@book{BronstertThiekenMerzetal.2004, author = {Bronstert, Axel and Thieken, Annegret and Merz, Bruno and Rode, Michael and Menzel, Lucas}, title = {Wasser- und Stofftransport in heterogenen Einzugsgebieten : Beitr{\"a}ge zum Tag der Hydrologie 2004, 22./ 23. M{\"a}rz 2004 in Potsdam ; Bd. 1 Vortr{\"a}ge}, volume = {5}, publisher = {ATV-DVWK}, address = {Hennef (Sieg)}, isbn = {3-937758-18-6}, pages = {315 S.}, year = {2004}, language = {de} } @book{BronstertThiekenMerzetal.2004, author = {Bronstert, Axel and Thieken, Annegret and Merz, Bruno and Rode, Michael and Menzel, Lucas}, title = {Wasser- und Stofftransport in heterogenen Einzugsgebieten : Beitr{\"a}ge zum Tag der Hydrologie 2004, 22./ 23. M{\"a}rz 2004 in Potsdam ; Bd. 2 Poster}, publisher = {ATV-DVWK}, address = {Hennef}, isbn = {3-937758-18-6}, pages = {221 S.}, year = {2004}, language = {de} } @phdthesis{Merz2006, author = {Merz, Bruno}, title = {Absch{\"a}tzung von Hochwasserrisiken Methoden, Grenzen und M{\"o}glichkeiten}, address = {Potsdam}, pages = {x, 351 S. : graph. Darst.}, year = {2006}, language = {de} } @book{Merz2007, author = {Merz, Bruno}, title = {Der Umgang mit Naturgewalten in Deutschland : vom Reagieren zum Risikomanagement : Antrittsvorlesung 2007-07-05}, publisher = {Univ.-Bibl.}, address = {Potsdam}, year = {2007}, abstract = {Ob sich extreme Naturereignisse zu Katastrophen ausweiten, h{\"a}ngt von der Vorsorge der Gesellschaft und ihrer Reaktion in Krisensituationen ab. Grundlage f{\"u}r einen wirksamen Umgang mit Naturgefahren ist der Kreislauf des Risikomanagements. Erst auf der Analyse m{\"o}glicher Extremereignisse, ihrer Eintrittswahrscheinlichkeiten sowie der Konsequenzen f{\"u}r die Gesellschaft lassen sich optimale Schutzstrategien ableiten. Vor dem Hintergrund sich st{\"a}ndig wandelnder Randbedingungen, beispielsweise durch den Klimawandel, ist der Umgang mit Ungewissheit eine der gr{\"o}ßten Herausforderungen.}, language = {de} } @book{Merz2007, author = {Merz, Bruno}, title = {Der Umgang mit Naturgewalten in Deutschland : vom Regieren zum Risikomanagment : Antrittsvorlesung 2007-07-05}, publisher = {Univ.-Bibl.}, address = {Potsdam}, year = {2007}, abstract = {Ob sich extreme Naturereignisse zu Katastrophen ausweiten, h{\"a}ngt von der Vorsorge der Gesellschaft und ihrer Reaktion in Krisensituationen ab. Grundlage f{\"u}r einen wirksamen Umgang mit Naturgefahren ist der Kreislauf des Risikomanagements. Erst auf der Analyse m{\"o}glicher Extremereignisse, ihrer Eintrittswahrscheinlichkeiten sowie der Konsequenzen f{\"u}r die Gesellschaft lassen sich optimale Schutzstrategien ableiten. Vor dem Hintergrund sich st{\"a}ndig wandelnder Randbedingungen, beispielsweise durch den Klimawandel, ist der Umgang mit Ungewissheit eine der gr{\"o}ßten Herausforderungen.}, language = {de} } @article{SwierczynskiLauterbachDulskietal.2013, author = {Swierczynski, Tina and Lauterbach, Stefan and Dulski, Peter and Delgado, Jose Miguel Martins and Merz, Bruno and Brauer, Achim}, title = {Mid- to late holocene flood frequency changes in the northeastern Alps as recorded in varved sediments of Lake Mondsee (Upper Austria)}, series = {Quaternary science reviews : the international multidisciplinary research and review journal}, volume = {80}, journal = {Quaternary science reviews : the international multidisciplinary research and review journal}, publisher = {Elsevier}, address = {Oxford}, issn = {0277-3791}, doi = {10.1016/j.quascirev.2013.08.018}, pages = {78 -- 90}, year = {2013}, abstract = {Annually laminated (varved) lake sediments with intercalated detrital layers resulting from sedimentary input by runoff events are ideal archives to establish precisely dated records of past extreme runoff events. In this study, the mid- to late Holocene varved sediments of Lake Mondsee (Upper Austria) were analysed by combining sedimentological, geophysical and geochemical methods. This approach allows to distinguish two types of detrital layers related to different types of extreme runoff events (floods and debris flows) and to detect changes in flood activity during the