Search

Your search keyword '"Merz R"' showing total 5 results
Start Over Author "Merz R" Topic climate change
5 results on '"Merz R"'

1. Changing climate both increases and decreases European river floods.

Author

Blöschl G, Hall J, Viglione A, Perdigão RAP, Parajka J, Merz B, Lun D, Arheimer B, Aronica GT, Bilibashi A, Boháč M, Bonacci O, Borga M, Čanjevac I, Castellarin A, Chirico GB, Claps P, Frolova N, Ganora D, Gorbachova L, Gül A, Hannaford J, Harrigan S, Kireeva M, Kiss A, Kjeldsen TR, Kohnová S, Koskela JJ, Ledvinka O, Macdonald N, Mavrova-Guirguinova M, Mediero L, Merz R, Molnar P, Montanari A, Murphy C, Osuch M, Ovcharuk V, Radevski I, Salinas JL, Sauquet E, Šraj M, Szolgay J, Volpi E, Wilson D, Zaimi K, and Živković N

Subjects
Climate Change history, Europe, Floods history, Floods prevention & control, Geographic Mapping, History, 20th Century, History, 21st Century, Rain, Seasons, Time Factors, Climate Change statistics & numerical data, Floods statistics & numerical data, Rivers
Abstract

Climate change has led to concerns about increasing river floods resulting from the greater water-holding capacity of a warmer atmosphere 1 . These concerns are reinforced by evidence of increasing economic losses associated with flooding in many parts of the world, including Europe 2 . Any changes in river floods would have lasting implications for the design of flood protection measures and flood risk zoning. However, existing studies have been unable to identify a consistent continental-scale climatic-change signal in flood discharge observations in Europe 3 , because of the limited spatial coverage and number of hydrometric stations. Here we demonstrate clear regional patterns of both increases and decreases in observed river flood discharges in the past five decades in Europe, which are manifestations of a changing climate. Our results-arising from the most complete database of European flooding so far-suggest that: increasing autumn and winter rainfall has resulted in increasing floods in northwestern Europe; decreasing precipitation and increasing evaporation have led to decreasing floods in medium and large catchments in southern Europe; and decreasing snow cover and snowmelt, resulting from warmer temperatures, have led to decreasing floods in eastern Europe. Regional flood discharge trends in Europe range from an increase of about 11 per cent per decade to a decrease of 23 per cent. Notwithstanding the spatial and temporal heterogeneity of the observational record, the flood changes identified here are broadly consistent with climate model projections for the next century 4,5 , suggesting that climate-driven changes are already happening and supporting calls for the consideration of climate change in flood risk management.

Published
2019
Full Text
View/download PDF

2. Hydrology under change: an evaluation protocol to investigate how hydrological models deal with changing catchments.

Author

Thirel, G., Andréassian, V., Perrin, C., Audouy, J.-N., Berthet, L., Edwards, P., Folton, N., Furusho, C., Kuentz, A., Lerat, J., Lindström, G., Martin, E., Mathevet, T., Merz, R., Parajka, J., Ruelland, D., and Vaze, J.

Subjects
HYDROLOGY, WATERSHEDS, HYDROLOGIC models, CLIMATE change, RUNOFF models
Abstract

Copyright of Hydrological Sciences Journal/Journal des Sciences Hydrologiques is the property of Taylor & Francis Ltd and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Published
2015
Full Text
View/download PDF

3. On the role of the runoff coefficient in the mapping of rainfall to flood return periods.

Author

Viglione, A., Merz, R., and Blöschl, G.

