Temporal evolution of low‐flow regimes in Canadian rivers

Khaliq, M. N.; Ouarda, Taha B. M. J.; Gachon, Philippe; Sushama, Laxmi

doi:10.1029/2007wr006132

Cited by 94 publications

(99 citation statements)

References 57 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…an independent and identically distributed (IID) random variable or an autoregressive (AR) process have been questioned (Cohn and Lins, 2005;Koutsoyiannis and Montanari, 2007). Several studies have shown that streamflow does not behave as an IID or AR process, but tends to exhibit long-term persistence (LTP) and variability (e.g., von Storch, 1995;Koutsoyiannis, 2003Koutsoyiannis, , 2006Khaliq et al, 2008;Chen and Grasby, 2009). In addition, there are concerns about the power of various tests in the presence of auto and cross-correlation (Yue and Wang, 2002;Hamed and Rao, 1998).…”

Section: Trend Magnitudementioning

confidence: 99%

Streamflow trends in Europe: evidence from a dataset of near-natural catchments

Stahl

Hisdal

Hannaford

et al. 2010

Hydrol. Earth Syst. Sci.

407

295

View full text Add to dashboard Cite

Abstract. Streamflow observations from near-natural catchments are of paramount importance for detection and attribution studies, evaluation of large-scale model simulations, and assessment of water management, adaptation and policy options. This study investigates streamflow trends in a newly-assembled, consolidated dataset of near-natural streamflow records from 441 small catchments in 15 countries across Europe. The period 1962The period -2004 provided the best spatial coverage, but analyses were also carried out for longer time periods (with fewer stations), starting in 1932, 1942 and 1952. Trends were calculated by the slopes of the Kendall-Theil robust line for standardized annual and monthly streamflow, as well as for summer low flow magnitude and timing. A regionally coherent picture of annual streamflow trends emerged, with negative trends in southern and eastern regions, and generally positive trends elsewhere. Trends in monthly streamflow for 1962-2004 elucidated potential causes for these changes, as well as for changes in hydrological regimes across Europe. Positive trends were found in the winter months in most catchments. A marked shift towards negative trends was observed in April, gradually spreading across Europe to reach a maximum extentCorrespondence to: K. Stahl (kerstin.stahl@hydrology.uni-freiburg.de) in August. Low flows have decreased in most regions where the lowest mean monthly flow occurs in summer, but vary for catchments which have flow minima in winter and secondary low flows in summer. The study largely confirms findings from national and regional scale trend analyses, but clearly adds to these by confirming that these tendencies are part of coherent patterns of change, which cover a much larger region. The broad, continental-scale patterns of change are mostly congruent with the hydrological responses expected from future climatic changes, as projected by climate models. The patterns observed could hence provide a valuable benchmark for a number of different studies and model simulations.

show abstract

Section: Trend Magnitudementioning

confidence: 99%

Streamflow trends in Europe: evidence from a dataset of near-natural catchments

Stahl

Hisdal

Hannaford

et al. 2010

Hydrol. Earth Syst. Sci.

407

295

View full text Add to dashboard Cite

show abstract

“…Zhang et al 2001, Burn and Hag Elnur 2002, Yue et al 2001, Cunderlik and Burn 2004, Hodgkins and Dudley 2006, Khaliq et al 2008, Ehsanzadeh and Adamowski 2009, Burn et al 2010. The trend analysis studies have differed in: the variables examined, the approach used to identify trends, and the scope of the analysis, some studies being national in scope, while others have examined specific regions of Canada.…”

Section: Canadian Reference Networkmentioning

confidence: 99%

Reference hydrologic networks I. The status and potential future directions of national reference hydrologic networks for detecting trends