last 7100 years. In total, 271 flood and 47 debris flow layers, deposited during spring and summer, were identified, which cluster in 18 main flood episodes (FE 1-18) with durations of 30-50 years each. These main flood periods occurred during the Neolithic (7100-7050 vyr BP and 6470-4450 vyr BP), the late Bronze Age and the early Iron Age (3300-3250 and 2800-2750 vyr BP), the late Iron Age (2050-2000 vyr BP), throughout the Dark Ages Cold Period (1500-1200 vyr BP), and at the end of the Medieval Warm Period and the Little Ice Age (810-430 vyr BP). Summer flood episodes in Lake Mondsee are generally more abundant during the last 1500 years, often coinciding with major advances of Alpine glaciers. Prior to 1500 vyr BP, spring/summer floods and debris flows are generally less frequent, indicating a lower number of intense rainfall events that triggered erosion. In comparison with the increase of late Holocene flood activity in western and northwestern (NW) Europe, commencing already as early as 2800 yr BP, the hydro-meteorological shift in the Lake Mondsee region occurred much later. These time lags in the onset of increased hydrological activity might be either due to regional differences in atmospheric circulation pattern or to the sensitivity of the individual flood archives. The Lake Mondsee sediments represent the first precisely dated and several millennia long summer flood record for the northeastern (NE) Alps, a key region at the climatic boundary of Atlantic, Mediterranean and East European air masses, aiding a better understanding of regional and seasonal peculiarities of flood occurrence under changing climate conditions. (C) 2013 Elsevier Ltd. All rights reserved.}, language = {en} } @article{UhlemannBertelmannMerz2013, author = {Uhlemann, S. and Bertelmann, Roland and Merz, Bruno}, title = {Data expansion the potential of grey literature for understanding floods}, series = {Hydrology and earth system sciences : HESS}, volume = {17}, journal = {Hydrology and earth system sciences : HESS}, number = {3}, publisher = {Copernicus}, address = {G{\"o}ttingen}, issn = {1027-5606}, doi = {10.5194/hess-17-895-2013}, pages = {895 -- 911}, year = {2013}, abstract = {Sophisticated methods have been developed and become standard in analysing floods as well as for assessing flood risk. However, increasingly critique of the current standards and scientific practice can be found both in the flood hydrology community as well as in the risk community who argue that the considerable amount of information already available on natural disasters has not been adequately deployed and brought to effective use. We describe this phenomenon as a failure to synthesize knowledge that results from barriers and ignorance in awareness, use and management of the entire spectrum of relevant content, that is, data, information and knowledge. In this paper we argue that the scientific community in flood risk research ignores event-specific analysis and documentations as another source of data. We present results from a systematic search that includes an intensive study on sources and ways of information dissemination of flood-relevant publications. We obtain 186 documents that contain information on the sources, pathways, receptors and/or consequences for any of the 40 strongest trans-basin floods in Germany in the period 1952-2002. This study therefore provides the most comprehensive metadata collection of flood documentations for the considered geographical space and period. A total of 87.5\% of all events have been documented, and especially the most severe floods have received extensive coverage. Only 30\% of the material has been produced in the scientific/academic environment, and the majority of all documents (about 80\%) can be considered grey literature (i.e. literature not controlled by commercial publishers). Therefore, ignoring grey sources in flood research also means ignoring the largest part of knowledge available on single flood events (in Germany). Further, the results of this study underpin the rapid changes in information dissemination of flood event literature over the last decade. We discuss the options and obstacles of incorporating this data into the knowledge-building process in light of the current technological developments and international, interdisciplinary debates for data curation.