Subjects
HYDROLOGICAL research, WATER balance (Hydrology), CLIMATE change, METEOROLOGICAL precipitation, HYDROLOGIC cycle, RAINFALL, FLOODS, STORMS, STATISTICAL correlation, STANDARD deviations
Abstract

While the correspondence of rainfall return period TP and flood return period TQ is at the heart of the design storm procedure, their relationship is still poorly understood. The purpose of this paper is to shed light on the controls on this relationship examining in particular the effect of the variability of event runoff coefficients. A simplified world with block rainfall and linear catchment response is assumed and a derived flood frequency approach, both in analytical and Monte-Carlo modes, is used. The results indicate that TQ can be much higher than TP of the associated storm. The ratio TQ/TP depends on the average wetness of the system. In a dry system, TQ can be of the order of hundreds of times of TP . In contrast, in a wet system, the maximum flood return period is never more than a few times that of the corresponding storm. This is because a wet system cannot be much worse than it normally is. The presence of a threshold effect in runoff generation related to storm volume reduces the maximum ratio of TQ/TP since it decreases the randomness of the runoff coefficients and increases the probability to be in a wet situation. We also examine the relation between the return periods of the input and the output of the design storm procedure when using a pre-selected runoff coefficient and the question which runoff coefficients produce a flood return period equal to the rainfall return period. For the systems analysed here, this runoff coefficient is always larger than the median of the runoff coefficients that cause the maximum annual floods. It depends on the average wetness of the system and on the return period considered, and its variability is particularly high when a threshold effect in runoff generation is present. [ABSTRACT FROM AUTHOR]

