TY - GEN A1 - Gädeke, Anne A1 - Hölzel, Herwig A1 - Koch, Hagen A1 - Pohle, Ina A1 - Grünewald, Uwe T1 - Analysis of uncertainties in the hydrological response of a model-based climate change impact assessment in a subcatchment of the Spree River, Germany T2 - Hydrological Processes N2 - Climate change impact assessments form the basis for the development of suitable climate change adaptation strategies. For this purpose, ensembles consisting of stepwise coupled models are generally used [emission scenario global circulation model downscaling approach (DA) bias correction impact model (hydrological model)], in which every item is affected by considerable uncertainty. The aim of the current study is (1) to analyse the uncertainty related to the choice of the DA as well as the hydrological model and its parameterization and (2) to evaluate the vulnerabil-ity of the studied catchment, a subcatchment of the highly anthropogenically impacted Spree River catchment, to hydrological change. Four different DAs are used to drive four different model configurations of two conceptually different hydrological models (Water Balance Simulation Model developed at ETH Zürich and HBV-light). In total, 452 simulations are carried out. The results show that all simulations compute an increase in air temperature and potential evapotranspiration. For precipitation, runoff and actual evapotranspiration, opposing trends are computed depending on the DA used to drive the hydrological models. Overall, the largest source of uncertainty can be attributed to the choice of the DA, especially regarding whether it is statistical or dynamical. The choice of the hydrological model and its parameterization is of less importance when long-term mean annual changes are compared. The large bandwidth at the end of the modelling chain may exacerbate the formulation of suitable climate change adaption strategies on the regional scale. KW - climate change impact assessment KW - regional climate models KW - HBV-light KW - WaSiM-ETH KW - hydrological modelling KW - uncertainty Y1 - 2014 UR - http://onlinelibrary.wiley.com/doi/10.1002/hyp.9933/abstract U6 - https://doi.org/10.1002/hyp.9933 SN - 1099-1085 VL - 28 IS - 12 SP - 3978 EP - 3998 ER - TY - GEN A1 - Hölzel, Herwig A1 - Diekkrüger, Bernd A1 - Biemelt, Detlef A1 - Gädeke, Anne T1 - Impact of dumped sediment structures on hydrological modelling in the artificial Chicken Creek catchment, Germany T2 - Journal of Hydrology N2 - Summary Revealing the hydrological impact of sediment structures promises a better understanding of the influence of the spatial variability of sediment properties on the hydrological patterns and processes at the catchment scale. To improve the knowledge of structure-process interactions in initial ecosystems, the 6-ha artificial Chicken Creek Catchment in Germany was investigated by the Transregional Collaborative Research Centre 38 (SFB/TRR 38). Sediment structures called pour-ribs, which are dumped by stackers during the construction process, lead to differently compacted sediment zones, which increase the spatial variability of sediments’ hydraulic properties. Although levelled afterwards by bulldozers, the majority of these structures remain in the subsurface. To analyse the effects of pour-ribs on the hydrological catchment’s behaviour, the process-based spatially distributed Water balance Simulation Model (WaSiM-ETH) was applied. The results show that the consideration of pour-ribs improves the runoff simulation and significantly affects the simulated soil moisture patterns and, thereby, the initial stage of the ecosystem development. Compacted zones act as hydraulic barriers and inhibit subsurface lateral water flow, whereas non-compacted zones constitute areas with increased water storage capacity. Both effects cause reduced catchment runoff. Moreover, disregarding of the pour-ribs was identified as a source of