}, language = {en} } @article{MerzAertsArnbjergNielsenetal.2014, author = {Merz, Bruno and Aerts, Jeroen C. J. H. and Arnbjerg-Nielsen, Karsten and Baldi, M. and Becker, Andrew C. and Bichet, A. and Bloeschl, G. and Bouwer, Laurens M. and Brauer, Achim and Cioffi, F. and Delgado, Jose Miguel Martins and Gocht, M. and Guzzetti, F. and Harrigan, S. and Hirschboeck, K. and Kilsby, C. and Kron, W. and Kwon, H. -H. and Lall, U. and Merz, R. and Nissen, K. and Salvatti, P. and Swierczynski, Tina and Ulbrich, U. and Viglione, A. and Ward, P. J. and Weiler, M. and Wilhelm, B. and Nied, Manuela}, title = {Floods and climate: emerging perspectives for flood risk assessment and management}, series = {Natural hazards and earth system sciences}, volume = {14}, journal = {Natural hazards and earth system sciences}, number = {7}, publisher = {Copernicus}, address = {G{\"o}ttingen}, issn = {1561-8633}, doi = {10.5194/nhess-14-1921-2014}, pages = {1921 -- 1942}, year = {2014}, abstract = {Flood estimation and flood management have traditionally been the domain of hydrologists, water resources engineers and statisticians, and disciplinary approaches abound. Dominant views have been shaped; one example is the catchment perspective: floods are formed and influenced by the interaction of local, catchment-specific characteristics, such as meteorology, topography and geology. These traditional views have been beneficial, but they have a narrow framing. In this paper we contrast traditional views with broader perspectives that are emerging from an improved understanding of the climatic context of floods. We come to the following conclusions: (1) extending the traditional system boundaries (local catchment, recent decades, hydrological/hydraulic processes) opens up exciting possibilities for better understanding and improved tools for flood risk assessment and management. (2) Statistical approaches in flood estimation need to be complemented by the search for the causal mechanisms and dominant processes in the atmosphere, catchment and river system that leave their fingerprints on flood characteristics. (3) Natural climate variability leads to time-varying flood characteristics, and this variation may be partially quantifiable and predictable, with the perspective of dynamic, climate-informed flood risk management. (4) Efforts are needed to fully account for factors that contribute to changes in all three risk components (hazard, exposure, vulnerability) and to better understand the interactions between society and floods. (5) Given the global scale and societal importance, we call for the organization of an international multidisciplinary collaboration and data-sharing initiative to further understand the links between climate and flooding and to advance flood research.}, language = {en} } @article{NguyenNghiaHungDelgadoGuentneretal.2014, author = {Nguyen Nghia Hung, and Delgado, Jos{\´e} Miguel Martins and Guentner, Andreas and Merz, Bruno and Bardossy, Andras and Apel, Heiko}, title = {Sedimentation in the floodplains of the Mekong Delta, Vietnam Part II: deposition and erosion}, series = {Hydrological processes}, volume = {28}, journal = {Hydrological processes}, number = {7}, publisher = {Wiley-Blackwell}, address = {Hoboken}, issn = {0885-6087}, doi = {10.1002/hyp.9855}, pages = {3145 -- 3160}, year = {2014}, abstract = {Deposition and erosion play a key role in the determination of the sediment budget of a river basin, as well as for floodplain sedimentation. Floodplain sedimentation, in turn, is a relevant factor for the design of flood protection measures, productivity of agro-ecosystems, and for ecological rehabilitation plans. In the Mekong Delta, erosion and deposition are important factors for geomorphological processes like the compensation of deltaic subsidence as well as for agricultural