Published
2009
Full Text
View/download PDF

4. Changing climate both increases and decreases European river floods

Author

Ralf Merz, Maria Kireeva, Ardian Bilibashi, Marzena Osuch, Günter Blöschl, Jose Luis Salinas, Andrea Kiss, Thomas Kjeldsen, Attilio Castellarin, David Lun, Julia Hall, Conor Murphy, Neil Macdonald, Jamie Hannaford, Mojca Šraj, Alberto Montanari, Ján Szolgay, Klodian Zaimi, Ivan Radevski, Eric Sauquet, Valeryia Ovcharuk, Juraj Parajka, Daniele Ganora, Peter Molnar, Alberto Viglione, Donna Wilson, Silvia Kohnová, Liudmyla Gorbachova, Elena Volpi, Nenad Živković, Marco Borga, Pierluigi Claps, Berit Arheimer, Jarkko J. Koskela, Shaun Harrigan, Ondrej Ledvinka, Maria Mavrova-Guirguinova, Giovanni Battista Chirico, Ognjen Bonacci, Giuseppe Tito Aronica, Rui A. P. Perdigão, Luis Mediero, Ivan Čanjevac, Bruno Merz, Ali Gül, Miloň Boháč, Natalia Frolova, Bloschl G., Hall J., Viglione A., Perdigao R.A.P., Parajka J., Merz B., Lun D., Arheimer B., Aronica G.T., Bilibashi A., Bohac M., Bonacci O., Borga M., Canjevac I., Castellarin A., Chirico G.B., Claps P., Frolova N., Ganora D., Gorbachova L., Gul A., Hannaford J., Harrigan S., Kireeva M., Kiss A., Kjeldsen T.R., Kohnova S., Koskela J.J., Ledvinka O., Macdonald N., Mavrova-Guirguinova M., Mediero L., Merz R., Molnar P., Montanari A., Murphy C., Osuch M., Ovcharuk V., Radevski I., Salinas J.L., Sauquet E., Sraj M., Szolgay J., Volpi E., Wilson D., Zaimi K., Zivkovic N., Bloschl, G., Hall, J., Viglione, A., Perdigao, R. A. P., Parajka, J., Merz, B., Lun, D., Arheimer, B., Aronica, G. T., Bilibashi, A., Bohac, M., Bonacci, O., Borga, M., Canjevac, I., Castellarin, A., Chirico, G. B., Claps, P., Frolova, N., Ganora, D., Gorbachova, L., Gul, A., Hannaford, J., Harrigan, S., Kireeva, M., Kiss, A., Kjeldsen, T. R., Kohnova, S., Koskela, J. J., Ledvinka, O., Macdonald, N., Mavrova-Guirguinova, M., Mediero, L., Merz, R., Molnar, P., Montanari, A., Murphy, C., Osuch, M., Ovcharuk, V., Radevski, I., Salinas, J. L., Sauquet, E., Sraj, M., Szolgay, J., Volpi, E., Wilson, D., Zaimi, K., Zivkovic, N., INSTITUTE OF HYDRAULIC ENGINEERING AND WATER RESOURCES MANAGEMENT TECHNISCHE UNIVERSITAT WIEN AUT, Partenaires IRSTEA, Institut national de recherche en sciences et technologies pour l'environnement et l'agriculture (IRSTEA)-Institut national de recherche en sciences et technologies pour l'environnement et l'agriculture (IRSTEA), FACULTY OF GEOGRAPHY UNIVERSITY OF BELGRADE SRB, DEPARTMENT OF ENVIRONMENT LAND AND INFRASTRUCTURE ENGINEERING POLITECNICO DI TORINO TURIN ITA, HELMHOLTZ CENTRE POTSDAM GFZ GERMAN RESEARCH CENTRE FOR GEOSCIENCES POTSDAM DEU, DEPARTMENT OF ENGINEERING UNIVERSITY OF MESSINA ITA, CZECH HYDROMETEOROLOGICAL INSTITUTE PRAGUE CZE, FACULTY OF CIVIL ENGINEERING ARCHITECTURE AND GEODESY SPLIT UNIVERSITY HRV, DEPARTMENT OF LAND ENVIRONMENT AGRICULTURE AND FORESTRY UNIVERSITY OF PADOVA ITA 11, University of Zagreb, DEPARTMENT OF CIVIL CHEMICAL ENVIRONMENTAL AND MATERIALS ENGINEERING UNIVERSITA DI BOLOGNA ITA, DEPARTMENT OF AGRICULTURAL SCIENCES UNIVERSITY OF NAPLES FEDERICO II ITA, DEPARTMENT OF LAND HYDROLOGY LOMONOSOV MOSCOW STATE UNIVERSITY MOSCOW RUS, DEPARTMENT OF HYDROLOGICAL RESEARCH UKRAINIAN HYDROMETEOROLOGICAL INSTITUTE KIEV UKR, DEPARTMENT OF CIVIL ENGINEERING DOKUZ EYLUL UNIVERSITY IZMIR TUR, CENTRE FOR ECOLOGY AND HYDROLOGY WALLINGFORD GBR, FORECAST DEPARTMENT EUROPEAN CENTRE FOR MEDIUM-RANGE WEATHER FORECASTS READING GBR, DEPARTMENT OF ARCHITECTURE AND CIVIL ENGINEERING UNIVERSITY OF BATH GBR, DEPARTMENT OF LAND AND WATER RESOURCES MANAGEMENT FACULTY OF CIVIL ENGINEERING SLOVAK UNIVERSITY OF TECHNOLOGY IN BRATISLAVA SVK, CSE CONTROL SYSTEMS ENGINEER RENEWABLE ENERGY SYSTEMS AND TECHNOLOGY TIRANA ALB, FINNISH ENVIRONMENT INSTITUTE HELSINKI FIN, DEPARTMENT OF GEOGRAPHY AND PLANNING UNIVERSITY OF LIVERPOOL GBR, INSTITUTE OF RISK AND UNCERTAINTY UNIVERSITY OF LIVERPOOL GBR, UNIVERSITY OF ARCHITECTURE CIVIL ENGINEERING AND GEODESY SOFIA BGR, DEPARTMENT OF CIVIL ENGINEERING HYDRAULIC ENERGY AND ENVIRONMENT UNIVERSIDAD POLITECNICA DE MADRID ESP, DEPARTMENT FOR CATCHMENT HYDROLOGY HELMHOLTZ CENTRE FOR ENVIRONMENTAL RESEARCH HALLE DEU, INSTITUTE OF ENVIRONMENTAL ENGINEERING ETH ZURICH CHE, IRISH CLIMATE ANALYSIS AND RESEARCH UNITS DEPARTMENT OF GEOGRAPHY MAYNOOTH UNIVERSITY IRL, DEPARTMENT OF HYDROLOGY AND HYDRODYNAMICS INSTITUTE OF GEOPHYSICS POLISH ACADEMY OF SCIENCES WARSAW POL, HYDROMETEOROLOGICAL INSTITUTE ODESSA STATE ENVIRONMENTAL UNIVERSITY ODESSA UKR., RiverLy (UR Riverly), Institut national de recherche en sciences et technologies pour l'environnement et l'agriculture (IRSTEA), FACULTY OF CIVIL AND GEODETIC ENGINEERING UNIVERSITY OF LJUBLJANA SVN, Department of Engineering [Roma], Roma Tre University, NORWEGIAN WATER RESOURCES AND ENERGY DIRECTORATE OSLO NOR, INSTITUTE OF GEOSCIENCES ENERGY WATER AND ENVIRONMENT POLYTECHNIC UNIVERSITY OF TIRANA ALB, Blöschl, Günter, Hall, Julia, Viglione, Alberto, Perdigão, Rui A P, Parajka, Juraj, Merz, Bruno, Lun, David, Arheimer, Berit, Aronica, Giuseppe T, Bilibashi, Ardian, Boháč, Miloň, Bonacci, Ognjen, Borga, Marco, Čanjevac, Ivan, Castellarin, Attilio, Chirico, Giovanni B, Claps, Pierluigi, Frolova, Natalia, Ganora, Daniele, Gorbachova, Liudmyla, Gül, Ali, Hannaford, Jamie, Harrigan, Shaun, Kireeva, Maria, Kiss, Andrea, Kjeldsen, Thomas R, Kohnová, Silvia, Koskela, Jarkko J, Ledvinka, Ondrej, Macdonald, Neil, Mavrova-Guirguinova, Maria, Mediero, Lui, Merz, Ralf, Molnar, Peter, Montanari, Alberto, Murphy, Conor, Osuch, Marzena, Ovcharuk, Valeryia, Radevski, Ivan, Salinas, José L, Sauquet, Eric, Šraj, Mojca, Szolgay, Jan, Volpi, Elena, Wilson, Donna, Zaimi, Klodian, and Živković, Nenad