model uncertainty in previous studies. A further outcome of this study is the importance of a global sensitivity analysis as a tool for model improvement. Finally, the results stress the importance of considering the variability of sediment properties for hydrological modelling at the catchment scale. KW - Process-based hydrological modelling KW - Hydrological pattern and processes KW - Structure-process interactions KW - Initial ecosystem development Y1 - 2013 UR - http://www.sciencedirect.com/science/article/pii/S0022169412010086# U6 - https://doi.org/10.1016/j.jhydrol.2012.11.029 SN - 0022-1694 VL - 477 SP - 189 EP - 202 ER - TY - GEN A1 - Holländer, Hartmut M. A1 - Buytaert, Wouter A1 - Blume, Theresa A1 - Chirico, Giovanni B. A1 - Bormann, Helge A1 - Exbrayat, Jean-François A1 - Gustafsson, David A1 - Hölzel, Herwig A1 - Kraft, Philipp A1 - Stamm, Christian A1 - Stoll, Sebastian A1 - Blöschl, Günter A1 - Flühler, Hannes T1 - Comparative predictions of discharge from an artificial catchment (Chicken Creek) using sparse data T2 - Hydrology and earth system sciences discussions Y1 - 2009 UR - http://www.hydrol-earth-syst-sci-discuss.net/6/3199/2009/hessd-6-3199-2009.pdf SN - 1812-2116 VL - 6 SP - 3199 EP - 3260 ET - 2 ER - TY - CHAP A1 - Gädeke, Anne A1 - Hölzel, Herwig A1 - Koch, Hagen A1 - Grünewald, Uwe ED - Weiler, Markus T1 - Analyse der Bandbreiten von Modellketten am Beispiel von Klimaprojektionsstudien auf den Wasserhaushalt in einem Teileinzugsgebiet der Spree T2 - Wasser ohne Grenzen, Beiträge zum Tag der Hydrologie 2012 Y1 - 2012 UR - http://tdh2012.uni-freiburg.de/download/tagungsband SN - 978-3-942964-38-8 SP - 381 EP - 382 PB - DWA CY - Hennef ER - TY - GEN A1 - Hölzel, Herwig A1 - Rössler, O. A1 - Diekkrüger, Bernd T1 - Grope in the Dark - Hydrological modelling of the artificial Chicken Creek catchment without validation possibilities Y1 - 2011 UR - http://www.sciencedirect.com/science/journal/14747065 ER - TY - CHAP A1 - Bormann, Helge A1 - Holländer, Hartmut M. A1 - Blume, Theresa A1 - Buytaert, Wouter A1 - Chirico, Giovanni B. A1 - Exbrayat, Jean-Francois A1 - Gustafsson, David A1 - Hölzel, Herwig A1 - Kraft, Philipp A1 - Krauße, Thomas A1 - Nazemi, Ali A1 - Stamm, Christian A1 - Stoll, Sebastian A1 - Blöschl, Günter A1 - Flühler, Hannes ED - Blöschl, Günter ED - Merz, Ralf T1 - Modellkonzept vs. Modellierer wer oder was ist wichtiger? Vergleichende Modellanwendung am Hühnerwasser-Einzugsgebiet T2 - Hydrologie & Wasserwirtschaft - von der Theorie zur Praxis, Beiträge zum Tag der Hydrologie am 24./25. März 2011 an der Technischen Universität Wien Y1 - 2011 SN - 978-3-941897-79-3 SP - 152 EP - 160 PB - DWA CY - Hennef ER - TY - CHAP A1 - Grünewald, Uwe A1 - Bücker, A. A1 - Damm, M. A1 - Fleischhammel, Petra A1 - Hölzel, Herwig A1 - Kaiser, Knut T1 - Materialien zum Fachsymposium "Wasserbezogene Anpassungsmaßnahmen an den Landschafts- und Klimawandel in Deutschland" Y1 - 2011 UR - http://www.acatech.de/fileadmin/user_upload/Baumstruktur_nach_Website/Acatech/root/de/Publikationen/Materialien/Fachsymposium_Anpassungsmassnahmen_2011.pdf ER - TY - GEN A1 - Bormann, Helge A1 - Holländer, Hartmut M. A1 - Blume, Theresa A1 - Buytaert, Wouter A1 - Chirico, Giovanni B. A1 - Exbrayat, Jean-Francois A1 - Gustafsson, David A1 - Hölzel, Herwig A1 - Kraft, Philipp A1 - Krauße, Thomas A1 - Nazemi, Ali A1 - Stamm, Christian A1 - Stoll, Sebastian A1 - Blöschl, Günter A1 - Flühler, Hannes T1 - Modellkonzept vs. Modellierer wer oder was ist wichtiger? Vergleichende Modellanwendung am Hühnerwasser-Einzugsgebiet T2 - Korrespondenz Wasserwirtschaft Y1 - 2011 U6 - https://doi.org/10.3243/kwe2011.09.001 SN - 1865-9926 VL - 4 IS - 9 SP - 487 EP - 491 ER - TY - CHAP A1 - Hölzel, Herwig A1 - Diekkrüger, Bernd ED - Otto, Jan-Christoph T1 - Hydrological Analyses as a Prerequisite for Soil Erosion Modeling - Landscape Related Studies in a Mesoscale Hydrological Catchment