<abstract xmlns="http://www.w3.org/1999/xhtml"><p>This paper aims at identification of changes in the spring discharge of six lowland rivers in Poland in 1966-2006. The contribution of the spring flow (February, March, April) in the annual flow was analysed as well as the 0.95 quantile time series of the daily flow. To investigate how the date of the occurrence of the spring riverflow changes, for each hydrological year the day up to which 50% of the annual flow had been reached was determined (CMD, the center of mass data). A test based on linear regression was applied, which determined the direction and rate of the changes. In five rivers, a statistically insignificant tendency to increase the contribution of the spring flow in the annual flow has been observed. A decreasing tendency in the spring discharge of all rivers has been shown; in two cases the changes are statistically significant. The tendencies in the CMD time series are not consistent.</p></abstract>

This paper aims at identification of changes in the spring discharge of six lowland rivers in Poland in 1966-2006. The contribution of the spring flow (February, March, April) in the annual flow was analysed as well as the 0.95 quantile time series of the daily flow. To investigate how the date of the occurrence of the spring riverflow changes, for each hydrological year the day up to which 50% of the annual flow had been reached was determined (CMD, the center of mass data). A test based on linear regression was applied, which determined the direction and rate of the changes. In five rivers, a statistically insignificant tendency to increase the contribution of the spring flow in the annual flow has been observed. A decreasing tendency in the spring discharge of all rivers has been shown; in two cases the changes are statistically significant. The tendencies in the CMD time series are not consistent.

Variability of Spring Riverflow of Selected Lowland Rivers

Faculty of Geography and Regional Studies, Department of Hydrology

Miscellanea Geographica

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 License.

{"article-title":"Variability of Spring Riverflow of Selected Lowland Rivers"}

This paper aims at identification of changes in the spring discharge of six lowland rivers in Poland in 1966-2006. The contribution of the spring flow...

Variability of Spring Riverflow of Selected Lowland Rivers

Published Online: Nov 25, 2018

Page range: 177 - 183

DOI: https://doi.org/10.2478/mgrsd-2010-0016

Keywords
spring flow, discharge, lowland rivers in Poland

© 2010 Izabela Piętka, published by Sciendo

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 License.

Variability of Spring Riverflow of Selected Lowland Rivers

Published Online: Nov 25, 2018

Page range: 177 - 183

DOI: https://doi.org/10.2478/mgrsd-2010-0016

Keywordsspring flow, discharge, lowland rivers in Poland

© 2010 Izabela Piętka, published by Sciendo

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 License.

Keywords
spring flow, discharge, lowland rivers in Poland