caa a22 4500 463163796 CHVBK 20180406164755.0 cr unu---uuuuu 170326e20070601xx s 000 0 eng 10.1007/s11242-006-9041-z doi (NATIONALLICENCE)springer-10.1007/s11242-006-9041-z Water flow between soil aggregates [Elektronische Daten] [A. Carminati, A. Kaestner, O. Ippisch, A. Koliji, P. Lehmann, R. Hassanein, P. Vontobel, E. Lehmann, L. Laloui, L. Vulliet, H. Flühler] Aggregated soils are structured systems susceptible to non-uniform flow. The hydraulic properties depend on the aggregate fabric and the way the aggregates are assembled. We examined the hydraulic behavior of an aggregate packing. We focused on conditions when water mostly flows through the aggregates, leaving the inter-aggregate pore space air-filled. The aggregates were packed in 3mm thick slabs forming a quasi two-dimensional bedding. The larger aggregates were wetted with water and embedded in smaller aggregates equilibrated at a lower water content. The water exchange between wet and drier aggregates was monitored by neutron radiography. The three-dimensional arrangement of the aggregates was reconstructed by neutron tomography. The water flow turned out to be controlled by the contacts between aggregates, bottle-necks that slow down the flow. The bottle-neck effect is due to the narrow flow cross section of the contacts. The water exchange was simulated by considering the contact area between aggregates as the key parameter. In order to match the observed water flow, the contact area must be reduced by one to two orders of magnitude relative to that obtained from image analysis. The narrowness of the contacts is due to air-filled voids within the contacts. Springer Science+Business Media, Inc., 2006 Soil aggregates nationallicence Water exchange nationallicence Neutron radiography nationallicence Contact area nationallicence Carminati A. Institute for Terrestrial Ecosystems, ETH, Zürich, Switzerland aut Kaestner A. Institute for Terrestrial Ecosystems, ETH, Zürich, Switzerland aut Ippisch O. Interdisciplinary Center for Scientific Computing, University of Heidelberg, Mannheim, Germany aut Koliji A. Soil Mechanics Laboratory, EPFL, Lausanne, Switzerland aut Lehmann P. Laboratory of Soil and Environmental Physics, EPFL, Lausanne, Switzerland aut Hassanein R. Spallation Neutron Source Division ASQ, Paul Scherrer Institute, Villigen, Switzerland aut Vontobel P. Spallation Neutron Source Division ASQ, Paul Scherrer Institute, Villigen, Switzerland aut Lehmann E. Spallation Neutron Source Division ASQ, Paul Scherrer Institute, Villigen, Switzerland aut Laloui L. Soil Mechanics Laboratory, EPFL, Lausanne, Switzerland aut Vulliet L. Soil Mechanics Laboratory, EPFL, Lausanne, Switzerland aut Flühler H. Institute for Terrestrial Ecosystems, ETH, Zürich, Switzerland aut Transport in Porous Media Kluwer Academic Publishers 68/2(2007-06-01), 219-236 0169-3913 68:2<219 2007 68 11242 https://doi.org/10.1007/s11242-006-9041-z text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s11242-006-9041-z text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Carminati A. Institute for Terrestrial Ecosystems, ETH, Zürich, Switzerland aut NATIONALLICENCE 700 1- Kaestner A. Institute for Terrestrial Ecosystems, ETH, Zürich, Switzerland aut NATIONALLICENCE 700 1- Ippisch O. Interdisciplinary Center for Scientific Computing, University of Heidelberg, Mannheim, Germany aut NATIONALLICENCE 700 1- Koliji A. Soil Mechanics Laboratory, EPFL, Lausanne, Switzerland aut NATIONALLICENCE 700 1- Lehmann P. Laboratory of Soil and Environmental Physics, EPFL, Lausanne, Switzerland aut NATIONALLICENCE 700 1- Hassanein R. Spallation Neutron Source Division ASQ, Paul Scherrer Institute, Villigen, Switzerland aut NATIONALLICENCE 700 1- Vontobel P. Spallation Neutron Source Division ASQ, Paul Scherrer Institute, Villigen, Switzerland aut NATIONALLICENCE 700 1- Lehmann E. Spallation Neutron Source Division ASQ, Paul Scherrer Institute, Villigen, Switzerland aut NATIONALLICENCE 700 1- Laloui L. Soil Mechanics Laboratory, EPFL, Lausanne, Switzerland aut NATIONALLICENCE 700 1- Vulliet L. Soil Mechanics Laboratory, EPFL, Lausanne, Switzerland aut NATIONALLICENCE 700 1- Flühler H. Institute for Terrestrial Ecosystems, ETH, Zürich, Switzerland aut NATIONALLICENCE 773 0- Transport in Porous Media Kluwer Academic Publishers 68/2(2007-06-01), 219-236 0169-3913 68:2<219 2007 68 11242 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer