Zobrazeno 1 - 10
of 779
pro vyhledávání: '"Knabner P."'
Publikováno v:
Analele Stiintifice ale Universitatii Ovidius Constanta: Seria Matematica, Vol 23, Iss 3, Pp 187-208 (2015)
Concentrations of chemical species transported in random environments need to be statistically characterized by probability density functions (PDF). Solutions to evolution equations for the one-point one-time PDF are usually based on systems of compu
Externí odkaz:
https://doaj.org/article/1da427922e214576bcb3f2a8d35fc816
Publikováno v:
Analele Stiintifice ale Universitatii Ovidius Constanta: Seria Matematica, Vol 23, Iss 3, Pp 167-186 (2015)
Transport processes in groundwater systems with spatially heterogeneous properties often exhibit anomalous behavior. Using first-order approximations in velocity fluctuations we show that anomalous superdiffusive behavior may result if velocity field
Externí odkaz:
https://doaj.org/article/f22f0a812c9d463f9b570ba0b80db838
The paper presents error estimates within a unified abstract framework for the analysis of FEM for boundary value problems with linear diffusion-convection-reaction equations and boundary conditions of mixed type. Since neither conformity nor consist
Externí odkaz:
http://arxiv.org/abs/2301.06860
Two-scale models pose a promising approach in simulating reactive flow and transport in evolving porous media. Classically, homogenized flow and transport equations are solved on the macroscopic scale, while effective parameters are obtained from aux
Externí odkaz:
http://arxiv.org/abs/2201.13265
Autor:
Noelia Garcia-Franco, Martin Wiesmeier, Vincent Buness, Bernd J. Berauer, Max A. Schuchardt, Anke Jentsch, Marcus Schlingmann, Diana Andrade-Linares, Benjamin Wolf, Ralf Kiese, Michael Dannenmann, Ingrid Kögel-Knabner
Publikováno v:
Geoderma, Vol 442, Iss , Pp 116807- (2024)
Mountainous grassland soils are considered one of the most unique biological hotspots, rich in organic carbon (OC). At the same time, they are exposed to great threats, as climate warming is more pronounced in mountainous regions than in lowland area
Externí odkaz:
https://doaj.org/article/9f908337a4d84699894aeda082ed40ba
Autor:
Metzger, Stefan, Knabner, Peter
Publikováno v:
Multiscale Modeling & Simulation 19 (2021), p. 320-343
We extend the two-scale expansion approach of periodic homogenization to include time scales and thus can tackle the full instationary Navier-Stokes-Cahn-Hilliard model at the pore scale as microscale. Time scale separation allows us to keep microsca
Externí odkaz:
http://arxiv.org/abs/2002.02531
Publikováno v:
Geoderma, Vol 439, Iss , Pp 116695- (2023)
Carbon sequestration in Plaggic Anthrosols is most often investigated by bulk soil carbon inventories, without considering the form in which the carbon is stored (e.g., particulate or mineral-associated organic matter (OM), its capacity, or its chemi
Externí odkaz:
https://doaj.org/article/9f108187fb5741d78b453dfe6491b3af
Autor:
Alecsa, Cristian D., Boros, Imre, Frank, Florian, Knabner, Peter, Nechita, Mihai, Prechtel, Alexander, Rupp, Andreas, Suciu, Nicolae
This article presents numerical investigations on accuracy and convergence properties of several numerical approaches for simulating steady state flows in heterogeneous aquifers. Finite difference, finite element, discontinuous Galerkin, spectral, an
Externí odkaz:
http://arxiv.org/abs/1911.10774
Autor:
Karen Vancampenhout, Alberto Agnelli, Jan Willem van Groeningen, David Laird, Budiman Minasny, Ingrid Kögel-Knabner
Publikováno v:
Geoderma, Vol 438, Iss , Pp 116642- (2023)
Externí odkaz:
https://doaj.org/article/3b0622f92cb84c869c6f506be996ba84
Autor:
Martina I. Gocke, Julien Guigue, Sara L. Bauke, Dietmar Barkusky, Michael Baumecker, Anne E. Berns, Eleanor Hobley, Bernd Honermeier, Ingrid Kögel-Knabner, Sylvia Koszinski, Alexandra Sandhage-Hofmann, Urs Schmidhalter, Florian Schneider, Kathlin Schweitzer, Sabine Seidel, Stefan Siebert, Laura E. Skadell, Michael Sommer, Sabine von Tucher, Axel Don, Wulf Amelung
Publikováno v:
Geoderma, Vol 438, Iss , Pp 116616- (2023)
Crop production often leads to soil organic carbon (SOC) losses. However, under good management practice it is possible to maintain and even re-accumulate SOC. We evaluated how different cropland management techniques affected SOC stocks in the topso
Externí odkaz:
https://doaj.org/article/e407c4d5b0044fb1acd182300f551a9b