Spectral‐temporal characterization of riverflow variability in England and Wales for the period 1865–2002
Abstract We have investigated riverflow variability in England and Wales by examining the reconstructed monthly discharge time series from fifteen catchments in these regions for the period 1865–2002. The riverflow fluctuations exhibit a strong annual cycle. The flow in the annual cycle is found to...
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crwiley:10.1002/hyp.7224 2024-06-23T07:55:09+00:00 Spectral‐temporal characterization of riverflow variability in England and Wales for the period 1865–2002 Sen, Asok K. 2009 http://dx.doi.org/10.1002/hyp.7224 https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1002%2Fhyp.7224 https://onlinelibrary.wiley.com/doi/pdf/10.1002/hyp.7224 en eng Wiley http://onlinelibrary.wiley.com/termsAndConditions#vor Hydrological Processes volume 23, issue 8, page 1147-1157 ISSN 0885-6087 1099-1085 journal-article 2009 crwiley https://doi.org/10.1002/hyp.7224 2024-05-31T08:12:55Z Abstract We have investigated riverflow variability in England and Wales by examining the reconstructed monthly discharge time series from fifteen catchments in these regions for the period 1865–2002. The riverflow fluctuations exhibit a strong annual cycle. The flow in the annual cycle is found to be intermittent, with the degree of intermittency varying from one catchment to another. An intermittent flow is characterized by bursts of high discharge separated by intervals with low or no discharge. By applying a continuous wavelet transform to the time series, we have identified the occurrence of intermittency in the annual cycle. The riverflow activity is also found to exhibit variations at interannual and quasi‐decadal time scales. These variations may be linked to large‐scale climatic processes such as the North Atlantic Oscillation (NAO). We have used the kurtosis of the probability density functions of the various time series as a measure of the degree of intermittency. An intermittent flow is characterized by a peaked (super‐Gaussian) probability density function with kurtosis in excess of 3. A higher value of kurtosis signifies a higher degree of intermittency. Intermittent fluctuations are more difficult to predict accurately than persistent oscillations, i.e., those lasting continuously over a long time interval. Copyright © 2009 John Wiley & Sons, Ltd. Article in Journal/Newspaper North Atlantic North Atlantic oscillation Wiley Online Library Hydrological Processes 23 8 1147 1157 |
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Abstract We have investigated riverflow variability in England and Wales by examining the reconstructed monthly discharge time series from fifteen catchments in these regions for the period 1865–2002. The riverflow fluctuations exhibit a strong annual cycle. The flow in the annual cycle is found to be intermittent, with the degree of intermittency varying from one catchment to another. An intermittent flow is characterized by bursts of high discharge separated by intervals with low or no discharge. By applying a continuous wavelet transform to the time series, we have identified the occurrence of intermittency in the annual cycle. The riverflow activity is also found to exhibit variations at interannual and quasi‐decadal time scales. These variations may be linked to large‐scale climatic processes such as the North Atlantic Oscillation (NAO). We have used the kurtosis of the probability density functions of the various time series as a measure of the degree of intermittency. An intermittent flow is characterized by a peaked (super‐Gaussian) probability density function with kurtosis in excess of 3. A higher value of kurtosis signifies a higher degree of intermittency. Intermittent fluctuations are more difficult to predict accurately than persistent oscillations, i.e., those lasting continuously over a long time interval. Copyright © 2009 John Wiley & Sons, Ltd. |
format |
Article in Journal/Newspaper |
author |
Sen, Asok K. |
spellingShingle |
Sen, Asok K. Spectral‐temporal characterization of riverflow variability in England and Wales for the period 1865–2002 |
author_facet |
Sen, Asok K. |
author_sort |
Sen, Asok K. |
title |
Spectral‐temporal characterization of riverflow variability in England and Wales for the period 1865–2002 |
title_short |
Spectral‐temporal characterization of riverflow variability in England and Wales for the period 1865–2002 |
title_full |
Spectral‐temporal characterization of riverflow variability in England and Wales for the period 1865–2002 |
title_fullStr |
Spectral‐temporal characterization of riverflow variability in England and Wales for the period 1865–2002 |
title_full_unstemmed |
Spectral‐temporal characterization of riverflow variability in England and Wales for the period 1865–2002 |
title_sort |
spectral‐temporal characterization of riverflow variability in england and wales for the period 1865–2002 |
publisher |
Wiley |
publishDate |
2009 |
url |
http://dx.doi.org/10.1002/hyp.7224 https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1002%2Fhyp.7224 https://onlinelibrary.wiley.com/doi/pdf/10.1002/hyp.7224 |
genre |
North Atlantic North Atlantic oscillation |
genre_facet |
North Atlantic North Atlantic oscillation |
op_source |
Hydrological Processes volume 23, issue 8, page 1147-1157 ISSN 0885-6087 1099-1085 |
op_rights |
http://onlinelibrary.wiley.com/termsAndConditions#vor |
op_doi |
https://doi.org/10.1002/hyp.7224 |
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Hydrological Processes |
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23 |
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1147 |
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1157 |
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1802647617706917888 |