Archive Project News
Greenhouse gases contributed substantially to the risk of floods in Autumn 2000 Greenhouse gas emissions due to human activity substantially increased the odds of damaging floods occurring in England and Wales in Autumn 2000 according to new research published in the journal Nature. Although the precise magnitude is still uncertain, the researchers found a 2-in-3 chance that the odds were increased by about a factor of two or more.
Oxford University, February 15, 2011
WATCH article "Can atmospheric circulation be linked to flooding in Europe?" in Journal Hydrological Processes This paper evaluates whether circulation type catalogues (CTCs) can inform on the occurrence of floods in Europe, and if the same few circulation types (CTs) are systematically associated with floods at the European scale. A measure of the spatial coherence of CT was introduced to compare the relative performance of CTCs in discriminating flood events, based on a local indicator measuring if a CT occurs more frequently than usual prior/during a flood.
Hydrological Processes / Christel Prudhomme, Marie Genevier, January 19, 2011
WATCH members participate in European Geosciences Union General Assembly 2011 sessions At least 2 EGU sessions will be co-convened by members of WATCH. These will be held during European Geosciences Union, General Assembly 2011, Vienna, Austria, 03-08 April 2011. EGU session titles: HS2.9 Hydrological change: Regional hydrological behaviour under transient climate and land use conditions, and HS2.11 session: "Hydrological extremes: from droughts to floods"
EGU, January 03, 2011
WATCH article: "Streamflow trends in Europe: evidence from a dataset" published in HESS 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 1962–2004 provided the best spatial coverage, but analyses were also carried out for longer time periods (with fewer stations), starting in 1932,
1942 and 1952.
K. Stahl, H. Hisdal, J. Hannaford, L. M. Tallaksen, H. A. J. van Lanen, E. Sauquet, S. Demuth / HESS doi:10.5194/hess-14-2367-2010, December 01, 2010
WATCH Technical Report Number 25: Comparison of three drought monitoring tools in the USA Drought has no universal definition, which has led to a large set of indicators. The National Drought Mitigation Center in the USA has combined several drought indicators, based on objective and subjective information, into three online drought monitoring tools: the U.S. Drought Monitor (DM), the Vegetation Drought Response Index (VegDRI) and the Drought Impact Reporter (DIR). This research compares these tools qualitatively and quantitatively and assesses their objectivity. This was done for four case studies (Texas, California, Hawaii and Wisconsin). It can be concluded that DM is the best tool when describing droughts, because it includes subjective information and impact information. The DIR is a good database, but it needs more diverse input (e.g. from all sectors and from a variety of sources). Furthermore the outcome showed that including impacts (mainly subjective) is important when classifying a drought. The drought monitoring tools that are used in the USA are trying to do this and these tools could be used as models in developing a European or global drought monitoring tool.
Esther Dieker, Henny A.J. van Lanen and Mark Svoboda, November 24, 2010
2010 WATCH General Assembly was held in Amsterdam The WATCH General Assembly is held in Amsterdam this time. The meeting already started at Sunday 31 of October with work block meetings and will close on Friday with a WaterMIP sessions.
WATCH Secretary, November 08, 2010
Regional drought over the UK and changes in the future This paper develops tools to assess regional drought events based on limited periods of record and applies them to regional climate model output to examine potential future changes in drought due to increased greenhouse gases. The drought metric was defined as a monthly time series of standardized 12-month precipitation accumulations. Regional drought events were characterised by determining the severity, area, duration and frequency of dry periods. In order to improve statistical inference of drought events, a drought generator was adopted to synthesis a large number of events trained on the available data. In nearly all cases, the drought generator produces synthetic events with drought characteristics statistically indistinguishable from the training data.
To be published in the Journal of Hydrology The Article is in Press, Accepted Manuscript.
ScienceDirect.com doi:10.1016/j.jhydrol.2010.10.003 / Journal of Hydrology, October 10, 2010