Long-term changes of Daugava River ice phenology under the impact of the cascade of hydro power plants
This paper presents the results of the study of long-term changes of Daugava River ice phenology, i.e. the freeze-up date, the break-up date, and the duration of ice cover from 1919/1920 to 2011/2012, under the impact of the cascade of hydro power plants. The long-term changes of ice phenology were...
Main Authors: | , , |
---|---|
Format: | Article |
Language: | English |
Published: |
Sciendo
2016-04-01
|
Series: | Proceedings of the Latvian Academy of Sciences. Section B, Natural Sciences |
Subjects: | |
Online Access: | https://doi.org/10.1515/prolas-2016-0012 |
id |
doaj-31cba11df99d4769863df71f88e88a42 |
---|---|
record_format |
Article |
spelling |
doaj-31cba11df99d4769863df71f88e88a422021-09-05T13:59:54ZengSciendoProceedings of the Latvian Academy of Sciences. Section B, Natural Sciences1407-009X2016-04-01702717710.1515/prolas-2016-0012prolas-2016-0012Long-term changes of Daugava River ice phenology under the impact of the cascade of hydro power plantsApsîte Elga0Elferts Didzis1Latkovska Inese2Faculty of Geography and Earth Sciences, University of Latvia, Jelgavas iela 1, Rīga, LV-1004, LATVIAFaculty of Biology, University of Latvia, Jelgavas iela 1, Rīga, LV-1004Faculty of Geography and Earth Sciences, University of Latvia, Jelgavas iela 1, Rīga, LV-1004, LATVIAThis paper presents the results of the study of long-term changes of Daugava River ice phenology, i.e. the freeze-up date, the break-up date, and the duration of ice cover from 1919/1920 to 2011/2012, under the impact of the cascade of hydro power plants. The long-term changes of ice phenology were determined by global climate warming at the turn of the 20th and the 21st centuries and anthropogenic activities after the year 1939. The Mann-Kendall test showed that the ice freeze-up date has a positive trend, while the ice break-up date and the duration of ice cover had negative trends. The changes were statistically significant. Data series covering twenty years before and after construction of the hydro power plants were used for assessing the impact of each hydro power plant on changes of Daugava River ice phenology parameters. The study results showed that the duration of ice cover was significantly longer in water reservoirs, i.e. the freeze-up date was earlier and the break-up date was later. Downstream of dams duration of ice cover was shorter with later freeze-up dates and earlier break-up dates. The impact of hydro power plants on ice phenology parameters gradually decreased with distance down from the dams.https://doi.org/10.1515/prolas-2016-0012river icetrendshydro power plantdaugava river |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Apsîte Elga Elferts Didzis Latkovska Inese |
spellingShingle |
Apsîte Elga Elferts Didzis Latkovska Inese Long-term changes of Daugava River ice phenology under the impact of the cascade of hydro power plants Proceedings of the Latvian Academy of Sciences. Section B, Natural Sciences river ice trends hydro power plant daugava river |
author_facet |
Apsîte Elga Elferts Didzis Latkovska Inese |
author_sort |
Apsîte Elga |
title |
Long-term changes of Daugava River ice phenology under the impact of the cascade of hydro power plants |
title_short |
Long-term changes of Daugava River ice phenology under the impact of the cascade of hydro power plants |
title_full |
Long-term changes of Daugava River ice phenology under the impact of the cascade of hydro power plants |
title_fullStr |
Long-term changes of Daugava River ice phenology under the impact of the cascade of hydro power plants |
title_full_unstemmed |
Long-term changes of Daugava River ice phenology under the impact of the cascade of hydro power plants |
title_sort |
long-term changes of daugava river ice phenology under the impact of the cascade of hydro power plants |
publisher |
Sciendo |
series |
Proceedings of the Latvian Academy of Sciences. Section B, Natural Sciences |
issn |
1407-009X |
publishDate |
2016-04-01 |
description |
This paper presents the results of the study of long-term changes of Daugava River ice phenology, i.e. the freeze-up date, the break-up date, and the duration of ice cover from 1919/1920 to 2011/2012, under the impact of the cascade of hydro power plants. The long-term changes of ice phenology were determined by global climate warming at the turn of the 20th and the 21st centuries and anthropogenic activities after the year 1939. The Mann-Kendall test showed that the ice freeze-up date has a positive trend, while the ice break-up date and the duration of ice cover had negative trends. The changes were statistically significant. Data series covering twenty years before and after construction of the hydro power plants were used for assessing the impact of each hydro power plant on changes of Daugava River ice phenology parameters. The study results showed that the duration of ice cover was significantly longer in water reservoirs, i.e. the freeze-up date was earlier and the break-up date was later. Downstream of dams duration of ice cover was shorter with later freeze-up dates and earlier break-up dates. The impact of hydro power plants on ice phenology parameters gradually decreased with distance down from the dams. |
topic |
river ice trends hydro power plant daugava river |
url |
https://doi.org/10.1515/prolas-2016-0012 |
work_keys_str_mv |
AT apsiteelga longtermchangesofdaugavarivericephenologyundertheimpactofthecascadeofhydropowerplants AT elfertsdidzis longtermchangesofdaugavarivericephenologyundertheimpactofthecascadeofhydropowerplants AT latkovskainese longtermchangesofdaugavarivericephenologyundertheimpactofthecascadeofhydropowerplants |
_version_ |
1717812804883316736 |