T2 - Landform - structure, evolution, process control, Proceedings of the International Symposium on Landform organised by the Research Training Group 437 Y1 - 2010 UR - http://www.springerlink.com/content/e8r27330k5418581 SN - 978-3-540-75761-0 SN - 978-3-540-75760-3 EP - 127 PB - Springer CY - Berlin ER - TY - GEN A1 - Hölzel, Herwig A1 - Diekkrüger, Bernd T1 - Predicting the impact of linear landscape elements on surface runoff, soil erosion, and sedimentation in the Wahnbach Catchment, Germany Y1 - 2011 U6 - https://doi.org/http://onlinelibrary.wiley.com/doi/10.1002/hyp.8282/pdf ER - TY - GEN A1 - Bormann, Helge A1 - Holländer, Hartmut M. A1 - Blume, Theresa A1 - Buytaert, Wouter A1 - Chirico, Giovanni B. A1 - Exbrayat, Jean-Francois A1 - Gustafsson, David A1 - Hölzel, Herwig A1 - Kraft, Philipp A1 - Krauße, Thomas A1 - Nazemi, Ali A1 - Stamm, Christian A1 - Stoll, Sebastian A1 - Blöschl, Günter A1 - Flühler, Hannes T1 - Comparative discharge prediction from a small artificial catchment without model calibration: representation of initial hydrological catchment development Y1 - 2011 UR - http://www.boku.ac.at/diebodenkultur/volltexte/band-62/heft-1-4/bormann.pdf ER - TY - CHAP A1 - Holländer, Hartmut M. A1 - Blume, Theresa A1 - Bormann, Helge A1 - Buytaert, Wouter A1 - Chirico, Giovanni B. A1 - Exbrayat, Jean-Francois A1 - Gustafsson, David A1 - Hölzel, Herwig A1 - Krauße, Thomas A1 - Nazemi, Ali T1 - The human factor in catchment modeling: from a priori prediction to calibration T2 - Structures and processes of the initial ecosystem development, 1st International Conference associated with 4th Meeting of Young Researchers in Earth Sciences (MYRES), 20-24 September 2010, Cottbus, Germany, proceedings Y1 - 2010 UR - https://www-docs.b-tu.de/chicken-creek/public/Proceedings_TR38_2010.pdf SP - 55 EP - 56 PB - BTU CY - Cottbus ER - TY - CHAP A1 - Hölzel, Herwig A1 - Biemelt, Detlef A1 - Diekkrüger, Bernd A1 - Gädeke, Anne T1 - How does spatially varying saturated hydraulic conductivity effect hydrological patterns and processes in the artificial Chicken Creek Catchment? T2 - Structures and processes of the initial ecosystem development, 1st International Conference associated with 4th Meeting of Young Researchers in Earth Sciences (MYRES), 20-24 September 2010, Cottbus, Germany, proceedings Y1 - 2010 UR - https://www-docs.b-tu.de/chicken-creek/public/Proceedings_TR38_2010.pdf SP - S. 57 PB - BTU CY - Cottbus ER - TY - CHAP A1 - Gädeke, Anne A1 - Pohle, Ina A1 - Hölzel, Herwig A1 - Koch, Hagen A1 - Grünewald, Uwe ED - Grünewald, Uwe ED - Bens, Oliver ED - Fischer, Holger ED - Hüttl, Reinhard F. ED - Kaiser, Knut ED - Knierim, Andrea T1 - Analyse zum Einfluss des Landschafts- und Klimawandels auf den Wasserhaushalt in einem Teileinzugsgebiet der Spree T2 - Wasserbezogene Anpassungsmaßnahmen an den Landschafts- und Klimawandel N2 - In dieser Studie wird der Einfluss von Klima- und Landnutzungsänderungen mit zwei hydrologischen Modellen auf den Wasserhaushalt in einem Teileinzugsgebiet der Spree untersucht. Der Einfluss des Klimawandels auf den Wasserhaushalt wurde mit dem Wasserhaushalts-Simulations-Modell (WaSiM-ETH) analysiert. Um eine große Bandbreite an möglichen Entwicklungen abzubilden, wurden die meteorologischen Größen von 100 Realisierungen des regionalen Klimamodells STAR zum Antrieb von WaSiM-ETH verwendet. Die Ergebnisse zeigen im langjährigen Mittel einen Niederschlagsrückgang um 7,1 % sowie eine Zunahme der potentiellen und tatsächlichen Verdunstung um 17,6 % bzw. 4 %. Infolgedessen nehmen der Abfluss um 37,2 % und die Grundwasserneubildung um 22 % ab. Außerdem sinkt die Bodenfeuchte in der Wurzelzone in den Monaten Juli bis September von 69 % nutzbare Feldkapazität (nFK) auf 52 % nFK, was zu leichtem Trockenstress bei Ackerkulturen mit hohem Wasserbedarf in dieser Periode führen kann. Um den Einfluss von Landnutzungsänderungen, wie bspw. einen