Subjects
History, Time Factors, 010504 meteorology & atmospheric sciences, Rain, Geographic Mapping, 02 engineering and technology, 01 natural sciences, SDG 13 - Climate Action, 020701 environmental engineering, Multidisciplinary, Flooding (psychology), food and beverages, 21st Century, 6. Clean water, Europe, 20th Century, VARIABILITY, Climate Change, Floods, History, 20th Century, History, 21st Century, Seasons, Rivers, [SDE]Environmental Sciences, population characteristics, geographic locations, 0207 environmental engineering, Climate change, River floods, FREQUENCY, TERM, Hydrology (agriculture), parasitic diseases, medicine, Precipitation, General, 0105 earth and related environmental sciences, Flood myth, fungi, Seasonality, medicine.disease, Climate change, river flood discharge, Europe, risk management, flooding, climate change, SEASONALITY, 13. Climate action, Snowmelt, Environmental science, Climate model, Physical geography
Abstract

Climate change has led to concerns about increasing river floods resulting from the greater water-holding capacity of a warmer atmosphere1. These concerns are reinforced by evidence of increasing economic losses associated with flooding in many parts of the world, including Europe2. Any changes in river floods would have lasting implications for the design of flood protection measures and flood risk zoning. However, existing studies have been unable to identify a consistent continental-scale climatic-change signal in flood discharge observations in Europe3, because of the limited spatial coverage and number of hydrometric stations. Here we demonstrate clear regional patterns of both increases and decreases in observed river flood discharges in the past five decades in Europe, which are manifestations of a changing climate. Our results—arising from the most complete database of European flooding so far—suggest that: increasing autumn and winter rainfall has resulted in increasing floods in northwestern Europe; decreasing precipitation and increasing evaporation have led to decreasing floods in medium and large catchments in southern Europe; and decreasing snow cover and snowmelt, resulting from warmer temperatures, have led to decreasing floods in eastern Europe. Regional flood discharge trends in Europe range from an increase of about 11 per cent per decade to a decrease of 23 per cent. Notwithstanding the spatial and temporal heterogeneity of the observational record, the flood changes identified here are broadly consistent with climate model projections for the next century4,5, suggesting that climate-driven changes are already happening and supporting calls for the consideration of climate change in flood risk management. Analysis of a comprehensive European flood dataset reveals regional changes in river flood discharges in the past five decades that are consistent with models suggesting that climate-driven changes are already happening.