Whitfield

Burn

Hannaford

et al. 2012

Hydrological Sciences Journal

View full text Add to dashboard Cite

Identifying climate-driven trends in river flows on a global basis is hampered by a lack of long, quality time series data for rivers with relatively undisturbed regimes. This is a global problem compounded by the lack of support for essential long-term monitoring. Experience demonstrates that, with clear strategic objectives, and the support of sponsoring organizations, reference hydrologic networks can constitute an exceptionally valuable data source to effectively identify, quantify and interpret hydrological change-the speed and magnitude of which is expected to a be a primary driver of water management and flood alleviation strategies through the future-and for additional applications. Reference hydrologic networks have been developed in many countries in the past few decades. These collections of streamflow gauging stations, that are maintained and operated with the intention of observing how the hydrology of watersheds responds to variations in climate, are described. The status of networks under development is summarized. We suggest a plan of actions to make more effective use of this collection of networks.Key words reference networks; hydrometric data; hydrological change Les réseaux hydrologiques de référence I. Le statut et les orientations futures possibles des réseaux hydrologiques nationaux de référence pour détecter les tendancesRésumé L'identification de tendances induites par le climat dans le débit des rivières est entravée par le manque de longues séries chronologiques de qualité provenant de rivières dont le régime est peu altéré. Ce problème global est aggravé par le manque de soutien aux initiatives de suivi à long terme. L'expérience démontre qu'avec des objectifs stratégiques clairs ainsi qu'avec le soutien d'organismes de parrainage, les réseaux de référence hydrologiques peuvent s'avérer une précieuse source de données pour l'identification, la quantification et l'interprétation des changements hydrologiques. La vitesse et l'ampleur de ces derniers seront probablement à l'avenir des éléments importants pour la gestion de l'eau et la lutte contre les inondations. C'est pourquoi, d'autres applications étant sans doute à prévoir, des réseaux hydrologiques de référence ont été établis dans plusieurs pays au cours des dernières décennies. On décrit ces ensembles de stations de suivi hydrométrique, maintenues et exploitées dans l'intention d'observer comment l'hydrologie des bassins versants répond aux variations climatiques, ainsi que l'état actuel de développement de ces réseaux. Nous suggérons un plan d'action visant une utilisation plus efficace de ces réseaux.Mots clefs réseaux de référence; données hydrométriques; changement hydrologique

show abstract

“…Lettenmaier et al, 1994;Rose, 1. Introduction 2009;Lins and Slack , 1999;Small et al, 2006;Regonda et al, 2005;Khaliq et al, 2008].…”

Section: Trendsmentioning

confidence: 99%

Spatial cross‐correlation patterns of European low, mean and high flows

Gudmundsson¹,

Tallaksen²,

Stahl³

2011

Hydrological Processes

View full text Add to dashboard Cite

Low and high flows are associated with different hydrological processes. High flows correspond to the direct response of catchments to water input, whereas low flows occur in pronged dry periods and are governed by depleting storages. Therefore, the inter‐annual dynamics of high and low flows are often considered to be independent. To shed light on this assumption, we analysed a pan‐European dataset of 615 streamflow records, summarized as time series of annual streamflow percentiles (5th, 10th, …, 95th). The analysis was based on comparing the spatial cross‐correlation patterns derived from the different percentile series. Their interrelation was visualized by projecting them into a low‐dimensional space. We found that large parts of the cross‐correlations of the percentile series can be summarized by one dominating component. This component represents geographical continuous regions in Europe of correlated streamflow. Departures from this mean pattern occurred for low and high flows and were characterized by the corresponding spatial correlation functions. Generally, spatial correlations appear to be stronger for high flows than for mean flows, particularly for short distances (<400 km). Low flows, on the other hand, have the lowest spatial correlations for short distances. For longer distances (>800 km), this pattern reverses and the spatial correlation of low flows become largest. This discrepancy between low and high flows suggests that hydrological systems are more homogeneously linked to climatic fluctuations under wet conditions. Under dry conditions, local catchment properties appear to play a larger role in translating climatic fluctuations into hydrological response. Copyright © 2010 John Wiley & Sons, Ltd.

show abstract

Temporal evolution of low‐flow regimes in Canadian rivers

Cited by 94 publications

References 57 publications

Streamflow trends in Europe: evidence from a dataset of near-natural catchments

Streamflow trends in Europe: evidence from a dataset of near-natural catchments

Reference hydrologic networks I. The status and potential future directions of national reference hydrologic networks for detecting trends

Spatial cross‐correlation patterns of European low, mean and high flows

Contact Info

Product

Resources

About