Browsing by Author "Mediero, Luis"
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- Documentary evidence of past floods in Europe and their utility in flood frequency estimationPublication . Kjeldsen, T.R.; Macdonald, N.; Lang, M.; Mediero, Luis; Albuquerque, M.T.D.; Bogdanowicz, E.; Brazdil, R.; Castellarin, A.; David, V.; Fleig, A.; Gül, G.O.; Kriauciuniene, J.; Kohnova, S.; Merz, B.; Nicholson, O.; Roald, L.A.; Salinas, J.L.; Sarauskiene, D.; Sraj, M.; Strupczewski, W.; Szolgay, J.; Toumazis, A.; Vanneuville, W.; Veijalainen, N.; Wilson, D.This review outlines the use of documentary evidence of historical flood events in contemporary flood frequency estimation in European countries. The study shows that despite widespread consensus in the scientic literature on the utility of documentary evidence, the actual migration from academic to practical application has been limited. A detailed review of flood frequency estimation guidelines from dierent countries showed that the value of historical data is generally recognised, but practical methods for systematic and routine inclusion of this type of data into risk analysis are in most cases not available. Studies of historical events were identied in most countries, and good examples of national databases attempting to collate the available information were identied. The conclusion is that there is considerable potential for improving the reliability of the current flood risk assessments by harvesting the valuable information on past extreme events contained in the historical data sets.
- Trends in flow intermittence for European riversPublication . Tramblay, Yves; Rutkowska, Agnieszka; Sauquet, Eric; Sefton, Catherine; Laaha, Gregor; Osuch, Marzena; Albuquerque, M.T.D.; Alves, Maria Helena; Banasik, Kazimierz; Beaufort, Aurelien; Brocca, Luca; Camici, Stefania; Zoltan, Csabai; Dakhlaoui, Hammouda; Girolamo, Anna Maria de; Rflinger, Gerald D.; Gallart, Francesc; Gauster, Tobias; Hanich, Lahoucine; Kohnova, Silvia; Mediero, Luis; Plamen, Ninov; Parry, Simon; Segu, Pere Quintana; Tzoraki, Ourania; Datry, ThibaultIntermittent rivers are prevalent in many countries across Europe, but little is known about the temporal evolution of intermittence and its relationship with climate variability. Trend analysis of the annual and seasonal number of zero-flow days, the of dry spells and the mean date of the zero-flow events is performed on a database of 452 rivers with varying degrees of intermittence between 1970 and 2010. The relationships between flow intermittence and climate are investigated using the standardized precipitation evapotranspiration index (SPEI) and climate indices describing large-scale atmospheric circulation. The results indicate a strong spatial variability of the seasonal patterns of intermittence and the annual and seasonal number of zero-flow days, highlighting the controls exerted by local catchment properties. Most of the detected trends indicate an increasing number of zero-flow days, which also tend to occur earlier in the year, particularly in southern Europe. The SPEI is found to be strongly related to the annual and seasonal zero-flow day occurrence in more than half of the stations for different accumulation times between 12 and 24 months. Conversely, there is a weaker dependence of river intermittence with large-scale circulation indices. Overall, these results suggest increased water stress in intermittent rivers that may affect their biota and biochemistry and also reduce available water resources.