Published
2019

5. Understanding flood regime changes in Europe: a state-of-the-art assessment

Author

Andrea Kiss, Peter Molnar, Alberto Montanari, Marco Borga, Rudolf Brázdil, Berit Arheimer, Luis Mediero, J Kriaučiūnienė, Juraj Parajka, Lenka Plavcová, Zbigniew W. Kundzewicz, Neil McIntyre, Alberto Viglione, Michel Lang, Christoph Schär, Neil Macdonald, Ján Szolgay, Ralf Merz, Pierluigi Claps, Maria Carmen Llasat, Rui A. P. Perdigão, C Neuhold, Günter Blöschl, Jose Luis Salinas, Julia Hall, Bruno Merz, Magdalena Rogger, Eric Sauquet, Thomas Kjeldsen, J. Hall, B. Arheimer, M. Borga, R. Brazdil, P. Clap, A. Ki, T. R. Kjeldsen, J. Kriaucieniene, Z. W. Kundzewicz, M. Lang, M. C. Llasat, N. Macdonald, N. McIntyre, L. Mediero, B. Merz, R. Merz, P. Molnar, A. Montanari, C. Neuhold, J. Parajka, R. A. P. Perdigao, L. Plavcov, M. Rogger, J. L. Salina, E. Sauquet, C. Schar, J. Szolgay, A. Viglione, G. Bloeschl, Universitat de Barcelona, Hall, J., Arheimer, B., Borga, M., Brázdil, R., Claps, P., Kiss, A., Kjeldsen, T.R., Kriauĉuniene, J., Kundzewicz, Z.W., Lang, M., Llasat, M.C., Macdonald, N., McIntyre, N., Mediero, L., Merz, B., Merz, R., Molnar, P., Montanari, A., Neuhold, C., Parajka, J., Perdigão, R.A.P., Plavcová, L., Rogger, M., Salinas, J.L., Sauquet, E., Schär, C., Szolgay, J., Viglione, A., and Blöschl, G.

Subjects
010504 meteorology & atmospheric sciences, Operations research, 0207 environmental engineering, Climate change, 02 engineering and technology, 01 natural sciences, lcsh:Technology, lcsh:TD1-1066, HYDROLOGY, Rivers, Earth and Planetary Sciences (miscellaneous), lcsh:Environmental technology. Sanitary engineering, 020701 environmental engineering, Short duration, lcsh:Environmental sciences, Water Science and Technology, 0105 earth and related environmental sciences, Cursos d'aigua, lcsh:GE1-350, Flood myth, business.industry, lcsh:T, Environmental resource management, Flooding (psychology), lcsh:Geography. Anthropology. Recreation, 6. Clean water, Floods, Current (stream), Europe, lcsh:G, 13. Climate action, Inundacions, Environmental science, State (computer science), business, Europa
Abstract

Losing streams that are influenced by wastewater treatment plant effluents and combined sewer overflows (CSOs) can be a source of groundwater contamination. Released micropollutants such as pharmaceuticals, endocrine disrupters and other ecotoxicologically relevant substances as well as inorganic wastewater constituents can reach the groundwater, where they may deteriorate groundwater quality. This paper presents a method to quantify exfiltration mass flow rates per stream length unit Mex of wastewater constituents from losing streams by the operation of integral pumping tests (IPTs) up- and downstream of a target section. Due to the large sampled water volume during IPTs the results are more reliable than those from conventional point sampling. We applied the method at a test site in Leipzig (Germany). Wastewater constituents K+ and NO3− showed Mex values of 1241 to 4315 and 749 to 924 mg mstream−1 d−1, respectively, while Cl− (16.8 to 47.3 g mstream−1 d−1) and SO42− (20.3 to 32.2 g mstream−1 d−1) revealed the highest observed Mex values at the test site. The micropollutants caffeine and technical-nonylphenol were dominated by elimination processes in the groundwater between upstream and downstream wells. Additional concentration measurements in the stream and a connected sewer at the test site were performed to identify relevant processes that influence the concentrations at the IPT wells. ISSN:1812-2116 ISSN:1812-2108

Published
2014

Catalog

Books, media, physical & digital resources
See catalog results