_source |
Environmental Research Letters, Vol 17, Iss 12, p 124027 (2022) |
op_relation |
https://doi.org/10.1088/1748-9326/aca554 https://doaj.org/toc/1748-9326 doi:10.1088/1748-9326/aca554 1748-9326 https://doaj.org/article/272527bd462e42a1aae120305e2207bc |
op_doi |
https://doi.org/10.1088/1748-9326/aca554 |
container_title |
Environmental Research Letters |
container_volume |
17 |
container_issue |
12 |
container_start_page |
124027 |
_version_ |
1776198749665624064 |