TY - JOUR A1 - Zehe, Erwin A1 - Becker, Rolf A1 - Bardossy, Andras A1 - Plate, Erich T1 - Uncertainty of simulated catchment runoff response in the presence of threshold processes : role of initial soil moisture and precipitation N2 - This paper examines the effect of spatially variable initial soil moisture and spatially variable precipitation on predictive uncertainty of simulated catchment scale runoff response in the presence of threshold processes. The underlying philosophy is to use a physically based hydrological model named CATFLOW as a virtual landscape, assuming perfect knowledge of the processes. The model, which in particular conceptualizes preferential flow as threshold process, was developed based on intensive process and parameter studies and has already been successfully applied to simulate flow and transport at different scales and catchments. Study area is the intensively investigated Weiherbach catchment. Numerous replicas of spatially variable initial soil moisture or spatially variable precipitation with the same geostatistical properties are conditioned to observed soil moisture and precipitation data and serve as initial and boundary conditions for the model during repeated simulations. The effect of spatially soil moisture on modeling catchment runoff response was found to depend strongly on average saturation of the catchment. Different realizations of initial soil moisture yielded strongly different hydrographs for intermediate initial soil moisture as well as in dry catchment conditions; in other states the effect was found to be much lower. This is clearly because of the threshold nature of preferential flow as well as the threshold nature of Hortonian production of overland flow. It was shown furthermore that the spatial pattern of a key parameter (macroporosity) that determined threshold behavior is of vast importance for the model response. The estimation of these patterns, which is mostly done based on sparse observations and expert knowledge, is a major source for predictive model uncertainty. Finally, it was shown that the usage of biased, i.e. spatially homogenized precipitation, input during parameter estimation yields a biased model structure, which gives poor results when used with highly distributed input. If spatially highly resolved precipitation was used during model parameter estimation. the predictive uncertainty of the model was clearly reduced. (c) 2005 Elsevier B.V. All rights reserved Y1 - 2005 SN - 0022-1694 ER - TY - JOUR A1 - Schleger, C. A1 - Becker, Rolf A1 - Oesch, Franz A1 - Steinberg, Pablo T1 - The human p53 gene mutated at position 249 per se is not sufficient to immortalize human liver cells Y1 - 1999 ER - TY - JOUR A1 - Gräff, Thomas A1 - Zehe, Erwin A1 - Schläger, Stefan A1 - Morgner, Markus A1 - Bauer, Andreas A1 - Becker, Rolf A1 - Creutzfeldt, Benjamin A1 - Bronstert, Axel T1 - A quality assessment of spatial TDR soil moisture measurements in homogenous and heterogeneous media with laboratory experiments N2 - Investigation of transient soil moisture profiles yields valuable information of near- surface processes. A recently developed reconstruction algorithm based on the telegraph equation allows the inverse estimation of soil moisture profiles along coated, three rod TDR probes. Laboratory experiments were carried out to prove the results of the inversion and to understand the influence of probe rod deformation and solid objects close to the probe in heterogonous media. Differences in rod geometry can lead to serious misinterpretations in the soil moisture profile but have small influence on the average soil moisture along the probe. Solids in the integration volume have almost no effect on average soil moisture but result in locally slightly decreased moisture values. Inverted profiles obtained in a loamy soil with a clay content of about 16% were in good agreement with independent measurements. Y1 - 2010 UR - http://www.hydrol-earth-syst-sci-discuss.net/volumes_and_issues.html U6 - https://doi.org/10.5194/hessd-7-269-2010 SN - 1812-2108 ER - TY - JOUR A1 - Gräff, Thomas A1 - Zehe, Erwin A1 - Schlaeger, Stefan A1 - Morgner, Markus A1 - Bauer, Andreas A1 - Becker, Rolf A1 - Creutzfeldt, Benjamin A1 - Bronstert, Axel T1 - A quality assessment of Spatial TDR soil moisture measurements in homogenous and heterogeneous media with laboratory experiments N2 - Investigation of transient soil moisture profiles yields valuable information of near- surface processes. A recently developed reconstruction algorithm based on the telegraph equation allows the inverse estimation of soil moisture profiles along coated, three rod TDR probes. Laboratory experiments were carried out to prove the results of the inversion and to understand the influence of probe rod deformation and solid objects close to the probe in heterogeneous media. Differences in rod geometry can lead to serious misinterpretations in the soil moisture profile, but have small influence on the average soil moisture along the probe. Solids in the integration volume have almost no effect on average soil moisture, but result in locally slightly decreased moisture values. Inverted profiles obtained in a loamy soil with a clay content of about 16% were in good agreement with independent measurements. Y1 - 2010 UR - http://www.copernicus.org/EGU/hess/hess.html U6 - https://doi.org/10.5194/hess-14-1007-2010 SN - 1027-5606 ER - TY - JOUR A1 - Gregg, M. D. A1 - Schechter, P. A1 - Becker, Rolf A1 - Wisotzki, Lutz A1 - Maza, J. A1 - Laurent-Muehleisen, S. A1 - White, R. T1 - Two new high resolution surveys for lensed quasars Y1 - 2001 SN - 1-583-81074-9 ER - TY - JOUR A1 - Becker, Rolf A1 - Lauterbach, Wolfgang T1 - Bildung als Privileg - Ursachen, Mechanismen, Prozesse und Wirkungen Einleitung JF - Bildung als Privileg : Erklärungen und Befunde zu den Ursachen der Bildungsungleichheit N2 - Bildung ist eine der wichtigsten sozialen Fragen des 21. Jahrhunderts (Mayer 2000). Sie beschränkt sich nicht auf die allgemeine Schulbildung und formelle Berufsausbildung, sondern ebenso auf die Hochschulbildung (siehe den Beitrag von Müller und Pollak in diesem Band), berufliche Weiterbildung und das kontinuierliche selbstgesteuerte Lernen (siehe den Beitrag von Offerhaus, Leschke und Schömann). Y1 - 2016 SN - 978-3-658-11951-5 SN - 978-3-658-11952-2 U6 - https://doi.org/10.1007/978-3-658-11952-2_1 SP - 3 EP - 53 PB - Springer CY - Wiesbaden ER -