productivity. Floodplain deposition is also counteracting the increasing climate change induced hazard by sea level rise in the delta. Despite this importance, a sediment database of the Mekong Delta is lacking, and the knowledge about erosion and deposition processes is limited. In the Vietnamese part of the Delta, the annually flooded natural floodplains have been replaced by a dense system of channels, dikes, paddy fields, and aquaculture ponds, resulting in floodplain compartments protected by ring dikes. The agricultural productivity depends on the sediment and associated nutrient input to the floodplains by the annual floods. However, no quantitative information regarding their sediment trapping efficiency has been reported yet. The present study investigates deposition and erosion based on intensive field measurements in three consecutive years (2008, 2009, and 2010). Optical backscatter sensors are used in combination with sediment traps for interpreting deposition and erosion processes in different locations. In our study area, the mean calculated deposition rate is 6.86kg/m(2) (approximate to 6mm/year). The key parameters for calculating erosion and deposition are estimated, i.e. the critical bed shear stress for deposition and erosion and the surface constant erosion rate. The bulk of the floodplain sediment deposition is found to occur during the initial stage of floodplain inundation. This finding has direct implications on the operation of sluice gates in order to optimize sediment input and distribution in the floodplains.}, language = {en} } @article{NguyenNghiaHungDelgadoGuentneretal.2014, author = {Nguyen Nghia Hung, and Delgado, Jos{\´e} Miguel Martins and G{\"u}ntner, Andreas and Merz, Bruno and Bardossy, Andras and Apel, Heiko}, title = {Sedimentation in the floodplains of the Mekong Delta, Vietnam. Part I: suspended sediment dynamics}, series = {Hydrological processes}, volume = {28}, journal = {Hydrological processes}, number = {7}, publisher = {Wiley-Blackwell}, address = {Hoboken}, issn = {0885-6087}, doi = {10.1002/hyp.9856}, pages = {3132 -- 3144}, year = {2014}, abstract = {Suspended sediment is the primary source for a sustainable agro-ecosystem in the Mekong Delta by providing nutrient input for the subsequent cropping season. In addition, the suspended sediment concentration (SSC) plays an important role in the erosion and deposition processes in the Delta; that is, it influences the morphologic development and may counteract the deltaic subsidence and sea level rise. Despite this importance, little is known about the dynamics of suspended sediment in the floodplains of the Mekong Delta. In particular, quantitative analyses are lacking mainly because of data scarcity with respect to the inundation processes in the floodplains. In 2008, therefore, a comprehensive in situ system to monitor the dynamics of suspended sediment in a study area located in the Plain of Reeds was established, aiming at the characterization and quantification of suspended sediment dynamics in the deeply inundated parts of the Vietnamese part of the Mekong Delta. The monitoring system was equipped with seven water quality-monitoring stations. They have a robust design and autonomous power supply suitable for operation on inundated floodplains, enabling the collection of reliable data over a long period of time with a high temporal resolution. The data analysis shows that the general seasonal dynamics of suspended sediment transport in the Delta is controlled by two main mechanisms: the flood wave of the Mekong River and the tidal backwater influences from the coast. In the channel network, SSC decreases exponentially with distance from the Mekong River. The anthropogenic influence on SSC could also be identified for two periods: at the start of the floodplain inundation and at the end of the flood period, when subsequent paddy rice crops are prepared. Based on the results, we recommend an operation scheme for the sluice gates, which intends to distribute the sediment and thus the nutrients equally over the floodplain.}, language = {en} }