verstärkten Anbau von Energiepflanzen (Raps, Mais, Sorghum), auf den Wasserhaushalt abzuschätzen, wurde das ökohydrologische Modell SWIM (Soil and Water Integrated Model) verwendet. Bei den Energiepflanzen verringert sich die jährlich simulierte tatsächliche Verdunstung im Mittel um 10,3 %, wohingegen sich der jährliche Abfluss um 31,2 % und die Grundwasserneubildung um 33 % erhöhen. Insbesondere die Energiepflanzen Mais und Sorghum besitzen im Hochsommer einen hohen Wasserbedarf, was eine zusätzliche Bewässerung erforderlich machen kann. Die Auswirkungen des Klimawandels auf den Wasserhaushalt können diese Entwicklung weiter verschärfen. Da es sich bei den Ergebnissen um Modellierungen handelt, dürfen diese nicht als sicher, sondern unter den getroffenen Annahmen als repräsentativ für die wahrscheinliche zukünftige Entwicklung des Wasserhaushalts unter dem zu erwartenden Klima- und Landschaftswandels verstanden werden. N2 - This study presents scenarios calculated with two different hydrological models analysing the water balance under changing climate and land use conditions for a sub catchment of the river Spree. The impact of climate change on the water balance was estimated using the Water balance Simulation Model (WaSiM-ETH). In order to depict a large range of possible future development, the meteorological parameters of 100 realisations of the regional climate model STAR were used to drive WaSiM-ETH. The results show in the long term average a decrease in precipitation by 7.1 % as well as an increase in the potential and actual evapotranspiration by 17.6 % and 4 %, respectively. Consequently, the discharge is reduced by 37.2 % and the groundwater recharge by 22 %. Moreover, the soil moisture in the root zone decreases in the month of July to September from 69 % effective field capacity to 52 % effective field capacity, which may lead to drought stress for crops with a high water demand during that period. In order to assess the influence of land use change, such as increasing cultivation of energy crops (e.g. canola, corn, sorghum), on the water balance, the ecohydrological Soil and Water Integrated Model (SWIM) was used. For the energy crops, the average yearly simulated evapotranspiration decreases by 10.3 %, whereas yearly discharge and groundwater recharge increase by 31.2 % and 33 %, respectively. Especially the energy crops corn and sorghum are characterized by a high water demand during midsummer which can make additional irrigation necessary. The impacts of climate change on the water balance can exacerbate this development. Since these findings represent modelling results, they cannot be regarded as certain but must be interpreted under the assumption taken as representative for the probable future development. KW - Wasserhaushalt KW - Energiepflanzen KW - Waldumbau KW - hydrologisches Modell Y1 - 2012 SN - 978-3-510-65274-7 SP - 81 EP - 94 PB - Schweizerbart CY - Stuttgart ER - TY - CHAP A1 - Hölzel, Herwig A1 - Diekkrüger, Bernd A1 - Biemelt, Detlef A1 - Gädeke, Anne T1 - Simulation of hydrological impact of dumped sediment structures in the artificial Chicken Creek catchment, Germany Y1 - 2012 UR - http://meetingorganizer.copernicus.org/EGU2012/EGU2012-2323-1.pdf ER - TY - CHAP A1 - Hölzel, Herwig A1 - Gädeke, Anne A1 - Koch, Hagen A1 - Grünewald, Uwe T1 - Assessment of climate change impacts on hydrological processes and patterns in the Spree River catchment Y1 - 2012 UR - http://meetingorganizer.copernicus.org/EGU2012/EGU2012-2321-1.pdf ER - TY - CHAP A1 - Gädeke, Anne A1 - Hölzel, Herwig A1 - Koch, Hagen A1 - Grünewald, Uwe T1 - Assessing possibilities of reducing the uncertainity related to climate change impact studies T2 - EGU General Assembly 2012, held 22-27 April, 2012 in Vienna Y1 - 2012 UR - http://meetingorganizer.copernicus.org/EGU2012/EGU2012-c-1.pdf SP - 1 PB - European Geophysical Society CY - Katlenburg-Lindau ER -