Browsing by Author "Laaha, Gregor"
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- A global dataset of near-natural basins for climate change detectionPublication . Turner, Steve; Hannaford; Berker, Lucy; Dixon, Harry; Griffin, Adam; Kumar, Amit; Suman, Gayatri; Goula, Albert Bi Tié; Watson, Andrew; Pedersen, Anja Iselin; Fleig, Anne; Bodian, Ansoumana; Renard, Benjamin; Arheimer, Berit; Alvarez-Garreton, Camila; Kan, Caroline; Ekkawatpanit, Chaiwat; Murphy, Conor; Ngondondo, Cosmo; Kingston, Daniel; El Khalki,El Mahdi; Amoussou, Ernest; Formetta, Giuseppe; Hodgkins, Glenn; Laaha, Gregor; Sigurðsson,Gunnar; Boutaghson,Hammouda; Giraldo Osorio, Juan Diego; Stahl, Kerstin; Kuraji, Koichiro; Medeiro, Luis; Albuquerque, Maria Teresa; Hanel, Martin; Toucher, Michele; Piniewski,Mikołaj; Saidi, Mohamed Elmehdi; Gautam, Narayan; Venegas Cordero, Nelson; Ribeiro, Nuno de Almeida; O'Connor, Paul; Whitfield, Paul; Schmocker, Petra; Hung-Khoa, Pham Thanh; Midgley, Guy; Rachdane, Mariame; Capell, René; Fonseca, Rita; Mager,Sarah; Westra, Seth; Jain,Sharad; Takanoir,Shimizu; Horton, Sophie; Vissesri, Supattra; Berezowski, Tomasz; Lopes, Walszon; Markonis,Yannis; Asano, Yuko; Tramblay, YvesAs hydrological extremes become more severe in the warming world, impacts to livelihoods, infrastructure, and economies worsen. To attribute emerging trends to climate change, we need to remove the signal of anthropogenic activities, such as, the presence of dams, land-cover change, channelisation and the abstraction of water for public water supplies, industry and agriculture. These human disturbances can obscure climate change signals and distort trends in river flows and, in some cases, lead to a complete reversal of true, natural trends.
- 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.